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Page: About
Name hcron - Periodic Command Scheduler Requirements Python 2.6 License GPL-2 Links Repository https://bitbucket.org/hcron/hcron
Page: Announcement - hcron v0.21 Released
Summary hcron-reload gains an new option: --unload. Most changes involve improvements to the log entries. There is one fix for a bug that almost never showed up, but then started to quite regularly. Thanks for the report and work in nailing it down. Highl
Page: Announcements

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Page: Converting between cron and hcron
The hcron-conv program converts, in both directions, between crontab and hcron. See the hcron-conv man page for more. From cron to hcron for each command and the preceding comments of the command of a crontab file are written to individual event files sta

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Page: Documentation
Page: Downloads
Documents hcron_article-20101019.pdf (SHA1: de024f48cc0a5de494ad8495b0213e44cf1e2224) Code See bitbucket.org: https://bitbucket.org/hcron/hcron/downloads https://bitbucket.org/hcron/hcron/downloads Other hcron-vim.tgz (SHA1: 9a072fcb52b6e28b5e152d51533da7

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Page: Effectively Using Failover Events
Introduction When an event fails to be launched, hcron can trigger an event if it is listed in the failover_event field. Failover events are typically not intended to be run in general, although they can. In the examples below, we will see how such events

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Page: Getting Your Environment Right
When hcron executes an event, it does so with a minimal environment. This means each event must set up the environment as appropriate for itself. The brute force way is to run a shell as a login shell, which will provide an environment almost equivalent t

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Page: hcron Guide
hcron Guide - v0.21 - 20180810
Page: hcron Guide - Releases
Page: hcron Guide - v0.20 - 20170620
For hcron v0.20. Introduction cron, the ubiquitous periodic scheduler, is one of the workhorses in the UNIX toolbox. There is no need to produce yet another cron ... unless it brings something new to the table. hcron does just that in a number of really u
Page: hcron Guide - v0.21 - 20180422
For hcron v0.21. See here for all releases. Introduction cron, the ubiquitous periodic scheduler, is one of the workhorses in the UNIX toolbox. There is no need to produce yet another cron ... unless it brings something new to the table. hcron does just t
Page: hcron Guide - v0.21 - 20180810
For hcron v0.21. See here for all releases. Introduction cron, the ubiquitous periodic scheduler, is one of the workhorses in the UNIX toolbox. There is no need to produce yet another cron ... unless it brings something new to the table. hcron does just t
Home page: Home
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Page: Index

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Page: Main
What is hcron? hcron is a periodic command scheduler along the lines of the ubiquitous cron–but with some really useful differences. hcron scales easily from a handful of events to many thousands: At Environment Canada, hcron is in 24/7 operational use wi
Page: Multihost Event Using Indexing and Iteration
Introduction There are a number of ways to launch an event across multiple hosts. The most obvious are: create multiple events, one for each host create a template, create multiple symlinks to the template In this example, we will show how to use a single

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Page: Robustness Using Event Chaining
Introduction In a generally reliable network, machines are up most of the time. However, as soon a required machine goes down or becomes unavailable/inaccessible, we need to be able to adapt or at least report on the failure. We will show how to set up an

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Page: Singleton Type hcron Events
Introduction Executing the same event periodically runs the risk that one instance might try to execute before a previous one has completed. The reasons this can happen are varied: unintentional - a previous event is taking longer to complete than expecte

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Page: Time-Based Rotor Event
Introduction One of the main features of hcron is split+join combined with indexing. Using these we will set up a rotor event. Event We need a mechanism that will drive the rotor. The most obvious is to use one of the hcron datetime variables. We will use
Page: Troubleshooting
First Things to Verify The most common problems arise from: ssh user configuration not properly done - see Troubleshooting events not in the right location - see Troubleshooting General Snapshot Will not Load See hcron Guide. Compare the location of your

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Page: Ways to Use the include Directive
Introduction The include directive provides an easy and powerful way to reuse settings that are common to many events. What follows are some simple ways to leverage the include directive with a number of benefits: reduce boilerplate settings make wholesal

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