{"id":33280,"date":"2023-02-23T02:52:42","date_gmt":"2023-07-27T03:55:04","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e%e4%bb%8e-ngx_mruby-%e5%90%af%e5%8a%a8%e5%ae%88%e6%8a%a4%e7%a8%8b%e5%ba%8f%e6%97%b6%e7%9a%84%e9%99%b7%e9%98%b1\/"},"modified":"2024-04-29T15:51:38","modified_gmt":"2024-04-29T07:51:38","slug":"%e5%85%b3%e4%ba%8e%e4%bb%8e-ngx_mruby-%e5%90%af%e5%8a%a8%e5%ae%88%e6%8a%a4%e7%a8%8b%e5%ba%8f%e6%97%b6%e7%9a%84%e9%99%b7%e9%98%b1","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e%e4%bb%8e-ngx_mruby-%e5%90%af%e5%8a%a8%e5%ae%88%e6%8a%a4%e7%a8%8b%e5%ba%8f%e6%97%b6%e7%9a%84%e9%99%b7%e9%98%b1\/","title":{"rendered":"\u5173\u4e8e\u4ece ngx_mruby \u542f\u52a8\u5b88\u62a4\u7a0b\u5e8f\u65f6\u7684\u9677\u9631"},"content":{"rendered":"

\u6211\u539f\u672c\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u7b2c\u4e03\u5929\u7684\u5e16\u5b50\uff0c\u4f46\u662f\u7b2c\u4e8c\u5341\u4e8c\u5929\u662f\u7a7a\u7684\uff0c\u6240\u4ee5\u6211\u642c\u4e86\u8fc7\u6765\u3002@udzura<\/p>\n

\u5f53\u4f7f\u7528ngx_mruby\u5bf9\u547d\u4ee4\u8fdb\u884c\u542f\u52a8\u5e76\u542f\u52a8\u5b88\u62a4\u8fdb\u7a0b\u65f6\uff0c\u53ef\u4ee5\u5f02\u6b65\u8fdb\u884c\uff0c\u8fd9\u662f\u975e\u5e38\u65b9\u4fbf\u7684\u3002\u7136\u800c\uff0c\u5982\u679c\u4f7f\u7528Kernel#system\u65b9\u6cd5\u8fdb\u884c\u542f\u52a8\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u9677\u9631\uff0c\u56e0\u6b64\u6211\u5c06\u4ecb\u7ecd\u4e00\u4e0b\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e76\u4ecb\u7ecd\u4e00\u4e2a\u540d\u4e3amruby-clean-spwan\u7684mgem\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

\u5c1d\u8bd5\u4f7f\u7528Nginx\u521b\u5efa\u5b88\u62a4\u8fdb\u7a0b\u3002 (I will try to create a daemon using Nginx.)<\/h2>\n

\u8fd9\u662f\u4e00\u4e2a\u76f8\u5f53\u4e13\u4e1a\u7684\u7528\u9014\uff0c\u9996\u5148\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4ee5\u4e0b\u7684Ruby\u811a\u672c\u6765\u521b\u5efa\u4e00\u4e2a\u5b88\u62a4\u8fdb\u7a0b\u3002<\/p>\n

#!\/usr\/bin\/ruby<\/span>\r\nProcess<\/span>.<\/span>daemon<\/span>\r\n\r\nrequire<\/span> 'logger'<\/span>\r\nfd<\/span> =<\/span> Logger<\/span>.<\/span>new<\/span>(<\/span>\"\/tmp\/test.log.<\/span>#{<\/span>$$<\/span>}<\/span>\"<\/span>)<\/span>\r\n\r\nloop<\/span> do<\/span>\r\n  fd<\/span>.<\/span>info<\/span> \"Test!! <\/span>#{<\/span>Time<\/span>.<\/span>now<\/span>}<\/span>\"<\/span>\r\n  sleep<\/span> 1<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
ngx_mruby \u7684\u914d\u7f6e\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\u3002<\/p>\n
server<\/span> {\r\n  listen<\/span>      80<\/span> default_server<\/span>;\r\n  server_name<\/span> *.example<\/span>.com<\/span>;\r\n  location<\/span> \/ {\r\n    mruby_content_handler<\/span> \/var<\/span>\/lib<\/span>\/mruby<\/span>\/hook<\/span>.rb<\/span>;\r\n  }\r\n}\r\n<\/code><\/pre>\n
Fox Script \u662f\u8fd9\u6837\u7684\u3002<\/p>\n
unless<\/span> system<\/span> \"\/bin\/sh -c \/usr\/local\/bin\/daemon.rb\"<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"FAILURE\"}'<\/span>\r\nelse<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"OK\"}'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u72b6\u6001\u4e0b\u5c1d\u8bd5\u4f7f\u7528curl\u786e\u5b9e\u53ef\u4ee5\u770b\u5230\u67d0\u79cd\u5b88\u62a4\u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c\u3002<\/p>\n
ubuntu@ubuntu-zesty:~$<\/span> curl -s<\/span> localhost | jq .<\/span>\r\n{\r\n  \"status\": \"OK\"\r\n}\r\n<\/span>ubuntu@ubuntu-zesty:~$<\/span> ps auxf\r\n...\r\n<\/span>nginx     15206  0.0  0.1  37176  1296 ?        Ss   09:55   0:00 nginx: master process \/usr\/sbin\/nginx -c \/etc\/nginx\/nginx.conf\r\nnginx     15207  0.0  0.3  37600  4028 ?        S    09:55   0:00  \\_ nginx: worker process\r\nnginx     15218  0.0  0.7  40548  7272 ?        Sl   09:55   0:00 \/usr\/bin\/ruby \/usr\/local\/bin\/daemon.rb\r\n<\/span><\/code><\/pre>\n
\u770b\u8d77\u6765\u5f88\u4e0d\u9519\uff0c\u4f46\u662f…<\/h2>\n
\u8fd9\u4e2a\u5b88\u62a4\u8fdb\u7a0b\u76f4\u63a5\u7ee7\u627f\u4e86 Nginx \u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u3002 fd0 ~ fd2 \u5f53\u7136\u4f1a\u91cd\u65b0\u6253\u5f00\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f\u5b88\u62a4\u8fdb\u7a0b\u7684\uff0c\u4f46\u5176\u4ed6\u7684\u5c31\u662f\u76f4\u63a5\u4f7f\u7528 Nginx \u7684\u539f\u6837…\u3002<\/p>\n
ubuntu@ubuntu-zesty:~$ sudo ls -l \/proc\/15218\/fd\r\ntotal 0\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 0 -> \/dev\/null\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 1 -> \/dev\/null\r\nl-wx------ 1 nginx nginx 64 Dec 22 09:58 10 -> pipe:[48162]\r\nl-wx------ 1 nginx nginx 64 Dec 22 09:58 11 -> \/tmp\/test.log.15218\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 2 -> \/dev\/null\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 3 -> socket:[48154]\r\nlr-x------ 1 nginx nginx 64 Dec 22 09:58 4 -> pipe:[48161]\r\nl-wx------ 1 nginx nginx 64 Dec 22 09:58 5 -> pipe:[48161]\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 6 -> socket:[46974]\r\nlr-x------ 1 nginx nginx 64 Dec 22 09:58 7 -> pipe:[48162]\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 8 -> anon_inode:[eventpoll]\r\nlrwx------ 1 nginx nginx 64 Dec 22 09:58 9 -> anon_inode:[eventfd]\r\n<\/code><\/pre>\n
mruby\u7684Kernel#system\u76f4\u63a5\u4f7f\u7528\u4e86system(3)\u51fd\u6570\uff0c\u4f46\u662f\u5b83\u5e76\u6ca1\u6709\u5f88\u597d\u5730\u5904\u7406\u4e00\u4e9b\u540e\u7eed\u64cd\u4f5c\u3002\u5982\u679c\u539f\u59cb\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u88ab\u7ee7\u627f\uff0c\u5b50\u8fdb\u7a0b\u7684\u5904\u7406\u53ef\u80fd\u4f1a\u5b58\u5728\u98ce\u9669\u3002<\/p>\n
\u63d0\u4f9b close-on-exec \u529f\u80fd\u7684\u5e72\u51c0\u751f\u6210\u3002<\/h2>\n
\u6240\u4ee5\uff0c\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528clean_spawn\u8fdb\u884c\u91cd\u5199\u3002<\/p>\n
unless<\/span> clean_spawn<\/span> \"\/bin\/sh\"<\/span>,<\/span> \"-c\"<\/span>,<\/span> \"\/usr\/local\/bin\/daemon.rb\"<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"FAILURE\"}'<\/span>\r\nelse<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"OK\"}'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u4ece\u8fd9\u4e2a\u94a9\u5b50\u8d77\u52a8\u7684\u5b88\u62a4\u8fdb\u7a0b\u53ef\u4ee5\u770b\u51fafd\u7684\u72b6\u6001\u5df2\u7ecf\u53d1\u751f\u4e86\u53d8\u5316\u3002<\/p>\n
nginx     15271  0.0  0.7  40504  7428 ?        Sl   10:02   0:00 \/usr\/bin\/ruby \/usr\/local\/bin\/daemon.rb\r\nubuntu@ubuntu-zesty:~$ sudo ls -l \/proc\/15271\/fd\r\ntotal 0\r\nlrwx------ 1 nginx nginx 64 Dec 22 10:02 0 -> \/dev\/null\r\nlrwx------ 1 nginx nginx 64 Dec 22 10:02 1 -> \/dev\/null\r\nlrwx------ 1 nginx nginx 64 Dec 22 10:02 2 -> \/dev\/null\r\nlr-x------ 1 nginx nginx 64 Dec 22 10:02 3 -> pipe:[48379]\r\nl-wx------ 1 nginx nginx 64 Dec 22 10:02 4 -> pipe:[48379]\r\nlr-x------ 1 nginx nginx 64 Dec 22 10:02 5 -> pipe:[48380]\r\nl-wx------ 1 nginx nginx 64 Dec 22 10:02 6 -> pipe:[48380]\r\nl-wx------ 1 nginx nginx 64 Dec 22 10:02 7 -> \/tmp\/test.log.15271\r\n<\/code><\/pre>\n
\u8fd9\u4e9b\u7ba1\u90533\u52306\u662f\u7531CRuby\u521b\u5efa\u7684\uff0c7\u662f\u5728\u811a\u672c\u5185\u90e8\u6253\u5f00\u7684\u4f5c\u4e3a\u65e5\u5fd7\u6587\u4ef6\u7684\u3002\u8fd9\u610f\u5473\u7740\u4e0d\u518d\u6709\u6765\u81eaNginx\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n
\u5728clean_spawn\u51fd\u6570\u5185\u90e8\uff0c\u66f4\u5177\u4f53\u5730\u8bf4\uff0c<\/p>\n
    \n
  • \n
      fork\u3092\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u65e2\u5b58\u306efile descriptor\u306b\u5168\u3066 close-on-exec \u30d5\u30e9\u30b0\u3092\u7acb\u3066\u308b<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            exec\u3092\u3059\u308b<\/ul>\n
            \u6211\u4f1a\u4ed4\u7ec6\u5730\u505a\u8fd9\u4ef6\u4e8b\u3002<\/p>\n
            \u66f4\u8fdb\u4e00\u6b65\u7684\u9677\u9631 de<\/h2>\n
            \u4e0d\u8fc7\uff0c\u5728\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u9677\u9631\uff0c\u5c31\u662f\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u91cd\u65b0\u542f\u52a8Nginx\uff0c\u8fd9\u4e2a\u5b88\u62a4\u8fdb\u7a0b\u5c31\u4f1a\u5b8c\u5168\u6d88\u5931…\u3002<\/p>\n
            ubuntu@ubuntu-zesty:~$ sudo systemctl restart nginx                                                                                               \r\nubuntu@ubuntu-zesty:~$ ps auxf | grep ruby\r\nubuntu   15298  0.0  0.1  12960  1028 pts\/0    S+   10:06   0:00              \\_ grep --color=auto ruby\r\n<\/code><\/pre>\n
            \u8c01\u5728\u8fdb\u884c\u6740\u6b7b\u64cd\u4f5c\u5462\uff1f\u901a\u8fc7\u4f7f\u7528gdb\u53ef\u4ee5\u8ffd\u8e2a\uff0c\u6240\u4ee5\u6211\u5c06\u8fdb\u884c\u9644\u52a0\u3002<\/p>\n
            nginx     15360  0.0  0.7  40580  7592 ?        Sl   10:07   0:00 \/usr\/bin\/ruby \/usr\/local\/bin\/daemon.rb                                           \r\n<\/span>ubuntu@ubuntu-zesty:~$<\/span> sudo <\/span>gdb -p<\/span> 15360                                 \r\nGNU gdb (Ubuntu 7.12.50.20170314-0ubuntu1.1) 7.12.50.20170314-git        \r\nCopyright (C) 2017 Free Software Foundation, Inc.                        \r\n<\/span>License GPLv3+: GNU GPL version 3 or later <http:\/\/gnu.org\/licenses\/gpl.html><\/span>                                                                     \r\nThis is free software: you are free to change and redistribute it.       \r\nThere is NO WARRANTY, to the extent permitted by law.  Type \"show copying\"                                                                        \r\nand \"show warranty\" for details.    \r\nThis GDB was configured as \"x86_64-linux-gnu\".                           \r\nType \"show configuration\" for configuration details.                     \r\nFor bug reporting instructions, please see:                              \r\n<\/span><http:\/\/www.gnu.org\/software\/gdb\/bugs\/><\/span>.<\/span>                                 \r\nFind the GDB manual and other documentation resources online at:         \r\n<\/span><http:\/\/www.gnu.org\/software\/gdb\/documentation\/><\/span>.<\/span>                        \r\nFor help, type \"help\".              \r\nType \"apropos word\" to search for commands related to \"word\".            \r\nAttaching to process 15360          \r\n[New LWP 15362]                     \r\n[Thread debugging using libthread_db enabled]                            \r\nUsing host libthread_db library \"\/lib\/x86_64-linux-gnu\/libthread_db.so.1\".                                                                        \r\npthread_cond_timedwait@@GLIBC_2.3.2 () at ..\/sysdeps\/unix\/sysv\/linux\/x86_64\/pthread_cond_timedwait.S:225                                          \r\n225     ..\/sysdeps\/unix\/sysv\/linux\/x86_64\/pthread_cond_timedwait.S: No such file or directory.                                                    \r\n(gdb) c                             \r\nContinuing.                         \r\n<\/span><\/code><\/pre>\n
            \u5728\u8fd9\u79cd\u72b6\u6001\u4e0b\uff0c\u5982\u679c\u4ece\u53e6\u4e00\u4e2a\u7ec8\u7aef\u8fd0\u884c\u3010systemctl restart nginx\u3011\u5c31\u4f1a… \u6211\u53d1\u73b0\u8fd9\u662f\u7531SIGTERM\u4fe1\u53f7\uff0cPID\u4e3a1\u5373\u6765\u81easystemd\u53d1\u9001\u7684\u3002<\/p>\n
            Thread 2 \"ruby-timer-thr\" received signal SIGTERM, Terminated.           \r\n[Switching to Thread 0x7f7fef5d7700 (LWP 15362)]                         \r\n0x00007f7feec6cd8d in poll () at ..\/sysdeps\/unix\/syscall-template.S:84   \r\n84      ..\/sysdeps\/unix\/syscall-template.S: No such file or directory.   \r\n(gdb) ptype $_siginfo               \r\ntype = struct {\r\n    int si_signo;\r\n    int si_errno;\r\n    int si_code;\r\n    union {\r\n        int _pad __attribute__ ((vector_size(28)));\r\n        struct {...} _kill;\r\n        struct {...} _timer;\r\n        struct {...} _rt;\r\n        struct {...} _sigchld;\r\n        struct {...} _sigfault;\r\n        struct {...} _sigpoll;\r\n    } _sifields;\r\n}\r\n(gdb) p $_siginfo._sifields._sigchld.si_pid\r\n$1 = 1 <- !!!\r\n<\/code><\/pre>\n
            \u8fd9\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f\u5b9e\u9645\u4e0a\uff0c\u8fd9\u662f\u7531\u4e8e\u5b88\u62a4\u8fdb\u7a0b\u7684cgroup\u4e0e\u539f\u59cb\u7684nginx\u670d\u52a1\u7684cgroup\u662f\u76f8\u540c\u7684\u3002<\/p>\n
            nginx     15703  0.0  0.1  37176  1296 ?        Ss   10:12   0:00 nginx: master process \/usr\/sbin\/nginx -c \/etc\/nginx\/nginx.conf\r\nnginx     15705  0.0  0.3  37600  3972 ?        S    10:12   0:00  \\_ nginx: worker process\r\nnginx     15718  0.0  0.7  40488  7340 ?        Sl   10:14   0:00 \/usr\/bin\/ruby \/usr\/local\/bin\/daemon.rb\r\n<\/span>ubuntu@ubuntu-zesty:~$<\/span> sudo grep <\/span>systemd \/proc\/15703\/cgroup \r\n1:name=systemd:\/system.slice\/nginx.service\r\n<\/span>ubuntu@ubuntu-zesty:~$<\/span> sudo grep <\/span>systemd \/proc\/15718\/cgroup \r\n1:name=systemd:\/system.slice\/nginx.service\r\n<\/span><\/code><\/pre>\n
            systemd\u5728\u91cd\u542f\u65f6\u5f15\u7528\u4e86\u8fd9\u4e2asystemd\u5b50\u7cfb\u7edf\u3002\u5bf9\u4e8e\u4e0d\u662f\u76f4\u63a5\u7531Unit\u6587\u4ef6\u7ba1\u7406\u7684\u8fdb\u7a0b\uff0csystemd\u4f1a\u5411\u6240\u5c5e\u7ec4\u4e2d\u7684\u8fdb\u7a0b\u53d1\u9001SIGTERM -> SIGKILL\u7684\u4fe1\u53f7\u987a\u5e8f\u3002\u8bf7\u53c2\u8003\u7b2c29\u5f20\u3002<\/p>\n
            \u4fee\u6539cgroup\u7684systemd\u7ec4\u3002<\/h2>\n
            \u6240\u4ee5\uff0cclean_spawn\u6709\u4e00\u4e2a\u9009\u9879\uff0c\u7528\u4e8e\u79fb\u52a8\u5b88\u62a4\u8fdb\u7a0b\u7684cgroup\u3002<\/p>\n
            CleanSpawn<\/span>.<\/span>cgroup_root_path<\/span> =<\/span> \"\/sys\/fs\/cgroup\/systemd\"<\/span>\r\nunless<\/span> clean_spawn<\/span> \"\/bin\/sh\"<\/span>,<\/span> \"-c\"<\/span>,<\/span> \"\/usr\/local\/bin\/daemon.rb\"<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"FAILURE\"}'<\/span>\r\nelse<\/span>\r\n  Nginx<\/span>.<\/span>rputs<\/span> '{\"status\": \"OK\"}'<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
            \u76ee\u524d\uff0c\u5982\u679cNginx\u6ca1\u6709\u4ee5root\u8eab\u4efd\u542f\u52a8\uff0c\u5219\u6b64\u9009\u9879\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n
            \u5982\u679c\u5c06\u5176\u8bbe\u7f6e\u4e3a\u8fd9\u6837\uff0c\u91cd\u65b0\u542f\u52a8Nginx\u65f6\u5c31\u4e0d\u4f1a\u5f71\u54cd\u5b88\u62a4\u8fdb\u7a0b\u3002\u771f\u662f\u592a\u597d\u4e86…<\/p>\n
            ubuntu@ubuntu-zesty:~$<\/span> sudo <\/span>systemctl restart nginx          \r\nubuntu@ubuntu-zesty:~$<\/span> ps auxf | grep <\/span>ruby\r\nubuntu   15820  0.0  0.0  12960   936 pts\/0    S+   10:18   0:00  |           \\_ grep --color=auto ruby\r\nroot     15789  0.0  0.7  40500  7356 ?        Sl   10:17   0:00 \/usr\/bin\/ruby \/usr\/local\/bin\/daemon.rb\r\n<\/span><\/code><\/pre>\n
            \n
            \u6211\u4ecb\u7ecd\u4e86\u7528\u4e8engx_mruby\u7684\u4e13\u95e8\u5904\u7406\u7684mgem\u3002<\/p>\n
            \u6211\u60f3\u505a\u7684\u4e8b\u60c5\u96d6\u7136\u6709\u9ede\u72c2\u71b1\uff0c\u4f46\u901a\u904e\u9019\u500b\u904e\u7a0b\u6211\u7372\u5f97\u4e86Linux\/UNIX\u76f8\u7576\u91cd\u8981\u7684\u77e5\u8b58\uff0c\u6240\u4ee5\u6211\u5beb\u4e86\u4e0b\u4f86\u3002\u5c31\u662f\u4eca\u5929\u9019\u6a23\u5b50…\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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