Forwarder Installation Script

I have created the script below to deploy forwarders to Linux servers. Hopefully it is of use to others in the community.

If you execute the script it will tell you which parameters it expects to receive.

The script expects to deploy a .tgz but could easily be tweaked to install an RPM, DEB or similar package. However in those situations I would generally look to utilise whatever package management system is available (e.g. a Satellite server for RedHat) to make patching easier.

I hope you find this helpful.

#!/bin/bash

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### Splunk> Forwarder Mass Deployment Script ###
### Author:   David Anso - GKC Limited       ###
### Version:  1.0                            ###
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### www.gkc.co.nz

REMOTE_HOST=$1
REMOTE_USER=$2
REMOTE_PATH="$3"
ENABLE_KEYBASED_AUTH=$4
ENABLE_BOOT_START=$5

SPLUNKFORWARDERTGZ="splunkforwarder-4.3-115073-Linux-x86_64.tgz"
INSTALLER_HOME="/home/splunker/install-forwarder/"
SPLUNKDEPLOYCLIENTCONF="deploymentclient.conf"
SSH_PUBLIC_KEY="/home/splunker/.ssh/id_rsa.pub"

cd $INSTALLER_HOME

if [ -z $5 ]
then
    echo "Usage: $0 Host User Path Enable_SSHKeys EnableBootStart"
    echo " e.g.: $0 splunkforwarder1 splunkuser /opt 1 1"
    exit 1
fi

if [ $ENABLE_KEYBASED_AUTH -gt 0 ]
then
    cat $SSH_PUBLIC_KEY | ssh $REMOTE_HOST -l $REMOTE_USER "if [ ! -e .ssh ] ; then mkdir ~/.ssh; fi ; cat \ >>~/.ssh/authorized_keys ; chmod 600 ~/.ssh/authorized_keys ;chmod 700 ~/.ssh"
    ssh $REMOTE_HOST -l $REMOTE_USER echo If you only typed the password once then key based auth is working.
fi

echo "Copying files..."
scp $SPLUNKFORWARDERTGZ $SPLUNKDEPLOYCLIENTCONF $REMOTE_USER@$REMOTE_HOST:$REMOTE_PATH
ssh $REMOTE_HOST "
    cd $REMOTE_PATH; 
    tar -xzf $REMOTE_PATH/$SPLUNKFORWARDERTGZ ;  
        rm $REMOTE_PATH/$SPLUNKFORWARDERTGZ ;
        mv $REMOTE_PATH/$SPLUNKDEPLOYCLIENTCONF $REMOTE_PATH/splunkforwarder/etc/system/local/deploymentclient.conf;
        splunkforwarder/bin/splunk start --accept-license
"

echo ""

if [ $ENABLE_BOOT_START -gt 0 ]
then
    echo "Enabling Boot Start..."
    ssh $REMOTE_HOST -t -l $REMOTE_USER "sudo $REMOTE_PATH/splunkforwarder/bin/splunk enable boot-start"
fi