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Creating a ZEO server

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PyAMS primarily relies on a ZODB database to store it’s configuration. Other packages may rely on another -database, but PyAMS_content package also stores it’s contents in a ZODB.

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As some PyAMS packages start concurrent processes (“synchronization” is done via ØMQ), concurrent accesses are -required on the ZODB (even when you start your application in “single process” mode) and a ZEO server have to be -started.

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Creating initial buildout

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PyAMS provides a ZEO server scaffold, called zeo_server, generated via a cookiecutter template.

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A simple option to create a ZEO server is to create a buildout environment including ZEO and ZODB packages:

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# mkdir /var/local/
-# pip3 install virtualenv
-# virtualenv --python=python3.5 env
-# cd env
-# . bin/activate
-(env) # pip3.5 install cookiecutter
-(env) # cookiecutter hg+http://hg.ztfy.org/pyams/scaffolds/zeo_server
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CookieCutter will ask you for a small set of input variables that you can change or not:

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  • pyams_release: version of PyAMS configuration file to use. “latest” (default value) will point to last release; -you can also choose to point to a given release (“0.1.4” for example)
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  • project_name: current environment name in “human form”
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  • project_slug: “technical” package name, based on project name
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  • eggs_directory: relative or absolute path to directory containing downloaded eggs; this directory can be -shared with other projects (“eggs” as default)
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  • run_user: user name under which ZEO process will run (“zeoadm” as default)
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  • run_group: group name under which ZEO process will run (“zeo” as default)
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  • zeo_server_port: listening port of ZEO server (“8100” as default)
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  • zeo_monitor_port: listening port of ZEO monitor (“8101” as default)
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  • zeo_storage: name of first ZEO storage; default value is based on project name
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  • use_zeo_auth: specify if ZEO authentication should be used
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  • zeo_auth_user: name of ZEO authenticated user (if ZEO authentication is used)
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  • zeo_auth_password: password of ZEO authenticated user (if ZEO authentication is used)
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  • zeo_pack_report: email address to which pack reports should be sent
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  • logs_directory: absolute path to directory containing ZEO’s log files.
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A message is displayed after initialization to finalize environment creation:

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ZEO server configuration

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All ZEO configuration files are generated in “etc” subdirectory. These includes:

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  • etc/zeo_server-zdaemon.conf: ZDaemon configuration file
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  • etc/zeo_server-zeo.conf: ZEO server configuration file
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  • etc/auth.db: ZEO authentication file; WARNING: this file is not created automatically, you have to create it -after buildout.
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In these file names, always replace “zeo_server” with the value which was given to “project_slug” variable during -CookieCutter template creation.

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ZEO server tools

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A set of system configuration files are produced to handle your ZEO environment. These includes:

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  • etc/init.d/zeo-zeo_server: ZEO server start/stop script in Init-D format. Create a link to this file in -/etc/init.d and update Init.d scripts (update-rc.d zeo-zeo_server defaults) to include ZEO in server start/stop

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    process. You can also use this script to start/stop ZEO by hand with start and stop arguments.

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  • etc/systemd/zeo-zeo_server.service: SystemD service configuration file for ZEO server. Create a link to this -file in /etc/systemd/system and reload SystemD daemon (systemctl daemon-reload) before activating ZEO service -(systemctl enable zeo-zeo_server.service and systemctl start zeo-zeo_server.service).

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  • etc/logrotate.d/zeo-zeo_server: LogRotate configuration file for ZEO log files. Create a link to this file in -/etc/logrotate.d to activate log rotation for ZEO server.

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  • etc/cron.d/pack-zeo-zeo_server: Cron configuration file for ZEO database packing. Just create a link to this -file in /etc/cron.d directory to enable ZODB packing on a weekly basis (by default).

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In these file names, always replace “zeo_server” with the value which was given to “project_slug” variable during -CookieCutter template creation. All directory names are those used on a Debian GNU/Linux distribution and may have -to be changed on other distributions.

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