Show recent HAProxy configuration parse errors
Build a paste-ready command, then review its compatibility and effects before running it.
haproxy -c -V -f /etc/haproxy/haproxy.cfg 2>&1 | tail -20read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementshaproxyhaproxy must be installed and available on PATH.
Version supporthaproxy Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsConfiguration file is validRepresentative successful output; values vary with the selected target and system state.
Known errorshaproxy: command not foundhaproxy is missing or is not available on PATH.
Verifyhaproxy -c -V -f /etc/haproxy/haproxy.cfg 2>&1 | tail -20The output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01haproxyCommandRuns the haproxy stage of this one-liner.
02-cOptionConfigures haproxy with the -c option.
03-VOptionConfigures haproxy with the -V option.
04-fOptionKeeps following new output or selects the command-specific force/file mode.
05/etc/haproxy/haproxy.cfgArgumentPasses /etc/haproxy/haproxy.cfg to haproxy.
062>&1RedirectionRedirects command input, standard output, or error output.
07|PipelinePasses the output on the left to the command on the right.
08tailCommandRuns the tail stage of this one-liner.
09-20OptionConfigures tail with the -20 option.
Example input
haproxy -c -V -f /etc/haproxy/haproxy.cfg 2>&1 | tail -20
Example output
Configuration file is valid
Illustrative output — exact values vary by system and data.
Official sources