本文主要是介绍Dockerfile中ENTRYPOINT的用法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
root@ubuntu:~# cd /dockerfile/df_test4/
root@ubuntu:/dockerfile/df_test4# vim Dockerfile
root@ubuntu:/dockerfile/df_test4#cat Dockerfile
# 设置基本的镜像，后续命令都以这个镜像为基础
FROM ubuntu
# 作者信息
MAINTAINER shangwu
# RUN命令会在上面指定的镜像里执行任何命令
RUN apt-get update
RUN apt-get install -y nginx
#暴露ssh端口
EXPOSE 80
ENTRYPOINT ["/usr/sbin/nginx","-g", "daemon off;"]
root@ubuntu:/dockerfile/df_test4#
root@ubuntu:/dockerfile/df_test4#docker build -t="df_test4" .
Sending build context to Docker daemon 2.048 kB
Sending build context to Docker daemon
Step 0 : FROM ubuntu
--->dc8dd8718e57
Step 1 : MAINTAINER shangwu
--->Using cache
--->cd3d00722426
Step 2 : RUN apt-get update
--->Using cache
--->0096fe9ac7c4
Step 3 : RUN apt-get install -y nginx
--->Using cache
--->c8b93cc747d7
Step 4 : EXPOSE 80
--->Using cache
--->266559c6bc7f
Step 5 :ENTRYPOINT /usr/sbin/nginx -g daemon off;
--->Running in ff1c83947cd7
--->112ebc020e4e
Removing intermediate container ff1c83947cd7
Successfully built 112ebc020e4e
root@ubuntu:/dockerfile/df_test4#
root@ubuntu:/dockerfile/df_test4#docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
df_test4 latest 112ebc020e4e 14 seconds ago 214.3 MB
df_test3 latest ea94d0b70edb 41 minutes ago 214.3 MB
df_test2 latest 33bc74414c04 About an hour ago 214.3 MB
ubuntu-nginx-df_test2 latest 266559c6bc7f 9 hours ago 214.3 MB
ubuntu-nginx v1 8377a82bd88d 9 hours ago 232.8 MB
ubuntu latest dc8dd8718e57 10 days ago 119.2 MB
root@ubuntu:/dockerfile/df_test4#docker run -p 80 -d --name ep_test1 df_test4 /bin/bash
8fc88f1f1ec1711528087a518c68460a2222f753d011ae1be3208b44b9ee5e0b
root@ubuntu:/dockerfile/df_test4#docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8fc88f1f1ec1 df_test4:latest "/usr/sbin/nginx -g 5seconds ago Exited (1) 5 secondsago ep_test1
root@ubuntu:/dockerfile/df_test4#
说明：
1）可以看到/bin/bash命令没有覆盖ENTRYPOINT中的命令；
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