13.5. 使用 Podman 手动运行容器和 pod

流程

1. 显示 mariadb-conf/Containerfile 文件：

   $ cat mariadb-conf/Containerfile
   FROM docker.io/library/mariadb
   COPY my.cnf /etc/mysql/my.cnf

2. 显示 mariadb-conf/my.cnf 文件：

   [client-server]
   # Port or socket location where to connect
   port = 3306
   socket = /run/mysqld/mysqld.sock
   
   # Import all .cnf files from the configuration directory
   [mariadbd]
   skip-host-cache
   skip-name-resolve
   bind-address = 127.0.0.1
   
   !includedir /etc/mysql/mariadb.conf.d/
   !includedir /etc/mysql/conf.d/

3. 使用 mariadb-conf/Containerfile 来构建 docker.io/library/mariadb 镜像：

   $ cd mariadb-conf
   $ podman build -t mariadb-conf .
   $ cd ..
   STEP 1: FROM docker.io/library/mariadb
   Trying to pull docker.io/library/mariadb:latest...
   Getting image source signatures
   Copying blob 7b1a6ab2e44d done
   ...
   Storing signatures
   STEP 2: COPY my.cnf /etc/mysql/my.cnf
   STEP 3: COMMIT mariadb-conf
   --> ffae584aa6e
   Successfully tagged localhost/mariadb-conf:latest
   ffae584aa6e733ee1cdf89c053337502e1089d1620ff05680b6818a96eec3c17

4. 可选：列出所有镜像：

   $ podman images
   LIST IMAGES
   REPOSITORY                                                       TAG         IMAGE ID      CREATED             SIZE
   localhost/mariadb-conf                                           latest      b66fa0fa0ef2  57 seconds ago      416 MB

5. 创建名为 wordpresspod 的 pod，并配置容器和主机系统之间的端口映射：

   $ podman pod create --name wordpresspod -p 8080:80

6. 在 wordpresspod pod 中创建 mydb 容器：

   $ podman run --detach --pod wordpresspod \
       -e MYSQL_ROOT_PASSWORD=1234 \
       -e MYSQL_DATABASE=mywpdb \
       -e MYSQL_USER=mywpuser \
       -e MYSQL_PASSWORD=1234 \
       --name mydb localhost/mariadb-conf

7. 在 wordpresspod pod 中创建 myweb 容器：

   $ podman run --detach --pod wordpresspod \
       -e WORDPRESS_DB_HOST=127.0.0.1 \
       -e WORDPRESS_DB_NAME=mywpdb \
       -e WORDPRESS_DB_USER=mywpuser \
       -e WORDPRESS_DB_PASSWORD=1234 \
       --name myweb docker.io/wordpress

8. 可选：列出与其关联的所有 pod 和容器：

   $ podman ps --pod -a
   CONTAINER ID  IMAGE                               COMMAND               CREATED                 STATUS                     PORTS                 NAMES               POD ID        PODNAME
   9ea56f771915  k8s.gcr.io/pause:3.5                                      Less than a second ago  Up Less than a second ago  0.0.0.0:8080->80/tcp  4b7f054a6f01-infra  4b7f054a6f01  wordpresspod
   60e8dbbabac5  localhost/mariadb-conf:latest       mariadbd              Less than a second ago  Up Less than a second ago  0.0.0.0:8080->80/tcp  mydb                4b7f054a6f01  wordpresspod
   045d3d506e50  docker.io/library/wordpress:latest  apache2-foregroun...  Less than a second ago  Up Less than a second ago  0.0.0.0:8080->80/tcp  myweb               4b7f054a6f01  wordpresspod