k8s集群根据进程PID获取Pod名称
简单说明
在实际的应用场景中，我们如果看到某个进程资源或服务异常，需要根据这个进程排查到底是哪个服务的Pod，这里我们介绍一种根据PID快速寻找Pod名称的方法。
实际操作
查看进程PID
这里我们以GPU任务为例说明，可以看到占用显卡的任务PID为8241
[root@centos ~]# nvidia-smi
Thu Jun 15 11:34:39 2023
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 4xx.xx.xx Driver Version: 4xx.xx.xx CUDA Version: xx.x |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 A100-SXM4-40GB On | 00000000:26:00.0 Off | 0 |
| N/A 30C P0 65W / 400W | 6474MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 1 A100-SXM4-40GB On | 00000000:2C:00.0 Off | 0 |
| N/A 30C P0 55W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 2 A100-SXM4-40GB On | 00000000:65:00.0 Off | 0 |
| N/A 29C P0 53W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 3 A100-SXM4-40GB On | 00000000:6A:00.0 Off | 0 |
| N/A 29C P0 52W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 4 A100-SXM4-40GB On | 00000000:A2:00.0 Off | 0 |
| N/A 28C P0 55W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 5 A100-SXM4-40GB On | 00000000:A7:00.0 Off | 0 |
| N/A 29C P0 52W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 6 A100-SXM4-40GB On | 00000000:E1:00.0 Off | 0 |
| N/A 30C P0 53W / 400W | 0MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
| 7 A100-SXM4-40GB On | 00000000:E7:00.0 Off | 0 |
| N/A 28C P0 55W / 400W | 3MiB / 40536MiB | 0% Default |
| | | Disabled |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 8241 C python 6471MiB |
+-----------------------------------------------------------------------------+
根据PID查看容器ID
[root@centos ~]# cat /proc/8241/cgroup
11:hugetlb:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
10:memory:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
9:blkio:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
8:freezer:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
7:perf_event:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
6:net_prio,net_cls:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
5:pids:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
4:cpuset:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
3:devices:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
2:cpuacct,cpu:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
1:name=systemd:/kubepods/burstable/pod6bb2e0f4-1f90-4699-b397-d24a617ceaad/2d680a961895ee47f4b1aeca3965766480752d906d208c746d599e202391f89c
# 可以看到进程对应的容器ID为2d680a961....，这里太长了，我们只截取一部分
[root@centos ~]# cat /proc/8241/cgroup |awk -F '/' '{print $5}' |head -n 1 |cut -b 1-8
2d680a96
根据容器的PID查看Pod名称
[root@centos ~]# crictl inspect -o go-template --template='{{index .status.labels "io.kubernetes.pod.name"}}' 2d680a96
gputask-64c5557974-kff4j
