{"id":534,"date":"2020-01-18T00:27:52","date_gmt":"2020-01-17T16:27:52","guid":{"rendered":"https:\/\/www.myway5.com\/?p=534"},"modified":"2023-07-05T21:34:38","modified_gmt":"2023-07-05T13:34:38","slug":"container-signal","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2020\/01\/18\/container-signal\/","title":{"rendered":"\u5bb9\u5668\u4e2d\u7a0b\u5e8f\u7684\u4fe1\u53f7\u6355\u6349"},"content":{"rendered":"

\u4e00\u3001\u95ee\u9898\u63cf\u8ff0<\/h2>\n

\u9879\u76ee\u4e2d\u4f7f\u7528\u4e86 argo \u5728 kubernetes \u96c6\u7fa4\u4e2d\u505a\u5de5\u4f5c\u6d41\u7684\u8c03\u5ea6\u3002argo \u63d0\u4f9b\u4e86\u5de5\u4f5c\u6d41\u7684\u505c\u6b62\u529f\u80fd\uff0c\u5176\u539f\u7406\u5927\u81f4\u662f\u68c0\u67e5\u6b63\u5728\u8fd0\u884c\u7684 Pod\uff0c\u5411\u8be5 Pod \u4e2d\u7684 wait \u5bb9\u5668\u53d1\u9001 USR2 \u4fe1\u53f7\uff0cwait \u5bb9\u5668\u6536\u5230 USR2 \u4fe1\u53f7\u540e\uff0c\u5728\u4e3b\u673a\u4e0a\u7684\u8c03\u7528 docker kill --signal TERM main_container_id<\/code> \u6765\u505c\u6b62\u6211\u4eec\u7684\u7a0b\u5e8f\u5bb9\u5668, \u5982\u679c 10s \u540e\u5bb9\u5668\u8fd8\u672a\u505c\u6b62\uff0c\u5219\u53d1\u9001 SIGKILL \u6765\u5f3a\u5236\u7ec8\u6b62\u3002\u4f46\u662f\u6211\u5728\u5b9e\u73b0 argo \u5de5\u4f5c\u6d41\u4e2d\u8c03\u5ea6 tfjob<\/code> \u65f6\u51fa\u73b0\u4e86\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n

\"argo_scheduler_tfjob\"<\/p>\n

\u5728argo\u505c\u6b62\u5de5\u4f5c\u6d41\u65f6\uff0c\u6b63\u5728\u8fd0\u884c\u7684 step2 \u4e2d\u7684 manager \u76d1\u542c\u4e86 TERM \u4fe1\u53f7\uff0c\u4ee5\u4fbf\u5728\u5de5\u4f5c\u6d41\u505c\u6b62\u65f6\u540c\u6b65\u505c\u6b62 tfjob\u3002\u4f46\u662f\u4e8b\u5b9e\u60c5\u51b5\u5374\u662f manager \u9000\u51fa\u4e86\uff0c\u4f46\u662f\u6ca1\u6709\u6536\u5230\u4efb\u4f55\u7684 TERM \u4fe1\u53f7\u3002<\/p>\n

\u4e8c\u3001\u95ee\u9898\u5256\u6790<\/h2>\n

\u68c0\u67e5\u8fd9\u4e2a\u95ee\u9898\u7684\u7b2c\u4e00\u6b65\u662f\u5f04\u6e05\u695a docker kill<\/code> \u80cc\u540e\u53d1\u751f\u4e86\u4ec0\u4e48\uff0c\u5b98\u7f51\u7684\u8d44\u6599\u4e2d\u6709\u4ee5\u4e0b\u7684\u63cf\u8ff0\uff1a<\/p>\n

\n Note: ENTRYPOINT and CMD in the shell form run as a subcommand of \/bin\/sh -c, which does not pass signals. This means that the executable is not the container\u2019s PID 1 and does not receive Unix signals.\n<\/p><\/blockquote>\n

\u5f53\u6211\u4eec\u7528 sh<\/code> \u6267\u884c\u4e00\u6bb5 shell script \u65f6\uff0c\u5728 shell script \u4e2d\u7684\u53ef\u6267\u884c\u6587\u4ef6\u7684 PID \u4e0d\u662f1\uff0c\u5e76\u4e14 sh \u4e5f\u4e0d\u4f1a\u5e2e\u5fd9\u8f6c\u53d1 TERM \u4fe1\u53f7\uff0c\u5bfc\u81f4\u6211\u4eec\u7684\u53ef\u6267\u884c\u6587\u4ef6\u65e0\u6cd5\u63a5\u6536\u5230\u7ec8\u6b62\u4fe1\u53f7\uff0c\u5e76\u6267\u884c\u6e05\u7406\u903b\u8f91\u3002<\/p>\n

\u6211\u4eec\u7684 manager \u786e\u5b9e\u662f\u7528\u4e86\u4e00\u6bb5 shell script \u6765\u542f\u52a8\u7684\uff0c\u53ef\u80fd\u5c31\u662f\u56e0\u4e3a\u8fd9\u4e2a\u539f\u56e0\u5bfc\u81f4\u65e0\u6cd5\u6536\u5230 TERM \u4fe1\u53f7\u3002<\/p>\n

\u4e09\u3001\u95ee\u9898\u590d\u73b0<\/h2>\n

\u6211\u5199\u4e86\u4e00\u6bb5\u5f88\u7b80\u5355\u7684 go \u7a0b\u5e8f\uff0c\u76d1\u542c\u4e86 TERM \u4fe1\u53f7\uff0c\u7136\u540e\u6253\u5370\u4e00\u6bb5\u6587\u5b57\u3002<\/p>\n

package main\n\nimport (\n    \"log\"\n    \"os\"\n    \"os\/signal\"\n    \"syscall\"\n)\n\nfunc main() {\n    sigs := make(chan os.Signal, 1)\n    signal.Notify(sigs, syscall.SIGTERM, syscall.SIGINT)\n\n    s, ok := <-sigs\n    if !ok {\n        log.Println(\"\u4fe1\u53f7\u63a5\u6536\u51fa\u9519\")\n        os.Exit(1)\n    }\n\n    log.Println(\"\u6536\u5230\u4fe1\u53f7:\", s.String())\n}\n<\/code><\/pre>\n
\u6211\u7684 Dockerfile \u5982\u4e0b:<\/p>\n
FROM alpine:latest\nLABEL maintainr=\"jiangpengfei <jiangpengfei12@gmail.com>\"\n\nCOPY main \/usr\/bin\/main\nCOPY run.sh \/usr\/bin\/run.sh\nRUN chmod +x \/usr\/bin\/main && chmod +x \/usr\/bin\/run.sh\n\nCMD [\"sh\", \"-c\", \"\/usr\/bin\/run.sh\"]\n<\/code><\/pre>\n
run.sh \u5982\u4e0b:<\/p>\n
#!\/bin\/sh\n\/usr\/bin\/main\n<\/code><\/pre>\n
\u6267\u884c\u8fd9\u4e2a\u5bb9\u5668\u540e\uff0c\u67e5\u770b\u5bb9\u5668\u5185\u7684\u8fdb\u7a0b\uff1a<\/p>\n
PID   USER     TIME  COMMAND\n    1 root      0:00 {busybox} ash \/usr\/bin\/run.sh\n    6 root      0:00 \/usr\/bin\/main\n   12 root      0:00 sh\n   17 root      0:00 ps\n<\/code><\/pre>\n
\u53ef\u4ee5\u53d1\u73b0\uff0crun.sh<\/code> \u662f PID \u4e3a1, main<\/code> \u7a0b\u5e8f\u662f6\u3002\u6b64\u65f6\u6211\u4eec\u4f7f\u7528 docker kill --signal TERM main_container_id<\/code> \u6765\u505c\u6b62\u5bb9\u5668\uff0c\u53d1\u73b0\u786e\u5b9e\u662f\u6ca1\u6709\u53cd\u5e94\u7684\u3002\u56e0\u4e3a TERM \u4fe1\u53f7\u4f1a\u53d1\u9001\u7ed9 PID \u4e3a 1 \u7684\u8fdb\u7a0b\u3002\u540c\u65f6\u4e5f\u56e0\u4e3a sh \u4e0d\u54cd\u5e94 TERM \u4fe1\u53f7\uff0c\u4e5f\u4e0d\u4f1a\u8f6c\u53d1\u8be5\u4fe1\u53f7\u7ed9\u5b50\u8fdb\u7a0b\uff0c\u6240\u4ee5\u5bb9\u5668\u4e5f\u4e0d\u4f1a\u9000\u51fa\u3002\u5982\u679c\u6211\u4eec\u4f7f\u7528 docker stop<\/code> \u9000\u51fa\u7684\u8bdd\uff0c\u4f1a\u53d1\u73b0\u5f88\u6162\uff0c\u8fd9\u662f\u56e0\u4e3a docker stop<\/code> \u4f1a\u5c1d\u8bd5\u5148\u7528 TERM \u4fe1\u53f7\u6765\u7ec8\u6b62\u8fdb\u7a0b\uff0c\u4e00\u6bb5\u65f6\u95f4\u540e\u53d1\u73b0\u6ca1\u6709\u9000\u51fa\u7684\u8bdd\u518d\u4f7f\u7528 KILL \u4fe1\u53f7\u3002<\/p>\n
\u56db\u3001\u89e3\u51b3\u65b9\u6848<\/h2>\n
\u8fd9\u4e2a\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\u6709\u5f88\u591a\uff0c\u8981\u4e48\u8ba9\u6211\u4eec\u7684\u7a0b\u5e8f\u8fdb\u7a0b\u6210\u4e3a PID 1\uff0c\u8981\u4e48\u8ba9 PID \u4e3a 1 \u7684\u8fdb\u7a0b\u8f6c\u53d1\u8fd9\u4e2a TERM \u4fe1\u53f7\u7ed9\u6211\u4eec\u7684\u5b50\u8fdb\u7a0b\u3002<\/p>\n
\u65b9\u6cd5\u4e00: \u5728 shell script \u4e2d\u4f7f\u7528 exec<\/strong><\/p>\n
\u5c06\u6211\u4eec\u7684 run.sh<\/code> \u6539\u6210\u5982\u4e0b:<\/p>\n
#!\/bin\/sh\nexec \/usr\/bin\/main\n<\/code><\/pre>\n
\u7136\u540e\u518d\u67e5\u770b\u5bb9\u5668\u5185\u7684\u8fdb\u7a0b\u5217\u8868\uff1a<\/p>\n
PID   USER     TIME  COMMAND\n    1 root      0:00 \/usr\/bin\/main\n   11 root      0:00 sh\n   16 root      0:00 ps\n<\/code><\/pre>\n
\u53ef\u4ee5\u53d1\u73b0\uff0cmain<\/code> \u8fdb\u7a0b\u7684PID \u662f 1, \u6211\u4eec\u4f7f\u7528 docker kill --signal TERM main_container_id<\/code> \u6765\u6740\u6b7b\u8fdb\u7a0b\uff0c\u51fa\u73b0\u5982\u4e0b\u6253\u5370\u8bed\u53e5\uff1a<\/p>\n
2020\/01\/17 23:46:24 \u6536\u5230\u4fe1\u53f7: terminated\n<\/code><\/pre>\n
\u53ef\u89c1\uff0cexec<\/code> \u53ef\u4ee5\u8ba9\u6211\u4eec\u7684 main \u8fdb\u7a0b\u6210\u4e3a PID \u4e3a 1, \u5173\u4e8e exec \u7684\u4f5c\u7528\u63cf\u8ff0\u5982\u4e0b:<\/p>\n
\n  The exec() family of functions replaces the current process image with a new process image.\n<\/p><\/blockquote>\n
\u5373\u4f7f\u7528\u65b0\u8fdb\u7a0b\u7684\u955c\u50cf\u66ff\u6362\u5f53\u524d\u8fdb\u7a0b\u7684\u955c\u50cf\u6570\u636e\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3aexec\u7cfb\u7edf\u8c03\u7528\u5e76\u6ca1\u6709\u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\uff0c\u53ea\u662f\u66ff\u6362\u4e86\u539f\u6765\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u7684\u5185\u5bb9\u3002\u539f\u8fdb\u7a0b\u7684\u4ee3\u7801\u6bb5\uff0c\u6570\u636e\u6bb5\uff0c\u5806\u6808\u6bb5\u88ab\u65b0\u7684\u8fdb\u7a0b\u6240\u4ee3\u66ff\u3002\u8fd9\u6837\u6211\u4eec\u7684 main \u8fdb\u7a0b\u5c31\u987a\u5229\u6210\u7ae0\u7684\u66ff\u6362\u4e86 sh \u8fdb\u7a0b\u6210\u4e3a PID \u4e3a 1 \u7684\u8fdb\u7a0b\u4e86\u3002<\/p>\n
\u65b9\u6cd5\u4e8c: \u76f4\u63a5\u4f7f\u7528 main \u4f5c\u4e3a\u955c\u50cf\u5165\u53e3<\/strong><\/p>\n
\u8fd9\u662f\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u4e86\uff0c\u4f46\u662f\u5f88\u591a\u65f6\u5019\u4f1a\u6709\u9650\u5236\uff0c\u56e0\u4e3a\u6211\u4eec\u5e0c\u671b\u5728 shell script \u4e2d\u5199\u4e00\u4e9b\u903b\u8f91\u6765\u8c03\u7528\u7a0b\u5e8f\u3002<\/p>\n
\u65b9\u6cd5\u4e09: \u501f\u52a9\u7b2c\u4e09\u65b9\u7a0b\u5e8f<\/strong><\/p>\n
\u4e00\u4e9b\u7b2c\u4e09\u65b9\u7684\u7a0b\u5e8f\u4e13\u95e8\u63d0\u4f9b\u4e86\u8fd9\u6837\u7684\u4f5c\u7528\uff0c\u4ee5\u5b83\u4eec\u4f5c\u4e3a\u542f\u52a8\u7684\u5165\u53e3\uff0c\u8fd9\u4e9b\u7b2c\u4e09\u65b9\u7a0b\u5e8f\u4f1a watch \u6240\u6709\u5b83\u4ea7\u751f\u7684\u5b50\u8fdb\u7a0b\uff0c\u5728\u8fd9\u4e9b\u5b50\u8fdb\u7a0b\u9000\u51fa\u540e\u81ea\u52a8\u9000\u51fa\uff0c\u5e76\u4e14\u5728\u5176\u6536\u5230 TERM \u4fe1\u53f7\u540e\u53d1\u9001\u7ed9\u5b50\u8fdb\u7a0b\u3002<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u7528 smell-baron<\/code><\/a> \u8fd9\u4e2a\u5e94\u7528\u4f5c\u4e3a\u4f8b\u5b50<\/p>\n
\u4fee\u6539 Dockerfile:<\/p>\n
FROM alpine:latest\nLABEL maintainr=\"jiangpengfei <jiangpengfei12@gmail.com>\"\n\nCOPY main \/usr\/bin\/main\nCOPY run.sh \/usr\/bin\/run.sh\nRUN chmod +x \/usr\/bin\/main && chmod +x \/usr\/bin\/run.sh\nRUN wget -O \/usr\/bin\/smell-baron https:\/\/github.com\/insidewhy\/smell-baron\/releases\/download\/v0.4.2\/smell-baron.musl && chmod +x \/usr\/bin\/smell-baron\n\nCMD [\"\/usr\/bin\/smell-baron\", \"\/usr\/bin\/run.sh\"]\n<\/code><\/pre>\n
\u67e5\u770b\u5bb9\u5668\u5185\u7684\u8fdb\u7a0b:<\/p>\n
PID   USER     TIME  COMMAND\n    1 root      0:00 \/usr\/bin\/smell-baron \/usr\/bin\/run.sh\n    6 root      0:00 \/usr\/bin\/main\n   14 root      0:00 sh\n   19 root      0:00 ps\n<\/code><\/pre>\n
\u4f7f\u7528 docker kill<\/code> \u53d1\u73b0 main \u6536\u5230\u4e86 TERM \u4fe1\u53f7\u3002<\/p>\n
\n  1.Multiple commands can be run, smell-baron will exit when all the watched processes have exited.<\/p>\n
  2.Whether a spawned process is watched can be configured.<\/p>\n
  3.smell-baron can be told to signal all child processes on termination, this allows it to cleanly deal with processes that spawn a subprocess in a different process group then fail to clean it up on exit.\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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