[Docker]Dockerfile指令

COPY

COPY <源路径> <目标路径>

ADD

ADD <源路径> <目标路径> 同COPY带解压缩功能，不推荐使用

CMD

• 启动脚本 只允许使用一次 CMD ./startup.sh

• 只允许使用一次，多个CMD只执行最后一条
  CMD ./startup.sh
  CMD systemctl start mysql

ENTRYPOINT

<ENTRYPOINT> "<CMD>"

• 只允许使用一次
  CMD ./startup.sh
  ENTRYPOINT serviceup.sh

systemctl start mysql
systemctl start redis

ENV

ENV <key> <value>

ENV MYSQL_VERSION 5.7.22

EXPOSE

端口暴露

FROM tomcat
MySQL 3306

EXPOSE 8080 3306

WORKDIR

像cd

FROM tomcat
# 执行删除命令
RUN rm -rf /usr/local/tomcat/webapps/ROOT/*
# 复制到指定目录
COPY myshop.tar.gz /usr/local/tomcat/webapps/ROOT/
# 指定工作目录
WORKDIR /usr/local/tomcat/webapps/ROOT/
# 解压并删除
RUN tar -zxvf myshop.tar.gz \
    && rm -rf myshop.tar.gz
# 暴露端口
EXPOSE 8080

创建容器镜像

[root@Proxy myshop]# docker build -t myshop .
Sending build context to Docker daemon  3.072kB
Step 1/6 : FROM tomcat
 ---> 31a47677561a
Step 2/6 : RUN rm -rf /usr/local/tomcat/webapps/ROOT/*
 ---> Running in 9e79795e9561
Removing intermediate container 9e79795e9561
 ---> 8f8e7a6f0311
Step 3/6 : COPY myshop.tar.gz /usr/local/tomcat/webapps/ROOT/
 ---> 698409b80c1c
Step 4/6 : WORKDIR /usr/local/tomcat/webapps/ROOT/
 ---> Running in cdd76a252311
Removing intermediate container cdd76a252311
 ---> 36de8e85e9f7
Step 5/6 : RUN tar -zxvf myshop.tar.gz     && rm -rf myshop.tar.gz
 ---> Running in f938c18130e7
index.jsp
Removing intermediate container f938c18130e7
 ---> 32412a868e90
Step 6/6 : EXPOSE 8080
 ---> Running in b15b8be8779b
Removing intermediate container b15b8be8779b
 ---> efd695e46c39
Successfully built efd695e46c39
Successfully tagged myshop:latest

运行容器

[root@Proxy myshop]# docker run -p 8080:8080 --name myshop -d myshop
4531078fec2e6991dea847bc8ff8166cefc7a0ce76c0304aff8668c6fd474312

WORKDIR工作目录

[root@Proxy myshop]# docker exec -it myshop /bin/bash
root@4531078fec2e:/usr/local/tomcat/webapps/ROOT#