docker学习笔记（三）——创建自定义镜像
首先拉取一个镜像，在这里以NGINX为例# docker pull nginx
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest b8efb18f159b 3 weeks ago 107MB 启动NGINX镜像，映射出端口
# docker run --name webserver -d -p 80:80 nginx
8f62585b370ca34eb8c438adbab0f972e1990cee25000a742c6a2d8e7ee7ba38
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8f62585b370c nginx "nginx -g 'daemon ..." 6 seconds ago Up 6 seconds 0.0.0.0:80->80/tcp webserver 访问端口，直接用命令行访问，
# curl http://127.0.0.1
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html> 可以看到能够访问在nginx docker里的东东了，下面我们修改下首页内容
进入nginx docker 里面进行修改
进入docker
# docker exec -it webserver bash
root@8f62585b370c:/# echo '<h1>Hello, Docker!</h1>' > /usr/share/nginx/html/index.html
root@8f62585b370c:/#exit
exit 再次访问看看
# curl http://127.0.0.1
<h1>Hello, Docker!</h1> 可以看出，已经修改成功，我们保存成镜像
# docker commit--author "Ding Jin <dingjin@gmail.com>"--message "修改nginx默认网页"webserver webserver:v2
sha256:ca35d11b57bac6e3e4ebab15aaff528c8530f7f5e59e00f58fa61e86edf1aa91
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
webserver v2 ca35d11b57ba 6 seconds ago 107MB
nginx latest b8efb18f159b 3 weeks ago 107MB
已经可以看到webserver:v2镜像了，运行下
# docker run --name web2 -d -p 81:80 webserver:v2
1647edeba49aa664c0ccf642248f6b30b36c6b08990ede580a5803f1a59ae545
# curl http://127.0.0.1:81
<h1>Hello, Docker!</h1> 可以了解以下命令，
查看webserver做了哪些更改，即和源镜像对比不同
# docker diff webserver
C /root
A /root/.bash_history
C /run
A /run/nginx.pid
C /var
C /var/cache
C /var/cache/nginx
A /var/cache/nginx/uwsgi_temp
A /var/cache/nginx/client_temp
A /var/cache/nginx/fastcgi_temp
A /var/cache/nginx/proxy_temp
A /var/cache/nginx/scgi_temp
C /usr
C /usr/share
C /usr/share/nginx
C /usr/share/nginx/html
查看webserver:v2历史文件变动记录
# docker history webserver:v2
IMAGE CREATED CREATED BY SIZE COMMENT
ca35d11b57ba 4 minutes ago nginx -g daemon off; 98B 修改nginx默认网页
b8efb18f159b 3 weeks ago /bin/sh -c #(nop)CMD ["nginx" "-g" "daem... 0B
<missing> 3 weeks ago /bin/sh -c #(nop)STOPSIGNAL 0B
<missing> 3 weeks ago /bin/sh -c #(nop)EXPOSE 80/tcp 0B
<missing> 3 weeks ago /bin/sh -c ln -sf /dev/stdout /var/log/ngi... 0B
<missing> 3 weeks ago /bin/sh -c apt-get update&& apt-get inst... 52.2MB
<missing> 3 weeks ago /bin/sh -c #(nop)ENV NJS_VERSION=1.13.3.... 0B
<missing> 3 weeks ago /bin/sh -c #(nop)ENV NGINX_VERSION=1.13.... 0B
<missing> 3 weeks ago /bin/sh -c #(nop)MAINTAINER NGINX Docker... 0B
<missing> 3 weeks ago /bin/sh -c #(nop)CMD ["bash"] 0B
<missing> 3 weeks ago /bin/sh -c #(nop) ADD file:fa8dd9a679f473a... 55.2MB 结合上篇，我们上传到本地私有仓库，然后就直接可以在本地调用了~~
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