Capistrano && SystemD
0 likes157 views
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.
Capistrano && SystemD
- 1. Капістрано Та СістемД Олександр Сімонов CEO Amoniac OU RubyConfLT 2017
- 2. Capistrano && SystemD Oleksandr Simonov CEO Amoniac OU RubyConfLT 2017
- 3. cat /dev/about/me Software Developer System Administrator Engineer Founder Team Leader Speaker
- 4. Application Server 4 CPUs / 48Gb RAM
- 5. Application Server Inside PostgreSQL 9.5 Ruby 2.3.3 2 x Rails 4.2 Applications Puma Cluster 3x32 Sidekiq 3x25
- 6. Memory Usage After Boot PostgreSQL - 500Mb Puma Cluster - 120Mb Sidekiq - 100Mb Total: 500Mb DB + 440Mb Rails App
- 8. Memory Usage After One Week PostgreSQL - 550Mb Puma Cluster - 2Gb Sidekiq - 1Gb Total: 550Mb DB + 6GB Rails App
- 10. Memory Usage After One Month PostgreSQL - 570Mb Puma Cluster - 5Gb Sidekiq - 2,5Gb Total: 570Mb DB + 15GB Rails App
- 12. CPU Usage 4 CPUs 5 Nginx processes (master + 4 workers) 8 Puma processes (master + 3 workers ) 2 Sidekiq processes Max 192 PostgreSQL processes (fork on every connection)
- 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
- 16. WHAT TO DO?!
- 18. JAIL nice/ionice/renice FreeBSD Jail Solaris Zones Linux Control Groups
- 19. Linux Control Groups CPU Time System memory Disk bandwidth Network bandwidth
- 20. Linux Control Groups CPU Time - max 20% of time System memory - 1GB max Disk bandwidth - 5Mb/sec Network bandwidth - 2Mb/sec
- 21. SystemD system and service manager event logger user session manager network interfaces manager device manager boot manager
- 26. systemd + cgroups Process supervising Resource management Dependency management Logs management
- 28. Make a reality
- 29. Make a reality Read about SystemD
- 30. Make a reality Read about SystemD Read about CGroups
- 31. Make a reality Read about SystemD Read about CGroups Create service file
- 32. Make a reality Read about SystemD Read about CGroups Create service file SSH to server and setup it
- 33. Make a reality Read about 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 Read about SystemD Read about CGroups Create service file SSH to server and setup it SSH to all your servers and do the same PROFIT!
- 36. WE NEED AUTOMATE IT!
- 38. capistrano-systemd-core Simple configuration Only 1 line 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 line setup on server # loginctl enable-linger username
- 41. Supported Limitations CPUQuota MemoryMax IOWeight Slice More in the future….
- 43. Questions GitHub: @simonoff Twitter: @ceo_simonov FB: @ceosimonov Website: https://amoniac.eu