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在Docker使用中，经常会碰到删除镜像不成功，反而让镜像变成了<none > <none>即，没名字，没Tag的镜像。
root@iZ28ikebrg6Z:/var/run# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE <none> <none> def2e0b08cbc About an hour ago 1.37 GB sameersbn/redmine latest f0bec095f291 2 hours ago 614.6 MB sameersbn/gitlab latest bf5c375d9057 3 days ago 635.1 MB <none> <none> 9cbaf023786c 3 days ago 192.8 MB sameersbn/postgresql latest 24a6064fa4cd 10 days ago 142.1 MB <none> <none> 48648094d099 5 weeks ago 997.9 MB <none> <none> 195fa62e92a8 6 weeks ago 496.4 MB training/webapp latest 31fa814ba25a 4 months ago 278.8 MB sameersbn/redmine 2.4.2 b95b8046d47c 8 months ago 1.327 GB
好多<none>，删又删不了。这主要是一些container使用了该image导致的，不仅仅是说现在运行的容器，之前运行的也会。
docker ps -a
可以查历史记录，然后将container commit成镜像。
我们需要删除这些依赖Image的container，当使用到该镜像的所有container都删除了，就可以直接用IMAGE_ID来删除该镜像。
root@iZ28ikebrg6Z:/var/run# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 5d6373cb79e6 224b40d4b89f "/bin/sh -c 'apt-get 25 hours ago Exited (0) 25 hours ago distracted_blackwell aa47ba8e71c8 training/webapp:latest "python app.py" 28 hours ago Exited (-1) 27 hours ago suspicious_ardinghelli 09792841c0b4 training/webapp:latest "python app.py" 29 hours ago Exited (-1) 27 hours ago compassionate_torvalds d8eca9742031 9cbaf023786c "/bin/sh -c 'while t 31 hours ago Exited (-1) 30 hours ago mad_jones 95d20e5442f9 9cbaf023786c "/bin/bash" 31 hours ago Exited (0) 31 hours ago stupefied_torvalds 9d40292642e6 9cbaf023786c "/bin/echo 'hello wo 31 hours ago Exited (0) 31 hours ago stoic_mclean 1078d5bd868e 9cbaf023786c "/bin/echo 'hello wo 31 hours ago Exited (0) 31 hours ago high_leakey e88cad8893f5 9cbaf023786c "/bin/echo hello" 31 hours ago Exited (0) 31 hours ago compassionate_mclean 0949d7b6148d 9cbaf023786c "/bin/echo 'hello wo 31 hours ago Exited (0) 31 hours ago romantic_carson e5ab0f35322f 9cbaf023786c "/bin/bash" 31 hours ago Exited (0) 31 hours ago romantic_elion 9fbad8b573d3 9cbaf023786c "/bin/bash" 32 hours ago Exited (0) 31 hours ago thirsty_davinci 9ce1789ee43d 9cbaf023786c "/bin/echo hello" 32 hours ago Exited (0) 32 hours ago insane_colden
一个个的删除
root@iZ28ikebrg6Z:/var/run# docker rm 5d63 5d63 root@iZ28ikebrg6Z:/var/run# docker rm aa47 aa47 root@iZ28ikebrg6Z:/var/run# docker rm 0979 0979 root@iZ28ikebrg6Z:/var/run# docker rm d8ec d8ec root@iZ28ikebrg6Z:/var/run# docker rm 95d 95d root@iZ28ikebrg6Z:/var/run# docker rm 9d4 9d4 root@iZ28ikebrg6Z:/var/run# docker rm 1078 1078 root@iZ28ikebrg6Z:/var/run# docker rm e88c e88c root@iZ28ikebrg6Z:/var/run# docker rm 0949 0949 root@iZ28ikebrg6Z:/var/run# docker rm e5ab e5ab root@iZ28ikebrg6Z:/var/run# docker rm 9fba 9fba root@iZ28ikebrg6Z:/var/run# docker rm 9ce1 9ce1 root@iZ28ikebrg6Z:/var/run# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
root@iZ28ikebrg6Z:/var/run# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE sameersbn/redmine latest f0bec095f291 3 hours ago 614.6 MB sameersbn/gitlab latest bf5c375d9057 3 days ago 635.1 MB sameersbn/postgresql latest 24a6064fa4cd 10 days ago 142.1 MB <none> <none> 48648094d099 5 weeks ago 997.9 MB <none> <none> 195fa62e92a8 6 weeks ago 496.4 MB training/webapp latest 31fa814ba25a 4 months ago 278.8 MB sameersbn/redmine 2.4.2 b95b8046d47c 8 months ago 1.327 GB root@iZ28ikebrg6Z:/var/run# docker rmi 4864 Deleted: 48648094d099bf7c38c5687f4cde3f2b7d27e8a1dc45c30d8fdf8e5f42c2473e Deleted: 4b1b0cd0c62c3e86701bf4bc4736ca403e3ddd264101d69110bd1924bf05ec2d Deleted: cd2308a31b296d77f1ef1562432d3908582528ed13d838a3ab6702e7d19ce604 Deleted: 212c2526444a6cefedf9d985f2727bef4b50b84062400a8f1d98b19f779baf3d Deleted: ac89032e1c4548eaf6f6bf817850431b9180a5b7f06b29e6d7f73b4b8878fe10 Deleted: dcd2c451d11f4896c31b0178c41bf764a87625004ff0048863e627474147c413 Deleted: 7eac533353c28beeab8fd4abb5a6663abc99f0cf24d3650963352f3a41ce8e29 Deleted: 11ed21fa7166f4dee1cfe406885d889f07222a458e706c9d30c28aa9e4cfc398 Deleted: cf6daa523a25b1b947138ad883d18f8501d210ae110487066a9b4ccd8fbd9c70 Deleted: 830bf73bda66fe5ac8bf9262b5be7f4cfacec7a2dd28b7d8cb61c505e68fb787 Deleted: 41176d2b465f4072fa46897aef5f4e35a1941d73a20687bb704c2bfd789a5ae3 Deleted: fa078497ab6f0be3ce013f336ff052af7eaa96cbe2e14e3e6f6352c00544ede0 Deleted: 4477fcbe8e773d2699bf50a6a24b265fbede90ab95793e9cd36f1627348424ed Deleted: 314c98eff22790bf333b9f98ff39576d9cfbeb3f380fe839ca74ef641b30d1f6 Deleted: 01fb8a54ae0821edb5d6d30280b56c47934efa05b158b67ad3a4a4bb9a82928b Deleted: 533b41917c87f1479dd6cc852cf8ad11ccd9ef93d5b42978b66bbb1bb30dd476 Deleted: b9c0b9efe68d7fe7caa1c9dcfd61a0aa4a3fb4e2629b7d10c9140a495a438855 Deleted: a91d7692121d15b5399bfb0b4096aa7d696d9e0e0b44269479e5666ea3b39dd9 Deleted: 37d36b47338de2dca6f957a520016d9e7ca4db1e57d6eb38824c9ba267b29db7 Deleted: c4ff7513909dedf4ddf3a450aea68cd817c42e698ebccf54755973576525c416 Deleted: cc58e55aa5a53b572f3b9009eb07e50989553b95a1545a27dcec830939892dba Deleted: 0ea0d582fd9027540c1f50c7f0149b237ed483d2b95ac8d107f9db5a912b4240 Deleted: d92c3c92fa73ba974eb409217bb86d8317b0727f42b73ef5a05153b729aaf96b Deleted: 9942dd43ff211ba917d03637006a83934e847c003bef900e4808be8021dca7bd Deleted: 1c9383292a8ff4c4196ff4ffa36e5ff24cb217606a8d1f471f4ad27c4690e290 root@iZ28ikebrg6Z:/var/run# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE sameersbn/redmine latest f0bec095f291 3 hours ago 614.6 MB sameersbn/gitlab latest bf5c375d9057 3 days ago 635.1 MB sameersbn/postgresql latest 24a6064fa4cd 10 days ago 142.1 MB <none> <none> 195fa62e92a8 6 weeks ago 496.4 MB training/webapp latest 31fa814ba25a 4 months ago 278.8 MB sameersbn/redmine 2.4.2 b95b8046d47c 8 months ago 1.327 GB root@iZ28ikebrg6Z:/var/run# docker rmi 195f Error response from daemon: No such image: 762df2d4d7bb52a46148cf3e5ab423b30aafd58ca8f758ea78ea2cbd1b1753b6 2014/10/17 17:26:04 Error: failed to remove one or more images root@iZ28ikebrg6Z:/var/run# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE sameersbn/redmine latest f0bec095f291 3 hours ago 614.6 MB sameersbn/gitlab latest bf5c375d9057 3 days ago 635.1 MB sameersbn/postgresql latest 24a6064fa4cd 10 days ago 142.1 MB training/webapp latest 31fa814ba25a 4 months ago 278.8 MB sameersbn/redmine 2.4.2 b95b8046d47c 8 months ago 1.327 GB root@iZ28ikebrg6Z:/var/run#好，删除干净了。还我们一个干净的工作区间。
docker的删除有两种，一个是rm 删除容器，一个是rmi删除镜像。
rm Remove one or more containers
rmi Remove one or more images
这里有两个不同的单词，images和container。其中images很好理解，跟平常使用的虚拟机的镜像一个意思，相当于一个模版，而container则是images运行时的的状态。docker对于运行过的image都保留一个状态（container），可以使用命令docker
ps来查看正在运行的container，对于已经退出的container，则可以使用docker
ps -a来查看。 如果你退出了一个container而忘记保存其中的数据，你可以使用docker
ps -a来找到对应的运行过的container使用docker commit命令将其保存为image然后运行。
回到之前的问题，由于image被某个container引用（拿来运行），如果不将这个引用的container销毁（删除），那image肯定是不能被删除。
所以想要删除运行过的images必须首先删除它的container。继续来看刚才的例子，
[yaxin@ubox ~]$docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
117843ade696 ed9c93747fe1 /bin/sh -c /usr/sbin 46 hours ago Up 46 hours 0.0.0.0:49153->22/tcp test_sshd
可以看出ed9c93747fe1的image被117843ade696的container使用着，所以必须首先删除该container
[yaxin@ubox ~]$docker rm 117843ade696
Error: container_delete: Impossible to remove a running container, please stop it first
2014/03/22 16:36:44 Error: failed to remove one or more containers
出现错误，这是因为该container正在运行中(运行docker ps查看)，先将其关闭
[yaxin@ubox ~]$docker stop 117843ade696
117843ade696
[yaxin@ubox ~]$docker rm 117843ade696
117843ade696
[yaxin@ubox ~]$docker rmi ed9c93747fe1
Deleted: ed9c93747fe16627be822ad3f7feeb8b4468200e5357877d3046aa83cc44c6af
Deleted: c8a0c19429daf73074040a14e527ad5734e70363c644f18c6815388b63eedc9b
Deleted: 95dba4c468f0e53e5f1e5d76b8581d6740aab9f59141f783f8e263ccd7cf2a8e
Deleted: c25dc743e40af6858c34375d450851bd606a70ace5d04e231a7fcc6d2ea23cc1
Deleted: 20562f5714a5ce764845119399ef75e652e23135cd5c54265ff8218b61ccbd33
Deleted: c8af1dc23af7a7aea0c25ba9b28bdee68caa8866f056e4f2aa2a5fa1bcb12693
Deleted: 38fdb2c5432e08ec6121f8dbb17e1fde17d5db4c1f149a9b702785dbf7b0f3be
Deleted: 79ca14274c80ac1df1333b89b2a41c0e0e3b91cd1b267b31bef852ceab3b2044
[yaxin@ubox ~]$docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
CentOS65 latest e55a74a32125 2 days ago 360.6 MB
可以看出，image已经被删除