docker实现重新打tag并删除原tag的镜像（docker 删除镜像标签）

docker镜像id是唯一的，可以物理性的标明一个镜像，repository：tag可以有多个，但是也不会重复，也是唯一的。

要重新打tag的话，语法是：

docker tag imageId repository:newTag

比如将这个centos：7重新打tag为centos7：base

此时仓库中有两个镜像，镜像id相同，只是多了一个tag标签，也就是多了一个引用。删除不需要的引用即可，删除时必须用tag删除，用镜像id删除会物理性的删除镜像，这两个引用会同时被删除掉。

当然，打tag的时候也可以使用这样的语法：

docker tag repository:tag repository:newTag

补充知识：docker遇到问题一：同一镜像有多个Tag情况下，执行 docker rmi 镜像ID 指令无法删除

镜像列表

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE runoob/centos 6.7 4994f1f799c7 2 days ago 191MB runoob/centos dev 4994f1f799c7 2 days ago 191MB tomcat latest da0729cd9201 2 days ago 463MB

删除镜像

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi 4994f1f799c7 Error response from daemon: conflict: unable to delete 4994f1f799c7 (must be forced) - image is referenced in multiple repositories

删除方法一

docker rmi -f 镜像ID

如下所示：

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi -f 4994f1f799c7 Untagged: runoob/centos:6.7 Deleted: sha256:4994f1f799c7c9241c23055ecc7335c074caaa96243dcc665d1c1836216c34f2 Deleted: sha256:6829bdaf30b11efab68c0ae473690ae1637830a560487ce07ad08988484c0987 Deleted: sha256:fd54ea270ce8e890023eaba2a72eff187d27f71f3ffea9e11e9684de8ac9606a Deleted: sha256:ece17abd46a222b2fa35f1e18a981092605453c258dceca6919e3572ab4f1fbf Deleted: sha256:b59b8f6f9d682eeb94a3628fded0325e9d43664fdd26651971a6fc4bd34bc3ca Deleted: sha256:71c39bd52e1858772c19aac2b18203dca9a02f6a07a4cef54099ecd14734da83 Deleted: sha256:6ff1dc40fd96eebca0785a047794a83f3c954e4949c350fbd0661ed0f7ed8c96 Deleted: sha256:19efa1023a08e6d4014cea1821fe9f3b169eed3c11397460fb19db1d22b69fb2 Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE tomcat latest da0729cd9201 2 days ago 463MB

docker rmi : 删除本地一个或多少镜像。

语法

docker rmi [OPTIONS] IMAGE [IMAGE…]

OPTIONS说明：

-f : 强制删除；

–no-prune : 不移除该镜像的过程镜像，默认移除；

删除方法二

docker rmi repository:tag

如下所示：

Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi runoob/centos:dev Untagged: runoob/centos:dev Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE runoob/centos 6.7 4994f1f799c7 2 days ago 191MB tomcat latest da0729cd9201 2 days ago 463MB Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker rmi runoob/centos:6.7 Untagged: runoob/centos:6.7 Cappuccinooos-MacBook-Pro:.docker Cappuccinooo$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE tomcat latest da0729cd9201 2 days ago 463MB