OperationalError: (2006, 'MySQL server has gone away')

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问题描述

使用django+celery时, 运行长时间的任务, 一开始操作一次数据库, 20个小时后再次操作数据库.

过了20多个小时, 再次操作数据库时报错.

raised unexpected: OperationalError(2006, 'MySQL server has gone away')Traceback (most recent call last):  File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py", line 85, in manager_method    return getattr(self.get_queryset(), name)(*args, **kwargs)  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 374, in get    num = len(clone)  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 232, in __len__    self._fetch_all()  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 1118, in _fetch_all    self._result_cache = list(self._iterable_class(self))  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 53, in __iter__    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)  File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 894, in execute_sql    raise original_exceptionOperationalError: (2006, 'MySQL server has gone away')

原因

连接超时

我出现问题就是这个原因.
进入mysql,执行下面的命令:

mysql> show global variables like '%timeout';+----------------------------+----------+| Variable_name              | Value    |+----------------------------+----------+| connect_timeout            | 10       || delayed_insert_timeout     | 300      || innodb_lock_wait_timeout   | 50       || innodb_rollback_on_timeout | OFF      || interactive_timeout        | 28800    || lock_wait_timeout          | 31536000 || net_read_timeout           | 30       || net_write_timeout          | 60       || slave_net_timeout          | 3600     || wait_timeout               | 28800    |+----------------------------+----------+

wait_timeout 是28800秒，即mysql链接在无操作28800秒后被自动关闭

解决方法

立即生效

执行下面的sql命令

mysql> set global wait_timeout=60*60*30;

该命令是将wait_timeout设置为30小时.
用这种方法,修改完立即生效. 如果重启mysql, 又恢复原来的28800秒.

永久生效

该方法修改完之后, 需要重启mysql才能生效.
编辑mysql配置文件my.cnf,添加或修改为下面这条命令.
(我的mysql配置文件路径: /etc/mysql/my.cnf )

wait_timeout = 108000

其他原因

还有一些其他原因, 简单描述一下
1: mysql服务关闭
2: 数据包过大
解决方法: 修改 max_allowed_packet 的值, 方法同上.

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