Docker from entry to the master (a)
BACKGROUND a. (Physical -> Virtualization (the hypervisor resource isolation) -> of the container)
Between the development and operation and maintenance as a result of conflicts in different environments, in order to solve collaboration between developers and operation and maintenance personnel, accelerate application delivery
DevOps(Development and Operations)
About two .docker
Docker is an open source application container engine that lets developers can package their applications and dependencies into a portable mirror, and then publish to any of the popular Linux on a Windows machine or can be achieved virtualization . The container is full use of the sandbox mechanism will not have any interface with each other. Standardized environment: one package, publish everywhere, providing application packaging, deployment and operation of container platforms.
2.1 with the container mirror
Mirror: the file read-only, providing a complete hardware and software resources to run the program, the "container" application;
Container: Example mirrored by Docker responsible for creating, between the container isolated from each other;
Three .docker installation
Docker offers two versions: Community Edition (CE) and Enterprise Edition (EE)
Operating system requirements: to Centos7 for example, and Docker requires the operating system must be 64-bit, and centos kernel version 3.1 and above.
Viewing the kernel version information:
[root@centos7 ~]# uname -r
3.10.0-1062.9.1.el7.x86_64
3.1 uninstall the old version
[root@centos7 ~]# yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine
[root@centos7 ~]# yum remove docker-ce
3.2 安装docker-ce
1.安装依赖包
[root@centos7 lib]# yum install -y yum-utils device-mapper-persistent-data lvm2
2.替换国外安装源
[root@centos7 lib]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
已加载插件：fastestmirror
adding repo from: https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
grabbing file https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
3.更新yum软件包索引
[root@centos7 lib]# yum makecache fast
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
docker-ce-stable | 3.5 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/2): docker-ce-stable/x86_64/updateinfo | 55 B 00:00:00
(2/2): docker-ce-stable/x86_64/primary_db | 37 kB 00:00:00
元数据缓存已建立
4.安装最新版本docker-ce
[root@centos7 lib]# yum -y install docker-ce
#安装指定版本docker-ce可使用以下命令查看
yum list docker-ce.x86_64 --showduplicates | sort -r
# 安装完成之后可以使用命令查看
[root@centos7 lib]# docker version
5.启动docker服务
[root@centos7 lib]# service docker start
3.3 验证docker运行
1.拉取镜像文件
[root@centos7 lib]docker pull hello-world
2.运行镜像文件
[root@centos7 lib]docker run hello-world
四.docker的镜像加速配置（国外镜像有可能无法成功下载）
4.1 注册登录开通阿里云容器镜像服务 https://account.aliyun.com/login/login.htm
4.2配置镜像加速服务地址信息
1.创建启动文件夹 sudo mkdir -p /etc/docker 2.创建镜像加速文件 sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors": ["https://8dvlx2wz.mirror.aliyuncs.com"] } EOF #vim /etc/docker/daemon.json #{ # "registry-mirrors": ["https://8dvlx2wz.mirror.aliyuncs.com"]
#} 3.重载配置文件 sudo systemctl daemon-reload 4.重启docker服务 sudo systemctl restart docker
五.docker的执行流程
5.1 docker常用命令
1.docker pull 镜像名<:tags版本号> - 从远程仓库抽取镜像 2.docker images - 查看本地镜像 3.docker run 镜像名<:tags版本号> - 创建容器，启动应用 4.docker ps - 查看正在运行中的镜像 5.docker rm <-f 强制删除> 容器id - 删除容器 6.docker rmi <-f 强制删除> 镜像名:<:tags版本号> - 删除镜像
5.2 安装Tomcat应用
1.拉取Tomcat镜像
1.docker pull tomcat
2.运行Tomcat
docker run -p 主机端口:容器端口 镜像ID或镜像名:TAG