Docker : Add Container Images2019/05/10

	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              d09302f77cfc        8 weeks ago         275 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
434f8f99fc2c        fedora              "/bin/bash -c 'dnf..."   2 minutes ago       Exited (0) 44 seconds ago                        vigilant_volhard

# add the image

[root@dlp ~]#

docker commit 434f8f99fc2c srv.world/fedora_httpd

sha256:3e633f065d3bea9b6752ab6ebe9aa16d0a3a2d4bb824d44a06788cab9f794ea3

# show images

[root@dlp ~]#

docker images

REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
srv.world/fedora_httpd   latest              3e633f065d3b        22 seconds ago      595 MB
docker.io/fedora         latest              d09302f77cfc        8 weeks ago         275 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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