1 查看软件版本
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

yum install -y wget
wget https://cdn.mysql.com/archives/mysql-5.7/mysql-5.7.33-el7-x86_64.tar
2 卸载之前版本的Mariadb和 MySQL

rpm -qa|grep -i mariadb
rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64
rpm -qa |grep mysql

rpm -qa| grep mysql | xargs rpm -e --nodeps
rpm -qa| grep mariadb | xargs rpm -e --nodeps
rpm -qa| grep mysql
rpm -qa| grep mariadb



sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
cat /etc/selinux/config
setenforce 0
getenforce
systemctl stop firewalld.service && systemctl disable firewalld && systemctl status firewalld


3 安装mysql依赖包

yum install -y libaio net-tools tree

4 解压mysql 文件到/usr/local/mysql
[root@localhost ~]# tar xf mysql-5.7.33-el7-x86_64.tar
[root@localhost ~]# tar xf mysql-5.7.33-el7-x86_64.tar.gz -C /usr/local/
cd /usr/local/
[root@localhost local]# ln -sf mysql-5.7.33-el7-x86_64 mysql

5 添加系统mysql组和mysql用户并修改权限

[root@localhost local]# groupadd mysql
[root@localhost local]# useradd -g mysql mysql
chown -R mysql:mysql /usr/local/mysql-5.7.33-el7-x86_64/
chown -R mysql:mysql /usr/local/mysql


6 配置my.cnf文件

mkdir -p /mysql/{data,log}
chown -R mysql:mysql /mysql

[root@localhost local]# /usr/local/mysql/bin/mysql --help --verbose | grep my.cnf
                      order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf

vi /etc/my.cnf
[mysqld]
# basic settings #
user = mysql
port = 3306
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
autocommit = 1
server-id = 1
character_set_server = utf8mb4
transaction_isolation = READ-COMMITTED
lower_case_table_names = 1
explicit_defaults_for_timestamp = 1
max_allowed_packet = 16777216
event_scheduler = 1
basedir = /usr/local/mysql
datadir = /mysql/data
socket = /tmp/mysql.sock
pid-file = /mysql/data/mysqld.pid

# connection #
interactive_timeout = 1800
wait_timeout = 1800
lock_wait_timeout = 1800
skip_name_resolve = 1
max_connections = 1000
max_connect_errors = 1000000

# table cache performance settings #
table_open_cache = 4096
table_definition_cache = 4096
table_open_cache_instances = 64

# log settings #
log_error = /mysql/log/error.log
slow_query_log_file = /mysql/log/slow.log
log-bin = /mysql/log/mysql-bin
relay_log = mysql-relay-bin
general_log_file = general.log

slow_query_log = 1
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
long_query_time = 1
min_examined_row_limit = 100
binlog-rows-query-log-events = 1
log-bin-trust-function-creators = 1
expire-logs-days = 7
log-slave-updates = 1

# replication settings #
master_info_repository = TABLE
relay_log_info_repository = TABLE
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = ROW
binlog_rows_query_log_events = 1
relay_log = relay.log
relay_log_recovery = 1
slave_skip_errors = ddl_exist_errors
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'

replicate-ignore-db = mysql
replicate-ignore-db = information_schema
replicate-ignore-db = performance_schema
replicate-ignore-db = sys


[mysqld-5.7]
# new innodb settings #
loose_innodb_numa_interleave = 1
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 16
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_rseg_truncate_frequency = 128

# new replication settings #
slave-parallel-type = LOGICAL_CLOCK
slave-parallel-workers = 16
slave_preserve_commit_order = 1
slave_transaction_retries = 128

# other change settings #
binlog_gtid_simple_recovery = 1
log_timestamps = system
show_compatibility_56 = on



7 配置环境变量
vi /etc/profile

export MYSQL_HOME=/usr/local/mysql
export PATH=$MYSQL_HOME/bin:$PATH
source /etc/profile

8 初始化数据库

mysqld --defaults-file=/etc/my.cnf  --initialize
cat /mysql/log/error.log

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9 配置开机自启动
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

vi /etc/init.d/mysqld
basedir=/usr/local/mysql
datadir=/mysql/data

chmod a+x /etc/init.d/mysqld
chkconfig --add mysqld
chkconfig --list

10 启动mysql服务并初始化密码

service mysqld start

mysql -uroot -p
alter user user() identified by '123';

create database cndba;