How Linux servers Find and kill zombie processes

First, we can use the top command to see whether the server currently has a zombie process, in the following figure can see the number of zombie processes, if the number is greater than 0, it means that the server currently has a zombie process

Below, we use the PS and grep commands to find the zombie process

Ps-a-ostat,ppid,pid,cmd | Grep-e ' ^[zz] '

command annotation:

-A parameter lists all processes

-O Custom output fields We set the Display field stat (state), PPID (process parent ID), PID (process id), cmd (command) These four parameters

Because the process of a state of Z or Z is a zombie process, we use grep to crawl the stat state for the ZZ process

The results of the operation refer to the following

Z 12334 12339/path/cmd

At this point, we can use kill-hup 12339来 to kill this zombie process.

After running, you can run Ps-a-ostat,ppid,pid,cmd again | Grep-e ' ^[zz] ' to confirm the killing of the zombie process

If the kill child process is invalid, you can try to kill its parent process to resolve the problem, for example, the parent process PID is 12334 above, so we run

Kill-hup 12334

To solve the problem

June 9, 2014 add

Check current zombie Process information

Ps-ef | grep defunct | Grep-v grep | Wc-l

View top two lines of information

Top | Head-2

Kill the process directly.

Ps-ef | grep defunct | Grep-v grep | awk ' {print ' kill-18 ' $} '