Collective Warmup
Project description
Introduction
collective.warmup has been created to warm up web application’s caches upon start and restart.
It works by reading a configuration file containing a list of urls that are then invoked.
collective.warmup is inspired by Gil Forcada’s warmup_plone.py script.
Why not a simple bash script?
While the basic use case is very simple, collective.warmup offers the following extra features:
Verifies the correctness of the response body (e.g. contains a certain string)
Can operate in crawl mode, following links in pages to warm up all related pages
Can filter out certain urls according to a general definition
Installation
collective.warmup can be installed in two ways:
Dependencies
Manual installation
To install it (using virtualenv, on a GNU/Debian machine):
$ sudo apt-get install build-essential python-dev python-lxml python-virtualenv libxml2-dev libxslt1-dev $ virtualenv warmup && cd warmup && souce bin/activate (warmup) $ pip install collective.warmup
and launch it with:
(warmup) $ bin/warmup <path/file.ini>
Alternative installation with buildout
To integrate collective.warmup in a buildout with Plone, add this to your configuration:
[buildout]
...
parts =
...
warmup
[instance]
...
eggs +=
collective.warmup
[instance]
environment-vars +=
WARMUP_BIN ${buildout:directory}/bin/warmup
WARMUP_INI ${buildout:directory}/warmup.ini
WARMUP_HEALTH_THRESHOLD 50000
[warmup]
recipe = zc.recipe.egg:scripts
eggs = collective.warmup
After executing the buildout you will find the warmup script in the bin directory.
In this example, the script will be executed automatically by the Zope instance each time it is started.
Configuration file
This is a sample warmup.ini configuration:
[warmup]
enabled = True
sleep = 2
base_url = http://localhost
logfile = /path/to/warmup.log
urls =
Home page
[config]
max_attempts = 2
base_path = mysite
[Home page]
path = ${config:base_path}/
max_attempts = ${config:max_attempts}
check_exists =
Welcome
check_not_exists =
p0wned by
follow_links = True
ignore_middle =
@@
++theme++
#
?
ignore_end =
.css
.js
.png
.jpg
.jpeg
.gif
.xml
RSS
.ico
Options
Global [warmup]
- enableTrue or False
If False, the script will do nothing when invoked.
- sleepinteger
The number of seconds the script waits between url retrievals. Defaults to 2.
- base_urla valid URL (don’t forget the protocol!)
The base URL to check (all paths in the various URL sections are relative to this URL).
- log_filea filesystem path
The file where the logs will be written.
- urlsa list of sections (separated by newline)
The URLs that we want to check. Each URL must have its own section in the configuration file (see below) and we reference these sections here (do not put real URLs here!). It also set an order for the checks (which are executed sequentially).
URL section
- max_attemptsinteger
The maximum number of attempts to check the url. Defaults to 2
- paththe path to check
The path will be added to the base_url parameter in order to retrieve the page url
- check_existslist of strings
A list of strings that must be present in the page
- check_not_existslist of strings
A list of strings that must not be present in the page
- follow_linksTrue or False
If True the script will follow the links in the page and will perform the same checks for each link.
- ignore_middlelist of strings
If follow_links is True, the links containing one of these strings will be ignored
- ignore_endlist of strings
If follow_links is True, the links ending with one of these strings will be ignored
Health check
In order not to mark backend healthy too early by the load-balancer, before proper warmup, this package defines a browser view called @@health.check which can be used within your load-balancer probe mechanism. See bellow a Varnish configuration example:
backend instance_1 {
.host = "localhost";
.port = "8081";
.probe = {
.url = "/health.check";
.interval = 5s;
.timeout = 1s;
.window = 5;
.threshold = 3;
}
}
This way Varnish will mark the Zope instance backend healthy when ZODB cache-size is bigger than WARMUP_HEALTH_THRESHOLD. If you do not define the WARMUP_HEALTH_THRESHOLD environment variable, the Zope instance backend will be marked healthy as soon as Zope will be able to handle requests.
Credits
Changelog
1.2 (2016-09-08)
Check for write permissions within logfile and fallback to a temporary file if can’t write instead of sys.exit [avoinea]
Add @@health.check browser view to be used with load-balancer health-check in order not to mark backend healthy too early before proper warmup. [avoinea]
Avoid zombie processes. [jone]
Add zcml:condition for Plone 3 compatibility [gborelli]
1.1 (2014-07-18)
Python 2.4 support [gborelli]
1.0 (2014-04-06)
First release
Release history Release notifications | RSS feed
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