3个cn + 3个fe
cn日志：
W0821 05:54:10.596781 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=557: Connection timed out [110]
W0821 05:54:14.097034 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=622: Connection timed out [110]
W0821 05:54:17.597894 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=694: Connection timed out [110]
W0821 05:54:21.098115 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=932: Connection timed out [110]
W0821 05:54:24.598351 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=319: Connection timed out [110]
W0821 05:54:28.099249 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=946: Connection timed out [110]
W0821 05:54:31.599743 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=954: Connection timed out [110]
W0821 05:54:35.100033 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=456: Connection timed out [110]
W0821 05:54:38.602664 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=961: Connection timed out [110]
W0821 05:54:42.102962 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=969: Connection timed out [110]
W0821 05:54:45.603271 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=975: Connection timed out [110]
W0821 05:54:49.103518 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=981: Connection timed out [110]
W0821 05:54:52.604295 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=989: Connection timed out [110]
W0821 05:54:56.104511 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=505: Connection timed out [110]
W0821 05:54:59.605276 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=586: Connection timed out [110]
W0821 05:55:03.105504 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=636: Connection timed out [110]
W0821 05:55:06.606009 799 socket.cpp:1227] Fail to wait EPOLLOUT of fd=732: Connection timed out [110]
W0821 05:55:10.106889 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=934: Connection timed out [110]
W0821 05:55:13.607141 759 socket.cpp:1227] Fail to wait EPOLLOUT of fd=457: Connection timed out [110]
cn时不时会自动重启