集群数据库：Mysql数据库一主多从部署的实现步骤

useradd mysql1

tar -zxvf mysql-5.7.31-linux-glibc2.12-x86_64.tar.gz

mkdir -p /home/mysql1/data

cp /etc/my.cnf /home/mysql1/

chmod -R 755 /home/mysq1l

chown mysql:mysql -R /home/mysql1/data

chmod 777 /home/mysql1/data

[mysqld]
user =
port = 3307
basedir = /home/mysql1
datadir = /home/mysql1/data
socket = /home/mysql1/mysql.sock
pid_file = /home/mysql1/mysql.pid
log_error = /home/mysql1/data/error.log
#binlog日志文件
log_bin = /home/mysql1/data/mysql-bin
relay_log = /home/mysql1/data/relay-bin
slow_query_log_file = /home/mysql1/data/slow.log
#binlog过期清理时间
expire_logs_days = 15
log-slave-updates = 1
log_bin_trust_function_creators = 1
lower_case_table_names = 1
max_connections = 3000
max_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 = 40G
innodb_buffer_pool_instances = 8
innodb_write_io_threads = 16
innodb_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，MIXED
binlog_format = ROW
gtid_mode = on
enforce_gtid_consistency = 1
innodb_flush_log_at_trx_commit = 1
#add 2
innodb_thread_concurrency = 20
innodb_print_all_deadlocks = 1
innodb_flush_method = O_DIRECT
innodb_io_capacity = 8000
innodb_io_capacity_max = 15000
enforce_gtid_consistency = 1
binlog_rows_query_log_events = 1
character_set_server = utf8mb4
default-storage-engine = INNODB
transaction_isolation = READ-COMMITTED
max_allowed_packet = 67108864
event_scheduler = 1
slow_query_log = on
explicit_defaults_for_timestamp = 1
master_info_repository = TABLE
relay_log_info_repository = TABLE
relay_log_recovery = 1
relay_log_purge = 0
slave_rows_search_algorithms = 'INDEX_SCAN,HASH_SCAN'
slave_parallel_type = LOGICAL_CLOCK
slave_parallel_workers = 16
slave_preserve_commit_order = 1
slave_transaction_retries = 64
sync_relay_log = 0
sync_relay_log_info = 0
sync_master_info = 0
sync_binlog = 1
collation_server = utf8mb4_bin
skip_name_resolve = 1
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl-semi-sync-master-enabled = 1
rpl-semi-sync-slave-enabled = 1

./mysqld --defaults-file=/home/mysql1/my.cnf --initialize --basedir=/home/mysql1 --datadir=/home/mysql1/data --user=mysql1

./mysqld_safe --defaults-file=/home/mysql1/my.cnf --user=mysql1 &

cat error.log | grep "temporary password"

./mysql -uroot -P3307 -S /home/mysql1/mysql.sock -p

set password=password('XXXXXXXX'); 修改密码
flush privileges;

grant all privileges on *.* to 'root'@'%' identified by 'XXXXXXX' with grant option;
flush privileges;

./mysqladmin shutdown -uroot -p******** -S /home/mysql1/mysql.sock

CREATE USER 'repl' IDENTIFIED BY 'slavepass';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%' identified by 'slavepass';
flush privileges;

SHOW MASTER STATUS\G;

CHANGE MASTER TO MASTER_HOST='master地址',
MASTER_USER='repl',
MASTER_PASSWORD='slavepass',
MASTER_LOG_FILE='mysql-bin.000003', #为master的log_file
MASTER_LOG_POS=1597, #master的POS
MASTER_PORT=3307;

start slave; #启动slave同步进程
show slave status\G;