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Capistrano && SystemD
This document discusses using SystemD and cgroups to manage resources for Rails applications running on Linux servers. It recommends reading about SystemD and cgroups, creating service files, and using SSH to set them up on servers. It then introduces the capistrano-systemd-core gem, which provides a simple configuration and automation for setting up SystemD services with Capistrano deployments. Questions are welcomed on GitHub, Twitter, Facebook, or the company website.
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Capistrano && SystemD
- 1. Капістрано Та СістемД ОлександрСімонов CEO Amoniac OU RubyConfLT 2017
- 2. Capistrano && SystemD OleksandrSimonov CEO Amoniac OU RubyConfLT 2017
- 3. cat /dev/about/me Software Developer SystemAdministrator Engineer Founder Team Leader Speaker
- 4. Application Server 4 CPUs/ 48Gb RAM
- 5. Application Server Inside PostgreSQL9.5 Ruby 2.3.3 2 x Rails 4.2 Applications Puma Cluster 3x32 Sidekiq 3x25
- 6. Memory Usage AfterBoot PostgreSQL - 500Mb Puma Cluster - 120Mb Sidekiq - 100Mb Total: 500Mb DB + 440Mb Rails App
- 8. Memory Usage AfterOne Week PostgreSQL - 550Mb Puma Cluster - 2Gb Sidekiq - 1Gb Total: 550Mb DB + 6GB Rails App
- 10. Memory Usage AfterOne Month PostgreSQL - 570Mb Puma Cluster - 5Gb Sidekiq - 2,5Gb Total: 570Mb DB + 15GB Rails App
- 12. CPU Usage 4 CPUs 5Nginx processes (master + 4 workers) 8 Puma processes (master + 3 workers ) 2 Sidekiq processes Max 192 PostgreSQL processes (fork on every connection)
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- 14. IO Usage PostgreSQL -multiple DB files, log files Nginx - log files, requests cache, static files, file uploads Rails - log files, cache files, file uploads, third party services
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- 18. JAIL nice/ionice/renice FreeBSD Jail Solaris Zones LinuxControl Groups
- 19. Linux Control Groups CPUTime System memory Disk bandwidth Network bandwidth
- 20. Linux Control Groups CPUTime - max 20% of time System memory - 1GB max Disk bandwidth - 5Mb/sec Network bandwidth - 2Mb/sec
- 21. SystemD system and servicemanager event logger user session manager network interfaces manager device manager boot manager
- 26. systemd + cgroups Processsupervising Resource management Dependency management Logs management
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- 29. Make a reality Readabout SystemD
- 30. Make a reality Readabout SystemD Read about CGroups
- 31. Make a reality Readabout SystemD Read about CGroups Create service file
- 32. Make a reality Readabout SystemD Read about CGroups Create service file SSH to server and setup it
- 33. Make a reality Readabout SystemD Read about CGroups Create service file SSH to server and setup it SSH to all your servers and do the same
- 34. Make a reality Readabout SystemD Read about CGroups Create service file SSH to server and setup it SSH to all your servers and do the same PROFIT!
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- 38. capistrano-systemd-core Simple configuration Only 1line setup for each server No need in SUDO Support any command CPU, Memory and IO limitations Puma, Unicorn, Sidekiq and Resque special support in the future
- 39. Simple configuration set :systemd_services,{ puma: { cmd: 'puma -p 3000', cpu_quota: 70, memory_max: '1G' }, sidekiq: { cmd: 'sidekiq', cpu_quota: 30, memory_max: '512M' } }
- 40. Only 1 linesetup on server # loginctl enable-linger username
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- 43. Questions GitHub: @simonoff Twitter: @ceo_simonov FB:@ceosimonov Website: https://amoniac.eu