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Capistrano and SystemD

The document discusses system management and resource allocation for application servers using Capistrano and systemd. It provides technical specifications and memory usage metrics for services such as PostgreSQL, Puma, and Sidekiq over time, highlighting the need for automation and configuration simplicity. Additionally, it outlines a Capistrano-systemd-core tool for efficient server setup and resource management, including command configurations and limitations.

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