Monitoraggio ZFS in Zabbix

Monitoraggio POOLs e Datasets

• Sul client, scaricare il file e scompattarlo

cd /tmp && \
wget "https://share.zabbix.com/index.php?option=com_mtree&task=att_download&link_id=350&cf_id=38" -O ZFSonLinux.zip && \
unzip ZFSonLinux.zip && \
cd ZFSonLinux

• Installare i files

mv ZFSonLinux_sudo_rules /etc/sudoers.d/
mv  ZFSonLinux_userparameters.conf /etc/zabbix/zabbix_agentd.d/

• Verificare se i comandi funzionano (DATA è il nome di un pool zfs presente):

sudo -u zabbix /usr/bin/sudo /sbin/zpool list -H -o health DATA

• Riavviare zabbix_agent

systemctl restart zabbix-agent.service

• Dal server o dal prozy zabbix, verificare che le keys siano supportate:

zabbix_get -s 192.168.1.10 -k zfs.zpool.health[DATA]

• Importare il template ZFSonLinux_template.xml suls erver ed assegnare il template all'host

ZFSonLinux

• Definire la Regex in

Administration / General/ Regular Expression

Name: ZFS Fileset
Expressions
  Expression type: Character string included
  Expression: /

Monitoraggio degli snapshot

• Per far questo, occorre utilizzare la versione customizzata del template Zabbix

• Creare lo script di collecting dei timestamp deglis napshot:

mkdir -p /etc/zabbix/scripts

cat > /etc/zabbix/scripts/zabbix-zfs-snapshot <<EOFile
#!/bin/bash
# Delay maximum half an hour
set -x 
if [ -z "$1" ]
then
	sleep $((RANDOM % 1800))
fi

# Clear temp file
/bin/rm -f /tmp/zfs-snapshot.dat.tmp

# Append lines in temp file
for DATASET in $(/usr/bin/sudo /sbin/zfs list \
					| grep -v '^NAME' \
					| /usr/bin/tr -s ' ' | /usr/bin/cut -f 1 --delimiter=' ')
do 
	TIMESTAMP=$(/usr/bin/sudo \
					/sbin/zfs get creation -Hpr -t snapshot  ${DATASET} \
					| /usr/bin/cut -f 3 | /usr/bin/sort -n | /usr/bin/tail -n 1) 
	if [ -z "$TIMESTAMP" ]
	then
		DATETIME=""
	else
		DATETIME=$(/bin/date -d @$TIMESTAMP +"%Y-%m-%d %H:%M:%S")
	fi
	echo ${DATASET} $TIMESTAMP $DATETIME >> /tmp/zfs-snapshot.dat.tmp
done

# Substitute real file with temp file
mv /tmp/zfs-snapshot.dat.tmp /var/lib/zabbix/zfs-snapshot.dat
EOFile

chmod +x zabbix-zfs-snapshot

• Abilitarlo in cron:

cat > /etc/cron.d/zabbix-zfs-snapshot <<EOFile
# Creates zfs snapshot time creation log file
#
#min    hours   DayOfMonth      Month   DayOfWeek user     command
# Incr backup mon-tue
0      *      *               *      *        zabbix /etc/zabbix/scripts/zabbix-zfs-snapshot
EOFile

• Impostare il sudoers

cat > /etc/sudoers.d/zabbix-zfs-snapshot <<EOFile
Defaults:zabbix !requiretty

zabbix ALL=(ALL) NOPASSWD: /sbin/zfs
EOFile

• Definire gli userparamters:

cat > /etc/zabbix/zabbix_agentd.d/zfs-snapshot.conf <<EOFile
UserParameter=zfs.snapshot.time[*],/bin/cat /var/lib/zabbix/zfs-snapshot.dat | grep $1 | /usr/bin/cut  --delimiter=' ' -f 2 
EOFile

• Assicurarsi che ci sia la homedir di zabbix:

mkdir -p /var/lib/zabbix
chown zabbix:zabbix /var/lib/zabbix

• Riavviare zabbix agent

systemctl restart zabbix-agent.service

• Provare a lanciare manualmente lo script per il collecting dei timestamp:

 sudo -u zabbix /etc/zabbix/scripts/zabbix-zfs-snapshot

Riferimenti

• Monitoring your ZFS pools in Zabbix – Marin Atanasov Nikolov – A place about Open Source Software, Operating Systems and some random thoughts
• Zabbix Share - ZFS on Linux