Docker容器资源监控的终极指南

docker stats --no-stream [容器名]

CONTAINER   CPU %   MEM USAGE / LIMIT   MEM %   NET I/O       BLOCK I/O   PIDS
nginx       0.12%   35.8MiB / 1.944GiB   1.8%   1.2kB / 0B    0B / 0B     3
mysql       45.7%   1.2GiB / 2GiB       60.0%   15.4MB/3.2MB  2.1GB/0B    28

docker top mysql_container -o pid,ppid,user,cmd,%cpu,%mem

PID   PPID  USER   CMD          CPU% MEM%
6723  6718  mysql mysqld        24.3 18.7
6789  6723  mysql mysqld_safe   0.2  0.5

docker system df -v

TYPE        ACTIVE    RECLAIMABLE
Images      5         1.2GB (35%)
Containers  8         350MB (22%)
Volumes     3         800MB (61%)

# 启动cAdvisor
docker run -d \
  --volume=/:/rootfs:ro \
  --volume=/var/run:/var/run:ro \
  --publish=8080:8080 \
  --name=cadvisor \
  google/cadvisor:v0.47.0

# Prometheus配置示例
scrape_configs:
  - job_name: cadvisor
    static_configs:
      - targets: ['cadvisor:8080']

# 监控RSS内存增长
watch -n 5 "docker stats --no-stream --format '{{.Name}} {{.MemUsage}}'"

# 生成内存快照（Java示例）
docker exec my_app jcmd 1 GC.heap_dump /tmp/dump.hprof

# 查看容器网络接口
docker exec -it nginx ip addr show eth0

# 抓取容器网络包
docker run --net container:nginx -it nicolaka/netshoot tcpdump -i eth0

docker run -d --cpus=2 --memory=1g --memory-swap=0 nginx

# Prometheus Alertmanager配置示例
- alert: HighMemoryUsage
  expr: container_memory_usage_bytes / container_spec_memory_limit_bytes > 0.9
  for: 5m

docker run -d --cap-add SYS_PTRACE \
  -p 19999:19999 \
  netdata/netdata

docker run -d --volume=/var/run/docker.sock:/var/run/docker.sock \
  -p 8080:8080 \
  amir20/dozzle