rpm -qa|grep -i mysql

cd /usr/local/src/
wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm 
rpm -ivh mysql57-community-release-el7-8.noarch.rpm 
yum -y install mysql-server 

systemctl restart mysqld

 grep "password" /var/log/mysqld.log    
 结果：[Note] A temporary password is generated for root@localhost: #xVt4w;ISGt0

mysql -u root -p 
接着输入随机产生的密码#xVt4w;ISGt0

可先执行set global validate_password_policy=0;这个参数表示密码可以简单点，只要密码长度至少8位即可
alter user 'root'@'localhost' identified by 'test2017!!';

CREATE USER 'root'@'%' IDENTIFIED BY 'test2017!!';

grant all on *.* to 'root'@'%' identified by 'test2017!!' with grant option;

配置文件：/etc/my.cnf 
日志文件：/var/log/var/log/mysqld.log 
服务启动脚本：/usr/lib/systemd/system/mysqld.service 
socket文件：/var/run/mysqld/mysqld.pid

cd /myData
mkdir mysqllog
chown mysql:mysql mysqllog

log_error = /myData/mysqllog/mysql-error.log
datadir=/myData/mysql
socket=/myData/mysql/mysql.sock

cd /myData
cp -a /var/lib/mysql ./

mysql -u root -p 
use mysql;
修改密码：update user set authentication_string=password("新密码") where user='qif';
修改host:update user set host = '%' where user = 'qif';
flush privileges;

[client]
port = 3306
socket = /myData/mysql/mysql.sock
default-character-set = utf8

[mysqld]
port = 3306
socket = /myData/mysql/mysql.sock

basedir = /usr/lib64/mysql
datadir = /myData/mysql
user = mysql
bind-address = 0.0.0.0
server-id = 1

init-connect = 'SET NAMES utf8'
character-set-server = utf8

skip-name-resolve
#skip-networking
back_log = 300

sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

max_connections = 1000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 256
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 32M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 8M
key_buffer_size = 16M

thread_cache_size = 16

query_cache_type = 1
query_cache_size = 16M
query_cache_limit = 2M

ft_min_word_len = 4

log_bin = /myData/mysqllog/mysql-bin
binlog_format = mixed
expire_logs_days = 30

log_error = /myData/mysqllog/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /myData/mysqllog/mysql-slow.log

performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

skip-external-locking

default_storage_engine = InnoDB

innodb_file_per_table = 1
innodb_open_files = 500
innodb_buffer_pool_size = 4096M
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_thread_concurrency = 0
innodb_purge_threads = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 32M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120

event_scheduler=ON 

bulk_insert_buffer_size = 8M
myisam_sort_buffer_size = 16M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

interactive_timeout = 28800
wait_timeout = 28800

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 16M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M