Centos7 Docker环境安装

目标

• 从哪下载
• 如何安装
• 验证安装成功

从哪下载

官网：https://docs.docker.com/
本文以Centos7为准，如果之前有旧版本可以参照官网步骤卸载掉

如何安装

在安装前需要关闭防火墙和SELINUX=disabled

[root@k8s-master tomcat]# systemctl stop firewalld
[root@k8s-master tomcat]# systemctl disable firewalld
[root@k8s-master tomcat]# vim /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     disabled - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of disabled.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected. 
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

以上配置后执行下面一套命令

# 安装依赖包
yum install -y yum-utils device-mapper-persistent-data lvm2

# 添加Docker软件包源
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
有些机器可能连接不上地址备用(yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo)

# 安装Docker CE
yum install -y docker-ce

# 启动Docker服务并设置开机启动
systemctl start docker
systemctl enable docker

验证安装成功

命令:docker run hello-world 出现以下信息代表安装成功

[root@k8s-master tomcat]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete 
Digest: sha256:6a65f928fb91fcfbc963f7aa6d57c8eeb426ad9a20c7ee045538ef34847f44f1
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://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

[root@k8s-master tomcat]# 

ok 正式开启Docker之旅！