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Old 2nd February 2024
divaky divaky is offline
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Default CARP active/active configuration works with icmp but not with http

Hi,

i want to setup a carp loadbalancing with 2 webservers. The VIP Address is reachable via icmp i have checked this with tcpdump but if i check http always the webside of host b will be displayed and after 5 or 6 trys its take long until the page is displayed. Whats my fault?

here is my current config
Code:
#Host A
ifconfig inet 192.168.10.10/32
route add 192.168.10.1 -llinfo -link -iface re0
route add default 192.168.10.1

ifconfig carp0 10.10.10.10/32 carpdev re0 carpnodes 1:0,2:100 balancing ip-stealth
sysctl net.inet.carp.preempt=1


#Host B
ifconfig inet 192.168.10.11/32
route add 192.168.10.1 -llinfo -link -iface re0
route add default 192.168.10.1

ifconfig carp0 10.10.10.10/32 carpdev re0 carpnodes 1:100,2:0 balancing ip-stealth
sysctl net.inet.carp.preempt=1
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Old 2nd February 2024
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,989
Default

Hello, and welcome!

One thing I notice in your configuration is the use of /32 subnets. I use carp(4) with a single shared /24 subnet: one host using 10.0.1.254/24, the other, 10.0.1.253/24, and the shared-address carp(4) NIC assigned to 10.0.1.1/24. My configuration is master/backup, rather than load balancing.
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Old 2nd February 2024
divaky divaky is offline
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Quote:
Originally Posted by jggimi View Post
Hello, and welcome!

One thing I notice in your configuration is the use of /32 subnets. I use carp(4) with a single shared /24 subnet: one host using 10.0.1.254/24, the other, 10.0.1.253/24, and the shared-address carp(4) NIC assigned to 10.0.1.1/24. My configuration is master/backup, rather than load balancing.
Hi,

i have also tried a simpler setup for testing but the problem is still present. Master/Backup config make no problems but i need Master/Master in force for Loadbalancing.

Simpler /24 Test config
Code:
#Host A
ifconfig inet 192.168.10.10/24
route add default 192.168.10.1
ifconfig carp0 192.168.10.12/24 carpdev re0 carpnodes 1:0,2:100 balancing ip-stealth
sysctl net.inet.carp.preempt=1

#Host B
ifconfig inet 192.168.10.11/24
route add default 192.168.10.1
ifconfig carp0 192.168.10.12/24 carpdev re0 carpnodes 1:100,2:0 balancing ip-stealth
sysctl net.inet.carp.preempt=1
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Old 2nd February 2024
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jggimi jggimi is offline
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Location: USA
Posts: 7,989
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I see you've also posted the question on Reddit, where you will likely get more folks with carp(4) experience. I've never tested load balancing. All I know is that there are three balancing modes, and the choice between the modes depends on the admin's network environment and its capabilities.
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Old 2nd February 2024
divaky divaky is offline
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Quote:
Originally Posted by jggimi View Post
I see you've also posted the question on Reddit, where you will likely get more folks with carp(4) experience. I've never tested load balancing. All I know is that there are three balancing modes, and the choice between the modes depends on the admin's network environment and its capabilities.
Hi,

yes i have posted this question on other platforms too . Because its heavy to find help for this problem. I hope i find a solution in anyway.
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Old 2nd February 2024
J65nko J65nko is offline
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An alternative method for load balancing is relayd.
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Old 7th February 2024
divaky divaky is offline
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Quote:
Originally Posted by J65nko View Post
An alternative method for load balancing is relayd.
In final setup i want to have 2 reverse proxy balanced with carp. With relayd only i have a single point of failure. But thanks for you help.
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