docker - 在容器中运行时重新加载 telegraf 配置的最佳方法

Question

我在 Synlogy NAS 的容器中运行 telegraf。当我在 telegraf.conf 中进行一些更改时，只是询问重新加载配置的最佳方法是什么。

我在这里看到了重启整个容器的建议: https://hub.docker.com/_/telegraf

像这样:

$ docker restart telegraf

如何使用 SIGHUP 为容器内的 telegraf 进程执行 kill 命令？

像这样:

admin@Docker:~% sudo docker ps | grep telegraf
Password:
4c69a263326d        telegraf:latest                       "/entrypoint.sh tele…"   3 weeks ago         Up 20 minutes                           telegraf
admin@Docker:~% sudo docker exec -it -u 0 4c69a263326d kill -1 1
admin@Docker:~% sudo docker ps | grep telegraf
4c69a263326d        telegraf:latest                       "/entrypoint.sh tele…"   3 weeks ago         Up 21 minutes                           telegraf
admin@Docker:~% sudo docker logs --tail 10 4c69a263326d
2020-06-09T11:50:37Z I! [agent] Hang on, flushing any cached metrics before shutdown
2020-06-09T11:50:37Z I! Starting Telegraf 1.14.2
2020-06-09T11:50:37Z I! Using config file: /etc/telegraf/telegraf.conf
2020-06-09T11:50:37Z I! Loaded inputs: snmp
2020-06-09T11:50:37Z I! Loaded aggregators:
2020-06-09T11:50:37Z I! Loaded processors:
2020-06-09T11:50:37Z I! Loaded outputs: influxdb
2020-06-09T11:50:37Z I! Tags enabled: host=Docker
2020-06-09T11:50:37Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"Docker", Flush Interval:10s
2020-06-09T11:50:37Z W! [outputs.influxdb] When writing to [https://127.0.0.1:8086]: database "telegraf" creation failed: 403 Forbidden

Answer 1

Telegraf 可以使用 --watch-config 命令行选项重新加载修改后的配置:

  --watch-config                 Telegraf will restart on local config changes. Monitor changes
                                 using either fs notifications or polling.  Valid values: 'inotify' or 'poll'.
                                 Monitoring is off by default.