Resolving Load Balancing Issues in Mattermost High Availability (HA) Setup

Problem

Occasionally, users may encounter an issue where one Mattermost server bears the majority of the load while the others remain under utilised.

The issue can occur when the "ip_hash" algorithm is used in the Nginx configuration for load balancing the traffic to the Mattermost servers. This algorithm assigns clients based on their IP addresses, which can lead to uneven distribution of traffic among the Mattermost servers. Consequently, one server may handle most requests while others remain relatively idle.

Solution

To address this load balancing issue and ensure a more equitable distribution of requests, it is recommended to use the "least_conn" method in the Nginx configuration. The "least_conn" algorithm directs traffic to the server with the least number of active connections, promoting a more balanced workload across all Mattermost servers.

Steps to Implement "least_conn" Load Balancing:

  1. Open the Nginx Configuration File:
    • Locate and open the Nginx configuration file on your Reverse Proxy server.
  2. Locate the Upstream Block:
    • Within the configuration file, find the upstream block that defines the Mattermost servers. It typically starts with "upstream backend {".
  3. Replace "ip_hash" with "least_conn":
    • Change the load balancing algorithm from "ip_hash" to "least_conn." Modify the line within the upstream block to resemble the following:
    • upstream backend {
      least_conn;
      server SERVER_#1:8065;
      server SERVER_#2:8065;
      keepalive 32;
      }
  4. Save and Reload Nginx:
    • Save the changes to the configuration file and reload Nginx to apply the new settings.
    • sudo systemctl reload nginx
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