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Splunk for Real time alerting and monitoring. www.gtri.com
1.
Copyright*©*2012*Splunk*Inc.* Real*Time*Aler=ng*&*Monitoring* Ledion*Bi=ncka*
2.
Got*Alerts?* 2* Aler=ng*basics* Modes*of*aler=ng* Control*knobs* Managing* Ques=ons?*
3.
Intro* Sr*SoIware*Architect* 1870*days*@Splunk* * * * 3* Scheduler*&*Aler=ng* Summary*Indexing*Field*Extrac=ons*
4.
Alert*anatomy* 4* SMS* Email* SNMP* Script* No#fica#on( Condi#on( Data( search* basics*
5.
Types*of*alerts** 5* basics* Alerts* Digest* Per*result* Historical* Real*=me** Search*type* Digest* Per*result* No=fica=on*type*
6.
RealY=me*search*primer* Search*forward*in*=me** * * Never*complete*(unless*stopped)* Constantly*upda=ng*result*set* Only*generates*results*preview* All*search*commands*supported* * 6* basics* now* RT(search(Historical*search*
7.
Per*result*aler=ng* New*in*4.3* One*no=fica=on*per*result* Per*result*suppression** * Example:* Send*me*an*email(for(each(user(who*has*more*than*5*failed*logins*in*a*30* minute*window.** * 7* basics*
8.
Scheduler* Periodically*executes*searches* Evaluate*condi=ons** Execute*no=fica=ons** * 8* Alerts** Summary*Indexing* Dashboard* basics*
9.
Splunkd/* Scheduler* Search* Process* =me* Search* Start** historical*search* audit.log* search.log* Y* N* No=fy** splunkd* splunkd_access.log* Suppress?* audit.log* Search** done* Y *Execute(ac#ons( Y *Update*ar=fact*TTL* Y *Suppression*update* Y *Alert*manager*N* Y* Done* scheduler.log* Logging* Condi=on* Results* Scheduled*search*alerts*basics*
10.
RealY=me*alerts* Splunkd/* Scheduler* Search* Process* =me* RT* Search* Start** RT*search* audit.log* search.log* Y* N* No=fy** splunkd* splunkd_access.log* Suppress?* Y *Execute(ac#ons( Y *Update*ar=fact*TTL* Y *Suppression*update* Y *Alert*manager* N* Y* Logging* Condi=on* ResPrev* Done* scheduler.log* Condi=on* ResPrev* N* Y* …..* Results* Snapshot* basics*
11.
Aler=ng*modes** Event*occurrence** * Periodic*aggregate** * Sliding*aggregate* * 11*
12.
Event*occurrence* Search:* * *all*=me,*real*=me* Condi=on:*
*always* No=fica=on:* *per*result** Use*when:* *absolutely*need*to*know*when** **************************something*(fatal)*happens*ASAP* * 12* modes**
13.
Periodic*aggregate* Search:* * *historical* Condi=on:*
*use*case*specific* No=fica=on:* *digest*or*perYresult* Use*when:* *Medium*priority*alerts*that*need*to* ***************************be*evaluated*over*a*set*of*results* * 13* modes**
14.
Sliding*aggregate* Search:* * *windowed*real*=me* Condi=on:*
*use*case*specific* No=fica=on:* *digest*or*per*result** Use*when:* *Higher*priority,*need*to*know*when** ***************************a*sliding*window*matches*condi=on* * 14* modes**
15.
Control*knobs* Scheduling* Suppression* Customiza=on* ** 15*
16.
Scheduling* Condi=on*evalua=on*frequency* Should*match*search*range** Limited*resources** Queues*&*skips* 16* knobs*
17.
Suppression* Stops*no=fica=on** Time*based** RealY=me*&*historical*searches* Field*based*suppression* ****Y*alert*me*for*each(user(who*has*more*than*5*failed*logins*in*a** *********30*minute*window,**but*not*more*than*once*an*hour*for*each(user( 17* knobs*
18.
Customizing* *Email*fields* * *Scripts* * *Custom* *alert*ac=ons* 18* knobs*
19.
Customizing* *Email*fields* * *Scripts* * *Custom* *alert*ac=ons* 19* knobs*
20.
Customizing* *Email*fields* * *Scripts* * *Custom* *alert*ac=ons* 20* knobs*
21.
Customizing* *Email*fields* * *Scripts* * *Custom* *alert*ac=ons* 21* knobs* 1. Build*an*external*search*cmd* 2. Declare*it*as*an*alert*ac=on* in*alert_ac#ons.conf( 3.
Reference*the*ac=on*in* savedsearches.conf*as* ac=on.<ac=onYname>* *
22.
Managing*alerts* Alert*manager** Scheduler*dashboards* Capacity*planning* Logs** 22*
23.
Alert*manager* *Collec=on*of*triggered*alerts* *See*all*alerts*in*one*place* ** 23* manage*
24.
Scheduler*dashboards* *Troubleshoo=ng* *Understanding*load* *Tracing*load*origin* 24* manage*
25.
Capacity*planning** 25* manage*
26.
Capacity*planning*Y*basics* Alert*==*search* Search*bandwidth*limited*by*#CPUs* ********Limit*=*4*x*#CPU* Scheduler*limited*to*25%* * * * 26* manage* Scheduler* Ad*hoc*
27.
Capacity*planning*Y*op=ons* Use*the*right*alert*mode* Schedule*alerts*at*reasonable*periods* *****there*are*1440*minutes*/*day*** Consider*increasing*scheduler*limit** Increase*search*bandwidth* 27* manage*
28.
Logs*&*.conf* *scheduler.log* *savedsearches.conf* *alert_ac=ons.conf* *limits.conf* 28* manage*
29.
Aler=ng*Summary* 29* *Basics* *Control*knobs* *Customizing* *Managing* ***
30.
Ques=ons?* 30*
31.
You*might*also*like*these*sessions* ** 31* …*
32.
Expira=on* *Alert*tracking* *How*long*is*the*alert*kept* *Alert*manager* *Affects*TTL* 32* knobs*
33.
Ar=fact*TTL* Painful*to*understand*!* Base*TTL:*2*x*scheduled*period* Alert*TTL:*max*TTL*specified*by*ac=ons* ******************OR*alert*expira=on* ****************** * 33* knobs*
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Ar=fact*TTL,*exercise** ****************** * 34* knobs* Schedule( period( Ac#ons( Expira#on( TTL( Ar#facts(( 24(hours((
35.
Ar=fact*TTL,*exercise** ****************** * 35* knobs* Schedule( period( Ac#ons( Expira#on( TTL( Ar#facts(( 24(hours(( 1(
Hourly( None( None( 2(hours( 2(
36.
Ar=fact*TTL,*exercise** ****************** * 36* knobs* Schedule( period( Ac#ons( Expira#on( TTL( Ar#facts(( 24(hours(( 1*
Hourly* None* None* 2*hours* 2* 2( Hourly( Email( None( 24(hours( 24(
37.
Ar=fact*TTL,*exercise** ****************** * 37* knobs* Schedule( period( Ac#ons( Expira#on( TTL( Ar#facts(( 24(hours(( 1*
Hourly* None* None* 2*hours* 2* 2* Hourly* Email* None* 24*hours* 24* 3( 5(minutes( None( 24(hours( 24(hours( 288(
38.
Ar=fact*TTL,*exercise** ****************** * 38* knobs* Schedule( period( Ac#ons( Expira#on( TTL( Ar#facts(( 24(hours(( 1*
Hourly* None* None* 2*hours* 2* 2* Hourly* Email* None* 24*hours* 24* 3* 5*minutes* None* 24*hours* 24*hours* 288* 4( minute( Email( 12(hours( 24(hours(( 1440(