The first course of the Docker

Docker command:

docker images 查看本机所有镜像
docker pull NAME 从仓库下载镜像
docker run [-d -p 8080:80] or [-P] NAME 启动镜像（-d 后台运行 -p 端口映射 -P 随机映射）
docker exec [-i -t] NAME bash 进入容器并执行bash
docker ps 查看后台容器
docker stop ID 停止docker容器
docker restart ID 重启容器

Docker netowrk type: bridge

Docker port map: host(eth0:80) <–> dicker0(bridge) <–> docker container(eth0:80)

Build Docker

Dockerfile
docker build [-t] 建立Docker，指定TAG

A Dcokerfile example (based tomcat):

from tomcat 
MAINTAINER ewan ewanlee@yeah.net
COPY jpress-web-newest.war /usr/local/tomcat/webapps

搭建第一个Web app

为了介绍方便，所以使用了开源的java实现的wordpress，也就是Jpress

[1]下载相应的war包，并存到工作目录下

[2]下载一个tomcat的Docker镜像docker pull tomcat

Using default tag: latest
latest: Pulling from library/tomcat
cd0a524342ef: Pull complete 
e39c3ffe4133: Pull complete 
aac3320edf40: Pull complete 
4d9e109682f7: Pull complete 
0a59efcf9553: Pull complete 
43a404e523e0: Pull complete 
806f07b1dce8: Pull complete 
0cad96dccb4c: Pull complete 
04073e2a9145: Pull complete 
d9e4bf4be89c: Pull complete 
739005fdecc9: Pull complete 
8bd03d99f1b2: Pull complete 
d586afbd7622: Pull complete 
Digest: sha256:88483873b279aaea5ced002c98dde04555584b66de29797a4476d5e94874e6de
Status: Downloaded newer image for tomcat:latest

[3]写一个Dockerfile，也就是之前的example

[4]建立镜像docker build -t jpress:latest .

结果如下：

Sending build context to Docker daemon  20.8 MB
Step 1 : FROM tomcat
 ---> d71978506e58
Step 2 : MAINTAINER ewan ewanlee@yeah.net
 ---> Running in dfa1902d1ea4
 ---> 956612ba6987
Removing intermediate container dfa1902d1ea4
Step 3 : COPY jpress-web-newest.war /usr/local/tomcat/webapps
 ---> dd6eecd741e7
Removing intermediate container 1fe7f943071b
Successfully built dd6eecd741e7

[5]下载一个mysql的docker镜像docker pull mysql

Using default tag: latest
latest: Pulling from library/mysql
cd0a524342ef: Already exists 
d9c95f06c17e: Pull complete 
46b2d578f59a: Pull complete 
10fbc2bcc6e9: Pull complete 
91b1a29c3956: Pull complete 
5bf9316bd602: Pull complete 
69bd23f08b55: Pull complete 
4fb778132e94: Pull complete 
6913628d7744: Pull complete 
a477f36dc2e0: Pull complete 
c954124ae935: Pull complete 
Digest: sha256:e44b9a3ae88db013a3e8571a89998678ba44676ed4ae9f54714fd31e108f8b58
Status: Downloaded newer image for mysql:latest

[6]运行mysql并创建一个数据库