Linux 安装docker

1. 首先我们创建一个目录赋予权限并进入该目录

   vagrant@ubuntu-xenial:~$ sudo mkdir  -m 775 -vp  /data/www  && cd /data/www
    mkdir: created directory '/data'
    mkdir: created directory '/data/www'

2. 安装docker本身

   sudo wget -qO- https://get.docker.com | sh
   或者
   curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun
   也可以使用国内 daocloud 一键安装命令：
   curl -sSL https://get.daocloud.io/docker | sh

   解释一下命令的意思：

   sudo:_当前命令我希望用root用户执行_

   wget:_是命令行的一个下载工具_

   -qO-:_让wget标准输出_

   | sh :_交给shell去执行_

   总的连起来:_以root用户身份用wget下载工具下载一个shell脚本文件标准输出交给sh执行_

   vagrant@ubuntu-xenial:/data/www$ sudo wget -qO- https://get.docker.com | sh
   # Executing docker install script, commit: 26ff363bcf3b3f5a00498ac43694bf1c7d9ce16c
   + sudo -E sh -c apt-get update -qq >/dev/null
   + sudo -E sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null
   + sudo -E sh -c curl -fsSL "https://download.docker.com/linux/ubuntu/gpg" | apt-key add -qq - >/dev/null
   + sudo -E sh -c echo "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable" > /etc/apt/sources.list.d/docker.list
   + sudo -E sh -c apt-get update -qq >/dev/null
   + [ -n  ]
   + sudo -E sh -c apt-get install -y -qq --no-install-recommends docker-ce >/dev/null
   + sudo -E sh -c docker version
   Client: Docker Engine - Community
    Version:           19.03.12
    API version:       1.40
    Go version:        go1.13.10
    Git commit:        48a66213fe
    Built:             Mon Jun 22 15:45:49 2020
    OS/Arch:           linux/amd64
    Experimental:      false
   
   Server: Docker Engine - Community
    Engine:
     Version:          19.03.12
     API version:      1.40 (minimum version 1.12)
     Go version:       go1.13.10
     Git commit:       48a66213fe
     Built:            Mon Jun 22 15:44:20 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
   If you would like to use Docker as a non-root user, you should now consider
   adding your user to the "docker" group with something like:
   
     sudo usermod -aG docker vagrant
   
   Remember that you will have to log out and back in for this to take effect!
   
   WARNING: Adding a user to the "docker" group will grant the ability to run
            containers which can be used to obtain root privileges on the
            docker host.
            Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
            for more information.
   
   

3. 允许非root用户运行docker

   vagrant@ubuntu-xenial:/data/www$ sudo usermod -aG docker vagrant  #修改用户组，把当前用户加到docker组里 
   vagrant@ubuntu-xenial:/data/www$ newgrp docker                    # 切换用户组

4. 测试是否成功

   vagrant@ubuntu-xenial:/data/www$ docker info  # 测试是否可以打印出docker信息
   Client:
    Debug Mode: false
   
   Server:
    Containers: 0
     Running: 0
     Paused: 0
     Stopped: 0
    Images: 0
    Server Version: 19.03.12
    Storage Driver: overlay2
     Backing Filesystem: extfs
     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:
     apparmor
     seccomp
      Profile: default
    Kernel Version: 4.4.0-161-generic
    Operating System: Ubuntu 16.04.6 LTS
    OSType: linux
    Architecture: x86_64
    CPUs: 2
    Total Memory: 991.9MiB
    Name: ubuntu-xenial
    ID: G2VB:OFWI:G55A:SZLO:QZMV:O4UX:XKJT:ANWD:3VDI:4JET:G5SM:NNYE
    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
   
   WARNING: No swap limit support