Docker : Install

Install Docker which is the Operating System-Level Virtualization Tool, which automates the deployment of applications inside Containers.
[1]	Install Docker.

[root@dlp ~]#  yum -y install docker [root@dlp ~]#  systemctl start docker  [root@dlp ~]#  systemctl enable docker

[2]	Download the official image and create a Container and output the words "Welcome to the Docker World" inside the Container.

# download a centos image [root@dlp ~]#  docker pull centos  Trying to pull repository docker.io/library/centos ... latest: Pulling from library/centos 47d44cb6f252: Extracting 32 B/32 B ... ... # run echo inside Container [root@dlp ~]#  docker run centos /bin/echo "Welcome to the Docker World"  Welcome to the Docker World

[3]	Connect to the interactive session of a Container with "i" and "t" option like follows. If exit from the Container session, the process of a Container finishes.

[root@dlp ~]#  docker run -i -t centos /bin/bash  [root@06c8cbea8dc3 /]#      # Container's console bash-4.3#  uname -a  Linux 06c8cbea8dc3 3.10.0-123.13.2.el7.x86_64 #1 SMP Thu Dec 18 14:09:13 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [root@06c8cbea8dc3 /]#  exit  exit [root@dlp ~]#      # back

[4]	If exit from the Container session with keeping container's process, push Ctrl+p, and Ctrl+q key.

[root@dlp ~]#  docker run -i -t centos /bin/bash  [root@64241ed538ed /]# [root@dlp ~]#      # Ctrl+p, Ctrl+q key to back to Host's console [root@dlp ~]#  docker ps       # show docker process CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 64241ed538ed centos:7 "/bin/bash" 35 seconds ago Up 34 seconds clever_bartik # connect to container's session [root@dlp ~]#  docker attach 64241ed538ed  [root@64241ed538ed /]#      # connected # shutdown container's process from Host's console [root@dlp ~]#  docker kill 64241ed538ed  [root@dlp ~]#  docker ps  CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES