首先拉取一个镜像，在这里以NGINX为例
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[root@DockServer opt]
# docker pull nginx
[root@DockServer opt]
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest b8efb18f159b 3 weeks ago 107MB
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启动NGINX镜像，映射出端口
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[root@DockServer opt]
# docker run --name webserver -d -p 80:80 nginx
8f62585b370ca34eb8c438adbab0f972e1990cee25000a742c6a2d8e7ee7ba38
[root@DockServer opt]
# 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
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访问端口，直接用命令行访问，
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[root@DockServer opt]
# 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
>
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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
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进入docker
[root@DockServer opt]
# docker exec -it webserver bash
root@8f62585b370c:/
# echo '<h1>Hello, Docker!</h1>' > /usr/share/nginx/html/index.html
root@8f62585b370c:/
# exit
exit
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再次访问看看
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[root@DockServer opt]
# curl http://127.0.0.1
<h1>Hello, Docker!<
/h1
>
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可以看出，已经修改成功，我们保存成镜像
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[root@DockServer opt]
# docker commit --author "Ding Jin <dingjin@gmail.com>" --message "修改nginx默认网页" webserver webserver:v2
sha256:ca35d11b57bac6e3e4ebab15aaff528c8530f7f5e59e00f58fa61e86edf1aa91
[root@DockServer opt]
# 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
[root@DockServer opt]
# docker run --name web2 -d -p 81:80 webserver:v2
1647edeba49aa664c0ccf642248f6b30b36c6b08990ede580a5803f1a59ae545
[root@DockServer opt]
# curl http://127.0.0.1:81
<h1>Hello, Docker!<
/h1
>
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可以了解以下命令，
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查看webserver做了哪些更改，即和源镜像对比不同
[root@DockServer opt]
# 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
[root@DockServer opt]
# 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 [SIGTERM] 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
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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~~
本文转自 jackjiaxiong 51CTO博客，原文链接:http://blog.51cto.com/xiangcun168/1957431
