table of Contents:
[0] Experimental demand
cascading replication, 201 primary library, from the library of 202/203 for both the primary library, from the library 203 to 202
[1] Experimental Environment
cascade: A-> B-> C
Practice ideas:
(1) a direct holding of xtrabackup is perfect to B and C can be further away
(2) and then set gtid_purged, can finally change master;
[2] operation
[2.0] profile my.cnf
[2.1] in the master library creating a user copy 201
[2.2] 201 creates the test data in the main database
[2.3] backup and restore
[2.4] Construction of the cascade master copy from
[2.5] verification
text:
[0] experiment needs
Cascading replication, 201 primary library, from the library of 202/203 for both the primary library, from the library 203 to 202
General recommendations stage cascade, as described above, is not recommended more levels.
[1] experimental environment
Operating System: CentOS 7.5
Database Version: MySQL 5.7.24
Database Schema: the master copy, based on the primary structures 3 library from the library, using lossless Xtrabackup + GTID + Replicable
A: Main Library IP: 192.168.1.201 port: 3306
B: main library IP: 192.168.1.202 port: 3306
C: Main Library IP: 192.168.1.203 port: 3306
Cascade: A-> B-> C
Simple ideas:
Initialize all equipment (. 1) with A, B, and B as the first from the main library A. Cullen
(2) generating at least a B et gtid transaction is stopped io thread B, then initialize all equipment B to C.
(3) C After all equipment to initialize B, and then arranged B-> C from master
Practical ideas:
(1) is directly take xtrabackup A to B and C, all equipment can be far
(2) then set gtid_purged, can finally change master;
[2] Operation
[2.0] configuration file my.cnf
#replication_new log_bin = / MySQL / log / 3306 / mysql- bin # open binlog log_bin_index = / MySQL / log / 3306 / mysql- bin.index binlog_format = Row binlog_rows_query_log_events = ON max_binlog_size = 2048 the bind -address = 0.0 . 0.0 server_id = 2,013,306 # Always remember to modify expire_logs_days = 7 # binlog more than seven days of cleaning up innodb_support_xa = 1 binlog_cache_size = 1M log_bin_trust_function_creators= 1 # synchronization procedures, functions, triggers the innodb_flush_log_at_trx_commit = 1 sync_binlog = 1 Transaction -isolation = Read-The committed #slave Parameter if it is from the library, sure release #relay_log = / MySQL / log / 3306 / relaylog / MySQL- Relay .log #read_only = . 1 #slave -parallel-type = LOGICAL_CLOCK #slave -parallel-Workers = . 4 #master_info_repository = Table #master_info logged to mysql.slave_master_info #relay_log_info_repository = Table #relay_log will be recorded, mysql.slave_relay_log_info #relay_log_recovery = . 1 #slave_skip_errors = ddl_exist_errors #slave_preserve_commit_order = . 1 # . 5 .7 reinforcing semi-synchronous # If 5. The . 7 , together with the foregoing parameters loose_, as in the following, if 5. The . 6 is used directly = rpl_semi_sync_master_enabled . 1 or the like Enough. # 5.7 I do here is directly enhance the semi-synchronous (loseless Semisynchronous) PLUGIN_DIR = / MySQL / App / MySQL / lib / plugin / plugin_load = rpl_semi_sync_master = semisync_master.so; rpl_semi_sync_slave = semisync_slave.so loose_rpl_semi_sync_master_enabled = 1 #MySQL open the main semi-synchronous replication (rpl_semi_sync_master_enabled) loose_rpl_semi_sync_slave_enabled = . 1 # MySQL5.6 open from the semi-synchronous replication loose_rpl_semi_sync_master_timeout = 5000 # 5 seconds time-out, cut back to asynchronous rpl_semi_sync_master_wait_for_slave_count = . 1 # ack 1 th slave receives at least the SPDC rpl_semi_sync_master_wait_point = AFTER_SYNC #MySQL . 5 method .7, AFTER_SYNC ( default value, enhanced semi-synchronous) & AFTER_COMMIT (conventional semi-synchronous) #GTID MODE gtid_mode = ON enforce_gtid_consistency = . 1 log -slave-Updates = . 1
[2.1] 201 created copy the user in the main library
create user 'rpl'@'192.168.1.%' identified by '123456'; grant replication slave on *.* to 'rpl'@'192.168.1.%'; flush privileges; select user,host from mysql.user;
[2.2] 201 to create test data in the main library
- [2.2.1] constructed test test1, test2, test3 table in the library and test library. Table test4 run business has been used to simulate the Create Database Test; use Test; Create Table test1 (ID int ); INSERT INTO test1 values ( . 1 ); Create Table test2 (ID int ); INSERT INTO test2 values ( 2 ); Create Table Test3 (ID int ); INSERT INTO Test3 values ( . 3 ); the commit ; Create Table test4 (ID int ); INSERT INTO test4 values ( . 4 ); the commit ; - [2.2.2] sp_test4 configured stored procedure to insert test4 cycle table, simulation run business use Test; drop Procedure IF EXISTS sp_test4; DELIMITER $$ Create Procedure sp_test4 () the begin DECLARE n- int ; SET n- = . 11 ; the while (n- <= 20 is ) do INSERT INTO test.test4values(n); commit; set n=n+1; end while; end $$ delimiter ; -- 【2.2.3】构造事件，来调度sp_test4过程 use test; set global event_scheduler=1; delimiter $$ create event if not exists event_test4 on schedule every 5 second on completion preserve enable do begin call sp_test4(); end $$ DELIMITER; - To prevent the test data amount accumulated lead Caton, I am here five hours to do a TRUNCATE DELIMITER $$ the Create Event IF not EXISTS event_truncate_test4 ON Schedule Every 5 hour ON Completion preserve enable do the begin TRUNCATE the Table test.test4; End $$ delimiter;
[2.3] to back up and restore
In the master library # A: 201 innobackupex --defaults File = / etc / -uroot--p123456 the my.cnf --no-timestamp /mysql/backup/full.bak
# library from B / C: 202, 203,
SCP - [email protected] R & lt: /mysql/backup/full.bak / MySQL / Backup /
innobackupex --apply-Memory---user = log # 800M /mysql/backup/full.bak application the redo / use the undo
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mkdir Data
innobackupex = --defaults-File / etc / --copy the my.cnf # copy-Back /mysql/backup/full.bak/ reduction
chown -R & lt MySQL: MySQL / MySQL
the chmod 755 -R & lt / MySQL
[2.4] Construction of the cascade master copy
#, Info file or binlog_info file found in xtrabackup backup gtid;
stop slave;
reset master;
reset slave all;
set session sql_log_bin=0; set global gtid_purged='de853101-b165-11e9-900a-000c291f4171:1-1697'; set session sql_log_bin=1; change master to master_host='192.168.1.202', master_user='rpl', master_password='123456', master_auto_position=1;
# Verification from the master, in the implementation from the library
Show Slave Status \ G
Show PROCESSLIST;
SELECT COUNT (. 1) from test.test4;
[2.5] verification
# In the master library A: 201 performs
Create Database test1;
Create Table test1.test1 (int ID);
INSERT INTO test1.test1 values (. 1);
the commit;
SELECT * from test1.test1;
# three verification database
select * from test1 .test1;