Postgres & Red Hat Cluster Suite

© 2014 EnterpriseDB Corporation. All rights reserved. 1

What is Your High Availability Plan? Devrim Gündüz

Principal Systems Engineer EnterpriseDB


•  Introduction to EnterpriseDB •  Postgres clustering options

•  What is Red Hat Cluster Suite? •  RHCS solves important High Availability problems •  RHCS implementation basics

•  Tips for selecting hardware •  PostgreSQL installation tips for RHCS •  Q & A

Agenda


•  PostgreSQL contributor, and advocate

for more than 12 years

•  Responsible for PostgreSQL official YUM repository

•  Fedora contributor since 2006

•  Principal Systems Engineer at EDB since 2011

Your Presenter - Devrim Gündüz

© 2013 EDB All rights reserved 8.1. 4

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Postgres Clustering Options


Postgres: Several Clustering Options •  No single definition for word “cluster”

•  Solutions for different problems

•  Popular clustering alternatives

•  Where does RHCS stand in here? −  Actually “Red Hat High Availability Add-on”

Bucardo Multimaster replication PGpool Load balancing, connection pooling PL/Proxy Database partitioning Postgres-XC Write-scalable synchronous multimaster

Skytools WAL shipping, queuing, and replication Slony Active-passive (+cascading) replication xDB FM EDB Failover Manager (details on next slide)


EDB EDB Failover Manager creates fault tolerant database clusters to minimize downtime when a master database fails by keeping data online in High Availability configurations

FAILOVER MANAGER Master

Streaming Replica

Clients

Witness

Network / Internet

The MASTER is down!

I agree! Take control now!


Red Hat High Availability Add-on


•  Open Source Clustering Solution

•  Supports a wide range of hardware

•  Developed by Red Hat, with the community

•  Relatively low cost

•  No data loss

•  Requires a Red Hat Enterprise Linux base subscription

Red Hat High Availability Add-on


Red Hat Cluster Suite Solves Important HA Problems


•  Minimizes downtime

•  Automatic failover

•  Transparent to application

•  Active/passive clustering

•  Redundancy −  Data −  Network −  Server & Power

However, the Red Hat HA Add-on is not −  A replication solution −  A multimaster solution

Red Hat HA Add-on with Postgres


Implementation Basics


•  Needs team work −  DBA, Network, Sysadmin teams

•  No need to use Global File System (GFS)

•  Manual editing of cluster.conf −  Avoid, or sync them all the time

•  No auto-starting of Postgres

•  Postgres' init script compatibility

Implementation Basics – Part 1


•  Quorum disk

•  Firewall considerations

•  Benefiting from clusterssh on Linux

•  Yum groupinstall “High Availability”

•  Yum groupinstall “High Availability Management”

Implementation Basics – Part 2


•  The “High Availability Management” group −  luci, ricci

•  One web interface for managing cluster and storage

•  Automated deployment of HA packages

•  Easy integration with existing cluster

•  Managing multiple clusters with a single interface

•  Integration of cluster status and logs

Using Conga


•  Everything is handled by the add-on

•  Detection of failed node −  Split brain scenarios

•  Failing back −  Disabling it to avoid extra downtime

•  Total downtime: 30-60 seconds

Failover


Implementation basics

Active PostgreSQL Server

Passive PostgreSQL Server

Private Network

Shared Storage



Sharded nodes, each backing the others up

Shared Storage

Private Network Switch

Node1 Node2 Node3 Node4



Data files and archived xlogs of db1 and db2

(/pg01, /pg02, /pga01, /pga02)

Data files and resync'd xlogs of db1-RO and db2-RO

(/pg03, /pg04, /pga03, /pga04)

Passive: DB1

Active: DB2 Active: DB1 Passive: DB2

Streaming replication

Streaming replication

Shared Storage

Shared Storage Active HS: DB1

Passive HS: DB2

Passive HS: DB1

Active HS: DB2


Choosing the Right Hardware


•  This is probably the most important part

•  You must consult the Red Hat Hardware Compatibility Guide

https://access.redhat.com/kb/docs/DOC-30004

•  You have to consider firmware

•  You must have a fencing device −  What is fencing? −  Importance of fencing −  Well-known fencing devices

− HP ILO − DELL DRAC −  IBM BladeCenter − Cisco UCS − VMware



•  Multicast support

•  Internal network setup

•  Enable ICMP echo echo "net.ipv4.icmp_echo_ignore_broadcasts = 0" \

>> /etc/sysctl.conf

•  Fiber Channel Switch for storage

•  SAN −  RAID arrays −  What about NFS? DAS? NAS?

•  At least 2 NICs −  Why is 4 preferred?



Postgres Installation tips


•  Postgres version

•  Changing Postgres parameters: −  listen_addresses −  unix_domain_socket −  external_pid_file

•  What about using the passive server as a replica?

Postgres Installation Tips


•  High Availability is important for most enterprise databases

•  Red Hat Cluster Suite solves important HA problems

•  Best practices for RHCS implementation −  Assemble the right team −  Choose appropriate hardware

− Fencing is a critical consideration −  Configure your network −  Configure Postgres for your RHCS infrastructure

•  Walk through each step carefully to save time and aggravation

•  Get Help! EDB can help you implement an enterprise-grade RHCS solution

Summary


Q&A For further information, contact [email protected]

Postgres & Red Hat Cluster Suite

Technology

Transcript of Postgres & Red Hat Cluster Suite