Actually added the doc and contents

doc/Installation/Migrating-from-Observium.md

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+## Migrating from Observium to LibreNMS
+
+A LibreNMS user, [Dan](https://twitter.com/thedanbrown), has kindly provided full details and scripts to be able to migrate from Observium to LibreNMS.
+
+See [his](https://vlan50.com/2015/04/17/migrating-from-observium-to-librenms/) blog for full details.
+
+We have mirrored the scripts he's provided with consent, these are available in the `scripts` folder of your installation called LibreNMS.zip.

scripts/Migration/Standard_Conversion/convert_no_xml.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# First we SSH to LibreNMS and create necessary directories with  #
+# the mkdir script. Then the script enters each Observium RRD dir #
+# and SCPs the RRD files to the correct directory on LibreNMS.    #
+# After that we add all of the devices to LibreNMS using the      #
+# destwork script.                                                #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Run as Root from the Observium server                           #
+#                                                                 #
+# Enter values for DEST, L_RRDPATH, O_RRDPATH, MKDIR, DESTSCRIPT, #
+# and NODELIST. The defaults should work if you put the files in  #
+# the same location.                                              #
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+
+# Enter LibreNMS IP or hostname here
+DEST=10.0.253.35
+# Enter LibreNMS RRD path here
+L_RRDPATH=/opt/librenms/rrd/
+# Enter Observium RRD path here
+O_RRDPATH=/opt/observium/rrd/
+# Enter path to mkdir script here
+MKDIR=/tmp/mkdir.sh
+# Enter path to destwork script here
+DESTSCRIPT=/tmp/destwork.sh
+# Enter path to nodelist text file
+NODELIST=/tmp/nodelist.txt
+
+# This line SSHs to LibreNMS server and makes directories based on node list text file
+ssh root@$DEST 'bash -s' < $MKDIR
+
+# Conversion and transfer loop 
+while read line; 
+	# Enter RRD Directory
+	do cd $O_RRDPATH"${line%/*}" 
+		# Transfer RRD files to LibreNMS Server
+		scp *.rrd root@$DEST:$L_RRDPATH"${line%/*}"/ 
+		# Exit to parent dir
+		cd ..
+	done < $NODELIST
+
+# This line SSHs to LibreNMS server and runs the destwork script to finish conversion
+ssh root@$DEST 'bash -s' < $DESTSCRIPT

scripts/Migration/Standard_Conversion/destwork_no_xml.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# A simple script to add each host in text file to LibreNMS       #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Enter values for ADDHOST, SNMPSTRING, and NODELIST. The default # 
+# should work if you put the files in the same location.          #
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+# Enter path to LibreNMS addhost module
+ADDHOST=/opt/librenms/addhost.php
+# Enter your unique SNMP String
+SNMPSTRING=cisconetwork
+# Enter path to nodelist text file
+NODELIST=/tmp/nodelist.txt
+
+while read line 
+	# Add each host from the node list file to LibreNMS
+	do php $ADDHOST "${line%/*}" $SNMPSTRING v2c;
+done < $NODELIST

scripts/Migration/Standard_Conversion/mkdir.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# A simple script to create needed directories on LibreNMS server #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Enter values for NODELIST, L_RRDPATH. The default should work if# 
+# you put the files in the same location.                         #
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+# Enter path to node list text file
+NODELIST=/tmp/nodelist.txt
+# Enter path to LibreNMS RRD directories
+L_RRDPATH=/opt/librenms/rrd/
+
+# This loop enters the RRD folder and creates dir based on contents of node list text file
+while read line 
+	do mkdir -p $L_RRDPATH"${line%/*}"
+done < $NODELIST

scripts/Migration/Standard_Conversion/nodelist.txt

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+example1.yourdomain.net
+example2.yourdomain.net
+example3.yourdomain.net

scripts/Migration/XML_Conversion/convert.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# First we SSH to LibreNMS and create necessary directories with  #
+# the mkdir script. Then the script enters each Observium RRD dir #
+# converts the RRDs to XML and SCPs the XML files to the correct  #
+# directory on LibreNMS. After that we add all of the devices to  #
+# to LibreNMS using the destwork script.                          #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Run as Root from the Observium server                           #
+#                                                                 #
+# Enter values for DEST, L_RRDPATH, O_RRDPATH, MKDIR, DESTSCRIPT, #
+# and NODELIST. The defaults should work if you put the files in  #
+# the same location.                                              #
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+# Enter LibreNMS IP or hostname here
+DEST=10.0.253.35
+# Enter LibreNMS RRD path here
+L_RRDPATH=/opt/librenms/rrd/
+# Enter Observium RRD path here
+O_RRDPATH=/opt/observium/rrd/
+# Enter path to mkdir script here
+MKDIR=/tmp/mkdir.sh
+# Enter path to destwork script here
+DESTSCRIPT=/tmp/destwork.sh
+# Enter path to nodelist text file
+NODELIST=/tmp/nodelist.txt
+
+# This line SSHs to LibreNMS server and makes directories based on node list text file
+ssh root@$DEST 'bash -s' < $MKDIR
+
+# Conversion and transfer loop 
+while read line; 
+	# Enter RRD Directory
+	do cd $O_RRDPATH"${line%/*}" 
+		# Convert each RRD to XML
+		for f in *.rrd; do rrdtool dump ${f} > ${f}.xml; done
+		# Transfer XML file to LibreNMS Server
+		scp *.xml root@$DEST:$L_RRDPATH"${line%/*}"/ 
+		# Exit to parent dir
+		cd ..
+	done < $NODELIST
+
+# This line SSHs to LibreNMS server and runs the destwork script to finish conversion
+ssh root@$DEST 'bash -s' < $DESTSCRIPT

scripts/Migration/XML_Conversion/destwork.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# This script converts the XML files from Observium back to RRD   #
+# files for use with LibreNMS. It then adds the device using the  #
+# Addhost function of LibreNMS                                    #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Enter values for L_RRDPATH, ADDHOST, SNMPSTRING, and NODELIST.  #
+#The default should work if you put the files in the same location#
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+# Enter path to LibreNMS RRD directories
+L_RRDPATH=/opt/librenms/rrd/
+# Enter path to LibreNMS addhost module
+ADDHOST=/opt/librenms/addhost.php
+# Enter your unique SNMP String
+SNMPSTRING=cisconetwork
+# Enter path to nodelist text file
+NODELIST=/tmp/nodelist.txt
+
+# Loop enters RRD directory and then each folder based on contents of node list text file
+while read line 
+	# Enter the directory
+	do cd $L_RRDPATH"${line%/*}"
+		# Convert from XML back to RRD
+		for f in *.xml; do rrdtool restore ${f} `echo ${f} | cut -f1 -d .`.rrd; done;
+		# Remove leftover XML files
+		rm *.xml;
+		# Add the host to LibreNMS
+		php $ADDHOST "${line%/*}" $SNMPSTRING v2c;
+		# Change back to parent directory
+		cd ..; 
+	done < $NODELIST

scripts/Migration/XML_Conversion/mkdir.sh

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+#!/bin/bash
+# Observium to LibreNMS conversion
+
+####################### SCRIPT DESCRIPTION ########################
+# A simple script to create needed directories on LibreNMS server #
+###################################################################
+
+########################### DIRECTIONS ############################
+# Enter values for NODELIST, L_RRDPATH. The default should work if# 
+# you put the files in the same location.                         #
+###################################################################
+
+############################# CREDITS #############################             
+# LibreNMS work is done by a great group - http://librenms.org    #
+# Script Written by - Dan Brown - http://vlan50.com               #
+###################################################################
+
+# Enter path to node list text file
+NODELIST=/tmp/nodelist.txt
+# Enter path to LibreNMS RRD directories
+L_RRDPATH=/opt/librenms/rrd/
+
+# This loop enters the RRD folder and creates dir based on contents of node list text file
+while read line 
+	do mkdir -p $L_RRDPATH"${line%/*}"
+done < $NODELIST

scripts/Migration/XML_Conversion/nodelist.txt

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+example1.yourdomain.net
+example2.yourdomain.net
+example3.yourdomain.net