使用Kubectl运行mysql命令

Question

我有mariadb-gallera部署在我的Kubernetes集群上，一旦pod部署并启动并运行，我想进入pod并以root身份登录mysql，然后创建一个数据库，如果它不存在的话。

我试着这样做，但它失败了，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 }}"

请帮我想个办法。

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

你的命令中有一个打字错误-

- 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 }}"

注意'CREATE之前应该有-e。

另外，请使用k8s_exec模块代替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'