这篇文章主要介绍“Mysql一主多从如何部署”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“Mysql一主多从如何部署”文章能帮助大家解决问题。
下载tar.gz包
选择redhat版本
安装
1.linux系统上创建mysql1用户
useradd mysql12.将tar.gz包上传到服务器上并且解压
tar -zxvf mysql-5.7.31-linux-glibc2.12-x86_64.tar.gz3.将mysql-5.7.31-el7-x86_64目录下的文件mv到 /home/mysql1下
4.mkdir -p /home/mysql1/data 文件存储mysql1数据目录
mkdir -p /home/mysql1/data5.将/etc/my.cfg文件复制到mysql家目录下
cp /etc/my.cnf /home/mysql1/6.对/home/mysql1下赋权
chmod -R 755 /home/mysq1lchown mysql:mysql -R /home/mysql1/datachmod 777 /home/mysql1/data7.修改mysql配置文件
vi /home/mysql1/my.cnf
[mysqld]user = port = 3307basedir = /home/mysql1datadir = /home/mysql1/datasocket = /home/mysql1/mysql.sockpid_file = /home/mysql1/mysql.pidlog_error = /home/mysql1/data/error.log#binlog日志文件log_bin = /home/mysql1/data/mysql-binrelay_log = /home/mysql1/data/relay-binslow_query_log_file = /home/mysql1/data/slow.log#binlog过期清理时间expire_logs_days = 15log-slave-updates = 1log_bin_trust_function_creators = 1lower_case_table_names = 1max_connections = 3000max_connect_errors = 1000000 # 每个实例的id都设置成不一样的，比如a主机，3307 b主机设置成23307，c主机设置成33307，后面1主2从会用到server-id = 3307 autocommit = 1# pool_size根据实际情况进行更新innodb_buffer_pool_size = 40Ginnodb_buffer_pool_instances = 8innodb_write_io_threads = 16innodb_read_io_threads = 16#mysql复制主要有三种方式：基于SQL语句的复制(statement-based replication, SBR)，基于行的复制(row-based replication, RBR)，混合模式复制(mixed-based replication, MBR)。对应的，binlog的格式也有三种：STATEMENT，ROW，MIXEDbinlog_format = ROWgtid_mode = onenforce_gtid_consistency = 1innodb_flush_log_at_trx_commit = 1 #add 2 innodb_thread_concurrency = 20innodb_print_all_deadlocks = 1innodb_flush_method = O_DIRECTinnodb_io_capacity = 8000innodb_io_capacity_max = 15000enforce_gtid_consistency = 1binlog_rows_query_log_events = 1character_set_server = utf8mb4default-storage-engine = INNODBtransaction_isolation = READ-COMMITTEDmax_allowed_packet = 67108864event_scheduler = 1slow_query_log = onexplicit_defaults_for_timestamp = 1 master_info_repository = TABLErelay_log_info_repository = TABLErelay_log_recovery = 1relay_log_purge = 0 slave_rows_search_algorithms = 'INDEX_SCAN,HASH_SCAN'slave_parallel_type = LOGICAL_CLOCKslave_parallel_workers = 16slave_preserve_commit_order = 1slave_transaction_retries = 64sync_relay_log = 0sync_relay_log_info = 0sync_master_info = 0sync_binlog = 1collation_server = utf8mb4_binskip_name_resolve = 1 plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"rpl-semi-sync-master-enabled = 1rpl-semi-sync-slave-enabled = 18.数据文件初始化
初始化
./mysqld --defaults-file=/home/mysql1/my.cnf --initialize --basedir=/home/mysql1 --datadir=/home/mysql1/data --user=mysql1启动
./mysqld_safe --defaults-file=/home/mysql1/my.cnf --user=mysql1 &查看mysql进程已经起来，并且监听3307接口
本机登陆，root的初始密码可以在errorlog中找到
cat error.log | grep "temporary password"
本机登录指定sock文件以及指定端口及输入临时密码
./mysql -uroot -P3307 -S /home/mysql1/mysql.sock -p登录后修改root密码
set password=password('XXXXXXXX'); 修改密码flush privileges;赋予权限
grant all privileges on *.* to 'root'@'%' identified by 'XXXXXXX' with grant option;flush privileges;停止服务
./mysqladmin shutdown -uroot -p******** -S /home/mysql1/mysql.sock使用mysql客户端datagrip连接mysql成功
通过如上相同操作安装从库，只修改配置文件相关信息，并且初始化，并且客户端连接
在master数据库上执行
创建repl用户并且赋予同步权限
CREATE USER 'repl' IDENTIFIED BY 'slavepass';GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%' identified by 'slavepass';flush privileges;
查看master状态
SHOW MASTER STATUS\G;
在slave上面执行
配置slave从节点的master节点以及binlog偏移位置等
CHANGE MASTER TO MASTER_HOST='master地址',MASTER_USER='repl',MASTER_PASSWORD='slavepass',MASTER_LOG_FILE='mysql-bin.000003', #为master的log_fileMASTER_LOG_POS=1597, #master的POSMASTER_PORT=3307;
启动slave同步进程以及查看slave状态
start slave; #启动slave同步进程show slave status\G;
测试
在mysql1中创建testdb，使用datagrip在mysql2中即可查看从mysql1中同步的新增的库以及数据，不过datagrip需要刷新下客户端。
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