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HAProxy Opspack Overview
HAProxy is a free tool offering high availability, load balancing, and proxying for TCP and HTTP-based applications. Well-suited for high traffic websites, HAProxy has become the industry standard open-source load balancer and is often shipped with most mainstream Linux distributions as well as commonly deployed by default in cloud platforms.
Its mode of operation makes integration into existing architectures quite simple and keeps security top of mind, ensuring that valuable web servers with private information are not exposed.
What You Can Monitor
Opsview Monitor contains all the important service checks to make sure your HAProxy server is up and running. Service checks for HAProxy include:
- Connect time, current queue, and current sessions
- Error requests, session rate, warnings retried and more
- Denied connections, requests, responses and sessions
session_conn: The number of accepted connections
client_req: The number of client requests received
session_dropped: Checking varnish cache dropped sessions
cache_hit: Checking the number of cache hits
cache_miss: Checking the number of cache misses
cache_hitpass: Checks hits for pass
expired_objects: The total number of expired objects
nuked_objects: The total number of nuked objects
threads: The total number of threads
failed_threads: Total number of failed threads
threads_limited: Times the number of threads hit the maximum
threads_queue: Number of threads in the queue
session_queued: Number of sessions queued
backend_connections: Number of connections to the backend
backend_recycle: Number of recycled conections
backend_reuse: Number of reused connections
backend_fail: Number of failed connections
backend_unhealthy: Number of unhealthy connections
backend_busy: Number of busy connections
backend_req: Number of backend requests
backend_retry: Number of retried connections
HAProxy has been tested against version 1.5, 1.6 and 1.7. If you are running HAProxy version 1.5 or 1.6 three service checks will need to be deactivated as the metrics are not available for those versions. The service checks that need to be stopped are denied connections, denied sessions and intercepted requests.
Setting up HAProxy for monitoring:
To configure HAProxy, you need to set up a statistics page on the server. This can be done by editing haproxy.cfg the default location of the file is /etc/haproxy/haproxy.cfg, and this needs changing by running this command with your preferred editor. Then add the lines below to the file for each proxy if the stats haven't been set up already.
bind <Your haproxy IP>:<Port>
stats realm haproxy\ Statistics
stats uri /haproxy?stats
stats auth <Username>:<Password>
restart HAProxy with the command sudo service haproxy restart.
To test if the stats are running correctly, open a web browser and enter http://<Your haproxyIP>:<Port>/haproxy?stats and then view the statistics.
Setup and configuration:
To configure and utilize this Opspack, you simply need to add the 'Application - Haproxy' Opspack to the host running the HAProxy software, and specify the HAProxy user name, password, port and the stats URI path via the variable 'HAPROXY'. HaProxy creates new service checks for each proxy set up via the variable 'HAPROXY_PROXY'.
Step 1: Add the host template
Step 2: Add and configure the HAPROXY and HAPROXY_PROXY variables
Step 3: Reload and view the HAProxy statistics