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:
LimitNO FILE =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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