Docker : Add Images2014/03/13

	Add Images for containers.
[1]	For exmaple, update official image with installing httpd and add it as a new image for containers. The container is generated every time for executing "docker run" command, so add the latest executed container like follows.

# show images

[root@dlp ~]#

docker images

REPOSITORY      TAG         IMAGE ID         CREATED        VIRTUAL SIZE
centos          7           8efe422e6104     2 weeks ago    224 MB
centos          centos7     8efe422e6104     2 weeks ago    224 MB
centos          latest      8efe422e6104     2 weeks ago    224 MB

# start a Container and install httpd

[root@dlp ~]#

docker run centos /bin/bash -c "yum -y update; yum -y install httpd"

[root@dlp ~]#

docker ps -a | head -2

CONTAINER ID    IMAGE      COMMAND                CREATED           STATUS                       PORTS    NAMES
323ceff31212    centos:7   "/bin/bash -c 'yum -   34 seconds ago    Exited (0) 14 seconds ago             silly_pike

# add the Image

[root@dlp ~]#

docker commit 323ceff31212 custom/centos_httpd

bb3a95ec2497a6f99fefa15334fc2ac709c31222023fc9e46eee145d4eb90d09

[root@dlp ~]#

docker images

# show images

REPOSITORY            TAG         IMAGE ID        CREATED          VIRTUAL SIZE
custom/centos_httpd   latest      bb3a95ec2497    28 seconds ago   338.7 MB
centos                7           8efe422e6104    2 weeks ago      224 MB
centos                centos7     8efe422e6104    2 weeks ago      224 MB
centos                latest      8efe422e6104    2 weeks ago      224 MB

# Generate a Container from the new image and execute which command to make sure httpd exists

[root@dlp ~]#

docker run custom/centos_httpd /usr/bin/which httpd

/usr/sbin/httpd

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