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                [TOC] ### 1. FROM > 基礎鏡像,當前新鏡像基于哪個鏡像為基礎 ``` # 摘自nginx dockerfile FROM debian:buster-slim ``` ### 2. MAINTAINER > 鏡像維護者的姓名和郵箱地址 ``` MAINTAINER wangking <xxx@qq.com> ``` ### 3. RUN > 容器構建時需要運行的linux命令 ``` RUN groupadd -r redis && useradd -r -g redis redis ``` ### 4. EXPOSE > 當前容器對外服務的端口 ``` EXPOSE 8080 ``` ### 5. ENV > 用來在構建鏡像過程中設置的環境變量 ``` ENV MY_PATH /var/www/ WORKDIR $MY_PATH ``` ### 6. WORKDIR > 創建容器后,終端默認登陸進來的`工作目錄`,一個落腳點 ``` WORKDIR /var/www/ ``` ### 7. ADD > 將宿主機下的文件拷貝到鏡像,并解壓縮(COPY + TAR -zxvf) ``` ADD nginx.tar.gz /usr/local ``` ### 8. COPY > > 將宿主機下的文件拷貝到鏡像 ``` COPY my.conf /etc/haha/my.conf ``` ### 9. VOLUME > 容器數據卷,用于數據保存和持久化工作 ``` VOLUME ["/data1", "/data2"] ``` ### 10. CMD > 指定一個容器啟動時要運行的命令 > 注:**dockerfile中可以有多個CMD指令,但只有最后一個生效,CMD會被docker run之后參數替換** ``` CMD cat /ect/hosts CMD ["catalina.sh", "run"] CMD ["curl", "-s", "http://ip.cn"] CMD ["/bin/bash"] ``` > docker run 參數替換 ``` # 會覆蓋dockerfile里的CMD命令 docker run -it centos /bin/bash docker run -it centos ls -l ``` ### 11. ENTRYPOINT > 指定一個容器啟動時要運行的命令,和CMD一樣可以有多個,但是不會被覆蓋,而是追加。 ``` ENTRYPOINT ["curl", "-s", "http://ip.cn"] ``` ### 12. ONBUILD > 當構建一個被繼承的dockerfile時運行的命令,父鏡像在被子繼承后父鏡像的onbuild被觸發 > 父鏡像的dockerfile里加入以下命令,子鏡像構建過程中,會觸發onbuild命令 ``` ONBUILD RUN echo "father onbuild" ``` ### 13. dockerfile的構建 > 當前目錄下創建文件 `Dockerfile` > 然后再運行構建命令,則本地就會生成對應的鏡像 ``` # 14. docker build -t 新鏡像名稱:TAG . docker build -t mycentos:1.3 . # 或 指定dockerfile文件地址 docker build -f /mydocker/Dockerfile -t mycentos:1.3 . ```
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