Linux下Docker的安装

Linux下Docker的安装

系统版本

 查看当前系统版本:

 cat /etc/redhat-release

 CentOS Linux release 7.5.1804 (Core) 

系统要求

Docker CE支持64位版本 Centos 7，并且要求内核版本不低于3.10。

卸载旧版本的Docker

sudo yum remove docker 
                 docker-client 
                 docker-client-latest 
                 docker-common 
                 docker-latest 
                 docker-lates-logrotate 
                 docker-logrotate 
                 docker-selinux 
                 docker-engine-selinux 
                 docker-engine

卸载完成之后接下来使用 yum 来安装：

sudo yum install -y yum-utils 
                     device-mapper-persistent-data 
                     lvm2

添加yum 软件源:

sudo yum-config-manager --add-repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo

安装Docker CE

更新yum软件源缓存，并安装:
 sudo yum makecache fast
 sudo yum install docker-ce

使用脚本自动安装:

curl -fsSl get.docker.com -o get-docker.sh
 sudo sh get-docker.sh --mirror Aliyun

执行完成这个脚本之后，docker ce 一切就准备就绪了，并且把 docker ce 的 edge 版本安装在系统中。

安装完成之后，启动 Docker:

 sudo systemctl enable docker
 sudo systemctl start docker

建立 Docker 用户组:

sudo groupadd docker     # docker是创建的docker组

建立完成之后，将当前登录用户添加到 docker 组中:

sudo usermod -aG docker $USER

已添加完成之后，退出当前终端并关闭，重新打开一个终端，测试Docker是否安装成功:

docker run hello-world

 # 成功
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:0e11c388b664df8a27a901dce21eb89f11d8292f7fca1b3e3c4321bf7897bffe
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.
    (amd64)
 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 ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

添加内核参数，如果使用Docker的过程中出现如下信息:

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

请添加内核配置参数以启用这些功能:

sudo tee -a /etc/sysctl.conf <<-EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

然后重新加载:

sudo sysctl -p

加载成功之后显示:

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1