Centos7安装Docker

通用安装方式

Docker 软件包已经包括在默认的 CentOS-Extras 软件源(联网使用centos7u2自带网络Yum源)里。因此想要安装 docker，只需要运行下面的 yum 命令：
yum -y install docker

启动 Docker 服务:
CentOS 7
systemctl start docker.service
systemctl enable docker.service

确定docker服务在运行
结果会显示服务端和客户端的版本，如果只显示客户端版本说明服务没有启动
docker version

Client:
Version:         1.10.3
API version:     1.22
Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
Go version:      go1.6.3
Git commit:      cb079f6-unsupported
Built:           Fri Sep 16 13:24:25 2016
OS/Arch:         linux/amd64

Server:
Version:         1.10.3
API version:     1.22
Package version: docker-common-1.10.3-46.el7.centos.14.x86_64
Go version:      go1.6.3
Git commit:      cb079f6-unsupported
Built:           Fri Sep 16 13:24:25 2016
OS/Arch:         linux/amd64

查看docker基本信息：
docker info

校验Docker的安装
docker run -it ubuntu bash

Unable to find image 'ubuntu:latest' locally
Trying to pull repository daocloud.io/ubuntu ... 
latest: Pulling from daocloud.io/ubuntu
22ecafbbcc4a: Pull complete 
580435e0a086: Pull complete 
Digest: sha256:80c2902178d79f439b13c5a244f3b1ef67ca890dbbe58d19caa13301ca56a505

国内源安装

阿里源:https://mirrors.aliyun.com
删除已安装的Docker
yum -y remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine
配置阿里云Docker Yum源
yum install -y yum-utils device-mapper-persistent-data lvm2 git
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装指定版本
查看Docker版本
yum list docker-ce --showduplicates
安装较旧版本（比如Docker 17.03.2)
需要指定完整的rpm包的包名，并且加上--setopt=obsoletes=0 参数
yum install -y --setopt=obsoletes=0 docker-ce-17.03.2.ce-1.el7.centos.x86_64 docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch

安装Docker新版本（比如Docker 19.0.3)
加上rpm包名的版本号部分或不加都可以：
yum install docker-ce-19.0.3.ce -y
yum install docker-ce -y

启动Docker服务
systemctl enable docker
systemctl start docker

查看Docker版本状态
docker -v

Docker version 19.03.8, build afacb8b

docker version

Client: Docker Engine - Community
     Version:           19.03.8
     API version:       1.40
     Go version:        go1.12.17
     Git commit:        afacb8b
     Built:             Wed Mar 11 01:27:04 2020
     OS/Arch:           linux/amd64
     Experimental:      false

    Server: Docker Engine - Community
     Engine:
      Version:          19.03.8
      API version:      1.40 (minimum version 1.12)
      Go version:       go1.12.17
      Git commit:       afacb8b
      Built:            Wed Mar 11 01:25:42 2020
      OS/Arch:          linux/amd64
      Experimental:     false
     containerd:
      Version:          1.2.13
      GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
     runc:
      Version:          1.0.0-rc10
      GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
     docker-init:
      Version:          0.18.0
      GitCommit:        fec3683

查看docker运行状态
docker info

Client:
        Debug Mode: false
    Server:
     Containers: 0
      Running: 0
      Paused: 0
      Stopped: 0
     Images: 0
     Server Version: 19.03.8
     Storage Driver: overlay2
      Backing Filesystem: <unknown>
      Supports d_type: true
      Native Overlay Diff: true
     Logging Driver: json-file
     Cgroup Driver: cgroupfs
     Plugins:
      Volume: local
      Network: bridge host ipvlan macvlan null overlay
      Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
     Swarm: inactive
     Runtimes: runc
     Default Runtime: runc
     Init Binary: docker-init
     containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
     runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
     init version: fec3683
     Security Options:
      seccomp
       Profile: default
     Kernel Version: 3.10.0-1062.18.1.el7.x86_64
     Operating System: CentOS Linux 7 (Core)
     OSType: linux
     Architecture: x86_64
     CPUs: 2
     Total Memory: 3.84GiB
     Name: HSY
     ID: KX4W:ZAV4:W3I6:ZPIJ:ZFFP:P3S3:5PNS:3C4L:WBDR:RPXJ:R6SE:FREH
     Docker Root Dir: /var/lib/docker
     Debug Mode: false
     Registry: https://index.docker.io/v1/
     Labels:
     Experimental: false
     Insecure Registries:
      127.0.0.0/8
     Live Restore Enabled: false

报错解决

docker info的时候报如下错误

bridge-nf-call-iptables is disabled

追加如下配置,然后重启系统
vim /etc/sysctl.conf

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