我很难在/etc/my.cnf中设置max_connections参数，但MariaDB似乎没有从文件中读取参数 .
我的/etc/my.cnf文件：
[mysqld]
#skip-grant-tables
datadir=/data/mysql
socket=/data/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# network
connect_timeout = 60
wait_timeout = 28800
max_connections = 100000
max_allowed_packet = 64M
max_connect_errors = 1000
# limits
tmp_table_size = 512M
max_heap_table_size = 256M
table_cache = 512
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
[client]
port = 3306
socket= /data/mysql/mysql.sock
但是当我在MariaDB中检查变量时，它会显示默认值：
MariaDB [(none)]> show variables like 'max_connections';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 214 |
+-----------------+-------+
1 row in set (0.00 sec)
但是，my.cnf中的其他参数是正确的：
MariaDB [(none)]> show variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout | 28800 |
+---------------+-------+
1 row in set (0.00 sec)
MariaDB [(none)]> show variables like 'max_allowed_packet';
+--------------------+----------+
| Variable_name | Value |
+--------------------+----------+
| max_allowed_packet | 67108864 |
+--------------------+----------+
1 row in set (0.00 sec)
MariaDB [(none)]> show variables like 'max_connect_errors';
+--------------------+-------+
| Variable_name | Value |
+--------------------+-------+
| max_connect_errors | 1000 |
+--------------------+-------+
1 row in set (0.00 sec)
MariaDB [(none)]> show variables like 'connect_timeout';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| connect_timeout | 60 |
+-----------------+-------+
1 row in set (0.00 sec)
我可以从mysql命令行设置此变量，但是当我重新启动服务时它会重置：
MariaDB [(none)]> set global max_connections := 10000;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show variables like 'max_connections';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 10000 |
+-----------------+-------+
1 row in set (0.00 sec)
操作系统：RHEL 7
MariaDB版本：mariadb-server-5.5.47-1.el7_2.x86_64
2 回答
我认为解决方案就在这里 . 增加打开文件限制 .
https://dba.stackexchange.com/questions/12061/mysql-auto-adjusting-max-connections-values
我在ubuntu服务器上有同样的问题 . 我已经更改了这个文件/etc/mysql/my.cnf
然后执行查询 . 你正在改变错误的文件 .