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A simple recipe to create a zope cluster

Project description

collective.recipe.zope2cluster

This recipe aims to make it easier to set up a cluster of zope clients. The zope2cluster recipe allows us to point to an existing plone.recipe.zope2instance part and copy it’s options. Any options we define in the zope2cluster part override the original instance’s options.

Example:

[instance]
recipe = plone.recipe.zope2instance
user = admin:admin
http-address = 8080

[instance2]
recipe = collective.recipe.zope2cluster
instance-clone = instance
http-address = 8081

Our instance2 part ends up being an exact copy of instance but changes the http-address to 8081.

Detailed Documentation

Supported options

The recipe supports the following options:

instance-clone

The name of the part that you want to ‘clone’. Typically instance.

Example usage

We’ll start by creating a buildout that uses the recipe:

>>> write('buildout.cfg',
... """
... [buildout]
... parts = instance instance2
... index = http://pypi.python.org/simple
...
... [instance]
... recipe = plone.recipe.zope2instance
... zope2-location = %(zope2_location)s
... user = admin:admin
... ip-address = 192.168.0.1
... http-address = 8080
... effective-user = zope
... event-log-level = CRITICAL
...
... [instance2]
... recipe = collective.recipe.zope2cluster
... instance-clone = instance
... ip-address = 192.168.0.2
... http-address = 8081
... event-log-level = WARN
... """ % globals())

Running the buildout gives us:

>>> print 'start', system(buildout)
start...
Installing instance2.
...

First let’s check to see that the original instance has the correct options:

>>> instance = os.path.join(sample_buildout, 'parts', 'instance')
>>> zc = open(os.path.join(instance, 'etc', 'zope.conf')).read()
>>> print zc
instancehome /sample-buildout/parts/instance
...
effective-user zope
ip-address 192.168.0.1
...
<eventlog>
  level CRITICAL
...
</eventlog>
...
<http-server>
...
  address 8080
...
</http-server>
...

Now let’s check our instance2 part to see if it is setup correctly:

>>> instance = os.path.join(sample_buildout, 'parts', 'instance2')
>>> zc = open(os.path.join(instance, 'etc', 'zope.conf')).read()
>>> print zc
instancehome /sample-buildout/parts/instance2
...
effective-user zope
ip-address 192.168.0.2
...
<eventlog>
  level WARN
...
</eventlog>
...
<http-server>
...
  address 8081
...
</http-server>
...

Contributors

Clayton Parker [claytron], Author

Change history

1.0 (2008-07-28)

  • Implemented instance cloning code [claytron]

  • Implemented tests [claytron]

  • Created recipe with ZopeSkel [claytron]

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