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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
This Opspack allows you to monitor all the metrics you need to efficiently run a HAProxy Server, providing service checks for connections, requests, responses and sessions, as well as the number of ingoing and outgoing bytes.
|Bytes||Checks the bytes in and bytes out|
|Connect Time||The time in ms for a session to connect|
|Currrent Queue||The current number in the queue|
|Denied Connection||The number of denied connections|
|Denied Requests||The number of denied requests|
|Denied Response||The number of denied responses|
|Denied Sessions||The number of denied sessions|
|Error Connections||The number of error connections|
|Error Requests||The number of error requests|
|Error Response||The number of error responses|
|Intercepted Requests||The number of intercepted requests|
|Queue Time||The time in ms of the queue session|
|Request Rate||The number of requests per second|
|Request Time||The time in ms of the session request|
|Response Codes||The number of code responses of each type|
|Session Rate||The number of sessions per second|
|Sessions Used||The percentage of used sessions|
|Status||Checks the status of the proxy|
|Warnings Redispatched||The number of redispatched warnings|
|Warnings Retried||The number of retried warnings|
Set up HAProxy for Monitoring
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, these are; denied connections, denied sessions and intercepted requests.
To configure HAProxy, you need to set up a statistics page on the server.
Step 1: Update the haproxy.cfg
/etc/haproxy/haproxy.cfg with the lines below for each proxy.
listen stats bind <Your haproxy IP>:<Port> mode http stats enable stats hide-version stats realm haproxy\ Statistics stats uri /haproxy?stats stats auth <Username>:<Password>
Step 2: Restart HAProxy
sudo service haproxy restart
Step 3: Test the stats are running correctly
http://<Your haproxyIP>:<Port>/haproxy?stats and view the statistics.
Setup and Configuration
To configure and utilize this Opspack, you simply need to add the 'Application - Haproxy' Opspack to your Opsview Monitor system.
Step 1: Add the host template
Add the Application - Haproxy Host Template to your Opsview Monitor host.
For more information, refer to Opsview Knowledge Center - Adding Host Templates to Hosts.
Step 2: Add and configure variables required for this host
|HAPROXY||The information for your haproxy setup. Ensure you override Username, Password, Port and Stats Path with the same values as your
|HAPROXY_PROXY||The Value is the name of the HAProxy you want to monitor. You can add multiple variables to check the status of each proxy individually.|
For more information, refer to Opsview Knowledge Center - Adding Variables to Hosts.