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fix: cap cluster worker count via IFRAMELY_WORKERS_COUNT (OOMKilled on large nodes) #4

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Merged
pratapalakshmi merged 1 commit into from
Jun 8, 2026
Merged

fix: cap cluster worker count via IFRAMELY_WORKERS_COUNT (OOMKilled on large nodes) #4

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5 changes: 5 additions & 0 deletions cluster.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,11 @@ process.title = 'iframely-cluster';

GracefulCluster.start({
log: sysUtils.log,
// When undefined, graceful-cluster falls back to os.cpus().length, which is
// the HOST node's vCPU count and ignores the container's CPU limit — forking
// far too many workers on large nodes (each loads ~1886 domains + Redis +
// Secrets Manager). Cap it via IFRAMELY_WORKERS_COUNT (see config.loader.js).
workersCount: CONFIG.CLUSTER_WORKERS_COUNT,
shutdownTimeout: CONFIG.SHUTDOWN_TIMEOUT,
disableGraceful: CONFIG.DEBUG,
restartOnTimeout: CONFIG.CLUSTER_WORKER_RESTART_ON_PERIOD,
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13 changes: 13 additions & 0 deletions config.loader.js
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Expand Up @@ -33,6 +33,8 @@ globalConfig = globalConfig && globalConfig.default;
// REDIS_PORT_KEY JSON key for port (default: REDIS_PORT)
//
// Cluster worker tuning
// IFRAMELY_WORKERS_COUNT number of cluster workers (default: os.cpus().length)
// alias: IFRAMELY_WORKERS
// IFRAMELY_WORKER_MAX_MEMORY_MB per-worker memory before restart, MB (default: 120)
// IFRAMELY_WORKER_RESTART_PERIOD_SEC periodic worker restart interval, seconds (default: 28800)
// ---------------------------------------------------------------------------
Expand Down Expand Up @@ -113,4 +115,15 @@ if (process.env.IFRAMELY_WORKER_RESTART_PERIOD_SEC) {
}
}

// Number of cluster workers. Without this, graceful-cluster uses os.cpus().length
// (the HOST node's vCPU count), which on large nodes forks far more workers than
// the container's CPU/memory can sustain -> OOMKilled. IFRAMELY_WORKERS is
// accepted as an alias.
if (process.env.IFRAMELY_WORKERS_COUNT || process.env.IFRAMELY_WORKERS) {
var workersCount = parseInt(process.env.IFRAMELY_WORKERS_COUNT || process.env.IFRAMELY_WORKERS, 10);
if (!isNaN(workersCount) && workersCount > 0) {
envOverrides.CLUSTER_WORKERS_COUNT = workersCount;
}
}

export default {...iframelyConfig, ...globalConfig, ...envOverrides};