Docker : Add Container Images2018/11/07

	Add Images for Containers.
[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             SIZE
docker.io/fedora    latest              c582c1438f27        8 weeks ago         254 MB

# start a Container and install httpd

[root@dlp ~]#

docker run fedora /bin/bash -c "dnf -y upgrade; dnf -y install httpd"

[root@dlp ~]#

docker ps -a | head -2

CONTAINER ID   IMAGE    COMMAND                  CREATED         STATUS                       PORTS  NAMES
60c278b2ee8f   fedora   "/bin/bash -c 'dnf..."   2 minutes ago   Exited (0) 10 seconds ago           jovial_bhabha

# add the image

[root@dlp ~]#

docker commit 60c278b2ee8f srv.world/fedora_httpd

sha256:797e290c206f1910bfed4ac16a740d77b7790ef4f96de18cd37a816ebdbc6ae6

# show images

[root@dlp ~]#

docker images

REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
srv.world/fedora_httpd   latest              797e290c206f        11 seconds ago      526 MB
docker.io/fedora         latest              c582c1438f27        8 weeks ago         254 MB

# Generate a Container from the new image and execute [whereis] to make sure httpd exists

[root@dlp ~]#

docker run srv.world/fedora_httpd /usr/bin/whereis httpd

httpd: /usr/sbin/httpd /usr/lib64/httpd /etc/httpd /usr/share/httpd

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