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
