# 禁用SELINUX
setenforce 0
vi /etc/selinux/config
#-----------------------------------------------
SELINUX=disabled
#-----------------------------------------------

# 禁用防火墙
systemctl disable firewalld
systemctl stop firewalld
systemctl status firewalld

# 设置内核参数(mysql需要)
vi /etc/sysctl.d/99-sysctl.conf
#-----------------------------------------------
kernel.shmmax = 2199023255552
fs.file-max = 6815744
kernel.sem = 250 32000 100 128
kernel.shmmni = 4096
kernel.panic_on_oops = 1
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
fs.aio-max-nr = 1048576
net.ipv4.ip_local_port_range = 9000 65500
#-----------------------------------------------
# kernel.shmmax算法：修改为物理内容的50%、60%
# 4G:kernel.shmmax = (4G*1024*1024*1024*1024)*50% = 2199023255552

# 使内核参数生效
sysctl -p

# 以下两个命令都可以
service mysqld start
systemctl start mysqld.service

grep 'temporary password' /var/log/mysqld.log
#-----------------------------------------------
2017-08-23T05:56:38.197060Z 1 [Note] A temporary password is generated for root@localhost: gi._hyg/f2oJ
#-----------------------------------------------

mysql -uroot -p

# 以下两个命令都可以修改root密码
alter user 'root'@'localhost' identified by 'Center08+';
set password for root@localhost = password('Center08+');