mysql连接数设置操作方法(Too many connections)
mysql在使用过程中,发现连接数超了~~~~
[root@linux-node1 ~]# mysql -u glance -h 192.168.1.17 -p
enter password:
error 1040 (08004): too many connections
解决办法,这也是centos7下修改mysql连接数的做法:
1)临时修改
mariadb [(none)]> show variables like "max_connections";
+-----------------+-------+
| variable_name | value |
+-----------------+-------+
| max_connections | 214 |
+-----------------+-------+
1 row in set (0.00 sec)
mariadb [(none)]> set global max_connections=1000;
query ok, 0 rows affected (0.00 sec)
mariadb [(none)]> show variables like "max_connections";
+-----------------+-------+
| variable_name | value |
+-----------------+-------+
| max_connections | 1000 |
+-----------------+-------+
1 row in set (0.00 sec)
2)永久修改:
配置/etc/my.cnf
[mysqld]新添加一行如下参数:
max_connections=1000
重启mariadb服务,再次查看mariadb数据库最大连接数,可以看到最大连接数是214,并非我们设置的1000。
mariadb [(none)]> show variables like 'max_connections';
+-----------------+-------+
| variable_name | value |
+-----------------+-------+
| max_connections | 214 |
+-----------------+-------+
这是由于mariadb有默认打开文件数限制。可以通过配置/usr/lib/systemd/system/mariadb.service来调大打开文件数目。
配置/usr/lib/systemd/system/mariadb.service
[service]新添加两行如下参数:
limitnofile=10000
limitnproc=10000
重新加载系统服务,并重启mariadb服务
systemctl --system daemon-reload
systemctl restart mariadb.service
再次查看mariadb数据库最大连接数,可以看到最大连接数已经是1000
mariadb [(none)]> show variables like 'max_connections';
+-----------------+-------+
| variable_name | value |
+-----------------+-------+
| max_connections | 1000 |
+-----------------+-------+
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