Docker安装和卸载

$ sudo yum remove docker \
                  docker-common \
                  docker-selinux \
                  docker-engine

#yum update -y

cat >/etc/yum.repos.d/docker.repo <<-'EOF'
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg
EOF

#yum install docker-ce

#systemctl enable docker.service

#systemctl start docker

#docker run --rm hello-world

--------------------------------------------------- 以下是程序输出
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c04b14da8d14: Pull complete
Digest: sha256:0256e8a36e2070f7bf2d0b0763dbabdd67798512411de4cdcf9431a1feb60fd9
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
   1. The Docker client contacted the Docker daemon.
   2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
   3. The Docker daemon created a new container from that image which runs the
      executable that produces the output you are currently reading.
   4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker Hub account:
 https://hub.docker.com

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

sudo usermod -aG docker your_username

#sysctl net.ipv4.ip_forward

#sysctl -w net.ipv4.ip_forward=1

#echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
#sysctl -p
#sysctl net.ipv4.ip_forward

yum list installed | grep docker

sudo yum -y remove docker-engine.x86_64

rm -rf /var/lib/docker

rpm -e --nodeps `rpm -aq |grep docker`