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
Read the original article Hit count: 150

Filed under:

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.

Related posts about haproxy

HA Proxy Stick-table and tcp-connection configuration

as seen on Server Fault - Search for 'Server Fault'
I am using HA Proxy HA-Proxy version 1.4.18 2011/09/16 I am trying to insert the following into /etc/init.d/haproxy.cfg file # Use General Purpose Couter (gpc) 0 in SC1 as a global abuse counter # Monitors the number of request sent by an IP over a period of 10 seconds stick-table type ip size 1m… >>> More
Rotate haproxy logs

as seen on Server Fault - Search for 'Server Fault'
I tried few things but still not able to rotate haproxy logs efficiently. I need to rotate logs when log files crosses 500 MB size. Considering haproxy is serving large no. of static tcp connections, I can not restart haproxy process though a reload is doable. Daily haproxy log file size normally… >>> More
could not bind socket while haproxy restart

as seen on Server Fault - Search for 'Server Fault'
I m restarting HAproxy by following command haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -sf $(cat /var/run/haproxy.pid) but i get following message [ALERT] 183/225022 (9278) : Starting proxy appli1-rewrite: cannot bind socket [ALERT] 183/225022 (9278) : Starting proxy appli2-insert:… >>> More
Restarting Haproxy Gracefully

as seen on Server Fault - Search for 'Server Fault'
As per various blogs, HAproxy can be gracefully restarted using the following command: sudo haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -sf $(cat /var/run/haproxy.pid) TO verify this, I had set up a apache bench script which contiguously sent message to haproxy. Ideally, whenever… >>> More
HAProxy: Display a "BADREQ" | BADREQ's by the thousands

as seen on Server Fault - Search for 'Server Fault'
My HAProxy Configuration. #HA-Proxy version 1.3.22 2009/10/14 Copyright 2000-2009 Willy Tarreau <[email protected]> global maxconn 10000 spread-checks 50 user haproxy group haproxy daemon stats socket /tmp/haproxy log localhost local0 log localhost local1 notice defaults … >>> More

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

Categories cloud