内核参数调整 limit

配置文件路径：/etc/security/limits.conf

常用参数调整：

* soft nofile 65536
* hard nofile 102400
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited

　　

# - "soft" for enforcing the soft limits
# - "hard" for enforcing hard limits

- nofile - max number of open file descriptors

- nproc - max number of processes

soft 值必须小于 hard；超出soft警告，超出hard异常；

 

注意：如果在/etc/security/limits.d/下进行了配置，将会覆盖 /etc/security/limits.conf 的配置参数；

配置生效：

　　重启系统 或者 重启shell进程

 

[root@ckm01 ~]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7736
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65536
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) 65535
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[root@ckm01 ~]# ulimit -Ha
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7736
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 102400
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) unlimited
cpu time               (seconds, -t) unlimited
max user processes              (-u) 655350
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

　　

 

 

要使 limits.conf 文件配置生效，必须要确保 pam_limits.so 文件被加入到启动文件中。查看 /etc/pam.d/login 文件中有：

session required /lib/security/pam_limits.so

　　注意：Centos 7并未发现该参数，配置 limits.conf 依然生效；