Container Performance Monitoring

Beginner5 min

Monitor CPU, memory, network, and I/O usage of running containers to identify performance bottlenecks.

Prerequisites

-Docker installed
-Running containers

Steps

View real-time stats for all containers

Monitor resource usage across all running containers.

$ docker stats

Get a single snapshot of stats

Capture a one-time snapshot without streaming for scripts and logging.

$ docker stats --no-stream --format 'table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.MemPerc}}\t{{.NetIO}}\t{{.BlockIO}}'

Inspect container resource limits

Check what resource limits are set for a container.

$ docker inspect <container-name> --format '{{.HostConfig.Memory}} {{.HostConfig.CpuQuota}}'

Memory is in bytes. Divide by 1048576 to get MB. CpuQuota of 100000 = 1 CPU core.

Full Script

full-script.sh

#!/bin/bash
# Container Performance Monitoring
set -euo pipefail

echo "=== Container Resource Usage ==="
docker stats --no-stream --format 'table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.MemPerc}}\t{{.NetIO}}\t{{.BlockIO}}'

echo ""
echo "=== Container Uptime ==="
docker ps --format 'table {{.Names}}\t{{.Status}}\t{{.RunningFor}}'

FAQ

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