容器化技术与容器服务（1）

容器化技术与容器服务（2）
准备docker环境
• Docker 版本
– 社区版
– 企业版
• 与 Kubernetes 集成
– 社区版 17.03.2 ce
• CentOS（虚拟机）安装 docker
– 官方指南
• https://docs.docker.com/install/linux/docker-ce/centos/#installdocker-ce
– 中文指南
• http://www.cnblogs.com/freefei/p/9263998.html

检查 docker 安装
~]# docker version
Client:
Version: 17.03.2-ce
API version: 1.27
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64
Server:
Version: 17.03.2-ce
API version: 1.27 (minimum version 1.12)
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64
Experimental: false

~]# docker run hello-world
Unable to find image ‘hello-world:latest’ locally
latest: Pulling from library/hello-world
d1725b59e92d: Pull complete
Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788
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

~]# docker run -it ubuntu bash
Unable to find image ‘ubuntu:latest’ locally
latest: Pulling from library/ubuntu
32802c0cfa4d: Pull complete
da1315cffa03: Pull complete
fa83472a3562: Pull complete
f85999a86bef: Pull complete
Digest: sha256:6d0e0c26489e33f5a6f0020edface2727db9489744ecc9b4f50c7fa671f23c49
Status: Downloaded newer image for ubuntu:latest
root@e2442527555f:/# ls
bin dev home lib64 mnt proc run srv tmp var
boot etc lib media opt root sbin sys usr
root@e2442527555f:/# exit
exit
[root@centos-docker-ex ~]#

显示本地镜像库内容

显示运行中容器

拉取 MySQL 镜像
上面拉取太慢了，所以更改成了网易的源头，pull之后改名

构建docker镜像练习
– 录入以下内容
– 构建镜像
– 运行镜像
• docker run -it --rm hello -H
~] mkdir mydock && cd mydock
mydock]# vi dockerfile
FROM ubuntu
ENTRYPOINT [“top”, “-b”]
CMD ["-c"]
mydock]# docker build . -t hello
Sending build context to Docker daemon


使用MySQL容器
– 启动服务器
– 启动 MySQL 客户端
– mysql 客户端基本操作
• https://blog.youkuaiyun.com/pmlpml/article/details/78602290
~]# sudo docker run -p 3306:3306 --name mysql2 -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7
00cbdb363500c562e7ee552250b6434a33a37301cc24986645d216d6bbcd2f36
[root@centos-docker-ex ~]# docker ps
CONTAINER ID IMAGE COMMAND PORTS NAMES
00cbdb363500 mysql:5.7 “docker-entrypoint…” 0.0.0.0:3306->3306/tcp, 33060/tcp mysql2
~]# docker run -it --net host mysql:5.7 “sh”

mysql -h127.0.0.1 -P3306 -uroot -proot

…
Server version: 5.7.24 MySQL Community Server (GPL)
…
mysql>




使用MySQL容器（挂载卷保存db）
– 数据库文件在哪里？
– Dockerfile 的 VOLUME /var/lib/mysql 的含义
• 每次启动 mysql 容器，docker 创建一个文件卷挂载在容器内/var/lib/mysql位置
• 这个卷在主机（host）的 /var/lib/docker/volumes/ 目录下
~]# docker exec -it mysql2 bash
root@00cbdb363500:/# ls /var/lib/mysql
auto.cnf client-key.pem ibdata1 private_key.pem sys
ca-key.pem ib_buffer_pool ibtmp1 public_key.pem test
~]# docker container prune -f
~]# docker volume prune –f
~]# docker volume ls
DRIVER VOLUME NAME
local dffe3dbb73fd6948fc557380b61ca2459b9d410707287a37d1742bf6564a3669


创建卷并挂载
– 注意：这里没有暴露端口到主机！
– 将自己定义的数据卷挂载在 /var/lib/mysql
• 启动客户端容器链接服务器
– 注意：这里使用了 --link 连接两个容器
– 客户端容器内可以使用 mysql 这个别名访问服务器
~]# docker rm $(docker ps -a -q) -f -v
~]# docker volume create mydb
~]# docker run --name mysql2 -e MYSQL_ROOT_PASSWORD=root -v mydb:/var/lib/mysql -d mysql:5.7
~]# docker run --name myclient --link mysql2:mysql -it mysql:5.7 bash
root@768d01904d4e:/# env
…
root@768d01904d4e:/# mysql -hmysql -P3306 -uroot -proot