如何解決 image has dependent child images 錯誤
問題
在 Docker 中刪除 image 時有時會遇到類似
Error response from daemon: conflict: unable to delete 6ec9a5a0fc9f (cannot be forced) - image has dependent child images
這樣的錯誤，原因是有另外的 image FROM 了這個 image，可以使用下面的命令列出所有在指定 image 之后創建的 image 的父 image
docker image inspect --format='{{.RepoTags}} {{.Id}} {{.Parent}}' $(docker image ls -q --filter since=xxxxxx)
其中 xxxxxx 是報錯 image 的 id，在文章開頭的例子中就是 6ec9a5a0fc9f。從列表中查找到之后就可以核對并刪除這些 image。
示例
1、查看我的鏡像列表。
? ~ docker images -a
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> b707620d204c 8 hours ago 179MB
tingfeng/dockerfile_build_demo latest 6586e000b464 8 hours ago 179MB
<none> <none> 54f305491871 10 hours ago 122MB
<none> <none> 97ea9f11c94f 10 hours ago 81.2MB
tingfeng/commit_test latest 58fac7144497 31 hours ago 234MB
tomcat latest 61205f6444f9 2 weeks ago 467MB
ubuntu latest 113a43faa138 2 weeks ago 81.2MB
nginx latest cd5239a0906a 2 weeks ago 109MB
hello-world latest e38bc07ac18e 2 months ago 1.85kB
2、刪除none的鏡像（刪不掉）
? ~ docker rmi b707620d204c
Error response from daemon: conflict: unable to delete b707620d204c (cannot be forced) - image has dependent child images
? ~ docker rmi 97ea9f11c94f
Error response from daemon: conflict: unable to delete 97ea9f11c94f (cannot be forced) - image has dependent child images
? ~ docker rmi -f 54f305491871
Error response from daemon: conflict: unable to delete 54f305491871 (cannot be forced) - image has dependent child images
3、查找出所有在指定 image 之后創建的 image 的父 image，本示例看得出是同一個依賴鏡像 tingfeng/dockerfile_build_demo
? ~ docker image inspect --format='{{.RepoTags}} {{.Id}} {{.Parent}}' $(docker image ls -q --filter since=b707620d204c)
[tingfeng/dockerfile_build_demo:latest] sha256:6586e000b464654f420b0aa9cf6c3c61cc29edfbbe7cc5cb5d6e0fe037efaf87 sha256:b707620d204ca475f13394b14614e1f2fde986931c925cd8cc8e8bb3de7debe3
? ~ docker image inspect --format='{{.RepoTags}} {{.Id}} {{.Parent}}' $(docker image ls -q --filter since=54f305491871)
[tingfeng/dockerfile_build_demo:latest] sha256:6586e000b464654f420b0aa9cf6c3c61cc29edfbbe7cc5cb5d6e0fe037efaf87 sha256:b707620d204ca475f13394b14614e1f2fde986931c925cd8cc8e8bb3de7debe3
? ~ docker image inspect --format='{{.RepoTags}} {{.Id}} {{.Parent}}' $(docker image ls -q --filter since=97ea9f11c94f)
[tingfeng/dockerfile_build_demo:latest] sha256:6586e000b464654f420b0aa9cf6c3c61cc29edfbbe7cc5cb5d6e0fe037efaf87 sha256:b707620d204ca475f13394b14614e1f2fde986931c925cd8cc8e8bb3de7debe3
4、刪除關聯的依賴鏡像，關聯的none鏡像也會被刪除
? ~ docker rmi 6586e000b464
Untagged: tingfeng/dockerfile_build_demo:latest
Deleted: sha256:6586e000b464654f420b0aa9cf6c3c61cc29edfbbe7cc5cb5d6e0fe037efaf87
Deleted: sha256:b707620d204ca475f13394b14614e1f2fde986931c925cd8cc8e8bb3de7debe3
Deleted: sha256:c241c7f781a3176d395b38a7e96eb2e0b7e031e622ad9d14eaa9098de1a063d1
Deleted: sha256:54f305491871f5609295cd6c59f304401761c7fa96bdda8a74968358c54ba402
Deleted: sha256:be4d80c4407bde1fe700983ad805a0237a148d7af04e8bf2197fc040ae654acb
Deleted: sha256:97ea9f11c94fb8f76288361e37f884d639c6ea918bc6142feee2409e7ff43791
5、再次查看鏡像列表
? ~ docker images -a
REPOSITORY TAG IMAGE ID CREATED SIZE
tingfeng/commit_test latest 58fac7144497 31 hours ago 234MB
tomcat latest 61205f6444f9 2 weeks ago 467MB
ubuntu latest 113a43faa138 2 weeks ago 81.2MB
nginx latest cd5239a0906a 2 weeks ago 109MB
hello-world latest e38bc07ac18e 2 months ago 1.85kB
其他操作
# 停止所有容器
? ~ docker ps -a | grep "Exited" | awk '{print $1 }'|xargs docker stop
# 刪除所有容器
? ~ docker ps -a | grep "Exited" | awk '{print $1 }'|xargs docker rm
# 刪除所有none容器
? ~ docker images|grep none|awk '{print $3 }'|xargs docker rmi
相關閱讀
刪除docker-register的鏡像& none無效鏡像講解：https://segmentfault.com/a/1190000011153919
