Linux 如何杀死僵尸进程

问题描述：

shell > top
top - :: up  days, :,   user,  load average: 0.23, 0.81, 1.07
Tasks:  total,    running,  sleeping,    stopped,    zombie
Cpu(s):  3.6%us,  0.8%sy,  0.0%ni, 95.3%id,  0.0%wa,  0.0%hi,  0.3%si,  0.0%st
Mem:  24596748k total,  3346824k used, 21249924k free,    50344k buffers
Swap:  8388600k total,     9704k used,  8378896k free,  1649016k cached

# 发现有三个僵尸进程 3 zombie ，这是因为先杀死了父进程导致

shell > ps aux | grep Z
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root        0.0  0.0            ?        Zs   :   : [yiic_elastic_kt] <defunct>
root        0.0  0.0     pts/    R+   :   : grep Z

# 不给面子，已经自动死了两个，估计是太阳出来了

shell > kill - 

# 这样是杀不死的，还顽强的存活着

解决方法：

shell > ps -ef | grep defunct
root           : ?        :: [yiic_elastic_kt] <defunct>
root           : ?        :: [yiic_elastic_kt] <defunct>
root           : ?        :: [yiic_elastic_kt] <defunct>
root           : ?        :: [yiic_elastic_kt] <defunct>
root           : pts/    :: grep defunct

# 我去，又跑出来三个...

shell > ps -ef | grep defunct | awk '{print $3}' | xargs -i kill {}

# $3 是这些僵尸进程的父进程 PID ( PPID )，杀之！

shell > ps -ef | grep defunct
root          : pts/    :: grep defunct

# 已经灰飞烟灭！