Zabbix

Links

• Homepage
• zabbix 4 database schema
• https://www.digitalocean.com/community/tutorials/introduction-to-queries-mysql
• compilation instructions
• Documentation
• Examples of Common Queries
• Custom scripts
• Various scripts to automate tasks in Zabbix
• Tuning mysql for zabbix
• https://huyabbix.com
• Migrating zabbix database with minimal downtime
• Bug tracker
• Clean up database
• Zabbix and selinux
• Apache/SSL checks
• Zabbix on RHEL/Centos
• Grafana
• https://blog.zabbix.com/zabbix-ha-cluster-setups/8264/ Zabbix HA cluster]

• Very old network diagram
• Fighting zabbix alert floods

 

Zabbix API

• The Zabbix API
• API and python

Installing from git

git clone https://github.com/zabbix/zabbix.git
cd zabbix 
./bootstrap.sh

 

Zabbix error codes

Z3005

Database issue

Items

Item dialog

• Item documentation

Units

• B
• uptime
• unixtime

proc.mem

proc.mem[<name>,<user>,<mode>,<cmdline><memtype>]

name

??

cmdline

probably the one to look for

 

 

 

Templates

• Community templates

Configuration

Zabbix agent active

On server

Set Agent IP to 0.0.0.0

 

Zabbix and SQL

Find hosts with hostmacro defined

select h.host, m.macro, m.value from hosts h, hostmacro m where macro like '%FOO%' and h.hostid = m.hostid;

FAQ

SERVER

Adjust loglevel

zabbix_server --runtime-control log_level_increase=trapper
      

 

Reload zabbix server configuration

You can't, but you might want

zabbix_server -c /etc/zabbix/zabbix_server.conf -R config_cache_reload

 

The frontend does not match Zabbix database.

Probably version conflict between frontend and server

 

value cache working in low memory mode

Increase ValueCacheSize

 

 

PROXY

Nodata and proxy

https://www.zabbix.com/documentation/5.0/en/manual/introduction/whatsnew500#no-data-triggers-sensitive-to-proxy-availability

Zabbix proxy poller processes more than 75% busy

A passive proxy went away?

Zabbix does not support SQLite3 database upgrade.

Stop the proxy and (re)move the .db file

[Z3002] cannot create database 'zabbix_proxy': [0] unable to open database file

fix path

 

Cannot parse heartbeat from active proxy

TBD, probably name issue

Troubleshoot high queue on proxy

• https://blog.zabbix.com/how-to-troubleshoot-zabbix-proxy-high-queue/12244/

poller data processes

StartPollers

cannot obtain data from proxy "proxybox": ZBX_TCP_READ() failed: [104] Connection reset by peer

?????

 

force "sending configuration data to proxy"

zabbix_proxy -R config_cache_reload

 

 

 

Front end

Visable name vs hostname

Visible name: {HOST.NAME}

Hostname: {HOST.HOST}

Host IP: (as defined in Interface->IP/DNS) {HOST.CONN}

 

Acknowledge multiple items

Monitor->Problems apply filters, select all, mass update

 

No permissions to referred object or it does not exist!

Graph no longer exists. Porbably items no longer discovered

Cannot add host

??

SNMP

Cannot find host interface on "xxxhost" for item key foo

Might mean you're trying to import an SNMP template before configuring SNMP for the host

 

 

Agent side ping check

UserParameter=pingtime[*],fping -e $1|sed 's/^.*(\([0-9].*\) ms).*$/\1/g'
UserParameter=pingalive[*],fping $1|grep -q alive;echo $?

 

 

IPMI

IPMI Monitoring account for zabbix

https://www.thomas-krenn.com/en/wiki/Configuring_IPMI_under_Linux_using_ipmitool

 

cannot connect to IPMI host: [22] Operation canceled

Usually temporary because of broken ipmi lib, ignore it

 

cannot connect to IPMI host: [16777411] Unknown error 16777411

classic, probably authentication problem

zabbix_sender

processed: 0; failed: 1

Possible causes:

• incorrect hostname
• incorrect item key
• item not in the server configuration cache yet
• Allowed hosts in trapper item
• phase of moon
• aliens

 

Testing zabbix_sender

zabbix_sender stuff

Filters

The regular expressions referred to in discovery are found under Administration->General, and then "Regular expressions" in the dropdown at top right of the page

cannot connect to IPMI host: [125] Operation canceled

possibly authentication method issue

Discover: value must be a JSON object

Could mean you need to escape slashes

 

Cannot create item: Invalid first parameter

Problably a calculated item, try doublequoting the item key:

last("foo[bar]")

 

Install recent zabbix on CentOS/RHEL

rpm -ivh https://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm
yum install zabbix-agent

Discovery data example

Output of a discovery script should look like:

{"data":[
  {"{#VAR1}":"value11","#{VAR2":"value12"},
  {"{#VAR1}":"value21","#{VAR2":"value22"}
]}

Backing up tables

https://www.zabbix.org/wiki/Docs/howto/mysql_backup_script

 

cannot send list of active checks

If in agent log: most likely ServerActive is defined in agent config, while not used at all

It is also possible agent is sending some active check to server while host is monitored via proxy.

active check configuration update started to fail

??

Latest 20 issues

DEFAULT_LATEST_ISSUES_CNT in/usr/share/zabbix/include/defines.inc.php

 

Zabbix unreachable poller processes more than 75% busy

Increase StartPollersUnreachable

 

Zabbix poller processes more than 75% busy

another mystery

More than 100 items having missing data for more than 10 minutes

Could be high load. Also check Administration->Queue

Zabbix escalator processes more than 75% busy

probably high system load overall

Check agent

zabbix_get -s my.host.com -k agent.version

ZBX_NOTSUPPORTED

Could be anything, enable logging on agent. It could be version mismatch. Check

zabbix_get -s yourhost -k agent.version

If that works, you're calling for an undefined or unsupported key.

Incorrect trigger expression. Host "xx" does not exist or you have no access to this host.

Means there's no related item.

zabbix_get returns nothing

best look at log on agent side

run playbook on single host

ansible_playbook -l somehost somplay.yml

 

Zabbix server is not running: the information displayed may not be current

Might be selinux: http://sysads.co.uk/2013/11/zabbix-server-running-alert/

 

 

 

Monitoring vmware

vmware.hv.cpu.usage[{$URL},{HOST.HOST}]" became not supported: Couldn't resolve host name

Set macro {$URL} to https://your.ip/sdk/ (shouldn't discovery figure that out from {$HOST} ?
      

Couldn't resolve host name

Sometimes it's a matter of waiting a few hours

 

vmware events collector returned empty result

???

No "vmware collector" processes started.

Check StartVMwareCollectors on server or proxy

 

unsupported item key

This might mean it's expecting a value from the script you're calling.

echo 1

became not supported: Not supported by Zabbix Agent

probably output by userparameter/script

ansible or API not showing host groups

Permissions!! See Administration->User Groups

 

failed to update local proxy configuration copy: invalid field name "items.lastlogsize"

check everything :)

Received value [11] is not suitable for value type [Numeric (unsigned)] and data type [Decimal]

This probably means the agent returned 1\n1

 

database is down: retrying in 10 seconds

try upping max_connections

[Incorrect key file for table 'items'; try to repair it

Could be something /tmp related

 

 

another network error, wait for 8 seconds

UnreachableDelay=8

 

failed: first network error

Setting Timeout in server configuration

also Timeout in agents?

 

no active checks on server

???

 

 

show cpu utilization

Monitoring->host->graphs