nginx + fastcgi + Django 经常504

Question

网站访问量非常小，之前有段时间是每周末结束回来就会出现 504错误，重启fastcgi 就OK，后来频率变得越来越高，从一周变成一天，到半天，但是中间代码没有什么大的变动，感觉很奇怪。
在服务器上运行 netstat 命令得到的结果如下 ：
不知道大家遇到这类问题是一般是怎么去调试呢？还有Active UNIX domain sockets (w/o servers)
这个下面这对东西有没有问题？

$ netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
tcp        0      0 localhost:9099              localhost:45614             SYN_RECV    
tcp        0      0 localhost:9099              localhost:45615             SYN_RECV    
tcp        0      0 localhost:9099              localhost:45613             SYN_RECV    
tcp        0      0 localhost:9099              localhost:45612             SYN_RECV    
tcp        0      0 localhost:9099              localhost:45616             SYN_RECV    
tcp      513      0 localhost:9099              localhost:44474             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44375             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44423             CLOSE_WAIT  
tcp      457      0 localhost:9099              localhost:44365             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44517             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44346             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44378             CLOSE_WAIT  
tcp        0    521 localhost:45614             localhost:9099              FIN_WAIT1   
tcp      505      0 localhost:9099              localhost:44399             CLOSE_WAIT  
tcp        0    561 localhost:45615             localhost:9099              FIN_WAIT1   
tcp      625      0 localhost:9099              localhost:44337             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44402             CLOSE_WAIT  
tcp      561      0 localhost:9099              localhost:44425             CLOSE_WAIT  
tcp      673      0 localhost:9099              localhost:44409             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44416             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44508             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44433             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44442             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44405             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44341             CLOSE_WAIT  
tcp      657      0 localhost:9099              localhost:44503             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44336             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44489             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44382             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44397             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44370             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44521             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44340             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44494             CLOSE_WAIT  
tcp      441      0 localhost:9099              localhost:44478             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44391             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44495             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44332             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44473             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44470             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44468             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44424             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44447             CLOSE_WAIT  
tcp      473      0 localhost:9099              localhost:44361             CLOSE_WAIT  
tcp      473      0 localhost:9099              localhost:44484             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44412             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44383             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44355             CLOSE_WAIT  
tcp      473      0 localhost:9099              localhost:44481             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44446             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44394             CLOSE_WAIT  
tcp      489      0 localhost:9099              localhost:44324             CLOSE_WAIT  
tcp      545      0 localhost:9099              localhost:44400             CLOSE_WAIT  
tcp      481      0 localhost:9099              localhost:44487             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44418             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44457             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44438             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44502             CLOSE_WAIT  
tcp      681      0 localhost:9099              localhost:44344             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44486             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44323             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44362             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44327             CLOSE_WAIT  
tcp      457      0 localhost:9099              localhost:44522             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44513             CLOSE_WAIT  
tcp      569      0 localhost:9099              localhost:44458             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44437             CLOSE_WAIT  
tcp      569      0 localhost:9099              localhost:pmcd              CLOSE_WAIT  
tcp      489      0 localhost:9099              localhost:44462             CLOSE_WAIT  
tcp      569      0 localhost:9099              localhost:44328             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44485             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44430             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44434             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44453             CLOSE_WAIT  
tcp      481      0 localhost:9099              localhost:44519             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44480             CLOSE_WAIT  
tcp      681      0 localhost:9099              localhost:44401             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44334             CLOSE_WAIT  
tcp      481      0 localhost:9099              localhost:44482             CLOSE_WAIT  
tcp      673      0 localhost:9099              localhost:44455             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44428             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44518             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:pmcdproxy         CLOSE_WAIT  
tcp      489      0 localhost:9099              localhost:44498             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44467             CLOSE_WAIT  
tcp      433      0 localhost:9099              localhost:44477             CLOSE_WAIT  
tcp      457      0 localhost:9099              localhost:44363             CLOSE_WAIT  
tcp      681      0 localhost:9099              localhost:44451             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44385             CLOSE_WAIT  
tcp        0      0 xx.xx.xx.xx:http        crawl-66-249-76-235.g:36350 ESTABLISHED 
tcp      473      0 localhost:9099              localhost:44358             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44444             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44353             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44325             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44377             CLOSE_WAIT  
tcp      673      0 localhost:9099              localhost:44501             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44499             CLOSE_WAIT  
tcp        0      0 xx.xx.xx.xx:ssh         114.248.169.70:56609        ESTABLISHED 
tcp      689      0 localhost:9099              localhost:44516             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44364             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44359             CLOSE_WAIT  
tcp        0      0 xx.xx.xx.xx:ssh         114.248.169.70:57441        ESTABLISHED 
tcp      521      0 localhost:9099              localhost:44415             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44395             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44411             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44360             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44413             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44406             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44356             CLOSE_WAIT  
tcp      905      0 localhost:9099              localhost:44440             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44465             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44510             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44347             CLOSE_WAIT  
tcp      521      0 localhost:9099              localhost:44372             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44366             CLOSE_WAIT  
tcp      489      0 localhost:9099              localhost:44338             CLOSE_WAIT  
tcp      465      0 localhost:9099              localhost:44483             CLOSE_WAIT  
tcp      905      0 localhost:9099              localhost:44436             CLOSE_WAIT  
tcp      449      0 localhost:9099              localhost:44379             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44393             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44403             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44371             CLOSE_WAIT  
tcp      513      0 localhost:9099              localhost:44374             CLOSE_WAIT  
tcp      505      0 localhost:9099              localhost:44333             CLOSE_WAIT  
tcp      625      0 localhost:9099              localhost:44461             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44449             CLOSE_WAIT  
tcp      681      0 localhost:9099              localhost:44497             CLOSE_WAIT  
tcp      905      0 localhost:9099              localhost:44476             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44491             CLOSE_WAIT  
tcp        0    520 localhost:45616             localhost:9099              ESTABLISHED 
tcp      513      0 localhost:9099              localhost:44504             CLOSE_WAIT  
tcp      689      0 localhost:9099              localhost:44384             CLOSE_WAIT  
tcp      441      0 localhost:9099              localhost:44512             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44479             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44427             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44414             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44432             CLOSE_WAIT  
tcp      497      0 localhost:9099              localhost:44463             CLOSE_WAIT  
tcp      673      0 localhost:9099              localhost:44352             CLOSE_WAIT  
tcp      633      0 localhost:9099              localhost:44396             CLOSE_WAIT  
tcp        0   4860 xx.xx.xx.xx:ssh         123.120.30.5:38913          ESTABLISHED 
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ]         DGRAM                    609897 @/org/kernel/udev/udevd
unix  2      [ ]         DGRAM                    16202  @/org/freedesktop/hal/udev_event
unix  16     [ ]         DGRAM                    628931 /dev/log
unix  3      [ ]         STREAM     CONNECTED     31371466 
unix  3      [ ]         STREAM     CONNECTED     31371465 
unix  2      [ ]         DGRAM                    31371462 
unix  2      [ ]         DGRAM                    31368809 
unix  2      [ ]         UNKNOWN    DISCONNECTING 0      
unix  2      [ ]         STREAM                   31356911 
unix  2      [ ]         DGRAM                    31356908 
unix  2      [ ]         UNKNOWN    DISCONNECTING 0      
unix  2      [ ]         STREAM                   31342249 
unix  2      [ ]         DGRAM                    31342246 
unix  2      [ ]         UNKNOWN    DISCONNECTING 0      
unix  2      [ ]         STREAM                   31318762 
unix  2      [ ]         DGRAM                    31318761 
unix  2      [ ]         UNKNOWN    DISCONNECTING 0      
unix  2      [ ]         STREAM                   31263304 
unix  2      [ ]         DGRAM                    31263300 
unix  3      [ ]         STREAM     CONNECTED     31253401 
unix  3      [ ]         STREAM     CONNECTED     31253400 
unix  3      [ ]         STREAM     CONNECTED     31253399 
unix  3      [ ]         STREAM     CONNECTED     31253398 
unix  3      [ ]         STREAM     CONNECTED     31253397 
unix  3      [ ]         STREAM     CONNECTED     31253396 
unix  3      [ ]         STREAM     CONNECTED     31253395 
unix  3      [ ]         STREAM     CONNECTED     31253394 
unix  2      [ ]         STREAM     CONNECTED     31253390 
unix  3      [ ]         STREAM     CONNECTED     31253287 
unix  3      [ ]         STREAM     CONNECTED     31253286 
unix  2      [ ]         DGRAM                    31253283 
unix  3      [ ]         STREAM     CONNECTED     31247947 
unix  3      [ ]         STREAM     CONNECTED     31247946 
unix  3      [ ]         STREAM     CONNECTED     31247945 
unix  3      [ ]         STREAM     CONNECTED     31247944 
unix  3      [ ]         STREAM     CONNECTED     31247943 
unix  3      [ ]         STREAM     CONNECTED     31247942 
unix  3      [ ]         STREAM     CONNECTED     31247941 
unix  3      [ ]         STREAM     CONNECTED     31247940 
unix  2      [ ]         STREAM     CONNECTED     31247936 
unix  3      [ ]         STREAM     CONNECTED     31178429 
unix  3      [ ]         STREAM     CONNECTED     31178428 
unix  3      [ ]         STREAM     CONNECTED     31171939 
unix  3      [ ]         STREAM     CONNECTED     31171938 
unix  2      [ ]         DGRAM                    31171935 
unix  3      [ ]         STREAM     CONNECTED     27227510 
unix  3      [ ]         STREAM     CONNECTED     27227509 
unix  3      [ ]         STREAM     CONNECTED     27227508 
unix  3      [ ]         STREAM     CONNECTED     27227507 
unix  3      [ ]         STREAM     CONNECTED     27227506 
unix  3      [ ]         STREAM     CONNECTED     27227505 
unix  3      [ ]         STREAM     CONNECTED     27227504 
unix  3      [ ]         STREAM     CONNECTED     27227503 
unix  3      [ ]         STREAM     CONNECTED     27227502 
unix  3      [ ]         STREAM     CONNECTED     27227501 
unix  3      [ ]         STREAM     CONNECTED     27227500 
unix  3      [ ]         STREAM     CONNECTED     27227499 
unix  3      [ ]         STREAM     CONNECTED     27227498 
unix  3      [ ]         STREAM     CONNECTED     27227497 
unix  3      [ ]         STREAM     CONNECTED     27227496 
unix  3      [ ]         STREAM     CONNECTED     27227495 
unix  3      [ ]         STREAM     CONNECTED     27227494 
unix  3      [ ]         STREAM     CONNECTED     27227493 
unix  3      [ ]         STREAM     CONNECTED     27227492 
unix  3      [ ]         STREAM     CONNECTED     27227491 
unix  2      [ ]         STREAM     CONNECTED     27227487 
unix  2      [ ]         DGRAM                    24840891 
unix  2      [ ]         DGRAM                    24840814 
unix  2      [ ]         DGRAM                    24834624 
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  2      [ ]         STREAM     CONNECTING    0      /var/run/abrt/abrt.socket
unix  3      [ ]         STREAM     CONNECTED     1131884 
unix  3      [ ]         STREAM     CONNECTED     1131883 
unix  3      [ ]         STREAM     CONNECTED     1131882 
unix  3      [ ]         STREAM     CONNECTED     1131881 
unix  3      [ ]         STREAM     CONNECTED     1131880 
unix  3      [ ]         STREAM     CONNECTED     1131879 
unix  3      [ ]         STREAM     CONNECTED     1131878 
unix  3      [ ]         STREAM     CONNECTED     1131877 
unix  2      [ ]         STREAM     CONNECTED     1131873 
unix  2      [ ]         DGRAM                    1088807 
unix  2      [ ]         DGRAM                    631192 
unix  2      [ ]         DGRAM                    629682 
unix  2      [ ]         DGRAM                    625326 
unix  2      [ ]         DGRAM                    616785 
unix  3      [ ]         DGRAM                    609927 
unix  3      [ ]         DGRAM                    609926 
unix  3      [ ]         STREAM     CONNECTED     17181  
unix  3      [ ]         STREAM     CONNECTED     17180  
unix  3      [ ]         STREAM     CONNECTED     17177  
unix  3      [ ]         STREAM     CONNECTED     17176  
unix  3      [ ]         STREAM     CONNECTED     17173  
unix  3      [ ]         STREAM     CONNECTED     17172  
unix  3      [ ]         STREAM     CONNECTED     17168  
unix  3      [ ]         STREAM     CONNECTED     17167  
unix  3      [ ]         STREAM     CONNECTED     17164  
unix  3      [ ]         STREAM     CONNECTED     17163  
unix  3      [ ]         STREAM     CONNECTED     17160  
unix  3      [ ]         STREAM     CONNECTED     17159  
unix  3      [ ]         STREAM     CONNECTED     17155  
unix  3      [ ]         STREAM     CONNECTED     17154  
unix  3      [ ]         STREAM     CONNECTED     17151  
unix  3      [ ]         STREAM     CONNECTED     17150  
unix  3      [ ]         STREAM     CONNECTED     17147  
unix  3      [ ]         STREAM     CONNECTED     17145  
unix  3      [ ]         STREAM     CONNECTED     17142  
unix  3      [ ]         STREAM     CONNECTED     17141  
unix  3      [ ]         STREAM     CONNECTED     17138  
unix  3      [ ]         STREAM     CONNECTED     17137  
unix  3      [ ]         STREAM     CONNECTED     17134  
unix  3      [ ]         STREAM     CONNECTED     17133  
unix  3      [ ]         STREAM     CONNECTED     17130  
unix  3      [ ]         STREAM     CONNECTED     17129  
unix  3      [ ]         STREAM     CONNECTED     17126  
unix  3      [ ]         STREAM     CONNECTED     17125  
unix  3      [ ]         STREAM     CONNECTED     17122  
unix  3      [ ]         STREAM     CONNECTED     17121  
unix  3      [ ]         STREAM     CONNECTED     17118  
unix  3      [ ]         STREAM     CONNECTED     17117  
unix  3      [ ]         STREAM     CONNECTED     17114  
unix  3      [ ]         STREAM     CONNECTED     17113  
unix  3      [ ]         STREAM     CONNECTED     17110  
unix  3      [ ]         STREAM     CONNECTED     17109  
unix  3      [ ]         STREAM     CONNECTED     17106  
unix  3      [ ]         STREAM     CONNECTED     17105  
unix  3      [ ]         STREAM     CONNECTED     17102  
unix  3      [ ]         STREAM     CONNECTED     17101  
unix  3      [ ]         STREAM     CONNECTED     17098  
unix  3      [ ]         STREAM     CONNECTED     17097  
unix  3      [ ]         STREAM     CONNECTED     17094  
unix  3      [ ]         STREAM     CONNECTED     17093  
unix  3      [ ]         STREAM     CONNECTED     17090  
unix  3      [ ]         STREAM     CONNECTED     17089  
unix  3      [ ]         STREAM     CONNECTED     17087  
unix  3      [ ]         STREAM     CONNECTED     17086  
unix  2      [ ]         DGRAM                    17036  
unix  3      [ ]         STREAM     CONNECTED     16423  /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     16422  
unix  3      [ ]         STREAM     CONNECTED     16417  @/var/run/hald/dbus-PLTrnFGoYa
unix  3      [ ]         STREAM     CONNECTED     16416  
unix  3      [ ]         STREAM     CONNECTED     16378  @/var/run/hald/dbus-PLTrnFGoYa
unix  3      [ ]         STREAM     CONNECTED     16297  
unix  3      [ ]         STREAM     CONNECTED     16197  @/var/run/hald/dbus-YyLOb5j6TM
unix  3      [ ]         STREAM     CONNECTED     16196  
unix  3      [ ]         STREAM     CONNECTED     16175  /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16174  
unix  2      [ ]         DGRAM                    16141  
unix  3      [ ]         STREAM     CONNECTED     16021  /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16020  
unix  3      [ ]         STREAM     CONNECTED     16015  
unix  3      [ ]         STREAM     CONNECTED     16014  
unix  3      [ ]         STREAM     CONNECTED     13036  
unix  3      [ ]         STREAM     CONNECTED     13035   

Answer 1

出现504错误的话。主要主要后面实体服务请求时间估计是要比较大的时间。其实这个可以在你的nginx中加入几个参数试一下。使用fastcgi或是反向代理proxy加入超时时间。还有就是client_header_timeout，client_body_timeout，send_timeout.