微服务架构持续集成：（二）在CentOS 7安装和部署Docker_centos 7 docker 部署微服务-优快云博客

本文详细介绍了如何在CentOS 7系统中进行Docker的安装，包括启动Docker、设置镜像源、开放和配置管理端口，并通过修改环境变量确保配置生效，最后通过重启Docker验证安装和配置是否成功。

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1、初步安装和启动docker

yum update -y
yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum -y install docker-ce
systemctl start docker

2、设置镜像

vi /etc/docker/daemon.json

{
  "registry-mirrors": ["https://aj2rgad5.mirror.aliyuncs.com"]
}

3、开放管理端口映射

vi /lib/systemd/system/docker.service

将第11行的ExecStart=/usr/bin/dockerd，替换为：

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock -H tcp://0.0.0.0:7654

2375是管理端口，7654是备用端口

将docker管理端口配置在环境变量中，

vi /etc/prifile

export DOCKER_HOST=tcp://0.0.0.0:2375

source /etc/prifile

4、重启docker

systemctl daemon-reload && service docker restart

5、测试docker是否正常安装和运行

[root@cache01 system]# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world
1b930d010525: Pull complete 
Digest: sha256:41a65640635299bab090f783209c1e3a3f11934cf7756b09cb2f1e02147c6ed8
Status: Downloaded newer image for docker.io/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@cache01 system]#