Salting things up in the sysadmin's world Juan Manuel Santos Who? - - PowerPoint PPT Presentation

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Salting things up in the sysadmin's world Juan Manuel Santos Who? - - PowerPoint PPT Presentation

Oct 17, 2023 368 likes •966 views

Salting things up in the sysadmin's world Juan Manuel Santos Who? (boring part) Juan Manuel Santos godlike64 on github / gmail / twitter godlike on freenode Information Systems Engineer / RHCA TL - STSE @ Red Hat Need beer

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Salting things up in the sysadmin's world

Juan Manuel Santos

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2015-07-21

Who? (boring part)

  • Juan Manuel Santos
  • godlike64 on github / gmail / twitter
  • godlike on freenode
  • Information Systems Engineer / RHCA
  • TL - STSE @ Red Hat
  • Need beer to survive, HALP!
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WHY?

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WHY?

1)Quantity

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12712414

  • SLOC count for Linux kernel 3.19
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WHY?

1)Quantity 2)Complexity

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Sysadmins are lazy

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How it all began

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#plzhelp

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? :)

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Basics

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Basics

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Terminology

  • Master - Minion
  • State file --> State
  • Highstate
  • Grains / Pillar
  • Matching (targeting)
  • ... and stuff
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Terminology

  • Master: the one who rules them all
  • Minions:

– ID – [Nodegroup] – Grains

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Example setup

  • Master: gantrithor
  • Minions:

– everybody else

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States & Highstates

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States

  • Defined by SLS (SaLt State) files
  • Reside in the filesystem
  • In /etc/salt/master:

file_roots:

<environment>:

  • <path>
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Top file (top.sls)

  • Entry point for environment
  • Host matching

<environment>:

<match>:

  • match: <match type>
  • [state trees]
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States

  • Where the magic happens
  • Similar syntax to top.sls

<identifier>:

<type>:

  • parameters
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States

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States

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States

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States

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Highstate

  • salt '*' state.highstate

1) Minions download top.sls 2) Minions attempt to match 3) If a match is found, modules are downloaded, compiled & executed

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Highstate

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Matching & Nodegroups

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Matching

  • ID
  • Nodegroup
  • Subnet/IP
  • Grains
  • Compound
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Matching

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Nodegroups

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Nodegroups

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Nodegroups

  • Flexibility!

nodegroups:

group1: 'L@foo.domain.com,bar.domain.com' group2: 'G@os:Debian and foo.domain.com' group3: 'G@os:Debian and N@group1'

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Grains & Pillars

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Grains

  • Bits & pieces of information
  • Generated/loaded on minion startup
  • salt [...] grains.ls
  • salt [...] grains.items
  • 50+ grains shipped
  • Moar flexibility: write your own!
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Grains

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Grains

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Pillar

  • Also data
  • Defined on the master
  • In /etc/salt/master:

pillar_roots:

<environment>:

  • <path>
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Pillar

  • Grains --> data retrieved from minions
  • Pillar --> data sent to minions
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Pillar

iic

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Pillar

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Pillar

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Pillar

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Docs!

  • http://docs.saltstack.com/
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Thank you!

  • Questions anyone?