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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                #Docker實戰之入門以及Dockerfile(三) [Docker實戰之入門以及Dockerfile(一)](http://git.oschina.net/dockerf/docker-practice/blob/master/Docker%E5%AE%9E%E6%88%98%E4%B9%8B%E5%85%A5%E9%97%A8%E4%BB%A5%E5%8F%8ADockerfile%28%E4%B8%80%29.md?dir=0&filepath=Docker%E5%AE%9E%E6%88%98%E4%B9%8B%E5%85%A5%E9%97%A8%E4%BB%A5%E5%8F%8ADockerfile%28%E4%B8%80%29.md&oid=fd533b0b7665712fdafd3142a61e326ef416dbe1&sha=f11d77675b6ad637a21f26ece6bb11b9e4a66386) [Docker實戰之入門以及Dockerfile(二)](http://git.oschina.net/dockerf/docker-practice/blob/master/Docker%E5%AE%9E%E6%88%98%E4%B9%8B%E5%85%A5%E9%97%A8%E4%BB%A5%E5%8F%8ADockerfile%28%E4%BA%8C%29.md?dir=0&filepath=Docker%E5%AE%9E%E6%88%98%E4%B9%8B%E5%85%A5%E9%97%A8%E4%BB%A5%E5%8F%8ADockerfile%28%E4%BA%8C%29.md&oid=76ce88d4a3af4e797873fac07f8f84c4ac72602a&sha=f11d77675b6ad637a21f26ece6bb11b9e4a66386) 文章內容,由【[Docker實訓課程](https://csphere.cn/training)】 [第一講視頻](http://pan.baidu.com/s/1hq2COGc)翻譯整理而成 [培訓代碼](https://github.com/nicescale/docker-training) https://github.com/nicescale/docker-training [虛擬機鏡像](http://market.aliyun.com/products/56014007/jxsc000181.html) http://market.aliyun.com/products/56014007/ ##應用鏡像 ##csphere/wordpress:4.2 ``` # cd docker-training/wordpress/ # ls -a . license.txt wp-config-sample.php wp-login.php .. readme.html wp-content wp-mail.php Dockerfile wp-activate.php wp-cron.php wp-settings.php .dockerignore wp-admin wp-includes wp-signup.php index.php wp-blog-header.php wp-links-opml.php wp-trackback.php init.sh wp-comments-post.php wp-load.php xmlrpc.php /docker-training/wordpress# cat Dockerfile from csphere/php-fpm:5.4 add init.sh /init.sh entrypoint ["/init.sh", "/usr/bin/supervisord", "-n", "-c", "/etc/supervisord.conf"] ``` 使用docker后,在項目代碼目錄下,寫Dockerfile文件,非常方便把項目代碼直接打包到docker鏡像中,如有哪些文件不想被打包進去,可以在`.dockerignore`文件中定義 Dockerfile解析: - wordpress鏡像是基于csphere/php-fpm:5.4來進行構建 - `ONBUILD`指令生效,把代碼文件拷貝到網站根目錄下 - `init.sh`腳本對WordPress連接mysql數據庫進行配置,固運行wordpress鏡像后,只需要進行配置WordPress即可,數據庫已準備就緒! 生成WordPress鏡像 `docker build -t csphere/wordpress:4.2 .` 查看當前主機本地都有哪些docker鏡像 `docker images` 創建WordPress準備 查看主機ip地址 `ifconfig eth0` 192.168.1.20 創建WordPress容器: ``` docker run -d -p 80:80 --name wordpress -e WORDPRESS_DB_HOST=192.168.1.20 -e WORDPRESS_DB_USER=admin -e WORDPRESS_DB_PASSWORD=csphere2015 csphere/wordpress:4.2 49d0cddb4e6998a43285fe09165030ba80485065867b9cb8fae9fbdb97cd077f ``` 參數解析: - -d 后臺運行 - -p 80:80 將宿主機的80端口映射到容器的80端口 - --name wordpress 給容器命名為wordpress - -e WORDPRESS_DB_HOST=192.168.1.20 數據庫主機的ip地址(或者域名) - -e WORDPRESS_DB_USER=admin 數據庫的用戶,默認是admin - -e WORDPRESS_DB_PASSWORD=csphere2015 登陸數據的密碼,默認是csphere2015 - csphere/wordpress:4.2使用此鏡像創建WordPress容器 訪問`http://your_ip`,選擇語言,并進行設置`wordpress` ![](https://discuss.csphere.cn/uploads/default/optimized/2X/5/5e887120f584095151915ef2ddbc6c6f6d8e4885_1_422x500.png) ## ENTRYPOINT和CMD的區別 ENTRYPOINT解析 定義: An ENTRYPOINT allows you to configure a container that will run as an executable 運行一個Docker容器像運行一個程序一樣 ENTRYPOINT的使用方法: 1.ENTRYPOINT?["executable",?"param1",?"param2"]?(the?preferred?exec?form) > 推薦使用1方法,啟動起來后,pid為1 2.ENTRYPOINT?command?param1?param2?(shell?form)? >啟動起來后,pid號為shell命令執行完的pid號 CMD解析 CMD的使用方法: 1.CMD?["executable","param1","param2"]?(exec?form,?this?is?the?preferred?form) >運行一個可執行的文件并提供參數 2.CMD?["param1","param2"]?(as?default?parameters?to?ENTRYPOINT)? >為ENTRYPOINT指定參數 3.CMD?command?param1?param2?(shell?form)? >是以”/bin/sh -c”的方法執行的命令 實戰測試`CMD` ``` vim Dockerfile FROM centos:centos7.1.1503 CMD ["/bin/echo", "This is test cmd"] ``` 生成cmd鏡像 `docker build -t csphere/cmd:0.1 .` 生成cmd容器,進行測試 `docker run -it --rm csphere/cmd:0.1` `This is test cmd` 測試是否可以替換`cmd`的命令 ``` docker run -it csphere/cmd:0.1 /bin/bash [root@c1963a366319 /]# ``` 測試結果,在Dockerfile中定義的`CMD`命令,在執行`docker run`的時候,`CMD`命令可以被替換。 實戰測試`ENTRYPOINT` ``` FROM centos:centos7.1.1503 ENTRYPOINT ["/bin/echo", "This is test entrypoint"] ``` 生成ent(entrypoint)鏡像 `docker build -t csphere/ent:0.1 .` 生成ent容器,進行測試 ``` docker run -it csphere/ent:0.1 This is test entrypoint ``` 測試是否可以替換`entrypoint`的命令 ``` docker run -it csphere/ent:0.1 /bin/bash This is test entrypoint /bin/bash ``` 測試結果,在Dockerfile定義的`ENTRYPOINT`命令,通過以上方式不能被替換 實戰再次測試`ENTRYPOINT` `docker run -it --entrypoint=/bin/bash csphere/ent:0.1` 測試結果,ENTRYPOINT命令也可以被替換,需要在執行`docker run`時添加`--entrypoint=`參數,此方法多用來進行調試 ##更多精彩內容,訪問:[cSphere-希云社區](https://discuss.csphere.cn) 說明,文章由[cSphere-希云](https://csphere.cn)所有,轉載請整體轉載,并保留原文鏈接,且不得修改原文! 轉載,請聯系"cSphere"微信公眾號 ![](https://discuss.csphere.cn/uploads/default/original/2X/1/1f82a3e93d907fc9fb5acf552f2646b74f5706d5.jpg)
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