Dockerfile中CMD和ENTRYPOINT的组合用法
2017-07-02 11:13
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Dockerfile中CMD和ENTRYPOINT的组合用法
root@ubuntu:/dockerfile/df_test5# pwd
/dockerfile/df_test5
root@ubuntu:/dockerfile/df_test5#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"]
CMD ["-h"]
root@ubuntu:/dockerfile/df_test5#
root@ubuntu:/dockerfile/df_test5#docker build -t="df_test5" .
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;
--->Using cache
--->112ebc020e4e
Step 6 : CMD -h
--->Running in 94961f2569d4
--->e88d8bf0d386
Removing intermediate container 94961f2569d4
Successfully built e88d8bf0d386
root@ubuntu:/dockerfile/df_test5#
root@ubuntu:/dockerfile/df_test5# docker run -p 80-d --name ep_test2 df_test5
-g"daemon off;"
d97c51eb835e71add8787469c0b169b0a6329fee2060089a72107f8b62174036
root@ubuntu:/dockerfile/df_test5#
root@ubuntu:/dockerfile/df_test5#docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d97c51eb835e df_test5:latest "/usr/sbin/nginx -g 6seconds ago Up 5 seconds 0.0.0.0:32777->80/tcp ep_test2
root@ubuntu:/dockerfile/df_test5#curl http://127.0.0.1:32777
root@ubuntu:/dockerfile/df_test5#
说明:
1)-g "daemon off;"把CMD的命令给覆盖了;
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