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PostgreSQL Replication, Second Edition

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PostgreSQL Replication, Second Edition

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PostgreSQL Replication, Second Edition
Jul, 2015 | 322 pages
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Table of Contents (22 chapters)
PostgreSQL Replication Second Edition
PostgreSQL Replication Second Edition
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Understanding the Concepts of Replication
Understanding the Concepts of Replication
The CAP theorem and physical limitations of replication
Different types of replication
Using sharding and data distribution
Summary
2
Understanding the PostgreSQL Transaction Log
Understanding the PostgreSQL Transaction Log
How PostgreSQL writes data
The XLOG and replication
Understanding consistency and data loss
Tuning checkpoints and the XLOG
Experiencing the XLOG in action
Making use of replication slots
Summary
3
Understanding Point-in-time Recovery
Understanding Point-in-time Recovery
Understanding the purpose of PITR
Archiving the transaction log
Taking base backups
Replaying the transaction log
Summary
4
Setting Up Asynchronous Replication
Setting Up Asynchronous Replication
Setting up streaming replication
Configuring a cascaded replication
Turning slaves into masters
Mixing streaming-based and file-based recovery
Making streaming-only replication more robust
Efficient cleanup and the end of recovery
Conflict management
Dealing with timelines
Delayed replicas
Summary
5
Setting Up Synchronous Replication
Setting Up Synchronous Replication
Synchronous replication setup
Understanding the practical implications and performance
Redundancy and stopping replication
Summary
6
Monitoring Your Setup
Monitoring Your Setup
Checking your archive
Checking pg_stat_replication
Checking for operating system processes
Checking for replication slots
Dealing with monitoring tools
Summary
7
Understanding Linux High Availability
Understanding Linux High Availability
Understanding the purpose of High Availability
Measuring availability
Durability and availability
Detecting failures
The split-brain syndrome
Understanding Linux-HA
Setting up a simple HA cluster
Common maintenance tasks
Summary
8
Working with PgBouncer
Working with PgBouncer
Understanding the fundamental PgBouncer concepts
Installing PgBouncer
Configuring your first PgBouncer setup
Improving performance
Maintaining PgBouncer
Summary
9
Working with pgpool
Working with pgpool
Installing pgpool
Understanding the features of pgpool
Understanding the pgpool architecture
Setting up replication and load balancing
Checking the replication
Running pgpool with streaming replication
Dealing with failovers and High Availability
Summary
10
Configuring Slony
Configuring Slony
Installing Slony
Understanding how Slony works
Replicating your first database
Deploying DDLs
Adding tables to replication and managing problems
Performing failovers
Summary
11
Using SkyTools
Using SkyTools
Installing SkyTools
Dissecting SkyTools
Managing pgq queues
Using Londiste to replicate data
A word about walmgr
Summary
12
Working with Postgres-XC
Working with Postgres-XC
Understanding the Postgres-XC architecture
Installing Postgres-XC
Configuring a simple cluster
Optimizing for performance
Creating tables and issuing queries
Adding nodes
Handling failovers and dropping nodes
Summary
13
Scaling with PL/Proxy
Scaling with PL/Proxy
Understanding the basic concepts
Setting up PL/Proxy
Extending and handling clusters in a clever way
Summary
14
Scaling with BDR
Scaling with BDR
Understanding BDR replication concepts
Installing BDR
Setting up a simple cluster
Understanding sets
Controlling replication
Summary
15
Working with Walbouncer
Working with Walbouncer
The concepts of walbouncer
Installing walbouncer
Using additional configuration options
Adjusting filtering rules
Summary
Index
Index

Dealing with monitoring tools

There are a couple of monitoring tools around these days that make your life easier.

One of the most popular monitoring tools around is Nagios. It is widely used and supports a variety of software components.

If you want to use Nagios to monitor your PostgreSQL cluster, it is necessary to install a plugin capable of running tests relevant to replication. Such plugins are also available for PostgreSQL, and can be downloaded for free from http://bucardo.org/wiki/Check_postgres. The Bucardo plugins for Nagios are not just able to test replication but are also a standard software component for monitoring PostgreSQL as a whole.

Installing check_postgres

Once you have downloaded the plugin from the Bucardo website, it is easy to install it, as follows:

  1. The first step is to extract the .tar archive:

    tar xvfz check_postgres.tar.gz

  2. Now you can enter the newly created directory and run Perl Makefile:

    perl Makefile.PL

  3. Finally, you can compile and install the code:

    make
make install...
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