https://access.redhat.com/solutions/737033
环境
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
问题
- Server unexpected reboot.
- System is getting rebooted with 'Signal 15' :
shutdown: shutting down for system reboot
init: Switching to runlevel: 6
[...]
exiting on signal 15
syslogd 1.4.1: restart.
syslog: syslogd startup succeeded
- What is this signal 15 ?
决议
Signal 15 is a SIGTERM (see "kill -l" for a complete list). It's the way most programs are gracefully terminated, and is relatively normal
behaviour.This indicates system has delivered a SIGTERM to the processes. This is usually at the request of some other process (via kill()) but could also be sent by your process to itself (using raise()). This signal requests an orderly shutdown of process or system itself.
$ kill -l
1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP
6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1
11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM
16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP
21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ
26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO 30) SIGPWR
31) SIGSYS 34) SIGRTMIN 35) SIGRTMIN+1 36) SIGRTMIN+2 37) SIGRTMIN+3
38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8
43) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
58) SIGRTMAX-6 59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2
63) SIGRTMAX-1 64) SIGRTMAX
- The real question is "Who/what is sending the SIGTERM?", Please refer the below mentioned articles for the same.
How to find which user has rebooted the system?
How to find out who sent the 'signal-15' ?

博客围绕Red Hat Enterprise Linux 5和6系统展开,指出系统出现意外重启,收到'Signal 15'信号。解释Signal 15即SIGTERM,是程序正常终止方式,通常由其他进程请求或自身发送,用于有序关闭进程或系统,还提及需查找发送SIGTERM的主体。
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