服务器中已经启动了3306端口的数据库，资源有限还需要做一个3307端口的从库，需要在一个系统中启动多个数据库实例
拷贝一份实例执行程序
cd /usr/local
cp -ar percona-Server-8.0.18 percona-Server-8.0.18_3307
ln -s percona-Server-8.0.18_3307 mysql_3307
1.备份主库，并拉取到从库服务器中
/usr/local/xtrabackup/bin/xtrabackup --defaults-file=/etc/my.cnf --user=root --password='pass' --host=localhost --port=3306 -S /tmp/mysql.sock --parallel=4 --backup --apply-log-only --target-dir=/opt/
2.配置参数
# vim /etc/my_3307.cnf
## 配置文件模板，需要根据机器配置进行适当的调整
## my.cnf for MySQL 5.7/8.0
## 本配置文件主要适用于MySQL 5.7/8.0版本
#
[client]
port = 3307
socket = /tmp/mysql_3307.sock
ssl-mode=DISABLED
[mysql]
prompt = "\[email protected] \R:\m:\s [\d]> "
no-auto-rehash
[mysqld]
user = mysql
port = 3307
basedir = /usr/local/mysql_3307
datadir = /data/mysql_data_3307
socket = /tmp/mysql_3307.sock
pid-file = /data/mysql_data_3307/mysql.pid
character-set-server = utf8mb4
skip_name_resolve = 1
#设置默认时区
#default_time_zone = "+8:00"
collation-server = utf8mb4_unicode_ci
default_authentication_plugin = mysql_native_password
skip-character-set-client-handshake
open_files_limit = 65535
back_log = 1024
max_connections = 1000
max_connect_errors = 1000000
table_open_cache = 1024
table_definition_cache = 1024
table_open_cache_instances = 64
thread_stack = 512K
external-locking = FALSE
max_allowed_packet = 512M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 1500
interactive_timeout = 240
wait_timeout = 240
tmp_table_size = 32M
max_heap_table_size = 128M
slow_query_log = 1
log_timestamps = SYSTEM
slow_query_log_file = /data/mysql_data_3307/slow.log
log-error = /data/mysql_data_3307/error.log
long_query_time = 0.8
log_queries_not_using_indexes =1
log_throttle_queries_not_using_indexes = 60
min_examined_row_limit = 100
log_slow_admin_statements = 1
log_slow_slave_statements = 1
server-id = 1907
#log-bin的文件名称采用前缀mysql-bin.XXX
log-bin = mysql-bin
sync_binlog = 1
binlog_cache_size = 4M
max_binlog_cache_size = 2G
max_binlog_size = 1G
#注意：MySQL 8.0开始，binlog_expire_logs_seconds选项也存在的话，会忽略expire_logs_days选项,索性这里注释
#binlog_expire_logs_seconds = 50
master_info_repository = TABLE
relay_log_info_repository = TABLE
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
#自定义
relay-log = mysql-relay-bin
relay-log-index = relay.index
##并发复制
slave-parallel-type = LOGICAL_CLOCK
slave-parallel-workers = 0
##跳过slave进程启动参数
#skip-slave-start
##如果实例为从库，则需要设置为on
read_only = on
super_read_only = on
slave-rows-search-algorithms = 'INDEX_SCAN,HASH_SCAN'
binlog_format = row
binlog_checksum = 1
relay_log_recovery = 1
relay-log-purge = 1
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
bulk_insert_buffer_size = 64M
#----------------Myisam--------------------------------#
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 512M
myisam_repair_threads = 1
lock_wait_timeout = 120
explicit_defaults_for_timestamp = 1
innodb_thread_concurrency = 0
innodb_sync_spin_loops = 100
innodb_spin_wait_delay = 30
transaction_isolation = REPEATABLE-READ
#innodb_additional_mem_pool_size = 16M
innodb_buffer_pool_size = 2G
innodb_buffer_pool_instances = 4
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_data_file_path = ibdata1:1G;ibdata2:1G:autoextend
innodb_log_group_home_dir = /data/mysql_data_3307
innodb_flush_log_at_trx_commit = 1
innodb_log_buffer_size = 128M
innodb_log_file_size = 2G
innodb_log_files_in_group = 2
innodb_max_undo_log_size = 4G
innodb_undo_directory = /data/mysql_data_3307/undolog
#The setting INNODB_UNDO_TABLESPACES is deprecated and is no longer used If you need more, please use CREATE UNDO TABLESPACE
#innodb_undo_tablespaces = 95
#innodb_undo_tablespaces = 3
# 根据您的服务器IOPS能力适当调整
# 一般配普通SSD盘的话，可以调整到 10000 - 20000
# 配置高端PCIe SSD卡的话，则可以调整的更高，比如 50000 - 80000
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_sync = 0
innodb_flush_neighbors = 0
innodb_write_io_threads = 8
innodb_read_io_threads = 8
innodb_purge_threads = 4
innodb_page_cleaners = 4
innodb_open_files = 65535
innodb_max_dirty_pages_pct = 50
innodb_flush_method = O_DIRECT
innodb_lru_scan_depth = 4000
innodb_checksum_algorithm = crc32
innodb_lock_wait_timeout = 10
innodb_rollback_on_timeout = 1
innodb_print_all_deadlocks = 1
innodb_file_per_table = 1
innodb_online_alter_log_max_size = 8G
innodb_stats_on_metadata = 0
#注意：MySQL 8.0.16开始删除该选项
#internal_tmp_disk_storage_engine = InnoDB
# some var for MySQL 8
log_error_verbosity = 3
innodb_print_ddl_logs = 1
#若在启动时binlog_expire_logs_seconds和expire_logs_days参数都设置为非0值,则使用binlog_expire_logs_seconds值，expire_logs_days值则失效并对其发出告警信息。
#若在MySQL启动时inlog_expire_logs_seconds和expire_logs_days 都没设置值，则使用默认值的 binlog_expire_logs_seconds值
binlog_expire_logs_seconds = 2592000
#innodb_dedicated_server = 0
innodb_status_file = 1
#注意: 开启 innodb_status_output & innodb_status_output_locks 后, 可能会导致log-error文件增长较快
innodb_status_output = 0
innodb_status_output_locks = 0
#performance_schema
performance_schema = 1
performance_schema_instrument = '%memory%=on'
performance_schema_instrument = '%lock%=on'
#innodb monitor
innodb_monitor_enable = "module_innodb"
innodb_monitor_enable = "module_server"
innodb_monitor_enable = "module_dml"
innodb_monitor_enable = "module_ddl"
innodb_monitor_enable = "module_trx"
innodb_monitor_enable = "module_os"
innodb_monitor_enable = "module_purge"
innodb_monitor_enable = "module_log"
innodb_monitor_enable = "module_lock"
innodb_monitor_enable = "module_buffer"
innodb_monitor_enable = "module_index"
innodb_monitor_enable = "module_ibuf_system"
innodb_monitor_enable = "module_buffer_page"
innodb_monitor_enable = "module_adaptive_hash"
[mysqldump]
quick
max_allowed_packet = 512M
3.初始化端口为 3307 的数据库
/usr/local/mysql_3307/bin/mysqld --defaults-file=/etc/my_3307.cnf --initialize-insecure --user=mysql --basedir=/usr/local/mysql_3307 --datadir=/data/mysql_data_3307
# 启动端口为3307的mysql数据库，观察能否正常启动
nohup /usr/local/percona-Server-8.0.18_3307/bin/mysqld_safe --defaults-file=/etc/my_3307.cnf &
# 进入数据库，关闭数据库
# mysql -P 3307 -S /tmp/mysql_3307.sock -uroot -p
[email protected] 09:29: [(none)]> shutdown；
4.将备份出来的数据还原为从库
# rm -rf /data/mysql_data_3307/*
# 应用日志
/usr/local/xtrabackup/bin/xtrabackup --defaults-file=/etc/my_3307.cnf --user=root --password= --prepare --apply-log-only --target-dir=/opt/198.11.172.136_db/full_2020-11-06_10-04-01_5
/usr/local/xtrabackup/bin/xtrabackup --defaults-file=/etc/my_3307.cnf --copy-back --rsync --target-dir=/opt/198.11.172.136_db/full_2020-11-06_10-04-01_5
# chown -R mysql.mysql /data/mysql_data_3307/
# 在主库创建复制用户
CREATE USER 'rep'@'%' IDENTIFIED WITH mysql_native_password BY 'wsdb123';
grant replication slave on *.* to 'rep'@'%';
flush privileges;
# 启动主从同步
change master to master_host='1.1.1.1',master_port=3306,master_user='rep',master_password='wsdb123',master_auto_position=1;
start slave;