27.md

虚悬镜像

[toc]

::: tip

前面讲过什么是虚悬镜像·仓库名、标签都是<none>的镜像，俗称dangling image

:::

Dockerfile写一个

from ubuntu
CMD echo 'action is success'

测试，没什么

root@ubuntu:/myfile/test# docker build .
Sending build context to Docker daemon  2.048kB
Step 1/2 : from ubuntu
 ---> ba6acccedd29
Step 2/2 : CMD echo 'action is success'
 ---> Running in 5e5d12d28ce2
Removing intermediate container 5e5d12d28ce2
 ---> 5c2d858f45c0
Successfully built 5c2d858f45c0

已经出现

查看所有虚悬镜像

root@ubuntu:/myfile/test# docker image ls -f dangling=true
REPOSITORY   TAG       IMAGE ID       CREATED              SIZE
<none>       <none>    5c2d858f45c0   About a minute ago   72.8MB
<none>       <none>    3f26da6b3168   9 minutes ago        231MB

虚悬镜像已经失去存在价值，可以删除

docker image prune