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ZC Buildout recipes for ZODB

Project description

Recipes for working with ZODB.

Changes

0.2 (2007-04-17)

Added handling of %import directives.

0.1 (2007-04-13)

Initial release.

Detailed Documentation

Defining ZEO Storage Servers

The zc.zodbrecipes:server recipe can be used to define ZEO storage servers. To define a storage server, you define a part for the server and specify configuration data.

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = server
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
... ''')

Here we specified a minimal configuration using a “foo” storage. We can use aby kind of storage we want. Here we ised an import statement to import the schema definition that defined the foo section. Any imports are simply copied to the generated configuration file. When we run the buildout:

>>> print system(buildout),
buildout: Installing server
zc.zodbrecipes:
A runzeo script couldn't be found at:
<BLANKLINE>
  '/sample-buildout/bin/runzeo'
<BLANKLINE>
You may need to generate a runzeo script using the
zc.recipe.eggs:script recipe and the ZODB3 egg, or you may need
to specify the location of a script using the runzeo option.
<BLANKLINE>

We got a warning because the recipe expects there to be a runzeo script and we haven’t created one. This is done using the zc.recipe.egg:script recipe:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = zodb server
...
... [zodb]
... recipe = zc.recipe.egg:script
... eggs = ZODB3
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
... ''')
>>> print system(buildout),
buildout: Installing zodb
buildout: Updating server

We get 2 things. We get a directory in parts containing ZEO and zdaemon configuration files:

>>> ls('parts', 'server')
-  zdaemon.conf
-  zeo.conf

Let’s look at the configuration files:

>>> cat('parts', 'server', 'zeo.conf')
%import foo
<BLANKLINE>
<zeo>
  address 8100
  monitor-address 8101
  transaction-timeout 300
</zeo>
<BLANKLINE>
<foo main>
  path /databases/Data.fs
</foo>
<BLANKLINE>
<eventlog>
  <logfile>
    path STDOUT
  </logfile>
<BLANKLINE>
</eventlog>

We see the same data we input with the addition of an eventlog section that directs logging to standard out. In production, we’ll use zdaemon’s transacript log to capture this logging output in a file. If we wish, we can specify a log file ourselves:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = zodb server
...
... [zodb]
... recipe = zc.recipe.egg:script
... eggs = ZODB3
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
...    <eventlog>
...      <logfile>
...        path /var/log/zeo.log
...      </logfile>
...    </eventlog>
... ''')
>>> print system(buildout),
buildout: Uninstalling server
buildout: Updating zodb
buildout: Installing server
>>> cat('parts', 'server', 'zeo.conf')
%import foo
<BLANKLINE>
<zeo>
  address 8100
  monitor-address 8101
  transaction-timeout 300
</zeo>
<BLANKLINE>
<foo main>
  path /databases/Data.fs
</foo>
<BLANKLINE>
<eventlog>
  <logfile>
    path /var/log/zeo.log
  </logfile>
<BLANKLINE>
</eventlog>

But we’ll stick with the default:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = zodb server
...
... [zodb]
... recipe = zc.recipe.egg:script
... eggs = ZODB3
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
... ''')
>>> print system(buildout),
buildout: Uninstalling server
buildout: Updating zodb
buildout: Installing server

Let’s look at the zdaemon log file:

>>> cat('parts', 'server', 'zdaemon.conf')
<runner>
  daemon on
  directory /sample-buildout/parts/server
  program /sample-buildout/bin/runzeo -C /sample-buildout/parts/server/zeo.conf
  socket-name /sample-buildout/parts/server/zdaemon.sock
  transcript /sample-buildout/parts/server/zeo.log
</runner>
<BLANKLINE>
<eventlog>
  <logfile>
    path /sample-buildout/parts/server/zeo.log
  </logfile>
<BLANKLINE>
</eventlog>

We run the runzeo script with the zeo.conf file. Log and run-time files are places in the server part directory. We use a transcript log to provide the ZEO server log. I like to use the transacriot log because it captures program output, such as start-up exceptions that aren’t captured in a program’s logs.

And we get a control script generated in our bin directory:

>>> cat('bin', 'server')
#!/usr/local/bin/python2.4
<BLANKLINE>
import sys
sys.path[0:0] = [
  '/sample-buildout/eggs/zdaemon-2.0-py2.4.egg',
  '/sample-buildout/eggs/setuptools-0.6-py2.4.egg',
  '/sample-buildout/eggs/ZConfig-2.4-py2.4.egg',
  ]
<BLANKLINE>
import zdaemon.zdctl
<BLANKLINE>
if __name__ == '__main__':
    zdaemon.zdctl.main([
        '-C', '/sample-buildout/parts/server/zdaemon.conf',
        ]+sys.argv[1:]
        )

This is a zdaemon script. We can use this to control the ZEO server process.

Unix Deployment support

The server recipe works with the zc.recipe.deployment. In particular, if a deployment option is specified, it names a part or section that defines the following uptions:

crontab-directory

A directory for crontab files.

etc-directory

A directory for configuration files.

log-directory

A directory for log files.

logrotate-directory

A directory for logrotate configuration files.

rc-directory

A directory for run-control scripts.

run-directory

A directory for run-time files.

user

The user the server process should run as

Let’s create some directories and add a deployment section to our buildout:

>>> for d in 'cron', 'etc', 'log', 'rotate', 'rc', 'run':
...     mkdir(d)
...     globals()[d] = join(sample_buildout, d)
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = zodb server
...
... [zodb]
... recipe = zc.recipe.egg:script
... eggs = ZODB3
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %%import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
... deployment = demo
...
... [demo]
... crontab-directory = %(cron)s
... etc-directory = %(etc)s
... log-directory = %(log)s
... logrotate-directory = %(rotate)s
... rc-directory = %(rc)s
... run-directory = %(run)s
... user = bob
... ''' % globals())
>>> print system(buildout),
buildout: Uninstalling server
buildout: Updating zodb
buildout: Installing server

Now, the parts directory and the control script will be gone:

>>> import os
>>> os.path.exists(join('parts', 'server'))
False
>>> os.path.exists(join('bin', 'server'))
False

Instead, the control script will be in the rc directory:

>>> ls('rc')
-  demo-server

The run-control script name now combines the deployment name and the script name.

and the configuration files will be in the etc directory:

>>> ls('etc')
-  server-zdaemon.conf
-  server-zeo.conf

In additional we’ll get a logrotate configuration file:

>>> cat('rotate', 'demo-server')
/sample-buildout/log/server-zeo.log {
  rotate 5
  weekly
  postrotate
    demo-server reopen_transcript
  endscript
}

This will rotate the zeo log file once a week.

If we look at the zdaemon configuration file, we can see that it reflects the deployment locations:

>>> cat('etc', 'server-zdaemon.conf')
<runner>
  daemon on
  directory /sample-buildout/run
  program /sample-buildout/bin/runzeo -C /sample-buildout/etc/server-zeo.conf
  socket-name /sample-buildout/run/server-zdaemon.sock
  transcript /sample-buildout/log/server-zeo.log
  user bob
</runner>
<BLANKLINE>
<eventlog>
  <logfile>
    path /sample-buildout/log/server-zeo.log
  </logfile>
<BLANKLINE>
</eventlog>

Note that different file names are used. Since a deployment may be (and usually is) shared by multiple parts, files are prefixed with their part names. Also note that the deployment user is set in the zdaemon configuration.

We can request definition of a cron job to pack the databases by specifying a pack option. This option takes 5 or 6 values. The first 5 values are the time and date fields defined by Unix crontab files. The last field is the number of days in the past to pack to and defaults to 1.

Let’s add a pack option:

>>> write('buildout.cfg',
... '''
... [buildout]
... parts = zodb server
...
... [zodb]
... recipe = zc.recipe.egg:script
... eggs = ZODB3
...
... [server]
... recipe = zc.zodbrecipes:server
... zeo.conf =
...    <zeo>
...       address 8100
...       monitor-address 8101
...       transaction-timeout 300
...    </zeo>
...    %%import foo
...    <foo main>
...       path /databases/Data.fs
...    </foo>
... deployment = demo
... pack = 1 1 * * 0 3
...
... [demo]
... crontab-directory = %(cron)s
... etc-directory = %(etc)s
... log-directory = %(log)s
... logrotate-directory = %(rotate)s
... rc-directory = %(rc)s
... run-directory = %(run)s
... user = bob
... ''' % globals())
>>> print system(buildout+' -D'),
buildout: Uninstalling server
buildout: Updating zodb
buildout: Installing server

Now, we’ll get a crontab file:

>>> cat(cron, 'pack-demo-server')
1 1 * * 0 /sample-buildout/bin/zeopack -p 8100 -S main -d 3

In this example, we’ll pack the databases every Sunday at 1:01 to 3 days.

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