mysql安装版本及下载地址：
https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz

检查系统中的Mysql和mariadb，如果存在将其卸载

#rpm -qa | grep mysql#rpm -qa | grep mariadb#mariadb-libs-5.5.65-1.el7.x86_64#yum -y remove mariadb-libs-5.5.65-1.el7.x86_64

创建mysql用户组和mysql用户

# groupadd mysql#useradd -g mysql -s /sbin/nologin mysql

解压安装包

#tar -zxvf mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz -C /usr/local/# cd /usr/local/# mv mysql-5.7.26-linux-glibc2.12-x86_64 mysql

设置mysql环境变量

# echo "export PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile# source /etc/profile

配置mysql

#mkdir -pv /data/mysql#chown mysql.mysql /data/mysql# chmod go-rwx /data/mysql

初始化数据库并注意日志里面输出的默认密码
#mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql

配置启动脚本

# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld# chkconfig --add mysqld# chkconfig mysqld on# chkconfig --list |grep mysqld

编辑mysql配置文件/etc/my.cnf

[client]port = 3306socket = /tmp/mysql.sock[mysqld]port = 3306socket = /tmp/mysql.sockpid_file = /data/mysql/mysql.piddatadir = /data/mysqldefault_storage_engine = InnoDBmax_allowed_packet = 512Mmax_connections = 2048open_files_limit = 65535skip-name-resolvelower_case_table_names=1character-set-server = utf8mb4collation-server = utf8mb4_unicode_ciinit_connect=‘SET NAMES utf8mb4‘innodb_buffer_pool_size = 512Minnodb_log_file_size = 1024Minnodb_file_per_table = 1innodb_flush_log_at_trx_commit = 0key_buffer_size = 64Mlog-error = /data/mysql/mysql_error.loglog-bin = /data/mysql/mysql-binbinlog_format = mixedexpire_logs_days = 10slow_query_log = 1slow_query_log_file = /data/mysql/slow_query.loglong_query_time = 1server-id=1

启动mysql

vi /etc/init.d/mysqld basedir=/usr/local/mysql //在第46行datadir=/data/mysql# /etc/init.d/mysqld startStarting MySQL.Logging to ‘/data/mysql/localhost.localdomain.err‘. SUCCESS! 

常见错误排除：
若出现无法登陆数据库可以在/etc/my.cnf最后一行加入skip-grant-tables，重启mysql后直接mysql登陆数据库，

mysql> use mysql；mysql> update?MySQL.user set authentication_string=password(‘root‘) where user=‘root‘ ;mysql> flush privileges;

更新数据库密码后删除掉my.cnf最后一行的skip-grant-tables，重启数据库验证新密码是否有效

两台数据库同样方式进行安装，安装完成开始进行主从同步的配置
master：192.168.100.10
slave：192.168.100.20

注意：从数据库服务器上一定要有主数据库服务器上的库、表且表结构要一致。

配置master数据库服务器

#ls -lrt /data/mysqltotal 2121876-rw-r----- 1 mysql mysql 56 May 23 16:06 auto.cnfdrwxr-x--- 2 mysql mysql 8192 May 23 16:06 performance_schemadrwxr-x--- 2 mysql mysql 4096 May 23 16:06 mysqldrwxr-x--- 2 mysql mysql 8192 May 23 16:06 sys-rw-r----- 1 mysql mysql 29924 May 23 16:40 localhost.localdomain.err-rw-r----- 1 mysql mysql 1073741824 May 23 16:41 ib_logfile1-rw-r----- 1 mysql mysql 329 May 23 16:43 mysql-bin.000001-rw-r----- 1 mysql mysql 718 May 23 16:46 mysql-bin.000002-rw-r----- 1 mysql mysql 872 May 23 17:25 mysql-bin.000003-rw-r----- 1 mysql mysql 177 May 23 17:43 mysql-bin.000004drwxr-x--- 2 mysql mysql 52 May 23 17:54 zs-rw-r----- 1 mysql mysql 666 May 23 18:00 mysql-bin.000005-rw-r----- 1 mysql mysql 300 May 23 18:00 ib_buffer_pool-rw-r----- 1 mysql mysql 1104 May 23 18:00 slow_query.log-rw-r----- 1 mysql mysql 174 May 23 18:00 mysql-bin.index-rw-r----- 1 mysql mysql 5 May 23 18:00 localhost.localdomain.pid-rw-r----- 1 mysql mysql 12582912 May 23 18:00 ibtmp1-rw-r----- 1 mysql mysql 41881 May 23 18:05 mysql_error.log-rw-r----- 1 mysql mysql 726 May 23 19:14 mysql-bin.000006-rw-r----- 1 mysql mysql 12582912 May 23 19:15 ibdata1-rw-r----- 1 mysql mysql 1073741824 May 23 19:15 ib_logfile0#vi /etc/my.cnf#log-bin=mysql-bin.000006 server_id=1 #主库为1 从库为2

修改过my.cnf后重启数据库
登陆数据库执行下面的操作：
mysql> grant all privileges on . to ‘test‘@‘%‘ identified by ‘test‘ with grant option;

配置slave数据库服务器

#vim /etc/my.cnfserver_id=2log-bin=slavelog #可开可不开

重启数据库
管理员登陆

mysql> change master to -> master_host="192.168.100.10", -> master_user="test", -> master_password="test", -> master_log_file="mysql-bin.000006", 主查询show master start; -> master_log_pos=0;mysql> show slave status\G; Slave_IO_Running: Yes Slave_SQL_Running: Yes #两个进程状态为yesmysql>show slave status;

工作原理slave_io_running:yes连接主数据库服务器，并把主数据库服务器binlog日志里sql语句拷贝本机的relybinlog日志里。slave_sql_running:yes执行本机relybinlog日志里的sql语句，把数据写到数据库里四、测试主从同步 在主服务器上建库建表删除数据，从服务器会跟着同步;/var/lib/msyql/master.info 记录连接主数据库服务器的信息 relay-log.info 记录中继binlog日志信息localhost-relay-bin.000001 localhost-relay-bin.000002 中继binlog日志localhost-relay-bin.index 保存已有中继binlog日志文件名常用的其他选项适用于master服务器binlog-do-db=name 设置master对哪些库记日志binlog-ignore-db=name 设置master对哪些库不记日志log-slave-updates 记录从库更新，允许链式复制（A-B-C）relay-log=dbsvr2-relay-bin 指定中继日志文件名replicate-do-db=mysql 仅复制指定库，其他库将被忽略，此选项可设置多条(省略时复制所有库)replicate-ignore-db=test 不复制哪些库，其他库将被忽略，ignore-db与go-db只需选用其中一种report-host=dbsvr2 报告给master的主机名或ip地址slave-net-timeout=60 出现网络中断时，重试超时（默认60秒）