This is a pre-production deployment of Warehouse, however changes made here WILL affect the production instance of PyPI.
Latest Version Dependencies status unknown Test status unknown Test coverage unknown
Project Description

Generic clustering package for EC2, suitable for redis/postgresql etc.

This package makes it easier to deploy clustered applications such as PostgreSQL and Redis on EC2 by handling generic logic, including:

* Deciding which role the instance should assume
* Creating and updating DNS records
* Preparing the instance for its role (e.g. writing a recovery.conf file for postgres)

Basic Usage:

The default ec2cluster classes assume your EC2 instances have JSON-encoded user data containing some specific attributes. The following attributes are required:

* cluster - the name of the cluster, e.g. maindb

Install ec2cluster with pip:

pip install ec2cluster

Create a configuration file:

MASTER_CNAME = 'master.%(cluster)s.example.com'
SLAVE_CNAME = 'slave.%(cluster)s.example.com'
INIT_MASTER_SCRIPT = '/path/to/some_script.py'
INIT_SLAVE_SCRIPT = '/path/to/another_script.py'

Run ec2cluster, specifying the path to the config file:

ec2cluster init # initialise the cluster service
ec2cluster promote # promote a slave to the master role

PostgreSQL cluster:

When starting a postgres read-slave, a file named recovery.conf must be written to the postgres configuration directory. A template file is used to make it easy to customise your recovery options.

Config file:

MASTER_CNAME = 'master.%(cluster)s.example.com'
SLAVE_CNAME = 'slave.%(cluster)s.example.com'
RECOVERY_TEMPLATE = '/path/to/template.conf'
RECOVERY_FILENAME = '/var/lib/postgresql/9.1/main/recovery.conf'

In the recovery template file, specify the options required for your read-slaves. Instance metadata and userdata can be used for string replacement. For example:

standby_mode = on
recovery_target_timeline = latest
pause_at_recovery_target = false
restore_command = '/usr/bin/s3cmd --config=/var/lib/postgresql/.s3cfg get s3://%(cluster)s/archive/wal/%%f %%p'
primary_conninfo = 'host=%(master_cname) port=5432 user=postgres password=secret sslmode=disable

Note the use of “%%f” - because we are using string formatting we need to escape the percentage sign in order to end up with “%f” as required by postgres.

Release History

Release History

0.28

This version

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0.27

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0.26

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0.25

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0.24

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0.23

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0.22

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0.21

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0.20

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0.19

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0.18

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0.17

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0.16

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0.15

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0.14

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0.13

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0.12

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0.11

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0.10

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0.9

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0.8

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0.7

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0.6

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0.5

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0.4

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0.3

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0.1

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Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
ec2cluster-0.28.tar.gz (8.5 kB) Copy SHA256 Checksum SHA256 Source Apr 17, 2013

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