Attivare il mapping dei nomi SNMP delle interfacce in NTOP

Questo script mappa i nomi delle interfacce snmp estraendo gli IP dei monitored devices da redis

export NTOPSNMPCOMMUNITY="public"

• Creare lo script:

cat > /usr/local/sbin/make_snmp_mappings.sh <<EOFile 
#!/bin/bash

COMMUNITY=$1
NEW_DEV_DETECTED="1"

if [ -z "$COMMUNITY" ]
then
 echo "Usage: $0 snmp_community_name"
 exit 127
fi

IPS=$(redis-cli -h 127.0.0.1 --scan --pattern '*' | grep snmp| grep system | cut -f 2-5 --delimiter='.')
if [ -f /etc/nprobe/snmp_mappings.txt ]
then
 /bin/mv -f /etc/nprobe/snmp_mappings.txt /etc/nprobe/snmp_mappings.txt.old
fi

for IP in $IPS
do
        echo "Adding $IP"
       /usr/local/sbin/build_snmp_mappings.sh $IP 2c ${COMMUNITY} >> /etc/nprobe/snmp_mappings.txt
done

if [ -f /etc/nprobe/snmp_mappings.txt.old ]
then
 diff -q /etc/nprobe/snmp_mappings.txt /etc/nprobe/snmp_mappings.txt.old
 NEW_DEV_DETECTED="$?"
fi

if [ $NEW_DEV_DETECTED -eq "1" ]
then
        echo "New device detected. Restart Nprobe"
        #echo "New device detected. Restart Ntop and Nprobe"
        #systemctl restart ntopng.service
        for UNIT in $(systemctl list-units nprobe\* --all | grep nprobe | grep '\.service' | tr -s ' '  | cut -f 2 --delimiter=' ')
        do
                systemctl restart $UNIT
        done
else
        echo "No new devices detected"
fi
EOFile

• Renderlo eseguibile

chmod +x /usr/local/sbin/make_snmp_mappings.sh

• Creare il link allo script che crea il file, o copiare e customizzare l'originale per usare la descrizione dell'interfaccia:

ln -s /usr/local/sbin/build_snmp_mappings.sh /usr/bin/build_snmp_mappings.sh

• Provare lo script

/usr/local/sbin/make_snmp_mappings.sh $NTOPSNMPCOMMUNITY

• Creare il cronjob

cat > /etc/cron.d/ntopngSnmpMappings <<EOFile 
# Check for new SNMP deviced and map them every 5 minutes
/5 * * * * root /usr/local/sbin/make_snmp_mappings.sh $NTOPSNMPCOMMUNITY > /dev/null
EOFile