https://github.com/icy/golo
Prevent an application from running twice. This is a Golang version of rolo/solo
https://github.com/icy/golo
crontab golang rolo solo sysadmin
Last synced: 7 months ago
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Prevent an application from running twice. This is a Golang version of rolo/solo
- Host: GitHub
- URL: https://github.com/icy/golo
- Owner: icy
- Created: 2018-06-01T10:13:58.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2018-06-06T14:06:46.000Z (over 7 years ago)
- Last Synced: 2025-02-27T21:21:08.692Z (8 months ago)
- Topics: crontab, golang, rolo, solo, sysadmin
- Language: Go
- Homepage:
- Size: 5.86 KB
- Stars: 4
- Watchers: 3
- Forks: 1
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
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README
## Description
`golo` prevents an application from running twice. This is useful when
you launch your task thanks to `cron`.
The basic ideas come from the original `Perl` application [solo](http://github.com/timkay/solo)
and its `Ruby` version [rolo](http://github.com/icy/rolo).
## Example usage
Try to create `ssh` port forwarding from local host to remote server.
As we don't want to run this command multiple twice, `golo` helps
```
$ go run golo.go -timeout 10 -port 4040 --no-bind -- /usr/bin/ssh MyServer -o "LocalForward localhost:4040 localhost:8888" -fN
:: Port is available. App is not running
:: Now staring application '/usr/bin/ssh' from .
$ go run golo.go -timeout 10 -port 4040 --no-bind -- /usr/bin/ssh MyServer -o "LocalForward localhost:4040 localhost:8888" -fN
:: Port is not available. App is running?
```
Below the crontab settings to create some `ssh` tunnels. If any tunnel is
broken due to network issue, `cron` will try to restart them in within 1 minute.
If the tunnel is still work, `cron` will simply exit.
```
$ crontab -l
*/1 * * * * golo -port 6432 --address 127.0.0.1 --no-bind /usr/bin/ssh zproxydev -fN
*/1 * * * * golo -port 6442 --address 127.0.0.1 --no-bind /usr/bin/ssh zproxystaging -fN
*/1 * * * * golo -port 6452 --address 127.0.0.1 --no-bind /usr/bin/ssh zproxyproduction -fN
```