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我使用 Postgresql 在 Docker (k8s) 中启动了 Kiwi TCMS。它开始正常，但是当我想运行迁移时它崩溃了。我使用这个 docker-compose来获得灵感。日志显示与 MySQL 的连接问题。但我改变了引擎的配置。看：

bash-4.2$ KIWI_DB_ENGINE=django.db.backends.postgresql_psycopg2 /Kiwi/manage.py migrate
django.db.backends.postgresql_psycopg2
Traceback (most recent call last):
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 194, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/venv/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/venv/lib/python3.6/site-packages/MySQLdb/__init__.py", line 85, in Connect
    return Connection(*args, **kwargs)
  File "/venv/lib/python3.6/site-packages/MySQLdb/connections.py", line 204, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
_mysql_exceptions.OperationalError: (2013, "Lost connection to MySQL server at 'reading initial communication packet', system error: 0")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Kiwi/manage.py", line 13, in <module>
    execute_from_command_line(sys.argv)
  File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 350, in execute
    self.check()
  File "/venv/lib/python3.6/site-packages/django/core/management/base.py", line 379, in check
    include_deployment_checks=include_deployment_checks,
  File "/venv/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 59, in _run_checks
    issues = run_checks(tags=[Tags.database])
  File "/venv/lib/python3.6/site-packages/django/core/checks/registry.py", line 71, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/venv/lib/python3.6/site-packages/django/core/checks/database.py", line 10, in check_database_backends
    issues.extend(conn.validation.check(**kwargs))
  File "/venv/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 9, in check
    issues.extend(self._check_sql_mode(**kwargs))
  File "/venv/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 13, in _check_sql_mode
    with self.connection.cursor() as cursor:
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 255, in cursor
    return self._cursor()
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 232, in _cursor
    self.ensure_connection()
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/venv/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/venv/lib/python3.6/site-packages/django/db/backends/base/base.py", line 194, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/venv/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/venv/lib/python3.6/site-packages/MySQLdb/__init__.py", line 85, in Connect
    return Connection(*args, **kwargs)
  File "/venv/lib/python3.6/site-packages/MySQLdb/connections.py", line 204, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (2013, "Lost connection to MySQL server at 'reading initial communication packet', system error: 0")

请问哪里有问题？

4

2 回答 2

0 
bash-4.2$ KIWI_DB_ENGINE=django.db.backends.postgresql_psycopg2 /Kiwi/manage.py migrate
django.db.backends.postgresql_psycopg2

这是在 docker 容器内设置一个环境变量，我不确定这是否有效或哪个优先。

如果您希望有人帮助您发布整个 docker-compose.yml（或您使用的任何 kubernetes 控制文件）。显然，应用程序认为它已配置为与 MySQL 通信，并且在 MySQL 不可用时失败。

于 2019-11-09T21:28:44.047 回答
0

所以问题出在使用的 docker 镜像的版本上。我使用了 docker image 标签kiwitcms/kiwi:6.2，我认为它是最新版本。但事实并非如此。此版本（docker image）没有更改数据库引擎的代码。我将 docker tag 的版本更改为latest，现在效果很好。

于 2019-11-11T09:32:29.177 回答