Use backups if unavailable (not just down)

Posted by PriceChild on Server Fault See other posts from Server Fault or by PriceChild
Published on 2011-07-05T14:38:19Z Indexed on 2012/09/01 9:40 UTC
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haproxy

Using haproxy, I want:

A pool of 'main' servers and 'backup' servers, though they don't necessarily have to be in separate pools.
Each backend has a low 'maxconn' (in this case 1)
Clients should not wait in a queue. If there are no immediately available servers in the 'main' pool they should be shunted to the 'backup' pool without delay.

Right now I have one backend, 'main' servers have an absurdly high weighting and it 'works'.

acl use_backend + connslots is along the right lines but without the patch in my own answer it isn't perfect.

Bonus points for not requiring a modified haproxy binary.

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Developer IT

Use backups if unavailable (not just down) - Developer IT

Use backups if unavailable (not just down)

haproxy

Related posts about haproxy

HA Proxy Stick-table and tcp-connection configuration

Rotate haproxy logs

could not bind socket while haproxy restart

Restarting Haproxy Gracefully

HAProxy: Display a "BADREQ" | BADREQ's by the thousands

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