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PM2 manages process lifecycles by automatically restarting applications that exit with non-zero codes. While features like exp-backoff-restart-delay and max_restarts control the frequency and limit of these attempts, the process manager operates independently of the application's internal state. When a process crashes during a write operation, PM2 triggers a
Goal is to deploy a KrakenJS application to production while preserving its configuration-driven environment isolation and strict folder structure loading. KrakenJS provides a built-in CLI for scaffolding and deployment that automates production-ready configurations. An alternative is manual process management with an external process manager for granular he
Goal Reduce hosting costs by allowing a Node.js application managed by PM2 to automatically stop all instances when traffic drops to zero. Current Constraint PM2 lacks a built‑in mechanism to trigger a stop after a configurable period of inactivity. Users must rely on external scripts that monitor request rates and invoke pm2 stop or pm2 delete . Uncertainty
In environments with low-traffic workloads, reducing the memory footprint of uWSGI is a priority. The cheaper subsystem allows the server to scale down the number of worker processes when demand is low, rather than maintaining a static pre-fork model defined by the processes directive. While the busyness algorithm provides a mechanism for dynamic scaling, th
Process Management and Socket Persistence In production environments, uWSGI is frequently configured with the master and vacuum options to ensure worker lifecycle management and the removal of Unix sockets upon termination. While these settings function predictably during manual restarts in local development, production deployments often rely on signal-based
Automatic Restart Behavior and Idempotency PM2 is configured to automatically restart Node.js processes that exit with a non-zero code. Because this mechanism re-executes the entry point script without preserving in-memory state, applications performing asynchronous write operations may face challenges regarding data duplication. If a process crashes after a
When establishing a repeatable development environment using an ecosystem.config.js file, PM2 allows the definition of multiple environment blocks, such as env and env_production , to manage configuration across different stages. There is uncertainty regarding the resolution order when a specific environment is invoked via the --env flag while the host syste
PM2's upgrade mechanism replaces the running daemon and attempts to restore processes from a saved dump file. When the installed PM2 version changes, the dump format and process metadata may become incompatible, causing pm2 resurrect code to fail silently or partially. Boot-time resurrection via pm2 startup code can also reference a stale PM2 binary path, re
Graceful Process Migration in Perl When migrating or updating a small Perl application deployed via a PSGI interface, the goal is to replace the running process without dropping active connections. While pre-forking servers like Starman support signal-based management, the interaction between the master process and worker children during a reload can introdu
pm2
nodejs
krakenjs
uwsgi
perl