liunx启动mongodb报错 mongodb child process failed, exited with error number 14

mongodb启动报错：mongodb child process failed, exited with error number 14，查看mongodb.cnf日志，发现其中有一条：Too many open files at src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp 79。

设置ulimit -n 10000。完美！