02-docker 入门安装

1.配置主机名及关闭selinux

[root@localhost ~]# hostnamectl set-hostname docker03
[root@localhost ~]# hostname
docker02
[root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
[root@localhost ~]# setenforce 0

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
[root@localhost ~]# systemctl status firewalld

[root@localhost ~]# reboot

2.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。 CentOS 7 满足最低内核的要求，但由于内核版本比较低，部分功能（如 overlay2 存储层驱动）无法使用，并且部分功能可能不太稳定

3.卸载旧版本

[root@docker03 ~]# yum remove docker docker-common docker-selinux docker-engine

 4.安装依赖包

[root@docker03 ~]# yum install -y yum-utils device-mapper-persistent-data lvm2

[root@docker03 ~]# yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# 安装 Docker CE
[root@docker03 ~]# yum makecache fast
[root@docker03 ~]# yum install docker-ce

[root@docker03 ~]#  systemctl start docker
[root@docker03 ~]# systemctl enable docker

=========================================================================================================
# 官方源，速度很慢，上面用阿里云源
#[root@docker03 ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# 备注，在生产环境我们可能需要安装特定的docker版本，这时我们可以先找到需要的版本
[root@docker03 ~]# yum list docker-ce --showduplicates | sort -r
 * updates: mirrors.aliyun.com
Loading mirror speeds from cached hostfile
Loaded plugins: fastestmirror
 * extras: mirrors.aliyun.com
docker-ce.x86_64            17.12.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.12.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable
docker-ce.x86_64            17.03.0.ce-1.el7.centos             docker-ce-stable
 * base: centos.ustc.edu.cn
Available Packages

 5.安装效验

[root@docker03 ~]# 
[root@docker03 ~]# docker version
Client:
 Version:	17.12.1-ce
 API version:	1.35
 Go version:	go1.9.4
 Git commit:	7390fc6
 Built:	Tue Feb 27 22:15:20 2018
 OS/Arch:	linux/amd64

Server:
 Engine:
  Version:	17.12.1-ce
  API version:	1.35 (minimum version 1.12)
  Go version:	go1.9.4
  Git commit:	7390fc6
  Built:	Tue Feb 27 22:17:54 2018
  OS/Arch:	linux/amd64
  Experimental:	false

 6.测试docker安装是否正确，若能正常输出以上信息，则说明安装成功

[root@docker03 ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
ca4f61b1923c: Pull complete 
Digest: sha256:97ce6fa4b6cdc0790cda65fe7290b74cfebd9fa0c9b8c38e979330d547d22ce1
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://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/