詳細(xì)說(shuō)明mysql連接數(shù)設(shè)置設(shè)置方法(Too many connections)

mysql在使用過(guò)程中，發(fā)現(xiàn)連接數(shù)超了~~~~

[root@linux-node1 ~]# mysql -u glance -h 192.168.1.17 -p
Enter password:
ERROR 1040 (08004): Too many connections

解決辦法，這也是centos7下修改mysql連接數(shù)的做法：

1）臨時(shí)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]新添加一行如下參數(shù)：

max_connections=1000

重啟mariadb服務(wù)，再次查看mariadb數(shù)據(jù)庫(kù)最大連接數(shù)，可以看到最大連接數(shù)是214，并非我們?cè)O(shè)置的1000。

MariaDB [(none)]> show variables like 'max_connections'; 
+-----------------+-------+ 
  Variable_name   Value   
+-----------------+-------+ 
  max_connections   214   
+-----------------+-------+

這是由于mariadb有默認(rèn)打開(kāi)文件數(shù)限制�？梢酝ㄟ^(guò)配置/usr/lib/systemd/system/mariadb.service來(lái)調(diào)大打開(kāi)文件數(shù)目。

配置/usr/lib/systemd/system/mariadb.service

[Service]新添加兩行如下參數(shù)：

LimitNO
FILE
=10000
LimitNPROC=10000

重新加載系統(tǒng)服務(wù)，并重啟mariadb服務(wù)

systemctl --system daemon-reload 
systemctl restart mariadb.service

再次查看mariadb數(shù)據(jù)庫(kù)最大連接數(shù)，可以看到最大連接數(shù)已經(jīng)是1000

MariaDB [(none)]> show variables like 'max_connections'; 
+-----------------+-------+ 
  Variable_name   Value   
+-----------------+-------+ 
  max_connections   1000   
+-----------------+-------+

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