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13
votes
3answers
2k views

Link to a specific inode

I have a file that was deleted, but is still held open by a program. I found the inode number using lsof. How can I create a hard link back to that inode?
6
votes
4answers
18k views

Running lsof -i shows a lot of connections in CLOSE_WAIT ? Should I worry

So I am running lsof -i | wc -l periodically and it is telling me that out of 420 lines, between 240 and 255 are in CLOSE_WAIT state. How does TCP connections enter this state ? Should I be worried ...
6
votes
1answer
9k views

How can I observe what nginx is doing? (to solve: “1024 worker_connections are not enough”)

I have a very low traffic site running on nginx, with 4 workers, 1024 connections each. Every several hours I start seeing in the error log "1024 worker_connections are not enough", and my site slows ...
5
votes
1answer
721 views

Why is rpc.lockd obscured from netstat/lsof output?

Prologue: On a number of machines, which happen to act as NFS clients, netstat reports two ports that are open with no PID listed for an associated daemon. Ordinarily this might be a bit concerning. ...
3
votes
1answer
3k views

What's the difference between `lsof -p <pid> | wc -l` and `ls /proc/<pid>/fd | wc -l`?

Background: I'm playing around with monitoring the ulimit for running processes for a particular user. (I had occasionally seen processes that were getting started with an incorrect limit.) I asked a ...