Note: I’ve been very busy on the past couple of months with my personal life and work. Thanks for filing issues and feature requests. I’ll start to go through them and provide updates very soon.

Squid Prometheus exporter

Exports squid metrics in Prometheus format

NOTE: From release 1.0 metric names and some parameters has changed. Make sure you check the docs and update your deployments accordingly!

New

• Using environment variables to configure the exporter
• Adding custom labels to metrics
• Enabling TLS for exporter via WebConfig

Usage:

Simple usage:

squid-exporter -squid-hostname "localhost" -squid-port 3128

Configure Prometheus to scrape metrics from localhost:9301/metrics

- job_name: squid
  # squid-exporter is installed, grab stats about the local
  # squid instance.
  target_groups:
    - targets: ['localhost:9301']

To get all the parameteres, command line arguments always override default and environment variables configs:

squid-exporter -help

The following environment variables can be used to override default parameters:

SQUID_EXPORTER_LISTEN
SQUID_EXPORTER_WEB_CONFIG_PATH
SQUID_EXPORTER_METRICS_PATH
SQUID_HOSTNAME
SQUID_PORT
SQUID_LOGIN
SQUID_PASSWORD
SQUID_EXTRACTSERVICETIMES

Usage with docker:

Basic setup assuming Squid is running on the same machine:

docker run --net=host -d boynux/squid-exporter

Setup with Squid running on a different host

docker run -p 9301:9301 -d boynux/squid-exporter -squid-hostname "192.168.0.2" -squid-port 3128 -listen ":9301"

With environment variables

docker run -p 9301:9301 -d -e SQUID_PORT="3128" -e SQUID_HOSTNAME="192.168.0.2" -e SQUID_EXPORTER_LISTEN=":9301" boynux/squid-exporter

Build:

This project is written in Go, so all the usual methods for building (or cross compiling) a Go application would work.

If you are not very familiar with Go you can download the binary from releases.

Or build it for your OS:

go install https://github.com/boynux/squid-exporter

then you can find the binary in: $GOPATH/bin/squid-exporter

Features:

• Expose Squid counters
  • Client HTTP
  • Server HTTP
  • Server ALL
  • Server FTP
  • Server Other
  • ICP
  • CD
  • Swap
  • Page Faults
  • Others
• Expose Squid service times
  • HTTP requests
  • Cache misses
  • Cache hits
  • Near hits
  • Not-Modified replies
  • DNS lookups
  • ICP queries
• Expose squid Info
  • Squid service info (as label)
  • Connection information for squid
  • Cache information for squid
  • Median Service Times (seconds) 5 min
  • Resource usage for squid
  • Memory accounted for
  • File descriptor usage for squid
  • Internal Data Structures
• Histograms
• Other metrics
• Squid Authentication (Basic Auth)

FAQ:

• Q: Which versions of Squid are supported?

• A: Squid version 3.2.0.10 and later.

• Q: Why are no Squid metrics reported by the exporter?
• A: This usually means that the exporter cannot reach the Squid server, or that the cachemgr ACLs are incorrect. To debug and mitigate:

  • First make sure that the host running the exporter can access the Squid cachemgr URL, e.g.: curl http://localhost:3128/squid-internal-mgr/info

  • If that fails, verify that the Squid ACL configuration allows the exporter host to access the cachemgr. In the following example, a custom prometheus ACL is defined to allow cachemgr endpoint access from outside the Squid host, via the network (use with caution).

    acl prometheus src 192.0.2.0/24
    http_access allow localhost manager
    http_access allow prometheus manager
    http_access deny manager
    

• Q: Why process_open_fds metric is not exported?
• A: This usualy means exporter don’t have permission to read /proc/<squid_proc_id>/fd folder. You can either

1. [recommended] Set CAP_DAC_READ_SEARCH capability for squid exporter process (or docker). (eg. sudo setcap 'cap_dac_read_search+ep' ./bin/squid-exporter)
2. [not recommended] Run the exporter as root.

Contribution:

Pull request and issues are very welcome.

If you found this program useful please consider donations

Copyright:

MIT License