问题描述
使用django+celery时, 运行长时间的任务, 一开始操做一次数据库, 20个小时后再次操做数据库.php
过了20多个小时, 再次操做数据库时报错.html
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_exception OperationalError: (2006, 'MySQL server has gone away')
缘由
链接超时
我出现问题就是这个缘由.
进入mysql,执行下面的命令:前端
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连接在无操做28800秒后被自动关闭python
解决方法
当即生效
执行下面的sql命令mysql
mysql> set global wait_timeout=60*60*30;
- 1
该命令是将wait_timeout设置为30小时.
用这种方法,修改完当即生效. 若是重启mysql, 又恢复原来的28800秒.linux
永久生效
该方法修改完以后, 须要重启mysql才能生效.
编辑mysql配置文件my.cnf,添加或修改成下面这条命令.
(个人mysql配置文件路径: /etc/mysql/my.cnf )web
wait_timeout = 108000
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其余缘由
还有一些其余缘由, 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.sql
