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Zabbix at Nokia
September 9-10, Zabbix Conference
Riga, Latvia
INTRODUCTION
About the Speaker
Using Zabbix since 2001
Pleasure to work with the Zabbix team for 5+ years
A couple of books on Zabbix
INTRODUCTION
Who We Were
3310
INTRODUCTION
INTRODUCTION
Who We Are
Telecommunication and infrastructure
Hardware and software
INTRODUCTION
What We Use
Zabbix at (a single division of) Nokia
Not just Zabbix – a lot of different solutions
Not an endorsment
INTRODUCTION
What We Have
Zabbix 2.4 instance, production
Zabbix 2.4 instance, testing
Zabbix 2.4 instance, development
Zabbix 2.2, production
...these are the "new" systems
INTRODUCTION
What We Still Have
Zabbix 1.8, production
... x 2
Also, agents
INTRODUCTION
THAT OLD !>!!??1111one
"We released version n 3 months ago, WHY
HAVEN'T THEY UPGRADED YET ?"
"But the new version has nnnnn..."
"____FILL_IN____"
INTRODUCTION
The Reasons
Reason 1: the rule of .4
Reason 2: if it works...
Reason 3: it's complicated
INTRODUCTION
There's More
A few more Zabbix instances
Various versions
Planning to deploy 3.0 – cutting edge
INTRODUCTION
Backend
Oracle for 1.8
MySQL/MariaDB for anything after that
Main reasons:
● Licencing
● Reliability (sharing the database)
INTRODUCTION
Important Building Blocks
Scripts to collect the data
API-using tools
JMX (Java is popular – why?)
INTRODUCTION
The Three (Main) Topics
The experience of upgrading Zabbix
Other trouble
Suggested practice and solutions
UPGRADING PROBLEMS SOLUTIONS
Upgrading 1.8 to 2.4
Why do companies sit on old releases?
Upgrading is an effort.
UPGRADING PROBLEMS SOLUTIONS
Something Breaks
Investigation starts
● There are items
● Items stopped getting data
● Person who wrote this has moved on
UPGRADING PROBLEMS SOLUTIONS
When Something Breaks
Have to figure out:
● What does it do
● How to fix it
● Before that – where the hell is it
UPGRADING PROBLEMS SOLUTIONS
One Example of an API-using Script
"user.authenticate" method removed
'auth' not allowed in user.login
item "description" changed to "name"
"exists" methods removed
"& |" changed to "and or"
zabbix_sender changed "failed 0" to "failed: 0;"
UPGRADING PROBLEMS SOLUTIONS
Solved All That?
Still fails against one of the "new" systems
Remember, one of them was still 2.2
...so "& |" needed instead of "and or"
UPGRADING PROBLEMS SOLUTIONS
Three
Three cases:
● Old API, sender
● New API, sender + "& |"
● New API, sender + "and or"
UPGRADING PROBLEMS SOLUTIONS
Click Me
Links in alert emails – 3 versions again:
● 1.8 – patched version to show graph
● 2.2 – history.php?itemid=
● 2.4 – history.php?itemids[ ]=
UPGRADING PROBLEMS SOLUTIONS
Java GW Trouble
Java GW 2.0 – patched (endpoints, ports)
2.0 never times out, no time to forward-port
Solution – a remote command to restart...
UPGRADING PROBLEMS SOLUTIONS
Zabbix Server Trouble
Didn't use a feature before
Started using it, server crashes
Have an action on another Zabbix server to
restart this one ->
● WORKSFORME
(that server was upgraded quickly, though)
UPGRADING PROBLEMS SOLUTIONS
More Inter-version Template Fun
Have an updated template in 2.4
Import it in 2.2. Fail.
● Change "and or" back to "& |"
● ...remember to use the HTML entity
● Change some more
● Did they use spaces? Where they updated?
● ...dependencies
UPGRADING PROBLEMS SOLUTIONS
Migrating Users
Get their media, too – API method user.get
...doesn't return media in 1.8
DB it is
UPGRADING PROBLEMS SOLUTIONS
The Great Things When Upgrading
It's the little things
● Usability
● Links
● Maintainability
UPGRADING PROBLEMS SOLUTIONS
What We Notice
Newlines in trigger expressions
Links, links, links
● Link in simple graphs lost in 3.0...
Death to the dropdowns
Split users/groups in the administration section
UPGRADING PROBLEMS SOLUTIONS
The Non-shiny
Change design? The overworked peasant never
notices. Used to "enterprise" design.
Runtime loglevel changing? A lifesaver.
Less bugs. Really.
Human-friendly errors. Or any at all.
UPGRADING PROBLEMS SOLUTIONS
Upgrading to 3.0
...
...
eh ?
UPGRADING PROBLEMS SOLUTIONS
Templates and Upgrading to 3.0
Import a template that uses SNMP LLD
Get burnt
ZBX-10758
● XML import does not convert SNMP LLD rule
UPGRADING PROBLEMS SOLUTIONS
It's Not Perfect
The cynical doctor – "can you get to the door?"
...more like "got pimples? well, live with it"
UPGRADING PROBLEMS SOLUTIONS
Discovering Trouble
Network discovery script, returns tags
Rewritten, some tags reused
Misconfigured discovery ->
● all messed up (not getting away with it)
● audit not helpful
UPGRADING PROBLEMS SOLUTIONS
Action Fun
No built-in way to test actions
Create a trapper item+trigger
Limit an action to that single trigger
UPGRADING PROBLEMS SOLUTIONS
...Is Actionable
Successfully test the action
Delete test item & trigger
Email saying it's all good now
UPGRADING PROBLEMS SOLUTIONS
Action Trouble Is Here
What's wrong?
Action got silently disabled
https://github.com/whosgonna/Zabbix-Tiny.pm/blob/master/
examples/example_check_action_by_id.pl
UPGRADING PROBLEMS SOLUTIONS
New Item Not Working
...no, just the oldest value[s] missing
https://support.zabbix.com/browse/ZBX-9236
UPGRADING PROBLEMS SOLUTIONS
Graph Says It's All Good
Something alerts
Check the graph – straight line at 1, all good
...it's a trapper item
UPGRADING PROBLEMS SOLUTIONS
My Favourite Things
Monitoring -> Triggers
...made nearly useless by new triggers blinking
ZBX-7559 (single 'ok' event considered as a change)
UPGRADING PROBLEMS SOLUTIONS
That Comma
Suddenly items start failing
Value 82,82 not suported for float
iostat uses user locale – who starts the daemon
UPGRADING PROBLEMS SOLUTIONS
And You, curl
The same with curl
● $ curl -s -w '%{time_total} - %{speed_download}n'
www.zabbix.com -o /dev/null
● 0,701 – 55300,000
Initscripts or external checks/userparams
UPGRADING PROBLEMS SOLUTIONS
The Silence of Triggers
Scripts break, items get misconfigured
We get no alerts. Review unsupported items.
3.2 will be one hell of a time... but better
UPGRADING PROBLEMS SOLUTIONS
nodata() on Unsupported
<q1x> HALLEHLUJAH
<volter> Oh yes!
<Silvery> finally
UPGRADING PROBLEMS SOLUTIONS
When Scripts Roam Free
Lockfiles not being removed
...just monitor for that
UserParameter=vfs.files.older_than[*],find "$1" -ctime +$2 | wc -l
UPGRADING PROBLEMS SOLUTIONS
A (Quite) Rocky Horror Picure Show
Can't migrate template from newer -> older
Redo manually, forget the LLD filter
Get hundreds of thousands of items
● On a busy DB server
UPGRADING PROBLEMS SOLUTIONS
Services + Ports
Multiple JVMs or any other service
Often just a single port/item
Template proliferation
UPGRADING PROBLEMS SOLUTIONS
Multiple JVMs
Several JVMs on same host – a problem
● Patched Java GW
● Separate hosts
● Works out better maintenance-wise
UPGRADING PROBLEMS SOLUTIONS
Scripting the API
Creating items, triggers
Generating graphs and screens
General maintenance (users, host groups)
UPGRADING PROBLEMS SOLUTIONS
API Scripts
Weird load on Zabbix, triggers deleted/created
Function get_trigger_id unconditionally deletes
the trigger
Check your scripts, including logout
UPGRADING PROBLEMS SOLUTIONS
API Issues
New users are obliterated by validation/error
messages
Missing functionality – but gets better
API mostly works in recent versions
UPGRADING PROBLEMS SOLUTIONS
Audit Log
Many operations not recorded
Significant issue with many admin users
UPGRADING PROBLEMS SOLUTIONS
Syncing the Templates
Needed the templates to be the same across 5
Zabbix servers
Manual syncing
Looking into the API – after decomissioning 1.8
UPGRADING PROBLEMS SOLUTIONS
The Daily WTF
These problems weren't massive
But the small problems eat your time
Death by a thousand typos
UPGRADING PROBLEMS SOLUTIONS
ONCALL
Fueled by Zabbix notifications
A surprise of "Latest 20 issues" in the dashboard
Can't reorder elements in 1.8
● ...do collapsed elements still load data?
UPGRADING PROBLEMS SOLUTIONS
Supports Other Decisions
Something's down
Software acting weird
Capacity planning
UPGRADING PROBLEMS SOLUTIONS
Don't Use /
Data transfer on / can indicate problems
● Misconfiguraton
● Somebody outputing to /
Added special monitoring on Solaris DB servers
UPGRADING PROBLEMS SOLUTIONS
SSSSolaris
Discover partitions along their mountpoints
● 'join' can hang, 'awk' versions...
#!/bin/bash
while read partitionlongid partitionid mountpoint fstype; do
partitionlist="$partitionlist,"'{"{#PARTITIONID}":"'$partitionid'","{#PARTITIONLONGID}":"'
$partitionlongid'","{#FSTYPE}":"'$fstype'","{#MOUNTPOINT}":"'$mountpoint'"}'
done < <(/usr/xpg4/bin/awk '(NR == FNR){i[$1] = $2; n[$1] = $3; next}{print $1, $2, i[$1],
n[$1]}' <(mount -p | /usr/xpg4/bin/awk '{sub(".*/","",$1); sub("s0$","",$1); print $1, $3, $4}')
<(paste -d" " <(iostat -xn | awk '{print $NF}') <(iostat -x | awk '{print $1}') | tail +3))
echo '{"data":['${partitionlist#,}']}'
UPGRADING PROBLEMS SOLUTIONS
Have Guardrails
Write basic guidelines
http://zabbix.org/wiki/Docs/template_guidelines
It's easy to forget basics like usermacros
UPGRADING PROBLEMS SOLUTIONS
Paint Them Your Style
All triggers must have comments
Don't make triggers fire upon "it got worse"
Avoid cronjobs to feed data
● http://zabbix.org/wiki/Escaping_timeouts_with_atd
UPGRADING PROBLEMS SOLUTIONS
Trigger This
Most triggers are very simple
Some are so complex nobody understands them
This presentation resulted in a few triggers getting
fixed
UPGRADING PROBLEMS SOLUTIONS
Be Reasonable
Don't monitor what you don't need
● ...or monitor it infrequently
● ...and have triggers on it
It can reveal problems in an unexpected way
UPGRADING PROBLEMS SOLUTIONS
Shots in the Dark
CPU load alone can expose a lot
I/O load / iowait
It can also be used in unintented ways
UPGRADING PROBLEMS SOLUTIONS
For Your Own Safety
A file must be owned by root, permissions 100
World-readable on some systems
Userparameter for owner/permissions
UPGRADING PROBLEMS SOLUTIONS
SSL/TLS Certs
You want to renew them on time
There are a lot of certs
Monitor them all
#!/bin/bash
date -d "$(echo | openssl s_client -connect "$1":"$2" 2>/dev/null | 
openssl x509 -noout -enddate | sed 's/^notAfter=//')" "+%s"
UPGRADING PROBLEMS SOLUTIONS
How We Alert on Expiry
An alert goes out
● 60 days in advance
● 30 days in advance
● 15 days in... advance
UPGRADING PROBLEMS SOLUTIONS
Hooking Into the DB
Maintaining maintenance
Acknowledging things
Acknowledging all on host missing in the frontend
UPGRADING PROBLEMS SOLUTIONS
Try Not to Assume
Never assume others see what you see
Zabbix links are no good
Copy Zabbix graphs
UPGRADING PROBLEMS SOLUTIONS
Simple Minded
MySQL monitoring that's simple, robust,
lightweight...
Dump show variables; and vfs.file.regexp
UserParameter=mysql.table.discovery[*],for table in $(mysql $1 -Ne
"show tables;"); do tablelist="$tablelist,"'{"{#TABLE}":"'$table'"}'; done;
echo '{"data":['${tablelist#,}']}'
+ default MySQL table size userparameter
UPGRADING PROBLEMS SOLUTIONS
No Sharing
Do not share monitoring DB with production
● ...or testing, or QA, or whatever
We woke up IT, network guys, before we figured
out that one system was hammering the shared DB
UPGRADING PROBLEMS SOLUTIONS
If You Share Your Monitoring DB...
...monitoring will get broken when you already
have other trouble
Which is exactly when you want a reliable
monitoring
UPGRADING PROBLEMS SOLUTIONS
Glad You Solved It. Now Maintain It
Don't modify the product too much
Maintenance costs are higher that implementation
UPGRADING PROBLEMS SOLUTIONS
KISS
Simple is good
Documented is better
"Perfect is the enemy of good"
UPGRADING PROBLEMS SOLUTIONS
Nirvana Fallacy
When you never even begin an important task
because you feel reaching perfection is too hard
UPGRADING PROBLEMS SOLUTIONS
A Pretty Fly
"If you never miss a plane, you're spending too
much time at the airport"
Economist George Stigler
UPGRADING PROBLEMS SOLUTIONS
Explain and Document
False "job security" – you never get promoted
Two Zabbix script repos
● Some people work on one, some on another
UPGRADING PROBLEMS SOLUTIONS
Break Stuff
How can a webpage testing script fail?
● Connection fails
● Unexpected content
● Never times out
UPGRADING PROBLEMS SOLUTIONS
It Takes Time
Solving a problem is often easy
Solving it properly is hard
● Handle all the edge cases, write comments
● Accept named parameters
● Have some debug output
● ...
UPGRADING PROBLEMS SOLUTIONS
if you pay attention, nothing is simple
to explain anything, reduce it to simple
UPGRADING PROBLEMS SOLUTIONS
Wild West
Wild West people rush in, save the day, get the
fame
Poor peasants try to maintain that
Don't allow that to happen
UPGRADING PROBLEMS SOLUTIONS
Maintenance Is the King
Low maintenance cost makes Java popular
Neat but complicated will be thrown out in favour
of simple and robust (easy to maintain)
● Documentation can help a bit
USABILITY COMMUNITY CONCLUSION
Usability
Surprise topic
Based on comments people make about Zabbix
USABILITY COMMUNITY CONCLUSION
It's Very Decent
<DXManiac> I tell people here at the office
almost daily "Yes, the UI is cluttered and things
are complicated, but I wouldn't know how to cram
so many features in such a small place
in any better way" :)
USABILITY COMMUNITY CONCLUSION
You Better You Bet
USABILITY COMMUNITY CONCLUSION
Zabbix Has These Issues, But...
<fracklen> But on the other hand - zabbix does
have the feel of being well mature
<fracklen> and a great community
USABILITY COMMUNITY CONCLUSION
No Surprises
Zabbix positions itself as an enterprise solution
Enterprises want predictability
Knowing about changes in detail and in advance
can spare painful surprises
USABILITY COMMUNITY CONCLUSION
What's Important?
Built-in data gathering support less important
than:
● Input data fits the Zabbix data model
● Core system is functional, stable, easy to
debug
● Healthy, transparent development
Thank You
Zabbix team for building it
Participants of this great conference
Zabbix community
The conference team

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