MySQL的Linux环境设置
关闭selinux
查看selinux状态：
[root@betacat selinux]# sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: enforcing
Mode from config file: disabled
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 28在配置文件中设置关闭selinux：
vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=enforcing
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted将SELINUX=enforcing改成SELINUX=disabled
系统IO调度模式改为deadline
查看当前模式：
[root@betacat ~]# dmesg | grep -i scheduler
[ 0.334857] io scheduler noop registered
[ 0.334860] io scheduler deadline registered
[ 0.334899] io scheduler cfq registered (default)如果默认已经是deadline就不需要改。
修改：
[root@betacat ~]# grubby --update-kernel=ALL --args="elevator=deadline"重启系统
上面两点都是需要重启系统后才生效的：
[root@betacat ~]# reboot设备swap分区大小
查看：
[root@betacat ~]# cat /proc/sys/vm/swappiness
20
[root@betacat ~]# sysctl -a | grep swap
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.ens33.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
vm.swappiness = 20修改：
[root@betacat ~]# vi /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
vm.swappiness=30修改操作系统限制
查看：
[root@betacat ~]# 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) 7215
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024 ###<----单个进程最多可以打开1024个文件
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) 7215 ###<---最多可以打开的进程数
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited修改系统的软硬限制：
[root@betacat ~]# vi /etc/security/limits.conf加入以下内容,然后重启系统：
#
# -
#
#* soft core 0
#* hard rss 10000
#@student hard nproc 20
#@faculty soft nproc 20
#@faculty hard nproc 50
#ftp hard nproc 0
#@student - maxlogins 4
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
# End of file