简介
Docker是一个开源的应用容器引擎,可以将一整套环境打包成镜像,不需要重复配置环境.可以将每个Docker理解为盒子,在盒子中装任何想要的东西.而每个盒子之间不会互相影响,各司其职.
当一台服务器上有多个docker环境(nginx+php或apache+php),它们之间是不会相互影响的.例如当nginx环境的站点访问量剧增,CPU上升导致卡顿,那同一台服务器下的apache环境也会收到影响.而Docker进程隔离互不影响.
使用Docker启动速度快,保证了环境的一致性.解决了环境问题,例如很常见的在自己的开发环境运行的好好的,当上线到测试环境或者正式环境就出现错误的问题.
Docker安装
# 设置仓库所需包
[root@docker ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
# 设置仓库
[root@docker ~]# sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 设置源
[root@docker ~]# sudo yum install -y docker-ce docker-ce-cli containerd.io
# 查看版本
[root@docker ~]# docker version
# 输出信息.出现客户端版本,不能连接daemon的信息(原因没启动docker)
Client:
Version: 1.13.1
API version: 1.26
Package version:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
# 开启docker服务
service docker start
# 查看docker版本
docker version
# 输出信息
Client: Docker Engine - Community
Version: 20.10.14
API version: 1.41
Go version: go1.16.15
Git commit: a224086
Built: Thu Mar 24 01:49:57 2022
OS/Arch: linux/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.14
API version: 1.41 (minimum version 1.12)
Go version: go1.16.15
Git commit: 87a90dc
Built: Thu Mar 24 01:48:24 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.5.11
GitCommit: 3df54a852345ae127d1fa3092b95168e4a88e2f8
runc:
Version: 1.0.3
GitCommit: v1.0.3-0-gf46b6ba
docker-init:
Version: 0.19.0
GitCommit: de40ad0安装docker应用程序
# 搜索docker
brew search docker
# 安装docker应用程序
brew cask install docker启动Docker应用程序,在状态栏出现登录界面,登录即可启动
登录成功后Docker状态栏为启动中
验证
# 输出docker
docker version
# 输出信息
Client: Docker Engine - Community
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:21:11 2020
OS/Arch: darwin/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.8
API version: 1.40 (minimum version 1.12)
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:29:16 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683Docker镜像
# vi /etc/docker/daemon.json 没有创建该文件
{"registry-mirrors":["https://hub-mirror.c.163.com","https://registry.docker-cn.com"]}
# 重启
service docker restart
# 查看镜像信息
docker info
# 注册镜像部分信息
Registry Mirrors:
https://hub-mirror.c.163.com
https://registry.docker-cn.com点击状态栏Docker->Preferences->Docker Engine
修改镜像地址
{
"experimental": false,
"debug": true,
"registry-mirrors": [
"https://hub-mirror.c.163.com",
"https://registry.docker-cn.com"
]
}
验证
docker info
# 注册镜像部分信息
Registry Mirrors:
https://hub-mirror.c.163.com/
https://registry.docker-cn.com/
