ProxySQL is a popular database proxy for MySQL/MariaDB servers. This focuses on the possible High availability options for ProxySQL and operations of inbuilt clustering feature in ProxySQL. This tech talk was presented at Mydbops Database Meetup on 27-04-2019 by Aakash M, Database Administrator with Mydbops and Vignesh Prabhu, Database Administrator with Mydbops.

1. Proxysql High Availability
Mydbops Meetup - 3
Presented by
S.Vignesh Prabhu
M.Aakash
www.mydbops.com info@mydbops.com 1

2. About Us
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Aakash .M
Certified MySQL 5.7 DBA, Mydbops
Interested on MySQL Optimization and High Availability systems.
Active MySQL Blogger.
LinkedIn :
https://www.linkedin.com/in/aakash-muthuramalingam-520a77129
Vignesh Prabhu .S
Certified MySQL 5.7 DBA, Mydbops
Interested on MySQL performance and High Availability systems.
Active MySQL Blogger.
LinkedIn : https://www.linkedin.com/in/vignesh-prabhu-s-445827163

3. About Mydbops
● Founded in 2015, HQ in Bangalore India with 150+ customer base across the globe.
● Mydbops is on Database Consulting with core specialization on MySQL and MongoDB Administration and
Support.
● We have expert team with 20+ certified DBA’s providing full time support and currently managing 300+
servers on premises and cloud.
● We help organisations to architect and scale systems in MySQL/MongoDB by implementing the advanced
technologies in industry which are completely open source.
● We are a leading solution provider in the market for all sort of cloud based database deployments and
management.
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4. Mydbops at a GlanceHappy Customers
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5. Agenda
● Introduction
● Key Features
● Ensuring HA
● ProxySQL Clustering
● Concepts
● Implementation
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6. Introduction
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7. Proxysql Introduction
● Proxysql is developed by René Cannaò, who is one of the MySQL Support Engineer.
● Initial release 1.1.0
● Released in the year December 2015
● Latest release 2.0.4
● Take over the failures of the Reverse proxies.
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8. Reverse Proxy
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9. Replication Breakage Handling
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10. Replication Breakage Handling
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11. Proxysql - Features
● Runtime Configurable System
● Granular Query Logging
● Monitoring support
● PMM graphs - Proxysql Exporters
● Mirroring - Performance of Rewritten Query
● Clustering
● SQL intelligence
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12. Basic Proxysql topology
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13. Ensuring HA
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14. High Availability Topology
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15. HA Topology - Virtual IP
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16. Proxysql Clustering
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17. Proxysql Clustering
● Introduced in 1.4.2(Beta)
● Apply Changes from any node
● Easy to make configuration changes for multiple Servers
● Automatic Node Rejoining
● Easy to add new nodes
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18. Prerequisite:
1) Minimum two nodes for proxysql installation.
2) Proxysql with version 1.4.2 or higher.
3) Port Opening - 6032
Pre-Requisites
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19. Proxysql Clustering
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20. 1) Mysql_query_rules
2) Mysql_servers
3) Mysql_users
4) Proxysql_servers
Key Configuration Tables
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21. Concepts
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22. Runtime_checksums_values
How does it work ?
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23. stats_proxysql_servers_checksums
How does it work ?
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24. Making Entry in key tables
How does it work ?
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25. How does it work ?
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26. Checksums_updated
How does it work ?
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27. Flow from Log file:
● ProxySQL detected a change in the checksum for table mysql_users
● MySQL Users are fetched from 172.16.3.130:6032
● MySQL Users are loaded to runtime
● MySQL Users are also saved to disk because cluster_mysql_users_save_to_disk=true
● A new checksum is also detected from 172.16.3.132:6032 , but it matches the local one so there is no
need to sync
● A new checksum is also detected from 172.16.3.131:6032 (that is the same proxysql instance), but it
matches the local one so there is again no need to sync
How does it work ?
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28. Implementation
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29. 1) Define What to sync.
a) admin-checksum_mysql_query_rules
b) admin-checksum_mysql_servers
c) admin-checksum_mysql_users
2) Define Credentials
a) admin-cluster_username & admin-cluster_password
3) Define interval/frequency checks
a) admin-cluster_check_interval_ms
b) admin-cluster_check_status_frequency
Cluster Admin Variables
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30. ● Variables used for saving the changes to the disk
○ admin-cluster_mysql_query_rules_save_to_disk
○ admin-cluster_mysql_servers_save_to_disk
○ admin-cluster_mysql_users_save_to_disk
○ admin-cluster_proxysql_servers_save_to_disk
● Variables used to trigger the synchronization
○ admin-cluster_mysql_query_rules_diffs_before_sync
○ admin-cluster_mysql_servers_diffs_before_sync
○ admin-cluster_mysql_users_diffs_before_sync
○ admin-cluster_proxysql_server_diffs_before_sync
How to implement it ?
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31. Proxysql Servers Table
How to implement it ?
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32. Proxysql Servers Table
mysql> INSERT INTO proxysql_servers (hostname) VALUES ('172.16.3.130'), ('172.16.3.131'),
('172.16.3.132');
Query OK, 3 rows affected (0.00 sec)
mysql> LOAD PROXYSQL SERVERS TO RUNTIME;
Query OK, 0 rows affected (0.01 sec)
mysql> SAVE PROXYSQL SERVERS TO DISK;
Query OK, 0 rows affected (0.01 sec)
How to implement it ?
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33. ● SQL Aware Proxy VS Reverse Proxy
● Key Features of ProxySQL
● Basic Topology
● High Availabilities Topologies
● Clustering Concepts
● Clustering Implementation
Summary
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34. Queries?
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35. Thank You
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