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Recursive inventory management Martin F. Krafft madduck@debian.org - PowerPoint PPT Presentation

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Recursive inventory management Martin F. Krafft madduck@debian.org 13 Aug 2013 @ DebConf 13, Vaumarcus, Switzerland Configuration management (system administration) Configuration management CFEngine bcfg2 Puppet Chef Salt Ansible

  1. reclass and Salt Provides top and pillar data Adapter is a Salt module, since 0.16.0 nodegroups not yet implemented (Salt issue #5787)

  2. reclass and Ansible Provides inventory and node information

  3. reclass and Ansible Provides inventory and node information Implemented as external script

  4. reclass and Ansible Provides inventory and node information Implemented as external script Does not yet support batched calls (recent Ansible feature)

  5. Enough of this boring stuff!

  6. Parametrisation is key Parametrise modules as much as possible

  7. Parametrisation is key Parametrise modules as much as sensible

  8. Parametrisation is key Parametrise modules as much as sensible At all cost, avoid special-casing in module code

  9. Parametrisation is key Parametrise modules as much as sensible At all cost, avoid special-casing in module code Reclass allows you to keep your parameters modular

  10. Parametrisation is key Parametrise modules as much as sensible At all cost, avoid special-casing in module code Reclass allows you to keep your parameters modular Define your data in one place only (no redundancy)

  11. reclass node definition blue.example.org.yaml: --- applications: - postfix - ntp parameters: ntp: server: 0. pool.ntp.org

  12. reclass node definition blue.example.org.yaml: --- applications: - postfix - ntp parameters: ntp: server: 0. pool.ntp.org

  13. But wait! You promised recursion!

  14. yaml fs YAML files for nodes in $inventory base uri/nodes

  15. yaml fs YAML files for nodes in $inventory base uri/nodes YAML files defining classes in $inventory base uri/classes

  16. yaml fs YAML files for nodes in $inventory base uri/nodes YAML files defining classes in $inventory base uri/classes Nodes and classes files may specify classes to inherit

  17. yaml fs YAML files for nodes in $inventory base uri/nodes YAML files defining classes in $inventory base uri/classes Nodes and classes files may specify classes to inherit You can think of classes as tags, too!

  18. yaml fs YAML files for nodes in $inventory base uri/nodes YAML files defining classes in $inventory base uri/classes Nodes and classes files may specify classes to inherit You can think of classes as tags, too! Smart (deep) merging on return from recursive descent walk

  19. reclass node definition nodes/blue.example.org.yaml: classes: - common - mailserver parameters: ntp: server: 0.ch.pool.ntp.org classes/common.yaml: applications: - ntp parameters: ntp: server: 0. pool.ntp.org

  20. reclass node definition nodes/blue.example.org.yaml: classes: - common - mailserver parameters: ntp: server: 0.ch.pool.ntp.org classes/common.yaml: applications: - ntp parameters: ntp: server: 0. pool.ntp.org

  21. reclass node definition nodes/blue.example.org.yaml: classes: - common - mailserver parameters: ntp: server: 0.ch.pool.ntp.org classes/common.yaml: applications: - ntp parameters: ntp: server: 0. pool.ntp.org

  22. More specific classes override data defined in less specific classes

  23. reclass node definition nodes/blue.example.org.yaml: classes: - common - mailserver - hosted@zurich classes/hosted@zurich.yaml: parameters: ntp: server: 0.ch.pool.ntp.org

  24. reclass node definition nodes/blue.example.org.yaml: classes: - common - mailserver - hosted@zurich classes/hosted@zurich.yaml: parameters: ntp: server: 0.ch.pool.ntp.org

  25. Multiple inheritance well-defined order

  26. reclass node definition nodes/blue.example.org.yaml: classes: - ssh-server classes/ssh-server.yaml parameters: permit root login: no

  27. reclass node definition nodes/blue.example.org.yaml: classes: - ssh-server - backup-client classes/ssh-server.yaml parameters: permit root login: no classes/backup-client.yaml parameters: permit root login: without-password

  28. reclass node definition nodes/blue.example.org.yaml: classes: - ssh-server - backup-client classes/ssh-server.yaml parameters: permit root login: no classes/backup-client.yaml parameters: permit root login: without-password classes: - ssh-server

  29. Parameter interpolation nodes/diamond.example.org.yaml: classes: - motd classes/motd.yaml parameters: motd: message: $ { floyd reference }

  30. Parameter interpolation nodes/diamond.example.org.yaml: classes: - motd parameters: - floyd reference: Shine on, you crazy diamond classes/motd.yaml parameters: motd: message: $ { floyd reference }

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