Docker : Add Images2017/12/21

	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       422dc563ca32        5 weeks ago         252 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                    ...
a4de985f662a    fedora    "/bin/bash -c 'dnf..."   About a minute ago   Exited (0) 14 seconds ago ...

# add the image

[root@dlp ~]#

docker commit a4de985f662a srv.world/fedora_httpd

sha256:32918df26202e1c22ac9b496cc51c2c451ad3511b160ddb8994010da63a8d834

# show images

[root@dlp ~]#

docker images

REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
srv.world/fedora_httpd   latest              32918df26202        12 seconds ago      564 MB
docker.io/fedora         latest              422dc563ca32        5 weeks ago         252 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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