我的磁盘内存不足。
如果我运行docker images，我会得到很多结果：
app_mongodb latest 355f8f37c385 17 hours ago 568.1 MB
app_web latest a31db2244a8b 18 hours ago 868.2 MB
<none> <none> 71e586165d46 18 hours ago 568.1 MB
<none> <none> 422c281541d3 18 hours ago 568.1 MB
<none> <none> 1b16da634fa1 18 hours ago 535.4 MB
website_web latest e4442589e2f4 2 days ago 793.6 MB
<none> <none> 5445f9b915e6 3 days ago 535.4 MB
<none> <none> e825b94d5938 3 days ago 868 MB
<none> <none> ea1ddc53d17f 3 days ago 535.4 MB
<none> <none> 90531b8bd2d3 5 days ago 855.6 MB
<none> <none> 774895648397 5 days ago 535.4 MB
<none> <none> 0f474dc179c4 5 days ago 855.6 MB
<none> <none> 37cd4d180580 5 days ago 535.4 MB
<none> <none> 5f701c2e3fac 5 days ago 535.4 MB
<none> <none> 6837158ac191 5 days ago 535.4 MB
<none> <none> f3eecd70620e 5 days ago 535.4 MB
<none> <none> 27b3e1701f05 5 days ago 535.4 MB
<none> <none> 64763f09b1d4 5 days ago 535.4 MB
<none> <none> b58542e468e6 5 days ago 855.6 MB
app2_web latest 01c45018b686 5 days ago 645.5 MB
redis latest e4a35914679d 11 days ago 182.9 MB
<none> <none> 8d6737f884f8 12 days ago 854.7 MB
<none> <none> 27f7742e8b2b 2 weeks ago 792.1 MB
api_web latest 59ec56265675 2 weeks ago 906.4 MB
<none> <none> 33c328f5a271 2 weeks ago 782.2 MB
<none> <none> 53d4ad25e6c2 2 weeks ago 782.1 MB
<none> <none> 01ac14f597ba 2 weeks ago 854 MB
app3_web latest 2aaa4675cc58 3 weeks ago 929.9 MB
<none> <none> bde15910281e 3 weeks ago 789.5 MB
postgres latest ecd991538a0f 4 weeks ago 265.5 MB
app4_web latest c8b0de070d78 7 weeks ago 1.088 GB
<none> <none> 67e3ef67081b 7 weeks ago 859.2 MB
<none> <none> 451229f8dedb 7 weeks ago 859.2 MB
server_web latest 72bd5165f262 9 weeks ago 665.4 MB
<none> <none> c7f0d2b67986 9 weeks ago 660.9 MB
app5_web latest 7477b8e5ef63 3 months ago 690 MB
<none> <none> ee7de82e0cf0 3 months ago 856.7 MB
mdillon/postgis latest ee2a84576d15 3 months ago 600.2 MB
<none> <none> d8ee634a8581 4 months ago 685.3 MB
memcached latest 5fdd5c36cc9a 4 months ago 126.1 MB
app6_web latest 813fb5eac7d1 5 months ago 823.7 MB
app7_web latest 3b6a87b67359 5 months ago 645.5 MB
node argon 3b6a87b67359 5 months ago 645.5 MB
mongo latest 48b8b08dca4d 6 months ago 366.4 MB
ruby 2.2.1 aca1c061bdd2 23 months ago 775.1 MB
我知道所有命名的泊坞窗都对应什么，我可以轻松地管理它们并删除不再需要的泊坞窗。但是他们不是多数！
关于其他，我想他们是中级码头工人。
我想知道是否删除这些文件，命名文件是否会被破坏，或者仅仅是如果我重建它们（例如，使用该--no-cache选项），泊坞窗将不得不重新下载它们？（很好）
例如。基于Docker的Docker是否ruby需要启动它或仅需要构建？
These are probably images you built in the past, but then when you rebuilt the image, the relevant tag moved to another image, leaving these images untagged. Thus they show up as <none> <none>.
Looking at a sampling of your output, I'd guess a lot of them are old builds of app_mongodb:latest and app_web:latest. Based on the sizes.
app_mongodb latest 355f8f37c385 17 hours ago 568.1 MB
app_web latest a31db2244a8b 18 hours ago 868.2 MB
<none> <none> 71e586165d46 18 hours ago 568.1 MB
<none> <none> 422c281541d3 18 hours ago 568.1 MB
<none> <none> 1b16da634fa1 18 hours ago 535.4 MB
website_web latest e4442589e2f4 2 days ago 793.6 MB
<none> <none> 5445f9b915e6 3 days ago 535.4 MB
<none> <none> e825b94d5938 3 days ago 868 MB
<none> <none> ea1ddc53d17f 3 days ago 535.4 MB
<none> <none> 90531b8bd2d3 5 days ago 855.6 MB
<none> <none> 774895648397 5 days ago 535.4 MB
<none> <none> 0f474dc179c4 5 days ago 855.6 MB
<none> <none> 37cd4d180580 5 days ago 535.4 MB
<none> <none> 5f701c2e3fac 5 days ago 535.4 MB
<none> <none> 6837158ac191 5 days ago 535.4 MB
<none> <none> f3eecd70620e 5 days ago 535.4 MB
<none> <none> 27b3e1701f05 5 days ago 535.4 MB
<none> <none> 64763f09b1d4 5 days ago 535.4 MB
<none> <none> b58542e468e6 5 days ago 855.6 MB
It is most likely safe to delete them. If you try to delete them and they are being used by a container or another image, then Docker will complain about that.
在最新版本的 Docker（我相信 >= 1.13）中，您可以使用 prune 命令来清理图像或容器未引用的图像。
docker image prune
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