PACEMAKER(8)

💅 PACEMAKER — like, the manual page bestie

okay so first things first: this is page PACEMAKER(8) from System Administration Utilities, and the actual command you'll be typing is crm_mon. Part of the Pacemaker cluster resource manager, iykyk 👑

✨ NAME ✨

Pacemaker — Part of the Pacemaker cluster resource manager. that's the whole name section, she's brief and iconic 🎀

🌸 SYNOPSIS 🌸

crm_mon [options]

🦋 DESCRIPTION 🦋

Provides a summary of cluster's current state. literally that's her job 💅

Outputs varying levels of detail in a number of different formats. so many formats. she's versatile like that ✨

💖 OPTIONS 💖

🎀 Help Options:

• -h, --help — Show help options
• --help-all — Show all help options
• --help-output — Show output help
• --help-display — Show display options
• --help-additional — Show additional options

🍓 Output Options:

• --output-as=*FORMAT* — Specify output format as one of: console (default), html, text, xml, none
• --output-to=*DEST* — Specify file name for output (or - for stdout)
• --html-cgi — Add CGI headers (requires --output-as=html)
• --html-stylesheet=*URI* — Link to an external stylesheet (requires --output-as=html)
• --html-title=*TITLE* — Specify a page title (requires --output-as=html)

🧚 Display Options:

• -I, --include=*SECTION(s)* — A list of sections to include in the output. See Output Control help for more information.
• -U, --exclude=*SECTION(s)* — A list of sections to exclude from the output. See Output Control help for more information.
• --node=*NODE* — When displaying information about nodes, show only what's related to the given node, or to all nodes tagged with the given tag
• --resource=*RSC* — When displaying information about resources, show only what's related to the given resource, or to all resources tagged with the given tag
• -n, --group-by-node — Group resources by node
• -r, --inactive — Display inactive resources
• -f, --failcounts — Display resource fail counts
• -o, --operations — Display resource operation history
• -t, --timing-details — Display resource operation history with timing details
• -c, --tickets — Display cluster tickets
• -m, --fence-history=*LEVEL* — Show fence history: 0=off, 1=failures and pending (default without option), 2=add successes (default without value for option), 3=show full history without reduction to most recent of each flavor 🌈
• -L, --neg-locations — Display negative location constraints [optionally filtered by id prefix]
• -A, --show-node-attributes — Display node attributes
• -D, --hide-headers — Hide all headers
• -R, --show-detail — Show more details (node IDs, individual clone instances)
• --show-description — Show resource descriptions
• -b, --brief — Brief output

🌟 Additional Options:

• -i, --interval=*TIMESPEC* — Update frequency (default is 5 seconds). Note: When run interactively on a live cluster, the display will be updated automatically whenever the cluster configuration or status changes.
• -1, --one-shot — Display the cluster status once and exit
• -d, --daemonize — Run in the background as a daemon. Requires at least one of --output-to and --external-agent.
• -E, --external-agent=*FILE* — A program to run when resource operations take place
• -e, --external-recipient=*RCPT* — A recipient for your program (assuming you want the program to send something to someone).
• -W, --watch-fencing — Listen for fencing events. For use with --external-agent.

💜 Application Options:

• -$, --version — Display software version and exit
• -V, --verbose — Increase debug output (may be specified multiple times)
• -Q, --quiet — Be less descriptive in output.

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📝 NOTES 📝

Time Specification:

The TIMESPEC in any command line option can be specified in many different formats. It can be:

• an integer number of seconds
• a number plus units (us/usec/ms/msec/s/sec/m/min/h/hr)
• an ISO 8601 period specification

so yeah, she's flexible like that 😌

🫶 OUTPUT CONTROL 🫶

By default, a particular set of sections are written to the output destination. The default varies based on the output format: XML includes all sections by default, while other output formats include less. no cap 🎀

This set can be modified with the --include and --exclude command line options. Each option may be passed multiple times, and each can specify a comma-separated list of sections. The options are applied to the default set, in order from left to right as they are passed on the command line. For a list of valid sections, pass --include=list or --exclude=list. ✨

🦄 INTERACTIVE USE 🦄

When run interactively, crm_mon can be told to hide and show various sections of output. To see a help screen explaining the options, press ?. Any key stroke aside from those listed will cause the screen to refresh.

ok this is lowkey the fun part, she's interactive 💅

🔥 EXAMPLES 🔥

Display the cluster status on the console with updates as they occur:

crm_mon

Display the cluster status once and exit:

crm_mon -1

Display the cluster status, group resources by node, and include inactive resources in the list:

crm_mon --group-by-node --inactive

Start crm_mon as a background daemon and have it write the cluster status to an HTML file:

crm_mon --daemonize --output-as html --output-to
/path/to/docroot/filename.html

Display the cluster status as XML:

crm_mon --output-as xml

👑 AUTHOR 👑

Written by Andrew Beekhof and the Pacemaker project contributors. absolute legends, fr fr 🫶

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and that's the whole page bestie!! this lil beauty is Pacemaker 3.0.3+20260728.7052..., dated September 2026, and she's out here serving PACEMAKER(8) realness 💖✨ go forth and cluster, mwah 🎀