PM2 presentation @JSCONF.asia @Singapore

2. • CEO & Founder at
• Author of
• Full Stack Javascript developer
• Technologist

3. My app is ready, now what?

4. Deploying to production is complex
• Oh noes why my app only use 10% of my server CPUs?
• Oh noes which app is leaking memory?
• Why the server went out of memory?
• Oh noes my app crashed!
• Where are my damn logs?
• How do I organize my micro service app?
• …. …. …. ….

6. Production application toolbox
with a Built-in load balancer
that Guarantees Uptime
and help you manage your processes

7. App #1
App #2
App #3
App #4
App #1
App #3 App #4
CL1 CL2
CL3 CL4
Disorganized
application & workflow
Structured
application & workflow
To
Before After

8. App #1
App #3 App #4
UsabilityCPU
Memory
Log
DeploymentModules
CL1 CL2
CL3 CL4
Ressources
management
and
optimization
Easier
software
management
Extend
capabilities

9. PM2: Some figures
• 10.000+ stars on GitHub
• 2.000.000+ downloads
• 2500+ commits
• 120+ contributors
• 750+ tests

10. 100+ contributors
Thank you all!!

12. Installation

13. Installing PM2
$ npm install pm2 -g
Source code:
https://github.com/Unitech/pm2
Documentation:
http://pm2.keymetrics.io

14. Setup PM2
No setup required! But…
$ pm2 completion install
Enabling autocompletion:
$ pm2 startup
Respawning PM2 on server boot:
http://pm2.keymetrics.io/docs/usage/quick-start/

15. Launching apps

16. Launching a Node.js application
$ pm2 start app.js
Put application in background
Handle logs
Monitor
Auto respawn application

17. Launching any kind of application
$ pm2 start app.py —interpreter="python3"
$ pm2 start script.sh
Starting a bash script:
Starting a Python app & set interpreter
http://pm2.keymetrics.io/docs/usage/process-management/

18. Acting on processes
$ pm2 delete <app-name|app-id|'all'>
$ pm2 restart <app-name|app-id|'all'>
Restart:
Delete:
$ pm2 stop <app-name|app-id|'all'>
Stop:
http://pm2.keymetrics.io/docs/usage/process-management/

19. Cluster mode

20. Most Node.js application…

21. Why using the cluster mode?
Intel® Xeon® Processor E5-1410 v2 - 8 cores

22. Starting an application cluster mode
$ pm2 start app.js -i <instances>
http://pm2.keymetrics.io/docs/usage/cluster-mode/

23. Managing clustered applications
$ pm2 gracefulReload <app-name|'all'>
$ pm2 reload <app-name|'all'>
Reload without downtime:
Graceful Reload (send signal to process):
$ pm2 scale <app-name> <instances>
Scale up/down process number:
http://pm2.keymetrics.io/docs/usage/cluster-mode/

24. Inspecting applications

25. $ pm2 list
Listing processes

26. $ pm2 monit
Monitoring CPU & Memory

27. $ pm2 show <app-name|id>
More informations

28. Inspecting logs
$ pm2 flush
$ pm2 logs [app-name]
Display logs in realtime:
Flushing logs:
$ pm2 reloadLogs
Reloading logs (logrotate):
http://pm2.keymetrics.io/docs/usage/log-management/

29. Organizing applications

30. Starting your micro service app…
$ DEBUG=“*” NODE_ENV="production" pm2 start app-1.js —
name “API” -i 8 —watch —max-memory-restart=“300M” — -a 23
$ DEBUG=“app2:*” NODE_ENV=“production" pm2 start
app-2.js —name “WORKER" —watch — -a prod
$ DEBUG=“app3:*” NODE_ENV=“production" pm2 start
app-3.js —name “BDD" —watch — -a malo

31. UGLY

32. Solution: JSON declaration
Application 1 (API)
Application 2 (Worker)
Application 3 (Crawler)
ecosystem.json

33. Using the JSON declaration
$ pm2 restart ecosystem.json
$ pm2 start ecosystem.json
Start:
Restart:
$ pm2 stop <app-name|app-id|'all'>
Stop:
http://pm2.keymetrics.io/docs/usage/application-declaration/

34. Deployment system

35. Extending the previous JSONecosystem.json
Production env
Staging env
Multi host

36. Deployment commands
$ pm2 deploy ecosystem.json production
$ pm2 deploy ecosystem.json production setup
Setup remote server:
Update remote application:
Revert to the n-th deployment:
$ pm2 deploy ecosystem.json production revert [n]
http://pm2.keymetrics.io/docs/usage/deployment/

37. Modules

38. What is a module?
An app that extend PM2 capabilities
or
A worker process providing an API
or
A totally independant software

39. Installing a module
$ pm2 install <module-name>
It gets the module from NPM
then Start it
and Keep it alive forever
http://docs.keymetrics.io/docs/usage/building-module/

40. Managing modules
$ pm2 uninstall <module-name>
$ pm2 install <module-name>
Install a module:
Uninstall:
$ pm2 set <module-name>:<attr> <value>
Set configuration option:
http://docs.keymetrics.io/docs/usage/building-module/

41. Some modules

42. Module #1: pm2-logrotate
$ pm2 install pm2-logrotate
Automatically rotate all logs of applications
managed by pm2
https://github.com/pm2-hive/pm2-logrotate

43. Module #2: pm2-webshell
$ pm2 install pm2-webshell
Expose a fully capable terminal in your browser
https://github.com/pm2-hive/pm2-webshell

44. Module #2: pm2-webshell
Termcaps capable
Backed by TTY.js
HTTPS support
Pass/User configurable
Port

45. Module #x: pm2-technology

46. Module #x: pm2-technology

47. Writing your own module
$ pm2 module:generate sample-module
Create a sample module:
Documentation:
Google -> pm2 module system
Official modules repositories:
http://github.com/pm2-hive/

48. Thank you!
alexandre@keymetrics.io
github.com/Unitech
@strzel_a