max_connections 选项不适用于 mysqld

Question

我在 /etc/my.conf 中设置了 max_connections=2000 并重新启动了 mysqld

但仍然 max_connections 似乎卡在了 412

mysql>  SHOW VARIABLES LIKE "max_connections";
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 412  |
+-----------------+-------+
1 row in set (0.01 sec)

mysql>

我也试过重启 mysqld post

mysql> SET GLOBAL max_connections = 2000;

但我仍然从查询 SHOW VARIABLES LIKE "max_connections";

中得到 max_connections | 412

Answer 1

我通过更改系统级别对打开文件数的限制解决了这个问题。

检查系统级别。运行命令 ulimit -a 输出将是

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 31168
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1012
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 4096
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

open files 限制必须大于 max_connecitons

的值

要更改它，请执行以下操作

 sudo nano /etc/security/limits.conf

和add/edit

 *   hard    nofile  4096
 *   soft    nofile  4096

现在re-login到服务器并重新启动mysqld并检查

mysql>  SHOW VARIABLES LIKE "max_connections";
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 2000  |
+-----------------+-------+
1 row in set (0.01 sec)

mysql>

Answer 2

为服务文件创建覆盖

systemctl edit mysql.service
添加以下内容

    [Service]
    LimitNOFILE=4096

重新启动 MySQL 服务器

service mysql restart

max_connections 选项不适用于 mysqld

max_connections option not working with mysqld

mysql

connection-pooling

file