monitor-resources.sh

#!/bin/bash
# Monitor container resource usage

CONTAINER_ID=$1
CGROUP_PATH="/sys/fs/cgroup"

while true; do
    echo "=== Resource Usage for ${CONTAINER_ID} ==="
    echo "Timestamp: $(date)"

    # Memory usage
    MEMORY_USED=$(cat ${CGROUP_PATH}/memory/sandbox/container_${CONTAINER_ID}/memory.usage_in_bytes)
    MEMORY_LIMIT=$(cat ${CGROUP_PATH}/memory/sandbox/container_${CONTAINER_ID}/memory.limit_in_bytes)
    MEMORY_PCT=$((MEMORY_USED * 100 / MEMORY_LIMIT))
    echo "Memory: ${MEMORY_USED} / ${MEMORY_LIMIT} (${MEMORY_PCT}%)"

    # CPU usage
    CPU_USAGE=$(cat ${CGROUP_PATH}/cpuacct/sandbox/container_${CONTAINER_ID}/cpuacct.usage)
    echo "CPU Usage (nanoseconds): ${CPU_USAGE}"

    # PID count
    PID_CURRENT=$(cat ${CGROUP_PATH}/pids/sandbox/container_${CONTAINER_ID}/pids.current)
    PID_MAX=$(cat ${CGROUP_PATH}/pids/sandbox/container_${CONTAINER_ID}/pids.max)
    echo "PIDs: ${PID_CURRENT} / ${PID_MAX}"

    # Check for OOM
    OOM_COUNT=$(cat ${CGROUP_PATH}/memory/sandbox/container_${CONTAINER_ID}/memory.oom_control | grep "oom_kill" | awk '{print $2}')
    if [ "$OOM_COUNT" != "0" ]; then
        echo "[WARNING] OOM KILLS: ${OOM_COUNT}"
    fi

    echo ""
    sleep 5
done