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27_尚硅谷_Docker_DockerFile案例-ONBUILD命令案例

发布时间：2022-11-13 19:26:39编辑：雪饮阅读（）

onbuild是在某个镜像被其它镜像from后然后build时候触发的。

构建父类DockerFile：

[root@localhost mydocker]# cat DockerFile5

from centos:centos7

run yum install -y curl

entrypoint ["curl","-i","www.baidu.com"]

onbuild run echo "my onbuild is runing"

父类镜像构建

docker build -f /root/mydocker/DockerFile5 -t centos75 .

构建子类DockerFile：

[root@localhost mydocker]# cat DockerFile6

from centos75

run yum install -y curl

entrypoint ["curl","-i","www.baidu.com"]

构建子类镜像

[root@localhost mydocker]# docker build -f /root/mydocker/DockerFile6 -t centos76 .

Sending build context to Docker daemon  7.168kB

Step 1/3 : from centos75

# Executing 1 build trigger

 ---> Running in abed4767248d

my onbuild is runing

Removing intermediate container abed4767248d

 ---> 8f11e99ff055

Step 2/3 : run yum install -y curl

 ---> Running in 4893fcf71bd7

Loaded plugins: fastestmirror, ovl

Loading mirror speeds from cached hostfile

 * base: mirrors.ustc.edu.cn

 * extras: mirrors.163.com

 * updates: mirrors.163.com

Package curl-7.29.0-59.el7_9.1.x86_64 already installed and latest version

Nothing to do

Removing intermediate container 4893fcf71bd7

 ---> b1b3f0a7bdee

Step 3/3 : entrypoint ["curl","-i","www.baidu.com"]

 ---> Running in df32eee13d0f

Removing intermediate container df32eee13d0f

 ---> decce64298b6

Successfully built decce64298b6

Successfully tagged centos76:latest