如果一个pod在被销毁时其pvc挂载节点无法解挂会导致pod一直处于Terminating状态无法删除，出现这种情况时在系统/var/log/messages搜索pod 的uid能找到到umount对应pvc报Resouce busy。
#kubectl get pods $podname -n $namespace -o yaml | grep uid
uid: b943671a-fd85-4687-84f5-c88e49a0339a
通过uid搜索/var/log/messages日志可以看到类似如下报错信息：
umount: can't unmount /var/lib/kubelet/pods/b943671a-fd85-4687-84f5-c88e49a0339a/volumes/kubernetes.io~csi/test-pv/mount: Resource busyn"
此时手工去umount该挂载点也会报device is busy解挂失败：
# umount /var/lib/kubelet/pods/b943671a-fd85-4687-84f5-c88e49a0339a/volumes/kubernetes.io~csi/test-pv/mount
umount.nfs4: /var/lib/kubelet/pods/b943671a-fd85-4687-84f5-c88e49a0339a/volumes/kubernetes.io~csi/test-pv/mount: device is busy
由于使用lsof D的方式会输出较多的干扰信息，这个时候可以使用如下脚本来快速找到是什么进程访问了该挂载点，其原理是通过遍历/proc/下所有进程的fd找到对应匹配的描述符信息
代码语言：javascript复制#!/bin/bash
if [[ -z "$1" ]]; then
echo "Usage: $0 <search_string>"
exit 1
fi
search_string="$1"
for pid in /proc/[0-9]*; do
if [[ -e "$pid" ]]; then
result=$(ls -al "$pid/fd" 2>/dev/null | grep "$search_string")
if [[ -n "$result" ]]; then
process_name=$(cat "$pid/comm" 2>/dev/null)
echo "PID: $(basename $pid) - Process Name: $process_name"
fi
fi
done拷贝脚本到节点上运行，输入参数是待解挂的挂载点路径名字符串(这里是b943671a-fd85-4687-84f5-c88e49a0339a)
代码语言：javascript复制# ./find_pid.sh b943671a-fd85-4687-84f5-c88e49a0339a
PID: 2499756 - Process Name: loglistener如果容器内的进程还存在，还可以通过pid的cgroup找到该进程对应的容器ID以及对应的pod：
代码语言：javascript复制# cat /proc/2499756/cgroup | grep pids
8:pids:/kubepods/burstable/pod3afd6ff6-5151-4afa-b62c-e58d4bc35413/83a9e3006ac35e8c19bc4d98b373f9224fcfbf445b7809c8646e040a3f27f676
# docker ps | grep 83a9e300
83a9e3006ac3 hkccr.ccs.tencentyun.com/images/test-pod "/docker-entrypoint.…" 31 hours ago Up 31 hours k8s_test-pod-xp6vw_kube-system_3afd6ff6-5151-4afa-b62c-e58d4bc35413_0
# docker inspect 83a9e3006ac3 | grep -i pid
"Pid": 2499756, 进入容器同样可以查看：
代码语言：javascript复制进入容器
#docker exec -ti 83a9e3006ac3 bash
容器镜像如果没有lsof命令同样可以通过查看进程的fd找到其打开的文件路径
# ls /proc/1/fd -al | grep b943671a-fd85-4687-84f5-c88e49a0339a
lr-x------ 1 root root 64 Nov 21 15:39 17 -> /rootfs/var/lib/kubelet/pods/b943671a-fd85-4687-84f5-c88e49a0339a/volumes/kubernetes.io~csi/test-pv/mount/log/test.log
