DR hot/warm spare node patterns / anti-patterns?

[Martin Langhoff]

With our without puppet. We are looking at setting up DR nodes with
some draft ideas. We use puppet against a git repository (with ppg)
instead of against a puppet server. Nodes are actually VMs.

Configuration ideas:

- a filesystem-level flag that indicates that the node is running as
standby spare, to use as conditional in bash/python scripts as well as
in puppet

- some services enabled/disabled based on the standby flag

- some cronjobs check for standby flag

Areas of exploration

- keep standby nodes down, bring up periodically so that puppet gets
a chance to apply changes vs keep standby nodes up (perhaps with a
smaller/limited VM configuration).

- handling 'environment' differences
- mountpoints for app data point to different nfs servers
- different syslog, email servers
- ...

ideas? suggestions?



m
--
martin....@gmail.com
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- don't get distracted with shiny stuff - working code first
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