备份和导入数据
./mysqldump -u root -p123321 test > test.sql
rsync -av test.sql root@192.168.0.212:/usr/local/mysql/
./mysql -uroot -p test < …/test.sql
sudo tar -zxvf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz -C /usr/local/
sudo ln -sfn /usr/local/mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql
设置目录权限
sudo chown -R mysql:mysql /usr/local/mysql
sudo chmod -R 755 /usr/local/mysql
进入MySQL的bin目录
cd /usr/local/mysql/bin
执行初始化（生成临时root密码 记住该密码！！！）
sudo ./mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data
记录生成的临时密码（在输出日志中查找）
输出示例：A temporary password is generated for root@localhost: XXXXXXXX
-------------修改配置vi /etc/my.cnf
#[mysqld]
#datadir=/var/lib/mysql
#socket=/var/lib/mysql/mysql.sock
Disabling symbolic-links is recommended to prevent assorted security risks
#symbolic-links=0
Settings user and group are ignored when systemd is used.
If you need to run mysqld under a different user or group,
customize your systemd unit file for mariadb according to the
instructions in http://fedoraproject.org/wiki/Systemd
添加以下内容（按需修改路径）
[mysqld]
basedir=/usr/local/mysql
datadir=/usr/local/mysql-5.7.33-linux-glibc2.12-x86_64/data
socket=/tmp/mysql.sock
character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci
bind-address = 0.0.0.0
双M结构（互为主备）配置开始
server-id = 1
log-bin = mysql-bin
binlog_format = ROW
gtid_mode = ON
enforce_gtid_consistency = ON
auto_increment_increment = 2
auto_increment_offset = 1
主库配置（确保只记录目标库的变更）
binlog-do-db = test
从库配置（确保只同步目标库的变更）
replicate-do-db = test
双M结构（互为主备）配置结束
[client]
socket=/tmp/mysql.sock
default-character-set=utf8mb4
#[mysqld_safe]
#log-error=/var/log/mariadb/mariadb.log
#pid-file=/var/run/mariadb/mariadb.pid
#log-error=/usr/local/mysql/log/mariadb/mariadb.log
#pid-file=/usr/local/mysql/run/mariadb/mariadb.pid
include all files from the config directory
!includedir /etc/my.cnf.d
-------------结束修改配置vi /etc/my.cnf
添加系统服务（可选）
sudo cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld
sudo chmod +x /etc/init.d/mysqld
启动服务
sudo service mysqld start
检查状态
sudo service mysqld status
登录MySQL
/usr/local/mysql/bin/mysql -u root -p
执行简单查询
SHOW DATABASES;
SELECT VERSION();
修改root密码：
UPDATE mysql.user SET Host=‘%’ WHERE User=‘root’;
FLUSH PRIVILEGES;
ALTER USER ‘root’@‘%’ IDENTIFIED BY ‘123321’;
FLUSH PRIVILEGES;
-------双主配置开始
– 在两个服务器都执行：
CREATE USER ‘repl’@‘%’ IDENTIFIED BY ‘StrongPassword’;
GRANT REPLICATION SLAVE ON . TO ‘repl’@‘%’;
FLUSH PRIVILEGES;
stop slave;
CHANGE MASTER TO
MASTER_HOST=‘192.168.0.211’,
MASTER_USER=‘repl’,
MASTER_PORT=3306,
MASTER_PASSWORD=‘StrongPassword’,
MASTER_AUTO_POSITION=1;
START SLAVE;
SHOW SLAVE STATUS;
stop slave;
RESET MASTER;
-------双主配置结束
--------升级
sudo tar -zxvf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz -C /usr/local/
sudo ln -sfn /usr/local/mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql
备份旧文件（可选）
sudo cp /usr/local/mysql/bin/mysqld /backup/
替换二进制文件
sudo cp /usr/local/mysql-5.7.44-linux-glibc2.12-x86_64/bin/* /usr/local/mysql/bin/
升级表
sudo service mysqld start
/usr/local/mysql/bin/mysql_upgrade -u root -p
超级大坑！！！！！！！！！！！！！！！！！！
注意，如果是从5.7.33升级到了5.7.44后，要么在客户端连接时加上useSSL=false，要么在配置文件里配置skip_ssl = 1，不然原有的一些代码配置无法连接！UAP和navicat这些东西连接时默认就会帮忙带上useSSL=false，所以自身无法感知该变化，但是如果别人项目里连接你没加，那就失败了！
[mysqld]
skip_ssl = 1 # 或 skip_ssl # 两种写法等效
--------升级结束