docker下images操作
获取docker的images# docker pull centos
latest: Pulling from docker.io/centos
f1b10cd84249: Pull complete
c852f6d61e65: Pull complete
7322fbe74aa5: Pull complete
Digest: sha256:90305c9112250c7e3746425477f1c4ef112b03b4abe78c612e092037bfecc3b7
Status: Downloaded newer image for docker.io/centos:latest
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
docker.io/centos latest 7322fbe74aa5 8 weeks ago 172.2 MB 搜索images
# docker search sinatra
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/tdiary/rpaproxy-sinatra 1
docker.io docker.io/andyshinn/sinatra-echo 0
docker.io docker.io/antonyfrancis/sinatra-org 0
docker.io docker.io/crohr/docker-sinatra 0
docker.io docker.io/davidyoondrums/sinatra-skeleton 0
docker.io docker.io/erikap/ruby-sinatra Docker for hosting Sinatra apps 0
docker.io docker.io/garland/sinatra-hello 0
docker.io docker.io/gwjjeff/sinatra 0
docker.io docker.io/hacker314159/ruby-sinatra 0
docker.io docker.io/kerona/sinatra 0
docker.io docker.io/kklepper/sinatra_debian 0
docker.io docker.io/larmar/sinatra-puppet 0
docker.io docker.io/llamashoes/docker-sinatra 0
docker.io docker.io/llamashoes/k8s-example-sinatra 0
docker.io docker.io/luisbebop/docker-sinatra-hello-world 0
docker.io docker.io/marceldegraaf/sinatra Sinatra test app 0
docker.io docker.io/mattwarren/docker-sinatra-demo 0
docker.io docker.io/ryotarai/hello-sinatra 0
docker.io docker.io/shangaijun/sinatra 0
docker.io docker.io/shaoheshan/sinatra 0
docker.io docker.io/synctree/sinatra-echo 0
docker.io docker.io/waitingkuo/benchrock-sinatra 0
docker.io docker.io/windurst/sinatra 0
docker.io docker.io/yoheimuta/docker-sinatra 0
docker.io docker.io/zoomix/sinatra-galleria 0 下载training/sinatra，并运行容器
# docker pull training/sinatra
Trying to pull repository docker.io/training/sinatra ...
f0f4ab557f95: Download complete
511136ea3c5a: Download complete
3e76c0a80540: Download complete
be88c4c27e80: Download complete
bfab314f3b76: Download complete
e809f156dc98: Download complete
ce80548340bb: Download complete
79e6bf39f993: Download complete
Status: Downloaded newer image for docker.io/training/sinatra:latest
# docker run -t -i training/sinatra /bin/bash
root@01411ac9a0c4:/# hostname
01411ac9a0c4
root@01411ac9a0c4:/# ping baidu.com
PING baidu.com (123.125.114.144) 56(84) bytes of data.
64 bytes from 123.125.114.144: icmp_seq=1 ttl=50 time=180 ms
64 bytes from 123.125.114.144: icmp_seq=2 ttl=50 time=183 ms
^C
--- baidu.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 180.772/182.024/183.276/1.252 ms 创建自己的container
方法一：使用docker commit来创建新的container
root@01411ac9a0c4:/# gem install json
# docker commit -m "add json gem" -a='lyao' 01411ac9a0c4 ouruser/sinatra:v2
4d5493c04338a17a8026842f8b3b2a5a5ac9fed74616eaafc2bd66dc9205f379
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
ouruser/sinatra v2 4d5493c04338 5 seconds ago 451.9 MB
docker.io/centos latest 7322fbe74aa5 8 weeks ago 172.2 MB
docker.io/training/sinatra latest f0f4ab557f95 14 months ago 446.8 MB -m来指定提交的信息，跟我们使用的版本控制工具一样。
-a可以指定我们更新的用户信息指定我们要从哪个容器 ID 来创建我们的副本，最后指定目标 image
的名字。
这个例子里面，我们指定了一个新用户， ouruser ，使用了 sinatra 的 image ，最后指定了 image 的
标记 v2 。
方法二：使用dockerfile来创建container
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