Showing posts with label Docker. Show all posts
Showing posts with label Docker. Show all posts

Friday, January 8, 2016

Docker : build Ubuntu from Dockerfile

# ls -l
total 64240
-rw-r----- 1 root root     1383 Jan  8 13:39 Dockerfile
-rw-r----- 1 root root 65776957 Jan  8 13:40 ubuntu-trusty-core-cloudimg-amd64-root.tar.gz

These 2 files are downloaded from https://hub.docker.com/_/ubuntu/ (14.04)

# cat Dockerfile
FROM scratch
ADD ubuntu-trusty-core-cloudimg-amd64-root.tar.gz /

# a few minor docker-specific tweaks
# see https://github.com/docker/docker/blob/master/contrib/mkimage/debootstrap
RUN echo '#!/bin/sh' > /usr/sbin/policy-rc.d \
        && echo 'exit 101' >> /usr/sbin/policy-rc.d \
        && chmod +x /usr/sbin/policy-rc.d \
        \
        && dpkg-divert --local --rename --add /sbin/initctl \
        && cp -a /usr/sbin/policy-rc.d /sbin/initctl \
        && sed -i 's/^exit.*/exit 0/' /sbin/initctl \
        \
        && echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup \
        \
        && echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean \
        && echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean \
        && echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean \
        \
        && echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages \
        \
        && echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes

# enable the universe
RUN sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list

# overwrite this with 'CMD []' in a dependent Dockerfile
CMD ["/bin/bash"]

---------------------------------
Now build ubuntu from Dockerfile

# docker build /tmp/ubuntu
Sending build context to Docker daemon 65.78 MB
Sending build context to Docker daemon
Step 0 : FROM scratch
 --->
Step 1 : ADD ubuntu-trusty-core-cloudimg-amd64-root.tar.gz /
 ---> 722fff301cf8
Removing intermediate container 3ac8f98d2503
Step 2 : RUN echo '#!/bin/sh' > /usr/sbin/policy-rc.d   && echo 'exit 101' >> /usr/sbin/policy-rc.d     && chmod +x /usr/sbin/policy-rc.d               && dpkg-divert --local --rename --add /sbin/initctl     && cp -a /usr/sbin/policy-rc.d /sbin/initctl    && sed -i 's/^exit.*/exit 0/' /sbin/initctl             && echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup             && echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean   && echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean   && echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean              && echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages          && echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes
 ---> Running in ca06d044f4ea
Adding 'local diversion of /sbin/initctl to /sbin/initctl.distrib'
 ---> c1007a188518
Removing intermediate container ca06d044f4ea
Step 3 : RUN sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list
 ---> Running in 86a418b9a27f
 ---> e369918520d5
Removing intermediate container 86a418b9a27f
Step 4 : CMD /bin/bash
 ---> Running in b4e86758488e
 ---> 9d4dfcbd71bf
Removing intermediate container b4e86758488e
Successfully built 9d4dfcbd71bf

# docker images
REPOSITORY                              TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
<none>                                  <none>              9d4dfcbd71bf        5 minutes ago       187.9 MB
Fedora-Docker-Base-23-20151030.x86_64   latest              79c267013159        10 weeks ago        204.3 MB

# docker tag 9d4dfcbd71bf ubuntu:14.04
# docker images
REPOSITORY                              TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu                                  14.04               9d4dfcbd71bf        6 minutes ago       187.9 MB
Fedora-Docker-Base-23-20151030.x86_64   latest              79c267013159        10 weeks ago        204.3 MB
# docker tag 79c267013159 fedora:latest
# docker images
REPOSITORY                              TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu                                  14.04               9d4dfcbd71bf        8 minutes ago       187.9 MB
Fedora-Docker-Base-23-20151030.x86_64   latest              79c267013159        10 weeks ago        204.3 MB
fedora                                  latest              79c267013159        10 weeks ago        204.3 MB
# docker rmi Fedora-Docker-Base-23-20151030.x86_64
Untagged: Fedora-Docker-Base-23-20151030.x86_64:latest
# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
ubuntu              14.04               9d4dfcbd71bf        9 minutes ago       187.9 MB
fedora              latest              79c267013159        10 weeks ago        204.3 MB


Posted by at No comments:
Labels: ,

Monday, March 30, 2015

Linux : Install docker-io

Red Hat 6.6

Download the following rpm from http://dl.fedoraproject.org/pub/epel/6/x86_64/repoview/

docker-io-1.4.1-3.el6.x86_64.rpm
lua-lxc-1.0.7-1.el6.x86_64.rpm
lua-alt-getopt-0.7.0-1.el6.noarch.rpm
lxc-1.0.7-1.el6.x86_64.rpm
lua-filesystem-1.4.2-1.el6.x86_64.rpm
lxc-libs-1.0.7-1.el6.x86_64.rpm


# rpm -Uvh *.rpm
warning: docker-io-1.4.1-3.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing...                ########################################### [100%]
   1:lxc-libs               ########################################### [ 17%]
   2:lua-filesystem         ########################################### [ 33%]
   3:lua-lxc                ########################################### [ 50%]
   4:lua-alt-getopt         ########################################### [ 67%]
   5:lxc                    ########################################### [ 83%]
   6:docker-io              ########################################### [100%]

# chkconfig --list docker
docker          0:off   1:off   2:on    3:on    4:on    5:on    6:off

# service docker start
Starting cgconfig service:                                 [  OK  ]
Starting docker:                                           [  OK  ]

https://access.redhat.com/articles/881893
http://developerblog.redhat.com/2014/05/15/practical-introduction-to-docker-containers/

Docker has an official CentOS 6 repository which they support:

Download the docker image zip file manually

# cat centos-7-20150304_1234-docker.tar.xz | docker import - centos7:base
f4f6169a4b1175b2ed2f9c9f95369f8eec04b28c41b946280f45205e58bc7c05
# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos7             base                f4f6169a4b11        14 seconds ago      210 MB


Create docker image from my own system 
  1. Create the tar files for your file system, simply could be 
    tar --numeric-owner --exclude=/proc --exclude=/sys -cvf centos6-base.tar /
  2. Transfer the tar file to other docker system if not installed locally and import it
    cat centos6-base.tar | docker import - centos6-base
  3. Now you can verify by running it.
    docker run -i -t centos6-base cat /etc/redhat-release 
     
     
    

    tar --numeric-owner --exclude=/proc --exclude=/sys --exclude=/root \
    --exclude=/var --exclude=/home --exclude=/docker --exclude=/tmp \
    -cvf centos6-base.tar /
    

    cat centos6-base.tar | docker import - centos6-base
500e53a55f35cb64724a544b6b94d2db9629f9910564a3611ab106b78b7fd62f
 
    docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos6-base        latest              500e53a55f35        53 seconds ago      2.621 GB
 
Posted by at No comments:
Labels:

Tuesday, July 1, 2014

Install Docker on CentOS 6

Please also refer here

We are going to install Docker from EPEL repository.

Check if the EPEL repository is there :

# rpm -qa | grep epel
epel-release-6-8.noarch

 I do have epel on my server. If not, you need to install it.
Now continue to install docker-io

$ sudo yum install docker-io
[sudo] password for lo:
Loaded plugins: fastestmirror, priorities, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirror.cs.vt.edu
 * epel: epel.mirror.constant.com
 * extras: mirror.anl.gov
 * updates: mirrors-pa.sioru.com
222 packages excluded due to repository priority protections
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package docker-io.x86_64 0:1.0.0-3.el6 will be installed
--> Processing Dependency: lxc for package: docker-io-1.0.0-3.el6.x86_64
--> Running transaction check
---> Package lxc.x86_64 0:0.9.0-2.el6 will be installed
--> Processing Dependency: liblxc.so.0()(64bit) for package: lxc-0.9.0-2.el6.x86_64
--> Running transaction check
---> Package lxc-libs.x86_64 0:0.9.0-2.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

====================================================================================================================
 Package                     Arch                     Version                          Repository              Size
====================================================================================================================
Installing:
 docker-io                   x86_64                   1.0.0-3.el6                      epel                   4.5 M
Installing for dependencies:
 lxc                         x86_64                   0.9.0-2.el6                      epel                    78 k
 lxc-libs                    x86_64                   0.9.0-2.el6                      epel                   116 k

Transaction Summary
====================================================================================================================
Install       3 Package(s)

Total download size: 4.7 M
Installed size: 24 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): docker-io-1.0.0-3.el6.x86_64.rpm                                                      | 4.5 MB     00:03    
(2/3): lxc-0.9.0-2.el6.x86_64.rpm                                                            |  78 kB     00:00    
(3/3): lxc-libs-0.9.0-2.el6.x86_64.rpm                                                       | 116 kB     00:00    
--------------------------------------------------------------------------------------------------------------------
Total                                                                               1.4 MB/s | 4.7 MB     00:03    
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : lxc-libs-0.9.0-2.el6.x86_64                                                                      1/3
  Installing : lxc-0.9.0-2.el6.x86_64                                                                           2/3
  Installing : docker-io-1.0.0-3.el6.x86_64                                                                     3/3
  Verifying  : docker-io-1.0.0-3.el6.x86_64                                                                     1/3
  Verifying  : lxc-libs-0.9.0-2.el6.x86_64                                                                      2/3
  Verifying  : lxc-0.9.0-2.el6.x86_64                                                                           3/3

Installed:
  docker-io.x86_64 0:1.0.0-3.el6                                                                                   

Dependency Installed:
  lxc.x86_64 0:0.9.0-2.el6                               lxc-libs.x86_64 0:0.9.0-2.el6                             

Complete!

Now it is install. We need to start the Docker daemon.

$ sudo service docker start
Starting docker:                                       [  OK  ]

If we want Docker to start at boot, we need to run this :

$ sudo chkconfig docker on

Now we try test Docker and get the CentOS image

$ sudo docker pull centos:latest
Pulling repository centos
0c752394b855: Download complete
511136ea3c5a: Download complete
34e94e67e63a: Download complete

We make sure we can see the image :

$ sudo docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos              latest              0c752394b855        3 weeks ago         124.1 MB

Now try run bash using this centos image

$ sudo docker run -i -t centos /bin/bash
bash-4.1# ps
  PID TTY          TIME CMD
    1 ?        00:00:00 bash
    6 ?        00:00:00 ps

bash-4.1# df
Filesystem           1K-blocks     Used Available Use% Mounted on
rootfs                10321208   300108   9496812   4% /
/dev/mapper/docker-253:0-1179712-6d24d5cf87a18d748db4bc41f1d591f1fa10aebb0e8f3503be0270d9a557d009
                      10321208   300108   9496812   4% /
tmpfs                  3984768        0   3984768   0% /dev
shm                      65536        0     65536   0% /dev/shm
/dev/mapper/vg_novo-lv_root
                     407481848 84566084 302216836  22% /.dockerinit
/dev/mapper/vg_novo-lv_root
                     407481848 84566084 302216836  22% /etc/resolv.conf
/dev/mapper/vg_novo-lv_root
                     407481848 84566084 302216836  22% /etc/hostname
/dev/mapper/vg_novo-lv_root
                     407481848 84566084 302216836  22% /etc/hosts
tmpfs                  3984768        0   3984768   0% /proc/kcore
bash-4.1# pwd
/
bash-4.1# ls
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  sbin    selinux  srv  sys  tmp    usr  var
Outside of this docker container, we can check what is running :

# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
6d24d5cf87a1        centos:latest       /bin/bash           3 minutes ago       Up 3 minutes                            ecstatic_pare      
Posted by at No comments:
Labels: ,
Subscribe to: Posts (Atom)