Preface
If we want to check out how many slaves in our replication environment.We can execute “show processlit;” on master.Whatif we`d like to check the detail of slaves.We have to execute “show slave statusG” on slaves.
Introduce
pt-salve-find is a tool to find and print the the hierarchy tree of MySQL slaves.It can provide us a simple way to check out whether our slaves are working normally.
Procedure
Usage
1 pt-slave-find [OPTIONS] [DSN]
Common parameter
1 --host //Specify the host your want to connect. 2 --port //Specify the port of the server to connect. 3 --user //Specify the username of target instance. 4 --password //Specify the password of user.
Example
Check out the information on master.
1 [root@zlm1 08:37:58 ~] 2 #pt-slave-find -h192.168.56.100 -P3306 -urepl -prepl4slave 3 192.168.56.100 4 Version 5.7.21-log 5 Server ID 1003306 6 Uptime 23:40:33 (started 2018-07-21T09:01:24) 7 Replication Is not a slave, has 2 slaves connected, is not read_only 8 Filters 9 Binary logging ROW 10 Slave status 11 Slave mode STRICT 12 Auto-increment increment 1, offset 1 13 InnoDB version 5.7.21 14 +- zlm3 15 Version 5.7.21-log 16 Server ID 1023306 17 Uptime 08:04 (started 2018-07-22T08:33:53) 18 Replication Is a slave, has 0 slaves connected, is not read_only 19 Filters 20 Binary logging ROW 21 Slave status 0 seconds behind, running, no errors 22 Slave mode STRICT 23 Auto-increment increment 1, offset 1 24 InnoDB version 5.7.21 25 +- zlm2 26 Version 5.7.21-log 27 Server ID 1013306 28 Uptime 23:40:27 (started 2018-07-21T09:01:30) 29 Replication Is a slave, has 0 slaves connected, is not read_only 30 Filters 31 Binary logging ROW 32 Slave status 0 seconds behind, running, no errors 33 Slave mode STRICT 34 Auto-increment increment 1, offset 1 35 InnoDB version 5.7.21
Check out the information on slaves.
1 [root@zlm1 08:41:57 ~] 2 #pt-slave-find -h192.168.56.101 -P3306 -urepl -prepl4slave 3 192.168.56.101 4 Version 5.7.21-log 5 Server ID 1013306 6 Uptime 23:40:36 (started 2018-07-21T09:01:31) //It shows that the slave has been run almost 24 hours. 7 Replication Is a slave, has 0 slaves connected, is not read_only 8 Filters 9 Binary logging ROW 10 Slave status 0 seconds behind, running, no errors 11 Slave mode STRICT 12 Auto-increment increment 1, offset 1 13 InnoDB version 5.7.21 14 15 [root@zlm1 08:42:07 ~] 16 #pt-slave-find -h192.168.56.102 -P3306 -urepl -prepl4slave 17 192.168.56.102 18 Version 5.7.21-log 19 Server ID 1023306 20 Uptime 08:21 (started 2018-07-22T08:33:54) //This was the newly added slave 10 minutes ago. 21 Replication Is a slave, has 0 slaves connected, is not read_only 22 Filters 23 Binary logging ROW 24 Slave status 0 seconds behind, running, no errors 25 Slave mode STRICT 26 Auto-increment increment 1, offset 1 27 InnoDB version 5.7.21
Summary
- There`re merely several simple connection parameters you need to specify.
- It`s convenient to get the information about slaves on master without executing any commands.
- This tool can also be used to checkout the lag time of slaves.