使用 Kubectl 运行 mysql 命令

Question

我在我的 Kubernetes 集群上部署了mariadb-gallera ，一旦部署了 pod 并且它启动并运行，我想进入 pod 并以 root 身份登录到 mysql，然后创建一个数据库，如果它不存在在那里。

我试图这样做，但失败并出现错误：

 name: "Run command on every Pod labelled app=glaera"
 command: >
   kubectl exec -i "{{ item }}" --namespace backend -- mysql -u'root' -p'YWRtaW4xMjM=' -- 'CREATE DATABASE IF NOT EXISTS aves';
 with_items: "{{ pod_names }}"

请帮我解决。

错误：

failed: [localhost] (item=galera-mariadb-galera-0) => {"ansible_loop_var": "item", "changed": true, "cmd": ["kubectl", "exec", "-i", "galera-mariadb-galera-0", "--namespace", "backend", "--", "mysql", "-uroot", "-pYWRtaW4xMjM=", "--", "CREATE DATABASE IF NOT EXISTS aves;"], "delta": "0:00:00.190892", "end": "2021-02-02 11:57:37.806727", "item": "galera-mariadb-galera-0", "msg": "non-zero return code", "rc": 1, "start": "2021-02-02 11:57:37.615835", "stderr": "ERROR 1049 (42000): Unknown database 'CREATE DATABASE IF NOT EXISTS aves;'\ncommand terminated with exit code 1", "stderr_lines": ["ERROR 1049 (42000): Unknown database 'CREATE DATABASE IF NOT EXISTS aves;'", "command terminated with exit code 1"], "stdout": "", "stdout_lines": []}

Answer 1

您的命令中有错字-

    - name: "Run command on every Pod labelled app=glaera"
      command: >
        kubectl exec -i "{{ item }}" --namespace backend -- mysql -u'root' -p'YWRtaW4xMjM=' -e 'CREATE DATABASE IF NOT EXISTS aves';
      with_items: "{{ pod_names }}"

请注意，在'CREATE之前应该有-e 。

另外，请使用k8s_exec模块而不是command模块。

例如，

    - community.kubernetes.k8s_exec:
        pod: mysql-deployment-5b68bb45bc-n98lp
        namespace: default
        command: mysql --defaults-file=client.conf -h 127.0.0.1 studentdb -e 'CREATE DATABASE IF NOT EXISTS aves'

Answer 2

您的命令中有错字-

    - name: "Run command on every Pod labelled app=glaera"
      command: >
        kubectl exec -i "{{ item }}" --namespace backend -- mysql -u'root' -p'YWRtaW4xMjM=' -e 'CREATE DATABASE IF NOT EXISTS aves';
      with_items: "{{ pod_names }}"

请注意，在'CREATE之前应该有-e 。

另外，请使用k8s_exec模块而不是command模块。

例如，

    - community.kubernetes.k8s_exec:
        pod: mysql-deployment-5b68bb45bc-n98lp
        namespace: default
        command: mysql --defaults-file=client.conf -h 127.0.0.1 -e 'CREATE DATABASE IF NOT EXISTS aves'