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echo "Backing up Nagios Core..."
tar czfp $mydir/nagios.tar.gz /usr/local/nagios

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#!/bin/bash
## Loop for merging multiple RRD performance data files in Nagios
## RA:MBX:11/04/2019

## Make sure you back everything up before working with this script.

## Also an alternative: https://gist.github.com/arantius/2166343

## Command to use
rrd_merge=/usr/local/nagiosxi/html/includes/components/performancedatatool/scripts/rrdmerge
## Source directory
source1_dir=/tmp/perfdata
## Second source directory
## Ideally this should not be the destination but that will work
source2_dir=/usr/local/nagios/share/perfdata
## Destination directory
## In this instance it is the same as the second source
destin_dir=/usr/local/nagios/share/perfdata

## Get all hosts that you have prepared for to merge data
for node in $(ls $source1_dir)
do
  ## Get all rrd files inside the host directory and use this for the destination variables
  for perfdata in $(ls $source1_dir/$node | grep .rrd)
  do
    ## Don't copy if there is not already something to merge to
    ## Old services may have been removed and the rrd files left behind.
    if [ -f $source2_dir/$node/$perfdata ]; then
      ## echo first to test or pipe to file for reference later, or do a few at a time
      ## You may receive errors if the service was deleted and recreated under the same name. I have no confirmation of this but
      ## this could be a problem. I think this is indicated by the error: "RRDs have different number of DSes."
      echo "$rrd_merge $source1_dir/$node/$perfdata $source2_dir/$node/$perfdata $destin_dir/$node/$perfdata"
      ## $rrd_merge $source1_dir/$node/$perfdata $source2_dir/$node/$perfdata $destin_dir/$node/$perfdata
    fi
  done
done