1) 檢查當(dāng)前僵尸進程信息
# ps -ef | grep defunct | grep -v grep | wc -l
175
# top | head -2
top - 15:05:54 up 97 days, 23:49,? 4 users,? load average: 0.66, 0.45, 0.39
Tasks: 829 total,?? 1 running, 479 sleeping, 174 stopped, 175 zombie
# ps -ef | grep defunct | grep -v grep
2) 獲得殺僵尸進程語句
# ps -ef | grep defunct | grep -v grep | awk '{print "kill -9 " $2,$3}'
執(zhí)行上面獲得的語句即可, 使用信號量9, 僵尸進程數(shù)會大大減少.
3) 過一會兒檢查當(dāng)前僵尸進程信息
# ps -ef | grep defunct | grep -v grep | wc -l
125
# top | head -2
top - 15:29:26 up 98 days, 12 min,? 7 users,? load average: 0.27, 0.54, 0.56
Tasks: 632 total,?? 1 running, 381 sleeping, 125 stopped, 125 zombie
發(fā)現(xiàn)僵尸進程數(shù)減少了一些, 但還有不少啊.
4) 再次獲得殺僵尸進程語句
# ps -ef | grep defunct | grep -v grep | awk '{print "kill -18 " $3}'
執(zhí)行上面獲得的語句即可, 這次使用信號量18殺其父進程, 僵尸進程應(yīng)該會全部消失.
5) 過一會兒再檢查當(dāng)前僵尸進程信息
# ps -ef | grep defunct | grep -v grep | wc -l
0
# top | head -2
top - 15:39:46 up 98 days, 23 min,? 7 users,? load average: 5.46, 2.20, 1.12
Tasks: 134 total,?? 1 running, 133 sleeping,?? 0 stopped,?? 0 zombie
6) 清除ZOMBIE(僵尸)進程原理
# kill -18 PPID
PPID是其父進程, 這個信號是告訴父進程, 該子進程已經(jīng)死亡了, 請收回分配給他的資源. 如果還不行則看先看其父進程又無其他子進程, 如果有, 可能需要先kill其他子進程, 也就是兄弟進程.
方法是:
# kill -15 PID1 PID2
PID1,PID2是僵尸進程的父進程的其它子進程.
然后再kill父進程:
# kill -15 PPID