Proxies are building blocks of HA setups for MySQL & MariaDB. They can detect failed nodes and route queries to hosts which are still available. If your master failed and you had to promote one of your slaves, proxies will detect such topology changes and route your traffic accordingly. More advanced proxies can do much more: route traffic based on precise query rules, cache queries or mirror them. They can be even used to implement different types of sharding. Introducing ProxySQL! In this joint webinar with ProxySQL’s creator, René Cannaò, we discuss this new proxy and its key features. We show you how you can deploy ProxySQL using ClusterControl. And we give you an early walk-through of some of the exciting ClusterControl features for ProxySQL that we have planned for its next release. AGENDA 1. Introduction 2. ProxySQL concepts (René Cannaò) - Hostgroups - Query rules - Connection multiplexing - Configuration management 3. Demo of ProxySQL setup in ClusterControl (Krzysztof Książek) 4. Upcoming ClusterControl features for ProxySQL SPEAKERS René Cannaò, Creator & Founder, ProxySQL. René has 10 years of working experience as a System, Network and Database Administrator mainly on Linux/Unix platform. In the last 4-5 years his experience was focused mainly on MySQL, working as Senior MySQL Support Engineer at Sun/Oracle and then as Senior Operational DBA at Blackbird, (formerly PalominoDB). In this period he built an analytic and problem solving mindset and he is always eager to take on new challenges, especially if they are related to high performance. And then he created ProxySQL… Krzysztof Książek, Senior Support Engineer at Severalnines, is a MySQL DBA with experience managing complex database environments for companies like Zendesk, Chegg, Pinterest and Flipboard.

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Your host & some logistics
I'm Jean-Jérôme from the Severalnines Team
and I'm your host for today's webinar!
Feel free to ask any questions in the Questions
section of this application or via the Chat box.
You can also contact me directly via the chat
box or via email: jj@severalnines.com during
or after the webinar.

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About Severalnines and ClusterControl

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What we do
Manage Scale
MonitorDeploy

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ClusterControl Automation & Management
! Provisioning
! Deploy a cluster in minutes
! On-premises or in the cloud (AWS)
! Monitoring
! Systems view
! 1sec resolution
! DB / OS stats & performance advisors
! Configurable dashboards
! Query Analyzer
! Real-time / historical
! Management
! Multi cluster/data-center
! Automate repair/recovery
! Database upgrades
! Backups
! Configuration management
! Cloning
! One-click scaling

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Supported Databases

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Customers

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MySQL & MariaDB load balancing with ProxySQL & ClusterControl:
introduction webinar
February 28, 2017
Krzysztof Książek
Severalnines
krzysztof@severalnines.com
René Cannaò
ProxySQL
rene@proxysql.com
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Agenda

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Agenda
! ProxySQL - introduction
! ProxySQL Internals
! Failover with ProxySQL
! Demo of ProxySQL support in ClusterControl

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ProxySQL - introduction

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Main motivations
! empower the DBAs
! improve operation
! understand and improve performance
! create a proxy layer to shield the database
! High performance and High Availability

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! on-the-fly rewrite of queries
! caching reads outside the database
server
! connection pooling and multiplexing
! complex query routing and read/write split
! load balancing
! real time statistics
! monitoring
ProxySQL Features
! High Availability and Scalability
! seamless failover
! firewall
! query throttling
! query timeout
! query mirroring
! runtime reconfiguration

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Hostgroups and Query Routing
! All backends are grouped into hostgroups
! Hostgroups have logical functionalities

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Basic design

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! HostGroup0 (HG0): Write masters
! HostGroup1( HG1): Read slaves
! Read/Write split
Example of hostgroup setups
! HG0: main write masters
! HG1: main read slaves
! HG2: reporting slaves
! HG3: ad-hoc queries slaves
! HG4: data warehouse write masters
! HG5: data warehouse read slaves
! HG6: remote site servers
! HG7: test servers
! HG8 : mirror for traffic on HG0
! HG9 : mirror for traffic on HG1

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Basic design

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Basic design

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Clustered ProxySQL Architecture

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Clustered ProxySQL at scale
! Tested with:
! 8 app servers with 3k clients’ connections each (24k total)
! 4 middle layer proxysqls processing 4k connections each from local proxysqls (16k total)
! 256 backends/shard (meaning 256 routing rules) processing 600 connections each (150k
total)
! Single ProxySQL was tested with up to 150k connections
! As today, ProxySQL is able to process up to 750k QPS

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ProxySQL Internals

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ProxySQL Modules

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Queries Processor
! Based on Queries Rules
! Defines what to cache
! Defines the hostgroup target
! Timeout/delay
! Firewall
! Mirroring
! Rewrite queries

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! Complex rules to match incoming traffic:
! regex on query
! regex on digest text
! username
! schemaname
Queries rules
! Complex rules to match incoming traffic:
! Source IP address
! Bind IP address/port
! digest
! Rules can be chained

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! Caching on the wire
! Internal key/value storage
! In memory only
! Pattern based
! Expired by timeout
Queries Cache and Rewrite
! Rewrite on the wire
! Regex match/replace on query on digest text
! Optionally cached or mirrored

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User Authentication
! Credentials stored in the proxy
! User login always possible (even without backends)
! Max connections
! Login credentials are encrypted

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Hostgroups Manager
! Management of servers
! Track servers status
! Tightly integrated with the connections pool

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Connection Pool
! Reduced the overhead of creating new connections, and are recycled when not in use
! One to many connections
! Multiplexing & maximum connections
! Auto-reconnect and automatic re-execution of queries
! Failover management

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Auto-reconnect and re-execution
! Automatic detection of failures
! Graceful handling
! Auto-reconnect when possible
! Pause until a backend becomes available
! Re-execution of queries

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Multiplexing
! Reduce the number of connections against mysqld (configurable)
! Many clients connections (tens of thousands) can use few backend connections (few hundreds)
! Tracks connection status (transactions, user variables, temporary tables, etc)
! Order by waiting time

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Monitoring Module
! It monitors backends and collects metrics
! Monitors replication lag and shun hosts
! Monitors read_only variables (replication hostgroups)
! Ping and terminates unresponsive nodes

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Failover with ProxySQL

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Failover
! 2 phases process:
! remove host
! add host
! Seamless switchover:
! https://severalnines.com/blog/how-proxysql-adds-failover-and-query-control-your-mysql-replication-setup
! http://proxysql.blogspot.com/2015/09/proxysql-tutorial-seamless-replication.html
! Managed by external process
! Switchover in less than 1 second

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Distributed failover
! Multiple ProxySQL are available in a network
! Failover managed by an external process that:
! remove host from each ProxySQL instance
! add new host into each ProxySQL instance
! Manager is not part of ProxySQL.
! ClusterControl can be used to detect master failure and perform a failover

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Replication hostgroups
! Constantly monitor read_only variable
! Defines replication topology as writer(s)/readers(s)
! Automatically re-assign servers to the right hostgroup
! Possible to define unlimited number of replication clusters

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Master switch with ClusterControl and ProxySQL

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Failover highlight
! improve failover time as perceived by the application
! prevent errors sent to the application
! perform transparent database failovers: gracefully redirecting traffic without the application
knowing
! existing applications do not have to be rewritten to autoreconnect since connections are not
lost from failovers

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Demo

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Thank You!
! Severalnines resources on ProxySQL
! https://severalnines.com/blog/using-clustercontrol-deploy-and-configure-proxysql-top-mysql-replication
! https://severalnines.com/blog/sharding-mysql-mysql-fabric-and-proxysql
! https://severalnines.com/blog/how-proxysql-adds-failover-and-query-control-your-mysql-replication-setup
! https://severalnines.com/blog/how-set-read-write-split-galera-cluster-using-proxysql
! Install ClusterControl:
! https://severalnines.com/download-clustercontrol-database-management-system
! Contact: jj@severalnines.com