Upgrading BIG-IQ with a Data Collection Device from Version 6.0 and later with Minimal Downtime

#!/bin/bash

es_client_file="/var/config/appiq/upgrade/es_client.py"
upgrade_analytics_data_5_6_file="/var/config/appiq/upgrade/upgrade_analytics_data_5_6.py"
appiq_version=`grep -P -o "Version: [\w.]+" /VERSION|cut -d ':' -s -f2|tr -d '[:space:]'`
appiq_product=`grep -P -o "Product: [\w.-]+" /VERSION|cut -d ':' -s -f2|tr -d '[:space:]'`
timeout_perl_cmd="perl -p -i -e 's/(timeout=)14400/\${1}144000/g'"
reindex_tries_cmd="perl -p -i -e 's/(\s+.*reindex\(.*tries = )10(.*)/\${1}1\${2}/g'"
reindex_no_delete_tries_cmd="perl -p -i -e 's/(\s+.*reindex_no_delete\(.*tries = )10(.*)/\${1}1\${2}/g'"

function log()
{
###log error messages###
[ ! "$1" ] && return 0
/bin/echo -e "[$(/bin/date +%m/%d/%y\ %H:%M:%S.%2N)] - $1" >> /var/log/upgrade_analytics_data.log
}

if [ $appiq_product != "BIG-IQ" ]; then
    log "not \"BIG-IQ\" product, (found: $appiq_product)! exiting..."
    exit 99 
fi

if [ $appiq_version != "7.1.0" ]; then
    log "not \"7.1.0\" version, (found: $appiq_version)! exiting..."
    exit 99
fi

log "Modifying \"$es_client_file\" file"
if [ -f $es_client_file ]; then
    $(eval "$timeout_perl_cmd $es_client_file")
    $(eval "$reindex_tries_cmd $es_client_file")
    $(eval "$reindex_no_delete_tries_cmd $es_client_file")
    log "\"$es_client_file\" file has been modified!"
else
    log "file \"$es_client_file\" doesn't exist...skipping parsing!"
fi

log "Modifying \"$upgrade_analytics_data_5_6_file\" file"
if [ -f $upgrade_analytics_data_5_6_file ]; then
    $(eval "$timeout_perl_cmd $upgrade_analytics_data_5_6_file")
    log "\"$upgrade_analytics_data_5_6_file\" file has been modified!"
else
    log "file \"$upgrade_analytics_data_5_6_file\" doesn't exist...skipping parsing!"
fi

chmod +x /config/startup_analytics_upgrade_change.sh

 chmod +w /config/startup

 /config/startup_analytics_upgrade_change.sh &