来源：在nginx跑着的时候手贱把配置文件盖了，我想既然nginx既没重启也没重新读配置，所以肯定有什么办法dump出来当前正在用的配置文件。
然后搜了下搜到一个直接用gdb读内存的法子，来源https://serverfault.com/questions/361421/dump-nginx-config-from-running-process
# Set pid of nginx master process here
pid=8192
# generate gdb commands from the process's memory mappings using awk
cat /proc/$pid/maps | awk '$6 !~ "^/" {split ($1,addrs,"-"); print "dump memory mem_" addrs[1] " 0x" addrs[1] " 0x" addrs[2] ;}END{print "quit"}' > gdb-commands
# use gdb with the -x option to dump these memory regions to mem_* files
gdb -p $pid -x gdb-commands
# look for some (any) nginx.conf text
grep worker_connections mem_*
grep server_name mem_*
改一下pid为主进程的pid即可，然后退出gdb，去mem_*文件里搜配置文件的关键字。