问题排查及解决
在整合fastdfs+nginx的时候，我按照教程配置好了nginx.conf文件，拷贝并配置好mod_fastdfs.conf文件以及拷贝了http.conf和mime.types文件后(配置教程网上很多，可以自己搜一下)，按理说我的nginx应该可以正常启动了，但我的worker还是启动失败了，问题如下：
启动nginx后，通过
ps -aux | grep nginx查看nginx是否正常启动，显示信息如下：1
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3root 2771 0.0 0.1 32596 2508 ? Ss 14:43 0:00 nginx: master process ./nginx
nobody 2776 0.0 0.1 33444 3608 ? S 14:43 0:00 nginx: master process ./nginx
ccy 2778 0.0 0.0 15984 968 pts/4 S+ 14:43 0:00 grep --color=auto nginx可以看到worker并没有启动起来，反而多了一个nobody启动的master,而且它的进程号还会一直变。
既然出错了就去查看日志信息，在logs/error.log中看到如下信息：
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162020/08/21 14:46:48 [alert] 2771#0: worker process 2934 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2936
2020/08/21 14:46:51 [alert] 2771#0: worker process 2936 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2938
2020/08/21 14:46:54 [alert] 2771#0: worker process 2938 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2940
2020/08/21 14:46:57 [alert] 2771#0: worker process 2940 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2944
2020/08/21 14:47:00 [alert] 2771#0: worker process 2944 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2946
2020/08/21 14:47:03 [alert] 2771#0: worker process 2946 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2948
2020/08/21 14:47:06 [alert] 2771#0: worker process 2948 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2950
2020/08/21 14:47:09 [alert] 2771#0: worker process 2950 exited on signal 11 (core dumped)
ngx_http_fastdfs_process_init pid=2953反正就是循环打印这些信息，进程号不断变化的原因就是进程启动出错并退出了，于是master进程很快就重新启动了新的worker进程，如此循环。
于是我又用
dmesg|grep nginx查看了一下错误信息，显示：1
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7[ 1265.795384] nginx[3250]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1268.880476] nginx[3256]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1271.938227] nginx[3258]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1275.014353] nginx[3260]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1278.123135] nginx[3264]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1281.200925] nginx[3266]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]
[ 1284.280982] nginx[3268]: segfault at 4 ip 00007feab5165416 sp 00007fff258a0780 error 4 in libfdfsclient.so[7feab515e000+1a000]其中提到了libfdfsclient.so，我就突然想到了一开始配置的mod_fastdfs.conf文件中我是有配置到tracker的IP和端口的，会不会是因为我的fastdfs的tracker没开啊，打开一下试试，
fdfs_trackerd /etc/fdfs/tracker.conf start，
然后sudo ./nginx -s stop退出刚刚出错的nginx，
再启动nginx，sudo ./nginx，然后ps -aux | grep nginx，打印如下：1
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3root 3373 0.0 0.0 32596 460 ? Ss 14:56 0:00 nginx: master process ./nginx
nobody 3374 0.0 0.1 33444 3620 ? S 14:56 0:00 nginx: worker process
ccy 3377 0.0 0.0 15984 1028 pts/4 R+ 14:56 0:00 grep --color=auto nginx可以看到，worker启动起来了，配置成功了！
