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Docker | Install

 2 years ago
source link: https://ijayer.github.io/post/tech/devops/docker/20170408-docker-01-install/
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本文基于Ubuntu16.04_64bit_OS 和 CentOS7_64bit_OS

  • 查看系统信息

    • $ uname -a
      Linux device_name 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  • 使用root账号进行安装

安装前准备

Ubuntu

  • 升级包管理器

    $ apt-get update
    $ apt-get upgrade

  • 安装其他包

基本Linux内核镜像,内置了AUFS

    $ apt-get install linux-image-generic-lts-trusty
    $ apt-get install -y --install-recommends linux-generic-lts-xenial
    $ reboot

Centos

  • $ yum upgrade -y

安装Docker

Docker自动安装脚本

$ curl -sSL https://get.docker.com/ | sh   // 官方
$ wget -qO- https://get.docker.com/ | sh   // 获取最新版

# 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 your-user`
# Remember that you will have to log out and back in for # this to take effect!
# 安装完成后执行如下命令

$ usermod -aG docker $USER

查看安装版本

$ docker version
Client:
Version:      17.03.1-ce
API version:  1.27
Go version:   go1.7.5
Git commit:   c6d412e
Built:        Fri Mar 24 00:40:33 2017
OS/Arch:      linux/amd64
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

* 此问题是因为没有建立docker用户组而导致的，解决方法参考·建立Docker用户组

建立Docker用户组

注意:

  • docker群组相当于root用户
  • docker默认使Unix Socket与Docker引擎通信，而只有root和docker组的用户才可以访问Docker引擎的Unix Socket
# 建立docker用户组
$ groupadd docker

# 将当前账号加入docker组
$ usermod -aG docker $USER

Issue & Solution

调整内存和交换空间(GRUB)

centos不需要配置这一步

  • 在Docker使用过程中可能出现下面信息WARNING：原因是没有开启内存和交换空间，即要修改系统的GUN GRUB(GUN Grand Unified Bootloader)

    WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.

  • 开启GRUB步骤如下：

    # 编辑GRUB配置文件
$ gedit /etc/default/grub

# 设置GRUB_CMDLINE_LINUX的值如下
$ GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1" //配置后的结果见下图

# 更新GRUB
$ update-grub
$ reboot

  • GRUB Config File

  • 没有开启内存和交换空间 Issue & Solution

阿里云安装脚本

$ curl -sSL http://acs-public-mirror.oss-cn-hangzhou.aliyuncs.com/docker-engine/internet | sh -
$ docker version

DaoCloud安装脚本

$ curl -sSL https://get.daocloud.io/docker | sh
$ docker version

Docker守护进程启动失败

只有root和docker组的用户才可以访问Docker引擎的Unix Socket，出现如下错误则是当前用户没有添加到docker用户组导致

    Q:  docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.

    A:  root@boyzhe:~# usermod -aG docker $USER
        root@boyzhe:~# reboot
        root@boyzhe:~# docker version

        Client:
        Version:      17.03.1-ce
        API version:  1.27
        Go version:   go1.7.5
        Git commit:   c6d412e
        Built:        Fri Mar 24 00:40:33 2017
        OS/Arch:      linux/amd64

        Server:
        Version:      17.03.1-ce
        API version:  1.27 (minimum version 1.12)
        Go version:   go1.7.5
        Git commit:   c6d412e
        Built:        Fri Mar 24 00:40:33 2017
        OS/Arch:      linux/amd64
        Experimental: false

没有开启内存和交换空间

    Q:  root@boyzhe:~# docker run -d --name web -m 512m -p 8080:80 joshhu/webdemo
        Status: Downloaded newer image for joshhu/webdemo:latest
    WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.

    A:  参考上文：调整内存和交换空间(GRUB)

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