Reference

set maxconn server

Change a server’s maximum concurrent connections (maxconn) setting.

Description Jump to heading

You can define a maxconn setting on each server line in a backend section of your configuration. This limits the number of concurrent connections that the load balancer will relay to that server. When this limit is reached, connections queue up in the backend until a server slot becomes free.

haproxy
backend webservers
server s1 192.168.0.10:80 maxconn 30
server s2 192.168.0.11:80 maxconn 30
server s3 192.168.0.12:80 maxconn 30
haproxy
backend webservers
server s1 192.168.0.10:80 maxconn 30
server s2 192.168.0.11:80 maxconn 30
server s3 192.168.0.12:80 maxconn 30

Use the set maxconn server command to change this limit dynamically. A value of zero is allowed.

Examples Jump to heading

Below, we set the server s1 in the backend webservers to have a maxconn of 20:

bash
echo "set maxconn server webservers/s1 20" | \
sudo socat stdio tcp4-connect:127.0.0.1:9999
bash
echo "set maxconn server webservers/s1 20" | \
sudo socat stdio tcp4-connect:127.0.0.1:9999

See also Jump to heading

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