Dirty Harry Wiki: Comment: Docker

Docker#

Resources#

docker options#

Install with apt-get install docker.io. Beware that you need a 64bit version OS !

root@athena:~# docker
Usage: docker [OPTIONS] COMMAND [arg...]
 -H=[unix:///var/run/docker.sock]: tcp://host:port to bind/connect to or unix://path/to/socket to use

A self-sufficient runtime for linux containers.

Commands:
    attach    Attach to a running container
    build     Build an image from a Dockerfile
    commit    Create a new image from a container's changes
    cp        Copy files/folders from the containers filesystem to the host path
    diff      Inspect changes on a container's filesystem
    events    Get real time events from the server
    export    Stream the contents of a container as a tar archive
    history   Show the history of an image
    images    List images
    import    Create a new filesystem image from the contents of a tarball
    info      Display system-wide information
    inspect   Return low-level information on a container
    kill      Kill a running container
    load      Load an image from a tar archive
    login     Register or Login to the docker registry server
    logs      Fetch the logs of a container
    port      Lookup the public-facing port which is NAT-ed to PRIVATE_PORT
    pause     Pause all processes within a container
    ps        List containers
    pull      Pull an image or a repository from the docker registry server
    push      Push an image or a repository to the docker registry server
    restart   Restart a running container
    rm        Remove one or more containers
    rmi       Remove one or more images
    run       Run a command in a new container
    save      Save an image to a tar archive
    search    Search for an image in the docker index
    start     Start a stopped container
    stop      Stop a running container
    tag       Tag an image into a repository
    top       Lookup the running processes of a container
    unpause   Unpause a paused container
    version   Show the docker version information
    wait      Block until a container stops, then print its exit code

root@athena:~#

run#

Then simply start a container with :

docker run -i -t ubuntu /bin/bash

This starts a container in interactive mode. The first time you run this, the image is downloaded from docker hub and stored locally.
When you exit the container, it is immediately "gone" too.

With docker ps you can see what is running:

root@athena:~# docker ps
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS               NAMES
9539bc7b78df        ubuntu-14.04:latest   /bin/bash           6 seconds ago       Up 5 seconds                            silly_darwin

Now, the funny thing is, you can do something in the container, like installing vim or openjdk-7-jdk, and then commit that (from outside the container) :

root@athena:~# docker commit -m "added java" -a "Harry Metske" e5acc9ff7c9c  ubuntu-14.04
feb996bac7c44edd0cfe28b54901f2ff500b4c18fed203931b703d14cc89b8c0

And after that you can see the results with docker images :

root@athena:~# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu-14.04        latest              feb996bac7c4        12 seconds ago      664.2 MB
ubuntu/1404         v1.0                9e7a0bc71946        42 minutes ago      311.2 MB
ubuntu              latest              5506de2b643b        6 days ago          199.3 MB

After that you can run that new container again (and have java installed) :

 docker run -h hostje -i -t --user=metskem feb996bac7c4

-h gives a hostname to the container (inside container)
-i -t ==> interactive mode
--user=metskem ==> start the shell with that user (that user must have been created earlier in the container)
feb996bac7c4 ==> the unique id of the just committed image

run with port mapping#

docker run -p 8080:80 -t -i dfda109aba4a /bin/bash

You can now access localhost:8080 on the host, this will be remapped to port 80 in the container.

history#

You can also list the history of images:

root@athena:~# docker history feb996bac7c4
IMAGE               CREATED             CREATED BY                                      SIZE
feb996bac7c4        41 minutes ago      /bin/bash                                       353 MB
9e7a0bc71946        About an hour ago   /bin/bash                                       112 MB
5506de2b643b        6 days ago          /bin/sh -c #(nop) CMD [/bin/bash]               0 B
22093c35d77b        6 days ago          /bin/sh -c apt-get update && apt-get dist-upg   6.558 MB
3680052c0f5c        6 days ago          /bin/sh -c sed -i 's/^#\s*\(deb.*universe\)$/   1.895 kB
e791be0477f2        6 days ago          /bin/sh -c rm -rf /var/lib/apt/lists/*          0 B
ccb62158e970        6 days ago          /bin/sh -c echo '#!/bin/sh' > /usr/sbin/polic   194.8 kB
d497ad3926c8        9 days ago          /bin/sh -c #(nop) ADD file:3996e886f2aa934dda   192.5 MB
511136ea3c5a        16 months ago                                                       0 B

Note that no daemons are started after starting the container. For example, installing openssh-server (and update-rc.d defaults) it is not started after running the container ==> find out, there must be other options

build images#

Create /var/lib/docker/docker/dockerfiles/testje/Dockerfile, cd to /var/lib/docker/docker/dockerfiles and create testje/Dockerfile with content :

FROM nginx
MAINTAINER Harry Metske <harry.metske@gmail.com>
RUN date > /tmp/date.txt
RUN apt-get -y install vim

There is Docker file Reference

and run

root@athena:/var/lib/docker/dockerfiles# docker build testje
Sending build context to Docker daemon  2.56 kB
Sending build context to Docker daemon 
Step 0 : FROM nginx
 ---> f1c42afeb4a4
Step 1 : MAINTAINER Harry Metske <harry.metske@gmail.com>
 ---> Using cache
 ---> 2db2a6377c41
Step 2 : RUN date > /tmp/date.txt
 ---> Using cache
 ---> d57d03dacc7f
Step 3 : RUN apt-get -y install vim
 ---> Using cache
 ---> e426018fc315
Successfully built e426018fc315

Another Dockerfile :

FROM nginx
MAINTAINER Harry Metske <harry.metske@gmail.com>
RUN apt-get -y install wget vim openssh-server openjdk-7-jre
RUN wget -O - http://apache.proserve.nl/tomcat/tomcat-8/v8.0.14/bin/apache-tomcat-8.0.14.tar.gz | gunzip | tar -x -C /usr/local
RUN cd /usr/local && ln -s apache-tomcat-8.0.14 tomcat
RUN rm -f /usr/local/tomcat/bin/*.bat
ADD filestoadd/tomcat-users.xml /usr/local/tomcat/conf/
CMD /bin/bash

More experiments#

Host preparations#

If you want to use data volumes, make sure you have the proper file context on the host datavolume directories (to prevent permission denied :

[root@vbox a]# semanage fcontext --add -t svirt_sandbox_file_t /var/jspwiki/a
[root@vbox a]# restorecon -vFr /var/jspwiki/a
restorecon reset /var/jspwiki/a context system_u:object_r:var_t:s0->system_u:object_r:svirt_sandbox_file_t:s0
[root@vbox a]# ls -lZ /var/jspwiki/
drwxrwxrwx. root root system_u:object_r:svirt_sandbox_file_t:s0 a

For the semanage command to become available, you might have to install it first with yum install policycoreutils-python .

Other stuff#

docker pull centos:7

[root@localhost ~]# docker pull centos:7
Pulling repository centos
dade6cb4530a: Download complete 
511136ea3c5a: Download complete 
5b12ef8fd570: Download complete 
Status: Downloaded newer image for centos:7

docker images

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos              7                   dade6cb4530a        2 weeks ago         224 MB
centos              centos7             dade6cb4530a        2 weeks ago         224 MB
centos              latest              dade6cb4530a        2 weeks ago         224 MB

Create a docker file first in ~/dockerfiles/java7/Dockerfile :

#
#  Dockerfile with OpenJDK7 on top of CentoS 7
#
FROM dade6cb4530a
MAINTAINER Harry Metske <harry.metske@gmail.com>
RUN yum -y install java-1.7.0-openjdk
CMD /bin/bash

docker build --tag=java7 --rm=true java7

[root@localhost dockerfiles]# docker build --tag=java7 --rm=true java7
Sending build context to Docker daemon  2.56 kB
Sending build context to Docker daemon 
Step 0 : FROM dade6cb4530a
 ---> dade6cb4530a
Step 1 : MAINTAINER Harry Metske <harry.metske@gmail.com>
 ---> Using cache
 ---> 359721211f5c
Step 2 : RUN yum -y install java-1.7.0-openjdk
 ---> Running in f21bde92b3d8
Loaded plugins: fastestmirror
Determining fastest mirrors
 * base: mirror.denit.net
 * extras: mirror.widexs.nl
 * updates: mirror.widexs.nl
Resolving Dependencies
--> Running transaction check
---> Package java-1.7.0-openjdk.x86_64 1:1.7.0.75-2.5.4.2.el7_0 will be installed

-------  a lot of yum output   --------
                              
  xorg-x11-fonts-Type1.noarch 0:7.5-9.el7                                       

Complete!
 ---> dee61328998e
Removing intermediate container f21bde92b3d8
Step 3 : CMD /bin/bash
 ---> Running in 45449ac928c8
 ---> e48c60e07bc1
Removing intermediate container 45449ac928c8
Successfully built e48c60e07bc1

docker images again:

[root@localhost dockerfiles]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
java7               latest              e48c60e07bc1        9 minutes ago       487.5 MB
centos              centos7             dade6cb4530a        2 weeks ago         224 MB
centos              latest              dade6cb4530a        2 weeks ago         224 MB
centos              7                   dade6cb4530a        2 weeks ago         224 MB

Now we have the first layer, CentOS with Java installed. On top of that we want tomcat installed and make that a new build again with the following Dockerfile :

#
#  Dockerfile for a running tomcat 8.0.18 on top OpenJDK7 on top of CentoS 7
#  Also install tar, needed for unpacking the tomcat archive.
#
FROM e48c60e07bc1
MAINTAINER Harry Metske <harry.metske@gmail.com>
RUN yum -y install tar
RUN curl http://apache.proserve.nl/tomcat/tomcat-8/v8.0.18/bin/apache-tomcat-8.0.18.tar.gz | gunzip | tar -x -C /usr/local
RUN cd /usr/local && ln -s apache-tomcat-8.0.18 tomcat
RUN rm -rf /usr/local/tomcat/bin/*.bat /usr/local/tomcat/webapps/examples /usr/local/tomcat/webapps/host-manager
# 
# by default we start the Tomcat container when the docker container is started.
CMD /usr/local/tomcat/bin/catalina.sh run

docker build --force-rm=true --tag=tomcat8 tomcat8

build an image

[root@localhost dockerfiles]# docker build --force-rm=true --tag=tomcat8 tomcat8
Sending build context to Docker daemon 3.072 kB
Sending build context to Docker daemon 
Step 0 : FROM e48c60e07bc1
 ---> e48c60e07bc1
Step 1 : MAINTAINER Harry Metske <harry.metske@gmail.com>
 ---> Running in af0b22f64d21
 ---> c63db74da65c
Removing intermediate container af0b22f64d21
Step 2 : RUN yum -y install tar
 ---> Running in feb87054efdd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.denit.net
 * extras: mirror.widexs.nl
 * updates: mirror.widexs.nl
Resolving Dependencies
--> Running transaction check
---> Package tar.x86_64 2:1.26-29.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

----- a lot of yum output  ----

Running transaction
  Installing : 2:tar-1.26-29.el7.x86_64                                     1/1 
  Verifying  : 2:tar-1.26-29.el7.x86_64                                     1/1 

Installed:
  tar.x86_64 2:1.26-29.el7                                                      

Complete!
 ---> 3b2d250a33dc
Removing intermediate container feb87054efdd
Step 3 : RUN curl http://apache.proserve.nl/tomcat/tomcat-8/v8.0.18/bin/apache-tomcat-8.0.18.tar.gz | gunzip | tar -x -C /usr/local
 ---> Running in 23ab3815b77e
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 9053k  100 9053k    0     0   610k      0  0:00:14  0:00:14 --:--:--  750k
 ---> e7f295ac6dc2
Removing intermediate container 23ab3815b77e
Step 4 : RUN cd /usr/local && ln -s apache-tomcat-8.0.18 tomcat
 ---> Running in 4b9e840d022d
 ---> be2444c2a7f1
Removing intermediate container 4b9e840d022d
Step 5 : RUN rm -f /usr/local/tomcat/bin/*.bat
 ---> Running in 4e3895b23dd7
 ---> 1690fcce7177
Removing intermediate container 4e3895b23dd7
Step 6 : CMD /usr/local/tomcat/bin/startup.sh
 ---> Running in baa7d280864e
 ---> f4af0b5bcc33
Removing intermediate container baa7d280864e
Successfully built f4af0b5bcc33

docker images again :

[root@localhost dockerfiles]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
tomcat8             latest              f4af0b5bcc33        2 minutes ago       515.1 MB
java7               latest              e48c60e07bc1        18 minutes ago      487.5 MB
<none>              <none>              c54971cf4c5c        34 minutes ago      502.7 MB
centos              7                   dade6cb4530a        2 weeks ago         224 MB
centos              centos7             dade6cb4530a        2 weeks ago         224 MB
centos              latest              dade6cb4530a        2 weeks ago         224 MB

(I made a few corrections to the dockerfile and rebuilt again, so the imageid has changed), but now we can run the container :

[root@localhost dockerfiles]# docker run -d 133f6647de58
ab3fcb88cb92d2136f8f9862176d129ad00cd121656fec7a0393b1873a45e2b4
[root@localhost dockerfiles]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS               NAMES
ab3fcb88cb92        tomcat8:latest      "/bin/sh -c '/usr/lo   4 seconds ago       Up 3 seconds                            clever_brattain

Now what is the IP address of this container , we can find that out by running a command in the already running container :

[root@localhost dockerfiles]# docker exec -t ab3fcb88cb92 ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
48: eth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 02:42:ac:11:00:18 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.24/16 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:acff:fe11:18/64 scope link 
       valid_lft forever preferred_lft forever

I cannot get to that IP address, so we stop the container and restart it with port mapping again :

[root@localhost ~]# docker stop ab3fcb88cb92
ab3fcb88cb92
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

[root@localhost ~]# docker run -d --publish=80:8080 133f6647de58
42aabfe7d36475eaa46fe84b65b0a62f628bc721d8b2feefdc06fcdcf7dc3949
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                  NAMES
42aabfe7d364        tomcat8:latest      "/bin/sh -c '/usr/lo   8 seconds ago       Up 7 seconds        0.0.0.0:80->8080/tcp   furious_fermat      
[root@localhost ~]#

Now we can run more of those containers :

[root@localhost ~]# docker run -d --publish=81:8080 133f6647de58
57ff21dc902d6ad0bb43b722e256d80d417adebbadbf03117363aa51f58b474c
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                  NAMES
57ff21dc902d        tomcat8:latest      "/bin/sh -c '/usr/lo   5 seconds ago       Up 4 seconds        0.0.0.0:81->8080/tcp   mad_babbage         
42aabfe7d364        tomcat8:latest      "/bin/sh -c '/usr/lo   5 minutes ago       Up 5 minutes        0.0.0.0:80->8080/tcp   furious_fermat      
[root@localhost ~]# docker run -d --publish=82:8080 133f6647de58
a126abaec6fb5cac39a7c832b11b290ce01d06d8ba5f01b14d344951316dab6e
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                  NAMES
a126abaec6fb        tomcat8:latest      "/bin/sh -c '/usr/lo   36 seconds ago      Up 35 seconds       0.0.0.0:82->8080/tcp   hopeful_blackwell   
57ff21dc902d        tomcat8:latest      "/bin/sh -c '/usr/lo   49 seconds ago      Up 48 seconds       0.0.0.0:81->8080/tcp   mad_babbage         
42aabfe7d364        tomcat8:latest      "/bin/sh -c '/usr/lo   5 minutes ago       Up 5 minutes        0.0.0.0:80->8080/tcp   furious_fermat      
[root@localhost ~]#

Cleaning up containers

Container cleanup

[root@vbox dockerfiles]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS                           PORTS               NAMES
294851829c28        f4af0b5bcc33        "/bin/bash"            About an hour ago   Exited (0) 59 minutes ago                            mad_pasteur             
78663028cc2c        f4af0b5bcc33        "/bin/sh -c /usr/loc   About an hour ago   Exited (0) About an hour ago                         elegant_kirch           
3ba4c33febdf        f4af0b5bcc33        "/bin/sh -c /usr/loc   About an hour ago   Exited (0) About an hour ago                         stoic_bohr              
f62ab5413811        java7:latest        "/bin/sh -c /bin/bas   About an hour ago   Exited (0) About an hour ago                         determined_kowalevski   
7b63e6229cb5        centos:7            "/bin/bash"            About an hour ago   Exited (1) About an hour ago                         suspicious_colden       
a854fcf6b129        centos:7            "/bin/bash"            About an hour ago   Exited (127) About an hour ago                       goofy_pare              
74fceed71f43        centos:7            "/bin/bash"            About an hour ago   Exited (-1) 5 seconds ago                            sleepy_heisenberg       
9f64f577b539        921b3c87dbfa        "/bin/sh -c 'wget -O   About an hour ago   Exited (127) About an hour ago                       jolly_franklin          
8225cac14ed2        359721211f5c        "/bin/sh -c 'apt-get   About an hour ago   Exited (127) About an hour ago                       insane_rosalind         
33a40d5ed490        centos:7            "/bin/bash"            2 hours ago         Exited (0) 2 hours ago                               stoic_nobel             
2cc4d23eefc9        centos:7            "/bin/bash"            2 hours ago         Exited (0) 2 hours ago                               evil_stallman           
[root@vbox dockerfiles]# du -cms /var/lib/docker/*
1	/var/lib/docker/containers
1459	/var/lib/docker/devicemapper
1	/var/lib/docker/execdriver
1	/var/lib/docker/graph
7	/var/lib/docker/init
1	/var/lib/docker/linkgraph.db
1	/var/lib/docker/repositories-devicemapper
0	/var/lib/docker/tmp
1	/var/lib/docker/trust
0	/var/lib/docker/volumes
1466	total
[root@vbox dockerfiles]# docker ps  -a -q
294851829c28
78663028cc2c
3ba4c33febdf
f62ab5413811
7b63e6229cb5
a854fcf6b129
74fceed71f43
9f64f577b539
8225cac14ed2
33a40d5ed490
2cc4d23eefc9
[root@vbox dockerfiles]# docker stop $(docker ps  -a -q)
294851829c28
78663028cc2c
3ba4c33febdf
f62ab5413811
7b63e6229cb5
a854fcf6b129
74fceed71f43
9f64f577b539
8225cac14ed2
33a40d5ed490
2cc4d23eefc9
[root@vbox dockerfiles]# docker rm $(docker ps  -a -q)
294851829c28
78663028cc2c
3ba4c33febdf
f62ab5413811
7b63e6229cb5
a854fcf6b129
74fceed71f43
9f64f577b539
8225cac14ed2
33a40d5ed490
2cc4d23eefc9
[root@vbox dockerfiles]# docker ps  -a 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@vbox dockerfiles]# 
[root@vbox dockerfiles]# du -cms /var/lib/docker/*
0	/var/lib/docker/containers
1156	/var/lib/docker/devicemapper
0	/var/lib/docker/execdriver
1	/var/lib/docker/graph
7	/var/lib/docker/init
1	/var/lib/docker/linkgraph.db
1	/var/lib/docker/repositories-devicemapper
0	/var/lib/docker/tmp
1	/var/lib/docker/trust
0	/var/lib/docker/volumes
1163	total

VOLUME usage

I added VOLUME /usr/local/tomcat/logs to the Dockerfile and build a new image.
When running an INSPECT you can see where the volume is mapped :

VOLUME usage

[root@vbox dockerfiles]# docker inspect c6abceb6a4a2
[{
    "AppArmorProfile": "",
    "Args": [
        "-c",
        "/usr/local/tomcat/bin/catalina.sh run"
    ],
    "Config": {
        "AttachStderr": false,
        "AttachStdin": false,
        "AttachStdout": false,
        "Cmd": [
            "/bin/sh",
            "-c",
            "/usr/local/tomcat/bin/catalina.sh run"
        ],
        "CpuShares": 0,
        "Cpuset": "",
        "Domainname": "",
        "Entrypoint": null,
        "Env": [
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
        ],
        "ExposedPorts": {
            "8080/tcp": {}
        },
        "Hostname": "c6abceb6a4a2",
        "Image": "81d236795c31",
        "Memory": 268435456,
        "MemorySwap": 0,
        "NetworkDisabled": false,
        "OnBuild": null,
        "OpenStdin": false,
        "PortSpecs": null,
        "StdinOnce": false,
        "Tty": false,
        "User": "tomcat",
        "Volumes": {
            "/usr/local/tomcat/logs": {}
        },
        "WorkingDir": ""
    },
    "Created": "2015-02-25T18:35:54.49438532Z",
    "Driver": "devicemapper",
    "ExecDriver": "native-0.2",
    "HostConfig": {
        "Binds": null,
        "CapAdd": null,
        "CapDrop": null,
        "ContainerIDFile": "",
        "Devices": [],
        "Dns": null,
        "DnsSearch": null,
        "ExtraHosts": null,
        "Links": null,
        "LxcConf": [],
        "NetworkMode": "bridge",
        "PortBindings": {
            "8080/tcp": [
                {
                    "HostIp": "",
                    "HostPort": "80"
                }
            ]
        },
        "Privileged": false,
        "PublishAllPorts": false,
        "RestartPolicy": {
            "MaximumRetryCount": 0,
            "Name": ""
        },
        "SecurityOpt": null,
        "VolumesFrom": null
    },
    "HostnamePath": "/var/lib/docker/containers/c6abceb6a4a2e8b65e8ba1abf9eb89a7b1dfb6514a8b168fbf8d3cda48eb4d35/hostname",
    "HostsPath": "/var/lib/docker/containers/c6abceb6a4a2e8b65e8ba1abf9eb89a7b1dfb6514a8b168fbf8d3cda48eb4d35/hosts",
    "Id": "c6abceb6a4a2e8b65e8ba1abf9eb89a7b1dfb6514a8b168fbf8d3cda48eb4d35",
    "Image": "81d236795c31d782a2ea81f73af1b33736ef279430c0815f008525233e22c77d",
    "MountLabel": "system_u:object_r:svirt_sandbox_file_t:s0:c936,c992",
    "Name": "/naughty_ritchie",
    "NetworkSettings": {
        "Bridge": "docker0",
        "Gateway": "172.17.42.1",
        "IPAddress": "172.17.0.4",
        "IPPrefixLen": 16,
        "MacAddress": "02:42:ac:11:00:04",
        "PortMapping": null,
        "Ports": {
            "8080/tcp": [
                {
                    "HostIp": "0.0.0.0",
                    "HostPort": "80"
                }
            ]
        }
    },
    "Path": "/bin/sh",
    "ProcessLabel": "system_u:system_r:svirt_lxc_net_t:s0:c936,c992",
    "ResolvConfPath": "/var/lib/docker/containers/c6abceb6a4a2e8b65e8ba1abf9eb89a7b1dfb6514a8b168fbf8d3cda48eb4d35/resolv.conf",
    "State": {
        "ExitCode": 0,
        "FinishedAt": "0001-01-01T00:00:00Z",
        "Paused": false,
        "Pid": 2899,
        "Restarting": false,
        "Running": true,
        "StartedAt": "2015-02-25T18:35:55.099027392Z"
    },
    "Volumes": {
        "/usr/local/tomcat/logs": "/var/lib/docker/vfs/dir/e93bf55338e0c40ef4480af00db9924999e5fcb8fc86f5885b76b32eff4207c8"
    },
    "VolumesRW": {
        "/usr/local/tomcat/logs": true
    }
}

After stopping the container and removing it (docker stop and docker rm), the logoutput is still there :

Persistent data in VOLUMES still there

[root@vbox dockerfiles]# docker stop c6abceb6a4a2
c6abceb6a4a2
[root@vbox dockerfiles]# docker rm c6abceb6a4a2
c6abceb6a4a2
[root@vbox dir]# ls -l /var/lib/docker/vfs/dir/e93bf55338e0c40ef4480af00db9924999e5fcb8fc86f5885b76b32eff4207c8
total 20
-rw-r--r--. 1 centos centos  6173 25 feb 19:47 catalina.2015-02-25.log
-rw-r--r--. 1 centos centos     0 25 feb 19:35 host-manager.2015-02-25.log
-rw-r--r--. 1 centos centos     0 25 feb 19:35 localhost.2015-02-25.log
-rw-r--r--. 1 centos centos 10586 25 feb 19:39 localhost_access_log.2015-02-25.txt
-rw-r--r--. 1 centos centos     0 25 feb 19:35 manager.2015-02-25.log
[root@vbox dir]#

Now create a JSPWiki docker image, with the following Dockerfile :

JSPWiki Dockerfile

#
#  Dockerfile for  JSPWiki running in a tomcat 8.0.18 on top of OpenJDK7 on top of CentoS 7
#  Also install tar, needed for unpacking the tomcat archive.
#
FROM 81d236795c31
MAINTAINER Harry Metske <harry.metske@gmail.com>
# we need the unzip command to unpack the war and zip files
USER root
RUN yum install -y unzip
#
USER tomcat
# download the war from a fixed download location, create JSPWiki webapps dir, unzip it there.
RUN mkdir /usr/local/tomcat/webapps/JSPWiki
RUN TF=/tmp/jspwiki.download.war && curl --silent http://apache.xl-mirror.nl/jspwiki/2.10.1/binaries/JSPWiki.war > $TF && unzip -q -d /usr/local/tomcat/webapps/JSPWiki $TF && rm $TF
#
# download the default set of pages
RUN mkdir ~/jspwiki-files && TF=/tmp/jspwikipages-download.zip && curl --silent http://apache.xl-mirror.nl/jspwiki/2.10.1/wikipages/jspwiki-wikipages-en-2.10.1.zip > $TF && unzip -q -d /tmp $TF && mv /tmp/jspwiki-wikipages-en-2.10.1/*  ~/jspwiki-files && rm -r $TF /tmp/jspwiki-wikipages-en-2.10.1
# 
# by default we start the Tomcat container when the docker container is started.
CMD /usr/local/tomcat/bin/catalina.sh run

saving and loading images

You can save an image to a tar file and then import on another docker host :

REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
harry               jspwiki-2.10.1      14e51483a5c3        22 hours ago        597.8 MB
harry               tomcat8             81d236795c31        24 hours ago        528.6 MB
harry               java7               e48c60e07bc1        3 days ago          487.5 MB
centos              latest              dade6cb4530a        2 weeks ago         224 MB
centos              7                   dade6cb4530a        2 weeks ago         224 MB
centos              centos7             dade6cb4530a        2 weeks ago         224 MB
[root@vbox dockerfiles]# docker save 14e51483a5c3 > /tmp/container-14e51483a5c3.tar

scp this file to another host and then over there :

metskem@athena:/tmp$ cat container-14e51483a5c3.tar | docker load
metskem@athena:/tmp$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
<none>              <none>              14e51483a5c3        22 hours ago        597.8 MB
dockerfile/nginx    latest              05f647ea7662        5 days ago          425.7 MB
<none>              <none>              e430b8e3e2a5        6 days ago          273.8 MB
ubuntu              latest              5506de2b643b        4 months ago        199.3 MB
metskem@athena:/tmp$ docker run -d --publish=80:8080 14e51483a5c3
1da98fa35664b6cf82e5b82b31bd5069ef96e4ad2748c088a86c8a4572bb6f0c

Linking containers together

You can link a container to another running container by using the RUN --link <name>:<alias> option.
The envvars from the target container then are visible in the source container (potential security issue, don't put sensitive data in envvars in the tgt container) .
See the following, first we start a jspwiki container (and expose port 8080) :

[metskem@vbox docker]$ docker run -d --name wiki --env="jspwiki.baseURL=http://10.0.0.195:8080" --expose=8080 harry:jspwiki-2.10.2-svn-14
ff1e7ec53f0bede9932406826939498ed526bafd6145486d61603c0041d27747
[metskem@vbox docker]$ docker ps
CONTAINER ID        IMAGE                         COMMAND                CREATED             STATUS              PORTS               NAMES
ff1e7ec53f0b        harry:jspwiki-2.10.2-svn-14   "/bin/sh -c '/usr/lo   26 seconds ago      Up 24 seconds       8080/tcp            wiki                
[metskem@vbox docker]$

Secondly we start another container that links to the wiki container:

[metskem@vbox ~]$ docker run -ti --link wiki:alias2wiki centos:centos7 bash
[root@f959f7929aae /]# env|sort
ALIAS2WIKI_ENV_jspwiki.baseURL=http://10.0.0.195:8080
ALIAS2WIKI_ENV_jspwiki.basicAttachmentProvider.storageDir=/var/jspwiki/pages
ALIAS2WIKI_ENV_jspwiki.fileSystemProvider.pageDir=/var/jspwiki/pages
ALIAS2WIKI_ENV_jspwiki.pageProvider=VersioningFileProvider
ALIAS2WIKI_ENV_jspwiki.workDir=/var/jspwiki/work
ALIAS2WIKI_ENV_jspwiki.xmlGroupDatabaseFile=/var/jspwiki/etc/groupdatabase.xml
ALIAS2WIKI_ENV_jspwiki.xmlUserDatabaseFile=/var/jspwiki/etc/userdatabase.xml
ALIAS2WIKI_NAME=/thirsty_darwin/alias2wiki
ALIAS2WIKI_PORT=tcp://172.17.0.15:8080
ALIAS2WIKI_PORT_8080_TCP=tcp://172.17.0.15:8080
ALIAS2WIKI_PORT_8080_TCP_ADDR=172.17.0.15
ALIAS2WIKI_PORT_8080_TCP_PORT=8080
ALIAS2WIKI_PORT_8080_TCP_PROTO=tcp
HOME=/root
HOSTNAME=f959f7929aae
<< snip >>

Now you can see the envvars from the wiki container in the centos container, prefixed with <aliasname>_ENV_ .

Upgrading to 1.5 and more tweaks#

Instructions

backup current images:
for IM in `docker images -q|sort -u`; do echo saving $IM;docker save $IM > /tmp/$IM.tar ; done
cd /root/docker/downloads
rpm -e docker
curl --silent https://get.docker.com/builds/Linux/x86_64/docker-latest > docker
chmod +x docker
docker --version
cp ~/docker/downloads/docker /usr/bin
copy 2 unit files from https://github.com/docker/docker/tree/master/contrib/init/systemd to /etc/systemd/system
sudo systemctl enable docker.service

Another issue with AUFS is that you cannot install httpd (example)

error: unpacking of archive failed on file /usr/sbin/suexec: cpio: cap_set_file

The solution is to run with devicemapper, so edit your /etc/default/docker and set

DOCKER_OPTS="-s devicemapper"

So save all your images with the docker save command restart the docker daemon and restore all images with the docker load command :

docker save `docker images -q` > ~/docker-images-all.tar
sudo service docker restart
cat ~/docker-images-all.tar | docker load

And, after that you have to retag all your images and remove the /var/lib/docker/aufs directory .

Running your own registry#

You probably need a central place to store and distribute your images. The docker public repository is sometimes a bit "too central" and you want to run your won registry somewhere in your own datacenter.

For general documentation see https://github.com/docker/docker-registry/.
First install the docker-registry image with docker pull registry.

Or go to this docker registry page, for how to install and run your own registry.

Then you have to retag your image before you can send it to your local registry :

docker tag harry:jspwiki-2.10.2-svn-14 10.0.0.195:5000/metskem/jspwiki:2.10.2-svn-14

And before you can push, you have to modify the arguments of the docker daemon. In my case it is in /etc/systemd/system/docker.service :

ExecStart=/usr/bin/docker --daemon --insecure-registry=10.0.0.195:5000 -H fd://

Followed by a

systemctl daemon-reload
systemctl restart docker

Then the actual push :

pushing to local registry

[metskem@vbox system]$ docker push 10.0.0.195:5000/metskem/jspwiki:2.10.2-svn-14
The push refers to a repository [10.0.0.195:5000/metskem/jspwiki] (len: 1)
Sending image list
Pushing repository 10.0.0.195:5000/metskem/jspwiki (1 tags)
511136ea3c5a: Image successfully pushed 
5b12ef8fd570: Image successfully pushed 
dade6cb4530a: Image successfully pushed 
359721211f5c: Image successfully pushed 
98beb40b6504: Image successfully pushed 
fad8a5aad415: Image successfully pushed 
c5eb18fad024: Image successfully pushed 
b454f7f76947: Image successfully pushed 
a0e7ab13f41d: Image successfully pushed 
2dc77cfd261e: Image successfully pushed 
a21d9f3f4938: Image successfully pushed 
7e99f3d52e90: Image successfully pushed 
f4feb8f23da5: Image successfully pushed 
c66f1b045bd0: Image successfully pushed 
04e2170f152e: Image successfully pushed 
679107dfd59a: Image successfully pushed 
64c35add867a: Image successfully pushed 
a1a54333a532: Image successfully pushed 
eaf42bb4a4da: Image successfully pushed 
7c14d4420bb2: Image successfully pushed 
da0330415812: Image successfully pushed 
62f598132165: Image successfully pushed 
acf1f70d0d41: Image successfully pushed 
e1c301a21dae: Image successfully pushed 
81181bc94763: Image successfully pushed 
3475c657c51b: Image successfully pushed 
7a26e9db5921: Image successfully pushed 
a6167bad8bc2: Image successfully pushed 
96ce60f733f1: Image successfully pushed 
1ff51e43d8fa: Image successfully pushed 
a488f594ffcd: Image successfully pushed 
e2700e924062: Image successfully pushed 
65858638c162: Image successfully pushed 
70cd6c38f806: Image successfully pushed 
770aaa29b831: Image successfully pushed 
5118b9f70abc: Image successfully pushed 
12d78307ddcd: Image successfully pushed 
badeb5836316: Image successfully pushed 
1402803586b7: Image successfully pushed 
3c1489a3cf9b: Image successfully pushed 
4531617a5dbb: Image successfully pushed 
00c67b76b331: Image successfully pushed 
Pushing tag for rev [00c67b76b331] on {http://10.0.0.195:5000/v1/repositories/metskem/jspwiki/tags/2.10.2-svn-14}

BUT, what about authentication and authorization ?! ==> probably configurable...

registry-ui

There is a web-pplication that allows you to view/edit registries and images. And of course that is also a docker container again , run it with :

docker run -p 8080:8080 --name=registry-ui atcol/docker-registry-ui

I added the registry I just started , you do have to use an IP address that is accessible from the registry-ui container.

Docker for JSPWiki#

I dedicated a separate page for that.

Pushing an image to the hub#

If you want to make your image public, first tag it and then push it:

[root@vbox ~]# docker tag harry:jspwiki-2.10.2-svn-14 registry.hub.docker.com/metskem/jspwiki:2.10.2-svn-14
[root@vbox ~]# docker images
REPOSITORY                                TAG                     IMAGE ID            CREATED             VIRTUAL SIZE
harry                                     jspwiki-2.10.2-svn-14   3e33f5d2d612        43 hours ago        618.3 MB
registry.hub.docker.com/metskem/jspwiki   2.10.2-svn-14           3e33f5d2d612        43 hours ago        618.3 MB
harry                                     tomcat-8.0.20           d9e7a3a95230        43 hours ago        542.7 MB
harry                                     java7                   c5eb18fad024        9 days ago          501.5 MB
centos                                    centos7                 dade6cb4530a        4 weeks ago         224 MB
centos                                    latest                  dade6cb4530a        4 weeks ago         224 MB
centos                                    7                       dade6cb4530a        4 weeks ago         224 MB
[root@vbox ~]# docker push registry.hub.docker.com/metskem/jspwiki:2.10.2-svn-14
The push refers to a repository [registry.hub.docker.com/metskem/jspwiki] (len: 1)
Sending image list

Please login prior to push:
Username: metskem
Password: 
Email: metskem@apache.org
Login Succeeded
The push refers to a repository [registry.hub.docker.com/metskem/jspwiki] (len: 1)
Sending image list
Pushing repository registry.hub.docker.com/metskem/jspwiki (1 tags)
511136ea3c5a: Image already pushed, skipping 
5b12ef8fd570: Image already pushed, skipping 
dade6cb4530a: Image already pushed, skipping 
359721211f5c: Image successfully pushed 
98beb40b6504: Image successfully pushed 
fad8a5aad415: Image successfully pushed 
<<<<  snip >>>>>>>
95ef590ff04d: Image successfully pushed 
3e33f5d2d612: Image successfully pushed 
Pushing tag for rev [3e33f5d2d612] on {https://cdn-registry-1.docker.io/v1/repositories/metskem/jspwiki/tags/2.10.2-svn-14}

TODO #

https://serfdom.io/

Docker (management) tools#

Panamax#

███████╗ ██████╗  █████████╗ ██████╗  ██████████╗ ██████╗  ██╗  ██╗
██╔══██║  ╚═══██╗ ███╗  ███║  ╚═══██╗ ██║ ██╔ ██║  ╚═══██╗ ╚██╗██╔╝
██   ██║ ███████║ ███║  ███║ ███████║ ██║╚██║ ██║ ███████║  ╚███╔╝ 
███████╝ ███████║ ███║  ███║ ███████║ ██║╚██║ ██║ ███████║  ██╔██╗ 
██║      ███████║ ███║  ███║ ███████║ ██║╚██║ ██║ ███████║ ██╔╝ ██╗
╚═╝      ╚══════╝ ╚══╝  ╚══╝ ╚══════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝ ╚═╝  ╚═╝

CenturyLink Labs - http://www.centurylinklabs.com/

Checking if required software is installed.

Vagrant 1.6 or newer installed.
Virtualbox 4.3 or newer installed.


Creating a new CoreOS VM...
UUID changed to: db487bd4-a551-438c-ac36-86ce9bafac9a
Bringing machine 'panamax-vm' up with 'virtualbox' provider...
==> panamax-vm: Importing base box 'panamax-coreos-box-522.6.0'...
==> panamax-vm: Matching MAC address for NAT networking...
==> panamax-vm: Setting the name of the VM: panamax-vm
==> panamax-vm: Clearing any previously set network interfaces...
The specified host network collides with a non-hostonly network!
This will cause your specified IP to be inaccessible. Please change
the IP or name of your host only network so that it no longer matches that of
a bridged or non-hostonly network.
VM Creation failed. Exiting.
metskem@athena:~$

Openshift 3#

Resources#

Docs

Installation#

There is an all-in-one Docker container for it, just run :

docker run

metskem@athena:~$ docker run -d --name=openshift --net=host --privileged -v /var/run/docker.sock:/var/run/docker.sock  openshift/origin start
00f2418d2f45f0ce6d69b220c1d208f80f098fe6a63f17dfd529586b9eeb3036
metskem@athena:~$ docker logs -f openshift
I0406 08:58:51.662636       1 start_allinone.go:181] Starting an OpenShift all-in-one
I0406 08:59:17.176061       1 start_master.go:274] Starting an OpenShift master, reachable at 0.0.0.0:8443 (etcd: [https://10.0.0.164:4001])
I0406 08:59:17.176094       1 start_master.go:275] OpenShift master public address is https://10.0.0.164:8443
I0406 08:59:17.176152       1 etcd.go:47] Started etcd at 10.0.0.164:4001
[etcd] Apr  6 08:59:18.196 INFO      | openshift.local is starting a new cluster
[etcd] Apr  6 08:59:18.197 INFO      | etcd server [name openshift.local, listen on 0.0.0.0:4001, advertised url https://10.0.0.164:4001]
[etcd] Apr  6 08:59:18.197 INFO      | peer server [name openshift.local, listen on 0.0.0.0:7001, advertised url https://10.0.0.164:7001]
[etcd] Apr  6 08:59:18.198 INFO      | openshift.local starting in peer mode
[etcd] Apr  6 08:59:18.198 INFO      | openshift.local: state changed from 'initialized' to 'follower'.
[etcd] Apr  6 08:59:18.198 INFO      | openshift.local: state changed from 'follower' to 'leader'.
[etcd] Apr  6 08:59:18.198 INFO      | openshift.local: leader changed from '' to 'openshift.local'.
I0406 08:59:19.820209       1 start_master.go:317] Static Nodes: [athena]
E0406 08:59:20.181728       1 reflector.go:115] Failed to list *api.ResourceQuota: Get https://10.0.0.164:8443/api/v1beta1/resourceQuotas?namespace=: dial tcp 10.0.0.164:8443: connection refused
E0406 08:59:20.181780       1 reflector.go:115] Failed to list *api.LimitRange: Get https://10.0.0.164:8443/api/v1beta1/limitRanges?namespace=: dial tcp 10.0.0.164:8443: connection refused
[restful] 2015/04/06 08:59:20 log.go:30: [restful/swagger] listing is available at /swaggerapi/
[restful] 2015/04/06 08:59:20 log.go:30: [restful/swagger] Swagger(File)Path is empty ; no UI is served
I0406 08:59:20.938037       1 master.go:431] Started Kubernetes API at 0.0.0.0:8443/api/v1beta1
I0406 08:59:20.938069       1 master.go:431] Started Kubernetes API at 0.0.0.0:8443/api/v1beta2
I0406 08:59:20.938078       1 master.go:431] Started Kubernetes API at 0.0.0.0:8443/api/v1beta3 (experimental)
I0406 08:59:20.938086       1 master.go:431] Started OpenShift API at 0.0.0.0:8443/osapi/v1beta1
I0406 08:59:20.938095       1 master.go:431] Started OAuth2 API at 0.0.0.0:8443/oauth
I0406 08:59:20.938103       1 master.go:431] Started login server at 0.0.0.0:8443/login
I0406 08:59:20.938112       1 master.go:431] Started OpenShift UI 0.0.0.0:8443/console/
I0406 08:59:20.938120       1 master.go:431] Started Swagger Schema API at 0.0.0.0:8443/swaggerapi/
E0406 08:59:21.215538       1 reflector.go:115] Failed to list *api.LimitRange: Get https://10.0.0.164:8443/api/v1beta1/limitRanges?namespace=: dial tcp 10.0.0.164:8443: connection refused
E0406 08:59:21.215653       1 reflector.go:115] Failed to list *api.ResourceQuota: Get https://10.0.0.164:8443/api/v1beta1/resourceQuotas?namespace=: dial tcp 10.0.0.164:8443: connection refused
I0406 08:59:21.345234       1 master.go:488] No master policy found.  Creating bootstrap policy based on: openshift.local.policy/policy.json
I0406 08:59:21.643400       1 master.go:109] Started Kubernetes Scheduler
I0406 08:59:21.643424       1 master.go:90] Started Kubernetes Replication Manager
I0406 08:59:21.643433       1 master.go:98] Started Kubernetes Endpoint Controller
I0406 08:59:22.770614       1 nodecontroller.go:189] Registered node in registry: athena
I0406 08:59:22.770636       1 nodecontroller.go:194] Successfully registered all nodes
I0406 08:59:22.770645       1 master.go:133] Started Kubernetes Minion Controller
I0406 08:59:22.770724       1 start_master.go:351] Using images from "openshift/origin-<component>:v0.4.2"
W0406 08:59:22.770868       1 master.go:601] Could not start DNS: listen tcp 0.0.0.0:53: bind: address already in use
E0406 08:59:23.338955       1 nodecontroller.go:279] Can't collect information for node athena: Get https://athena:10250/api/v1beta1/nodeInfo: dial tcp 127.0.1.1:10250: connection refused
I0406 08:59:31.454306       1 start_node.go:189] Starting an OpenShift node, connecting to https://10.0.0.164:8443
W0406 08:59:31.752616       1 node.go:91] Error running 'chcon' to set the kubelet volume root directory SELinux context: exit status 1
I0406 08:59:31.753905       1 node.go:61] Connecting to Docker at unix:///var/run/docker.sock
I0406 08:59:31.754512       1 proxier.go:328] Setting Proxy IP to 10.0.0.164
I0406 08:59:31.754534       1 proxier.go:333] Initializing iptables
I0406 08:59:31.815591       1 node.go:233] Started Kubernetes Proxy on 0.0.0.0
I0406 08:59:31.815729       1 manager.go:103] cAdvisor running in container: "/docker/00f2418d2f45f0ce6d69b220c1d208f80f098fe6a63f17dfd529586b9eeb3036"
I0406 08:59:31.816218       1 fs.go:87] Filesystem partitions: map[/dev/disk/by-uuid/5bbd6a91-bc46-4eb8-85f7-859dab4be488:{mountpoint:/etc/resolv.conf major:8 minor:6}]
I0406 08:59:31.818789       1 machine.go:223] Couldn't collect info from any of the files in "/etc/machine-id,/var/lib/dbus/machine-id"
I0406 08:59:31.818841       1 manager.go:124] Machine: {NumCores:4 CpuFrequency:1701000 MemoryCapacity:3834273792 MachineID: SystemUUID:609A7519-D21D-B211-8000-C930BF194D9E BootID:3c399cdc-65ba-4445-b488-1afd7505d8dc Filesystems:[{Device:/dev/disk/by-uuid/5bbd6a91-bc46-4eb8-85f7-859dab4be488 Capacity:59727097856}] DiskMap:map[8:0:{Name:sda Major:8 Minor:0 Size:128035676160 Scheduler:deadline}] NetworkDevices:[{Name:eth0 MacAddress:e8:03:9a:e8:75:86 Speed:10 Mtu:1500} {Name:vboxnet0 MacAddress:0a:00:27:00:00:00 Speed:0 Mtu:1500} {Name:wlan0 MacAddress:c4:85:08:52:76:78 Speed:0 Mtu:1500}] Topology:[{Id:0 Memory:3834273792 Cores:[{Id:0 Threads:[0 1] Caches:[{Size:32768 Type:Data Level:1} {Size:32768 Type:Instruction Level:1} {Size:262144 Type:Unified Level:2}]} {Id:1 Threads:[2 3] Caches:[{Size:32768 Type:Data Level:1} {Size:32768 Type:Instruction Level:1} {Size:262144 Type:Unified Level:2}]}] Caches:[{Size:3145728 Type:Unified Level:3}]}]}
I0406 08:59:31.853574       1 manager.go:131] Version: {KernelVersion:3.13.0-40-generic ContainerOsVersion:CentOS Linux 7 (Core) DockerVersion:1.5.0 CadvisorVersion:0.10.1}
I0406 08:59:31.934820       1 proxier.go:566] Opened iptables from-containers portal for service "default/kubernetes" on TCP 172.30.17.2:443
I0406 08:59:31.949718       1 proxier.go:577] Opened iptables from-host portal for service "default/kubernetes" on TCP 172.30.17.2:443
I0406 08:59:31.964394       1 proxier.go:566] Opened iptables from-containers portal for service "default/kubernetes-ro" on TCP 172.30.17.1:80
I0406 08:59:31.983399       1 proxier.go:577] Opened iptables from-host portal for service "default/kubernetes-ro" on TCP 172.30.17.1:80
E0406 08:59:31.984679       1 manager.go:138] Docker container factory registration failed: failed to get cgroup subsystems: failed to find cgroup mounts.
E0406 08:59:31.985329       1 manager.go:144] Registration of the raw container factory failed: failed to get cgroup subsystems: failed to find cgroup mounts
I0406 08:59:31.985391       1 manager.go:865] Started watching for new ooms in manager
E0406 08:59:31.985560       1 manager.go:196] Failed to start OOM watcher, will not get OOM events: neither /var/log/messages nor /var/log/syslog exists from which to read kernel errors
I0406 08:59:32.278897       1 node.go:176] Started Kubelet for node athena, server at 0.0.0.0:10250, tls=true
I0406 08:59:32.278926       1 node.go:178]   Kubelet is setting 10.0.0.164 as a DNS nameserver for domain "local"
I0406 08:59:32.296608       1 plugins.go:56] Registering credential provider: .dockercfg
E0406 08:59:33.093823       1 event.go:127] Unable to write event '&api.Event{TypeMeta:api.TypeMeta{Kind:"", APIVersion:""}, ObjectMeta:api.ObjectMeta{Name:"athena.13d26114728cfd92", GenerateName:"", Namespace:"", SelfLink:"", UID:"", ResourceVersion:"", CreationTimestamp:util.Time{Time:time.Time{sec:0, nsec:0x0, loc:(*time.Location)(nil)}}, DeletionTimestamp:(*util.Time)(nil), Labels:map[string]string(nil), Annotations:map[string]string(nil)}, InvolvedObject:api.ObjectReference{Kind:"Node", Namespace:"", Name:"athena", UID:"athena", APIVersion:"", ResourceVersion:"", FieldPath:""}, Reason:"starting", Message:"Starting kubelet.", Source:api.EventSource{Component:"kubelet", Host:"athena"}, FirstTimestamp:util.Time{Time:time.Time{sec:63563907572, nsec:0x10a07592, loc:(*time.Location)(0x328f180)}}, LastTimestamp:util.Time{Time:time.Time{sec:63563907572, nsec:0x10a07592, loc:(*time.Location)(0x328f180)}}, Count:1}': 'events "athena.13d26114728cfd92" already exists' (will not retry!)

And there is a management console available.

You first create a project :

openshift ex new-project proj2 --description="test desc 2" --display-name="displee naam 2" --admin=admin

Install the stuff on another Centos7 virtualbox image, see OpenShift Setup details and Installation.

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