CentOS 7
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Docker : Add Images
2015/01/10
 
Add Images for container.
[1] For exmaple, update official image with installing httpd and add it as a new image for container. 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        4 days ago          224 MB
centos              centos7             8efe422e6104        4 days ago          224 MB
centos              latest              8efe422e6104        4 days 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
a0294a053f8c   centos:7   "/bin/bash -c 'yum -   37 seconds ago  Exited (0) 19 seconds ago         suspicious_morse
# add the Image

[root@dlp ~]#
docker commit a0294a053f8c my_image/centos_httpd

d0938f54bfd62c2a108249c1f969aaeb80be51fbbaee15b594004d4875327609
# show images

[root@dlp ~]#
docker images 

REPOSITORY              TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
my_image/centos_httpd   latest              d0938f54bfd6        17 seconds ago      338.3 MB
centos                  7                   8efe422e6104        4 days ago          224 MB
centos                  centos7             8efe422e6104        4 days ago          224 MB
centos                  latest              8efe422e6104        4 days ago          224 MB
# Generate a Container from the new image and execute which command to make sure httpd exists

[root@dlp ~]#
docker run my_image/centos_httpd /usr/bin/which httpd

/usr/sbin/httpd
 
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