我的aws中的nginx服务器似乎崩溃，并显示以下消息，
2019/01/14 12:37:25 [notice] 18928#0: ModSecurity-nginx v1.0.0
2019/01/14 12:37:25 [notice] 18928#0: signal process started
2019/01/14 12:37:25 [notice] 1415#0: signal 15 (SIGTERM) received from 18928, exiting
2019/01/14 12:37:25 [notice] 1424#0: exiting
2019/01/14 12:37:25 [notice] 1423#0: exiting
2019/01/14 12:37:25 [notice] 1425#0: exiting
2019/01/14 12:37:25 [notice] 1426#0: exiting
2019/01/14 12:37:25 [notice] 1425#0: exit
2019/01/14 12:37:25 [notice] 1415#0: signal 17 (SIGCHLD) received from 1425
2019/01/14 12:37:25 [notice] 1415#0: worker process 1425 exited with code 0
2019/01/14 12:37:25 [notice] 1415#0: signal 29 (SIGIO) received
2019/01/14 12:37:25 [notice] 1424#0: exit
2019/01/14 12:37:25 [notice] 1415#0: signal 17 (SIGCHLD) received from 1424
2019/01/14 12:37:25 [notice] 1415#0: worker process 1424 exited with code 0
2019/01/14 12:37:25 [notice] 1415#0: signal 29 (SIGIO) received
2019/01/14 12:37:25 [notice] 1426#0: exit
2019/01/14 12:37:25 [notice] 1415#0: signal 17 (SIGCHLD) received from 1426
2019/01/14 12:37:25 [notice] 1415#0: worker process 1426 exited with code 0
2019/01/14 12:37:25 [notice] 1415#0: signal 29 (SIGIO) received
2019/01/14 12:37:25 [notice] 1423#0: exit
2019/01/14 12:37:25 [notice] 1415#0: signal 17 (SIGCHLD) received from 1423
2019/01/14 12:37:25 [notice] 1415#0: worker process 1423 exited with code 0
2019/01/14 12:37:25 [notice] 1415#0: exit
我不知道为什么！