Introducing EDB Failover Manager

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This presentation will provide you with the details on this rock-solid product -- what is it, how to use it, and the benefits of this lightweight, non single-point-of-failure product. During this presentation Mark Jones, Principal Sales Engineer reviews: • What is EDB Failover Manager • How to minimize downtime • Key features such as: Cluster health monitoring, node/database failure detection, automatic failover mechanisms and user customizable options. This presentation is intended for organizations seeking a solution for High Availability with their Postgres database.

Technologie

Introducing:
EDB Failover Manager
Mark Jones
Principal Engineer

© 2013 EDB All rights reserved 8.1.

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Agenda
•  What is Failover Manager
•  Failover Manager Components
•  Failover Manager Features
•  Failover Manager Scenarios
•  Failure Detection Scenarios
•  EDB Failover Manager Summary
© 2013 EDB All rights reserved 8.1.

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What is Failover Manager?
•  A solution to aid in the creation of highly available
configurations of Postgres
•  Monitors the health of a Postgres HA configuration
•  Automates the failover process in the event of a failure
•  Used in conjunction with Streaming Replication

© 2013 EDB All rights reserved 8.1.

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EDB
FAILOVER

Clients

Master

MANAGER

Network /
Internet

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

The MASTER is down!

Streaming
Replica

© 2013 EDB All rights reserved 8.1.

I agree! Take control now!

4

Witness

Failover Manager components
•  Agents
−  These agents run on the master and standby nodes
−  Monitors the health of those databases
−  Communicates with each other and witness to determine cluster
health
−  Notifies user if an issue is detected
−  Initiates failover if needed

•  Witness node
−  An agent whose job is to confirm assertions of either master or
standby
−  Breaks tie in the event of conflicting assertions

© 2013 EDB All rights reserved 8.1.

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Failover Manager Features
•  Automatic Failover from master to replica node
•  Configurable fencing operation
−  By default uses VIP
−  Parameter to specify alternative operation
−  Ex: reconfigure a load balancer

•  Manual failover configuration possible
•  Email notifications when cluster status changes
•  Witness node provides protection against ‘split brain’ scenarios
•  User configurable wait times
•  Built on PPCD/Jgroups technology
−  Proven functionality

© 2013 EDB All rights reserved 8.1.

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Failover Scenarios
•  Failover occurs in the following situations:
−  The master database crashes or is shutdown
−  The node the master db is on is unreachable, crashes or is shutdown.

•  If either of the above situations occurs, the standby attempts to
verify it by communicating with the witness
•  If no confirmation can be made, no failover action is taken.

© 2013 EDB All rights reserved 8.1.

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Failover Scenario #1 Master DB down

1.  Reconfigure master so it can’t be
started as master (create
recovery.conf)

6. Reconfigure VIP/Run Fencing
operation
7.  Promotes Standby

2.  Master agent exits, standby notified

8. Standby and witness exit

3.  Witness/standby confirm master db
down.
4.  Checks VIP and WKA
© 2013 EDB All rights reserved 8.1.

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Failover Scenario #2 Master Server down

1.  The standby agent is notified and
tries to connect directly to master db
2.  Witness confirms and release the
VIP/run fencing operation
3.  Promote the Standby
4.  ppfm agent exits
© 2013 EDB All rights reserved 8.1.

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Failure Detection Scenarios
•  Master agent dies
−  Verify master db still alive, notify adminstrator
−  All agents exit and must be restarted by admin

•  Standby agent dies
−  Notify administrator
−  All agents exit and must be restarted by admin

•  Standby DB unavailable
− 
− 
− 
− 

Master, witness verify db is down, notify administrator
No failure protection
All agents exit and must be restarted by admin
Standby db must be restarted by admin

•  Witness agent dies
−  Administrator is notified
−  Other agents exit
−  Admin needs to restart all agents
© 2013 EDB All rights reserved 8.1.

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EDB Failover Manager Summary
•  Automated failover solution for Highly Available Postgres
configurations
•  Customizable to meet varying customer needs
•  Built on proven/tested technology
•  Available now. Download and try today:
http://www.enterprisedb.com/download-failover-manager

© 2013 EDB All rights reserved 8.1.

11

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Introducing EDB Failover Manager

2. Agenda •  What is Failover Manager •  Failover Manager Components •  Failover Manager Features •  Failover Manager Scenarios •  Failure Detection Scenarios •  EDB Failover Manager Summary © 2013 EDB All rights reserved 8.1. 2

3. What is Failover Manager? •  A solution to aid in the creation of highly available configurations of Postgres •  Monitors the health of a Postgres HA configuration •  Automates the failover process in the event of a failure •  Used in conjunction with Streaming Replication © 2013 EDB All rights reserved 8.1. 3

4. EDB FAILOVER Clients Master MANAGER Network / Internet Failover Manager creates fault tolerant database clusters to minimize downtime when a master database fails by keeping data online in high availability configurations The MASTER is down! Streaming Replica © 2013 EDB All rights reserved 8.1. I agree! Take control now! 4 Witness

5. Failover Manager components •  Agents −  These agents run on the master and standby nodes −  Monitors the health of those databases −  Communicates with each other and witness to determine cluster health −  Notifies user if an issue is detected −  Initiates failover if needed •  Witness node −  An agent whose job is to confirm assertions of either master or standby −  Breaks tie in the event of conflicting assertions © 2013 EDB All rights reserved 8.1. 5

6. Failover Manager Features •  Automatic Failover from master to replica node •  Configurable fencing operation −  By default uses VIP −  Parameter to specify alternative operation −  Ex: reconfigure a load balancer •  Manual failover configuration possible •  Email notifications when cluster status changes •  Witness node provides protection against ‘split brain’ scenarios •  User configurable wait times •  Built on PPCD/Jgroups technology −  Proven functionality © 2013 EDB All rights reserved 8.1. 6

7. Failover Scenarios •  Failover occurs in the following situations: −  The master database crashes or is shutdown −  The node the master db is on is unreachable, crashes or is shutdown. •  If either of the above situations occurs, the standby attempts to verify it by communicating with the witness •  If no confirmation can be made, no failover action is taken. © 2013 EDB All rights reserved 8.1. 7

8. Failover Scenario #1 Master DB down 1.  Reconfigure master so it can’t be started as master (create recovery.conf) 6. Reconfigure VIP/Run Fencing operation 7.  Promotes Standby 2.  Master agent exits, standby notified 8. Standby and witness exit 3.  Witness/standby confirm master db down. 4.  Checks VIP and WKA © 2013 EDB All rights reserved 8.1. 8

9. Failover Scenario #2 Master Server down 1.  The standby agent is notified and tries to connect directly to master db 2.  Witness confirms and release the VIP/run fencing operation 3.  Promote the Standby 4.  ppfm agent exits © 2013 EDB All rights reserved 8.1. 9

10. Failure Detection Scenarios •  Master agent dies −  Verify master db still alive, notify adminstrator −  All agents exit and must be restarted by admin •  Standby agent dies −  Notify administrator −  All agents exit and must be restarted by admin •  Standby DB unavailable −  −  −  −  Master, witness verify db is down, notify administrator No failure protection All agents exit and must be restarted by admin Standby db must be restarted by admin •  Witness agent dies −  Administrator is notified −  Other agents exit −  Admin needs to restart all agents © 2013 EDB All rights reserved 8.1. 10

11. EDB Failover Manager Summary •  Automated failover solution for Highly Available Postgres configurations •  Customizable to meet varying customer needs •  Built on proven/tested technology •  Available now. Download and try today: http://www.enterprisedb.com/download-failover-manager © 2013 EDB All rights reserved 8.1. 11

Introducing EDB Failover Manager

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