set rate-limit sessions global

Set the process-wide session rate limit.

Description Jump to heading #

By setting the global setting maxsessrate, you can limit the rate at which the load balancer creates sessions between clients and backend servers. When it reaches the limit, it stops accepting new connections. In the snippet below, 1,000 sessions per second are allowed:

haproxy
global
  maxsessrate 1000

haproxy
global
  maxsessrate 1000

Note that this limit is process-wide, so it is possible for one frontend to consume the majority of the capacity. However, you can also set a per-frontend limit with either the rate-limit sessions directive or with a stick table.

Use the set rate-limit sessions global command to change the global maxsessrate setting dynamically.

Examples Jump to heading #

Below, we set the global session rate limit to 5,000 sessions per second:

bash
echo "set rate-limit sessions global 5000" | \
  sudo socat stdio tcp4-connect:127.0.0.1:9999

bash
echo "set rate-limit sessions global 5000" | \
  sudo socat stdio tcp4-connect:127.0.0.1:9999

See also Jump to heading #

• set rate-limit connections global
• set rate-limit http-compression global
• set rate-limit ssl-sessions global