大佬教程收集整理的这篇文章主要介绍了linux – Systemd退出bash脚本,执行导致失败的命令,而不是继续,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
从命令行运行脚本while循环工作正常.但是当systemd运行它时,当netcat超时时它会立即退出,所以它再也没有机会再试一次.
Jul 23 22:26:21 core-01 systemd[1]: StarTing Push journal logs to logentries.com... Jul 23 22:26:21 core-01 systemd[1]: Started Push journal logs to logentries.com. Jul 23 22:26:21 core-01 bash[880]: trying netcat Jul 23 22:26:31 core-01 bash[880]: Ncat: Connection timed out.
journal2logentries.sh
#!/usr/bin/env bash token=logentriestoken while true do echo 'trying netcat' journalctl -o short -f | awk -v token=$token '{ print token,$0; fflush(); }' | ncat --ssl --ssl-verify data.logentries.com 20000 echo 'sleeping netcat' sleep 30s done
[Unit] Description=Push journal logs to logentries.com After=systemd-journald.service After=systemd-networkd.service [service] Restart=always ExecStart=/bin/bash /home/core/journal2logentries.sh [Install] WantedBy=multi-user.target
更新:
似乎真正的问题是,当netcat死掉系统时,/ bin / sh进程仍在运行.注意:url故意不正确测试
logentries.service - Push journal logs to logentries.com Loaded: loaded (/etc/systemd/system/logentries.service; disabled) Active: active (running) since Mon 2014-07-28 17:12:04 UTc; 1min 48s ago Main PID: 16305 (sh) CGroup: /system.slice/logentries.service ├─16305 /bin/sh -c journalctl -o short -f | awk -v token=token_here '{ print token,$0; fflush(); }' | ncat --ssl --ssl-verify -vv ogentries.com 20000 ├─16306 journalctl -o short -f └─16307 awk -v token=80b4b3b6-1315-4b76-ac69-f530c1dec47f { print token,$0; fflush(); } Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal systemd[1]: logentries.service holdoff time over,scheduling restart. Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal systemd[1]: Stopping Push journal logs to logentries.com... Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal systemd[1]: StarTing Push journal logs to logentries.com... Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal systemd[1]: Started Push journal logs to logentries.com. Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal sh[16305]: Ncat: Version 6.40 ( http://nmap.org/ncat ) Jul 28 17:12:04 ip-172-31-19-155.us-West-2.compute.internal sh[16305]: Ncat: Could not resolve hostname "ogentries.com": Name or service not k@L_874_21@n. QUITTinG.
http://paraf.in/abs-guide/process-sub.html
https://stackoverflow.com/a/18360260/136408
这是我提出的单元文件:
[Unit] Description=Push journal logs to logentries.com After=systemd-journald.service After=systemd-networkd.service [service] Restart=always RestartSec=30s ExecStart=/bin/bash -c "ncat --ssl --ssl-verify data.logentries.com 20000 < <(awk -v token=token_here '{ print token,$0; fflush(); }' < <(journalctl -o short -f))" [Install] WantedBy=multi-user.target
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