如何删除群中未使用的docker镜像? [英] How to delete unused docker images in swarm?

问题描述

我们有一个系统，用户可以在其中安装一些Docker容器.我们对他可以安装的东西没有限制.一段时间后，我们需要清理-删除群集中所有未使用的图像.

We have a system where user may install some docker containers. We dont have a limit on what he can install. After some time, we need to clean up - delete all the images that are not in used in the swarm.

使用docker远程API的解决方案是什么?

What would be the solution for that using docker remote API?

我们的想法是让背景图像垃圾收集器线程:

Our idea is to have background image-garbage-collector thread that:

• 列出所有图像
• 尝试删除一些内容
• 如果失败，请忽略

这有意义吗?这会以某种方式影响蜂群吗?

Would this make sense? Would this affect swarm somehow?

推荐答案

更清晰的列出和(尝试)删除所有图像的方式

命令 docker rmi $(docker images -q)与@tpbowden的回答相同，但方式更简洁. -q | --quiet 仅列出图像ID.

Cleaner way to list and (try to) remove all images

The command docker rmi $(docker images -q) would do the same as the answer by @tpbowden but in a cleaner way. The -q|--quiet only list the images ID.

如果执行此操作，则当用户尝试 swarm运行delete-image 时，它将:

If you do this, when the user will try to swarm run deleted-image it will:

1. 拉图像(<在此处插入网络消耗警告)
2. 如果我没记错的话，只是阻塞即可，因为拉动动作不是自动进行的(<在此处插入频繁的支持请求警告，以免误解了Swarm行为/> ).

"dangling = true"过滤器:

一个有用的选项是-过滤器"dangling = true" .执行 swarm images -q --filter"dangling = true" 将显示当前未运行的图像.

"dangling=true" filter:

A useful option is the --filter "dangling=true". Executing swarm images -q --filter "dangling=true" will display not-currently-running images.

您发出的问题使我想起了计算机中的内存管理.您的真正问题是:

You issue reminds me the memory management in a computer. Your real issue is:

如何删除将来不再使用的图像?

How to remove image that won't be used in the future?

这真的很难，实际上取决于您的政策.如果您的政策是要删除旧映像，那么可能有用的命令是: docker images --format ='{{.CreatedSince}}:{{.ID}}'.但是随后黑客开始...您可能需要 grep"months" ，然后 cut -d':'-f 2 .

Which is really hard and really depends on your policy. If your policy is old images are to be deleted the command that could help is: docker images --format='{{.CreatedSince}}:{{ .ID}}'. But then the hack starts... You may need to grep "months" and then cut -d ':' -f 2.

整个命令的结果为:

docker rmi $(docker images --format='{{.CreatedSince}}:{{ .ID}}' G months | cut -d ':' -f 2)

请注意，此命令将需要在每个Swarm代理以及Swarm管理器上运行，而不是仅在Swarm管理器上运行.

Note that this command will need to be run on every Swarm agent as well as the Swarm manager, not only the Swarm manager.

请注意，拉动图像:标记 不会在Swarm代理上拉动图像！每个Swarm代理必须自己拉映像.因此，删除仍然使用的图像将导致网络负载.

Be aware than a swarm pull image:tag will not pull the image on Swarm agents! Each Swarm agent must pull the image itself. Thus deleting still used images will result in network load.

我希望这个答案会有所帮助.目前无法查询"一个月以来未使用的图像" AFAIK.

I hope this answer helps. At this time there is no mean to query "image not used since a month" AFAIK.

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