Install Docker

  1. Install the Docker in CentOS 7.x

    # install docker in centos 7.x
user $ sudo -i # access by root
root $ curl -fsSL <https://get.docker.com> -o get-docker.sh
root $ sh get-docker.sh
root $ usermod -aG docker user
root $ usermod -aG docker usersu
root $ systemctl restart docker # better way

# root $ service docker restart

  2. Change the root dir of Docker

    1. Check current root dir

      user $ systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since 목 2019-03-28 16:35:40 KST; 19h ago
     Docs: https://docs.docker.com
 Main PID: 142103 (dockerd)
    Tasks: 24
   Memory: 34.5M
   CGroup: /system.slice/docker.service
           ├─142103 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
           └─155121 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 80 -container-ip 172.17.0.2 -container-port 9000

    2. Create new root dir

      user $ mkdir -p ~/apps/docker_root
root $ vi /usr/lib/systemd/system/docker.service

    3. Update root dir path

      docker.service file
      [Service]
ExecStart=/usr/bin/dockerd -g /home/user/apps/docker_root -H unix://

    4. Restart

      root $ systemctl daemon-reload
root $ systemctl restart docker

user $ docker info | grep Root
Docker Root Dir: /var/lib/docker

Upgrade Docker

  1. Check system environment and versions

    $ cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)

$ uname -a
Linux host-name 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ docker --version
Docker version 18.09.0, build 4d60db4

# Check all docker versions
$ pid_dock=$(ps -ef | awk '$8~/(^|\/)dockerd($|-ce$|-current$)/ {print $2}'); if [ $pid_dock > 0 ]; then   docker_exe=$(ls -l /proc/$pid_dock/exe | awk -F'-> ' '{print $2}');   $docker_exe -v | awk '{print $3}' | sed 's/,//g'; fi;
19.03.1

  2. Stop docker engine

    sudo $ systemctl stop docker

  3. TODO

    # dwnload rpm file
$ wget https://download.docker.com/linux/centos/7/x86_64/...
# check installed docker
$ yum list docker-ce --showduplicates | sort -r
# upgrade docker
$ sudo yum upgrade docker-ce docker-ce-cli

  4. Start docker engine

    sudo $ systemctl restart docker

References