啟用 php-apache

1. docker search 搜尋 centos-apache 相關的映像檔，本章主要說明容器間的連線，已啟動 mariadb 資料庫的容器，選用 CentOS 7 為基底的 kokspflanze/centos-apache-php7 映像檔。

   [root@dyw219 ~]# docker search centos-apache
   NAME                             DESCRIPTION                            STARS OFFICIAL AUTOMATED
   naqoda/centos-apache-php         The perfect LAMP stack, including...   11             [OK]
   kokspflanze/centos-apache-php7   Docker with CentOS 7, systemd, Ap...   5              [OK]
   guanxiaohua2k6/centos-apache-php Centos7, apache 2.4, php 5.6, drule    2              [OK]
   freezerglp/centos-apache-php                                            1              
   kokspflanze/centos-apache-php71  centos apache php71                    1              [OK]
   cetres/centos-apache-php-oci     CentOS with php, modules (OCI, MS...   1              [OK]
   kokspflanze/centos-apache-php72  centos apache php72                    1              [OK]
   cetres/centos-apache-php         CentOS with php, modules (OCI8, S...   1              [OK]
   skywidesoft/centos-apache-php7                                          1              
   dwsla/centos-apache22-php54                                             1              [OK]
   identicum/centos-apache-php      centos-apache-php                      0              
   project42/centos-apache          LAP (notice no M) stack built on ...   0              [OK]
   suhoag/centos-apache             Compiling and installing apache f...   0              [OK]
   furu8ma/centos-apache-php-goofys CentOS 6.x + Apache 2.2.x + PHP5.fys   0              [OK]
   kokspflanze/centos-apache-php56  centos apache php56                    0              [OK]
   junix123/centos-apache-php       centos-apache-php                      0              
   gkshk/centos-apache-php-redis                                           0              
   vikas027/centos-apache-php       CentOS with Apache and PHP             0              [OK]
   snkhryk/centos-apache-php                                               0              
   isaocorp/centos-apache-php-goofy centos6.9 + apache 2.2 + php 5.3 ...   0              [OK]
   jonnyczi/centos-apache-php       Apache Php web server on centos        0              
   jonnyczi/centos-apache-proxy     Centos Apache Proxy                    0              
   velasquezerik/centos-apache-php7 centos-apache-php7-mlrclient           0              
   feduxorg/centos-apache           Apache HTTPD auf CentOS                0              [OK]
   identicum/centos-apache          centos-apache                          0
   

2. 使用 kokspflanze/centos-apache-php7 映像檔，Docker run 啟用名為 webphp1 的容器，--link name:alias 設定要連接的容器 mdb，別名設成同名 mdb。

   [root@dyw219 ~]# docker run -dP --name webphp1 --link mdb:mdb guanxiaohua2k6/centos-apache-php
   e1e597e63f3c8a036f50900981e6b00593b2a7268675ab415bda232a25e10519
   

3. docker ps 查看容器，docker host 連接容器 webphp1 80 port 的連接埠是 32777。

   [root@dyw219 ~]# docker ps
   CONTAINER ID        IMAGE                              COMMAND                  CREATED       
   e1e597e63f3c        guanxiaohua2k6/centos-apache-php   "/usr/sbin/httpd -D F"   11 minutes ago
   282553feccf2        centos/mariadb-102-centos7         "container-entrypoint"   11 hours ago  
   
   STATUS              PORTS                                           NAMES
   Up 11 minutes       0.0.0.0:32777->80/tcp, 0.0.0.0:32776->443/tcp   webphp1
   Up 11 hours         3306/tcp                                        mdb
   

4. docker run 執行 env 查看容器 webphp2 (設定與 webphp1 完全一樣) 的環境變數，過濾 MDB_ 的變數，--rm 在執行結束馬上刪除容器。變數 MDB_PORT_3306_TCP 是 tcp://172.17.0.2:3306，吻合上節 mdb 容器查到的 IP。

   [root@dyw219 ~]# docker run --rm --name webphp2 --link mdb:mdb guanxiaohua2k6/centos-apache-php env
   PATH=/root/.composer/vendor/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   HOSTNAME=64d23d59ff34
   MDB_PORT=tcp://172.17.0.2:3306
   MDB_PORT_3306_TCP=tcp://172.17.0.2:3306
   MDB_PORT_3306_TCP_ADDR=172.17.0.2
   MDB_PORT_3306_TCP_PORT=3306
   MDB_PORT_3306_TCP_PROTO=tcp
   MDB_NAME=/webphp2/mdb
   MDB_ENV_MYSQL_ROOT_PASSWORD=123qwe
   MDB_ENV_SUMMARY=MariaDB 10.2 SQL database server
   MDB_ENV_DESCRIPTION=MariaDB is a multi-user, multi-threaded SQL database server....
   MDB_ENV_STI_SCRIPTS_URL=image:///usr/libexec/s2i
   MDB_ENV_STI_SCRIPTS_PATH=/usr/libexec/s2i
   MDB_ENV_APP_ROOT=/opt/app-root
   MDB_ENV_PLATFORM=el7
   MDB_ENV_BASH_ENV=/usr/share/container-scripts/mysql/scl_enable
   MDB_ENV_ENV=/usr/share/container-scripts/mysql/scl_enable
   MDB_ENV_PROMPT_COMMAND=. /usr/share/container-scripts/mysql/scl_enable
   MDB_ENV_MYSQL_VERSION=10.2
   MDB_ENV_APP_DATA=/opt/app-root/src
   MDB_ENV_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/mysql
   MDB_ENV_MYSQL_PREFIX=/opt/rh/rh-mariadb102/root/usr
   MDB_ENV_ENABLED_COLLECTIONS=rh-mariadb102
   HOME=/root