MySQL5.7.21开启Gtid配置主从复制

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一、环境：

mysql 主库master：10.0.0.101 172.168.1.101
mysql 从库slave：10.0.0.103 172.168.1.103
mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz 二进制安装完成

二、主从库/etc/my.cf文件参数介绍

mysql主库完整my.cnf配置文件

[root@slave01 ~]# cat /etc/my.cnf
[client]
port            = 3306
socket          = /tmp/mysql.sock

[mysql]
no-auto-rehash

[mysqld]
user    = mysql
port    = 3306
socket  = /tmp/mysql.sock
basedir = /usr/local/mysql
datadir = /data/mysql/data

back_log = 2000
open_files_limit = 1024
max_connections = 800
max_connect_errors = 3000
max_allowed_packet = 33554432
external-locking = FALSE
character_set_server = utf8

#binlog
log-slave-updates = 1
binlog_format = row
log-bin = /data/mysql/logs/bin-log/mysql-bin
expire_logs_days = 5
sync_binlog = 1
binlog_cache_size = 1M
max_binlog_cache_size = 1M
max_binlog_size = 2M

#replicate-ignore-db=mysql
skip-name-resolve
slave-skip-errors = 1032,1062
skip_slave_start=1

###relay log
relay-log = /data/mysql/logs/relay-log/relay-bin
relay-log-info-file = /data/mysql/relay-log.info

###slow_log
slow_query_log = 1
slow-query-log-file = /data/mysql/logs/mysql-slow.log

log-error = /data/mysql/logs/error.log

##GTID
server_id = 1103
gtid_mode=on
enforce_gtid_consistency=on

event_scheduler = ON
innodb_autoinc_lock_mode = 1
innodb_buffer_pool_size = 10737418
innodb_data_file_path = ibdata1:10M:autoextend
innodb_data_home_dir = /data/mysql/data
innodb_log_group_home_dir = /data/mysql/data

innodb_file_per_table = 1
innodb_flush_log_at_trx_commit = 2
innodb_flush_method = O_DIRECT
innodb_io_capacity = 2000
innodb_log_buffer_size = 8388608
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 50
innodb_open_files = 512
innodb_read_io_threads = 8
innodb_thread_concurrency = 20
innodb_write_io_threads = 8
innodb_lock_wait_timeout = 10
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
key_buffer_size = 3221225472
innodb_log_file_size = 1G
local_infile = 1
log_bin_trust_function_creators = 1
log_output = FILE
long_query_time = 1

myisam_sort_buffer_size = 33554432
join_buffer_size = 8388608
tmp_table_size = 33554432
net_buffer_length = 8192
performance_schema = 1
performance_schema_max_table_instances = 200

query_cache_size = 0
query_cache_type = 0
read_buffer_size = 20971520
read_rnd_buffer_size = 16M
max_heap_table_size = 33554432
bulk_insert_buffer_size = 134217728
secure-file-priv = /data/mysql/tmp

sort_buffer_size = 2097152
table_open_cache = 128
thread_cache_size = 50
tmpdir = /data/mysql/tmp
slave-load-tmpdir = /data/mysql/tmp
wait_timeout = 120
transaction_isolation=read-committed
innodb_flush_log_at_trx_commit=0
lower_case_table_names=1
[mysqldump]
quick
max_allowed_packet = 64M
[mysqld_safe]
log-error = /data/mysql/logs/error.log
pid-file = /data/mysql/mysqld.pid

mysql从库完整my.cnf配置文件介绍：

mysql的slave从库的配置文件/etc/my.cnf中参数只是sever_id和主库的不一样，其他的参数都保持一致

三、配置GTID参数介绍：

对于GTID的配置，主要修改配置文件中与GTID特性相关的几个重要参数(建议使用mysql-5.6.5以上版本)，如下：

1、主库：
[mysqld]
#GTID:
server_id=54
gtid_mode=on
enforce_gtid_consistency=on

#binlog
log_bin=master-binlog
log-slave-updates=1    
binlog_format=row

#relay log
skip_slave_start=1            

2、从库：
[mysqld]
#GTID:
gtid_mode=on
enforce_gtid_consistency=on
server_id=197

#binlog
log-bin=slave-binlog
log-slave-updates=1
binlog_format=row

#relay log
skip_slave_start=1

四、配置主从库

mysql master上操作:

mysql -uroot -p'123456' -e "grant replication slave on *.* to novelrep@'172.168.1.103' identified by 'JuwoSdk21TbUser'; flush privileges;"
 [root@master01 ~]# mysqldump -uroot -p'123456' -B -A -F  --master-data=2 --single-transaction  --events|gzip >/opt/juwo_$(date +%F).sql.gz
mysqldump: [Warning] Using a password on the command line interface can be insecure.
Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed suppressed parts of the database. If you don't want to restore 

GTIDs, pass --set-gtid-purged=OFF. To make a complete dump, pass --all-databases --triggers --routines --events.

mysql slave上操作:

mysql -uroot -p'123456' -e "source /root/juwo_$(date +%F).sql"
主库上的dump出数据在导入到slave过程中报错：

ERROR 1840 (HY000) at line 24: @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty

mysql -uroot -p'123456' -e "CHANGE MASTER TO MASTER_HOST='172.168.1.101',MASTER_PORT=3306,MASTER_USER='novelrep',MASTER_PASSWORD='JuwoSdk21TbUser',MASTER_AUTO_POSITION = 1;start slave;show slave 

status\G" |grep -i "yes"

slave上执行完以上操作后，show slave status\G,查看到主从复制，slave上的sql线程报错，主从复制配置失败

五、重新配置主从复制：

参考一下文档：
https://www.cnblogs.com/tonnytangy/p/7779164.html
当前GTID_EXECUTED参数已经有值，而从master主库倒出来的dump文件中包含了SET @@GLOBAL.GTID_PURGED的操作

解决方法：

方法一：reset mater

这个操作可以将当前slave库的GTID_EXECUTED值置空

方法二：--set-gtid-purged=off

在dump导出master数据时，添加--set-gtid-purged=off参数，避免将master上的gtid信息导出，然后再导入到slave库

本文档同时采用了上述2个步骤：

master 库操作：

mysql -uroot -p'123456' -e "reset mater;"
mysql -uroot -p'123456' -e "grant replication slave on *.* to novelrep@'172.168.1.103' identified by 'JuwoSdk21TbUser'; flush privileges;"
mysqldump -uroot -p'123456' -B -A -F --set-gtid-purged=OFF  --master-data=2 --single-transaction  --events|gzip >/opt/juwo_$(date +%F).sql.gz

mysql slave上操作:

mysql -uroot -p'123456' -e "source /root/juwo_$(date +%F).sql"

主库上的dump出数据在导入到slave过程中一切正常

mysql -uroot -p'123456' -e "CHANGE MASTER TO MASTER_HOST='172.168.1.101',MASTER_PORT=3306,MASTER_USER='novelrep',MASTER_PASSWORD='JuwoSdk21TbUser',MASTER_AUTO_POSITION = 1;start slave;show slave 

status\G" |grep -i "yes"

slave上执行完以上操作后，show slave status\G,查看到主从复制，slave上的IO线程和sql线程都是yes,到此mysql的GTID模式的主从配置完成

参考文档：
https://www.2cto.com/database/201801/710551.html

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