You are browsing a read-only backup copy of Wikitech. The live site can be found at wikitech.wikimedia.org
Jump to navigation Jump to search
Revision as of 12:18, 5 June 2019 by (add another meaning of “canary”)
The term “canary” can describe different things:
- The debug servers, e. g. mwdebug1002, are sometimes called canaries. Changes are often deployed to them via
scap pullbefore deploying them everywhere with
- Scap has the notion of canary hosts: when deploying a change, it will first deploy it to a subset of servers, then pause for a bit and check their error rate. If enough canary servers experience a significantly higher error rate, the deployment is automatically rolled back.
- group0 wikis are sometimes called canary wikis. Problems with a new MediaWiki version may be discovered there before they start affecting the bigger wikis.