Disable NTP Time warning in CheckMk 2.0

General
20

I tracked down the problem to the Linux Agent and the variable MK_RUN_ASYNC_PARTS set in the systemctl service file

# grep ASYNC /etc/systemd/system/check_mk@.service
Environment="MK_RUN_ASYNC_PARTS=false"

The behaviour is

  • chrony.cache file is outdated long time ago.
  • opening a connection to port 6556 runs fine but it does not update the chrony.cache file.
  • Running manually the Linux Agent does update the chrony.cache file and therefore the alert is cleared.

I guess the following part of the run_cached function in the Linux Agent ends before reach the last lines because of the value of the MK_RUN_ASYNC_PARTS variable.


    $MK_RUN_ASYNC_PARTS || return

    # Cache file outdated and new job not yet running? Start it
    if [ -z "$USE_CACHEFILE" ] && [ ! -e "$CACHEFILE.new" ]; then
        # When the command fails, the output is throws away ignored
        if [ $mrpe -eq 1 ]; then
            echo "set -o noclobber ; exec > \"$CACHEFILE.new\" || exit 1 ; run_mrpe $NAME \"$CMDLINE\" && mv \"$CACHEFILE.new\" \"$CACHEFILE\" || rm -f \"$CACHEFILE\" \"$CACHEFILE.new\"" | nohup /bin/bash >/dev/null 2>&1 &
        else
            echo "set -o noclobber ; exec > \"$CACHEFILE.new\" || exit 1 ; $CMDLINE && mv \"$CACHEFILE.new\" \"$CACHEFILE\" || rm -f \"$CACHEFILE\" \"$CACHEFILE.new\"" | nohup /bin/bash >/dev/null 2>&1 &
        fi
    fi

Test:

# date
Mon Mar 27 15:00:32 CEST 2023
# ll /var/lib/check_mk_agent/cache/chrony.cache
-rw------- 1 root root 497 Mar 27 11:25 /var/lib/check_mk_agent/cache/chrony.cache
# export MK_RUN_ASYNC_PARTS=false
# check_mk_agent >/dev/null 2>&1
# ll /var/lib/check_mk_agent/cache/chrony.cache
-rw------- 1 root root 497 Mar 27 11:25 /var/lib/check_mk_agent/cache/chrony.cache

# unset MK_RUN_ASYNC_PARTS
# check_mk_agent >/dev/null 2>&1
# ll /var/lib/check_mk_agent/cache/chrony.cache
-rw------- 1 root root 497 Mar 27 15:02 /var/lib/check_mk_agent/cache/chrony.cache

Best regards

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