Docker : Add Images

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