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Brandon Rozek 2024-11-26 20:27:34 -05:00
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content/blog/please-monitor-disk-usage.md
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@ -11,18 +11,18 @@ You know one of the worst errors to deal with on Linux?
> No space left on device
Why? Because recovery becomes really annoying. Depending on your luck, Linux may try to cache to disk even when it's not possible causing several commands to fail.
Why? Because recovery becomes really annoying. Depending on your luck, Linux may try to cache to disk even when it's impossible causing quite a few commands to fail.
If you're already in this situation, the best thing you can do is try to locate files to remove. You can run `du -sh *` in any given directory to see the sizes of files and subfolders.
Common places that hold temporary files which can likely be removed are:
Common places that hold temporary files which may be removable are:
- `/tmp`
- `~/.cache`
An even better solution is to not get into this situation in the first place. For that, I introduce a bash script which sends a notification when the disk is getting full!
In order to see the amount of available and total space for a given `$MOUNTPOINT` (for example, `/`), we run the following:
To see the amount of available and total space for a given `$MOUNTPOINT` (for example, `/`), we run the following:
```bash
available_space=$(df "$MOUNTPOINT" | awk 'NR==2 {print $4}')
@ -66,7 +66,7 @@ fi
echo "Mountpoint $MOUNTPOINT is currently using ${usage_percent}% of available space."
```
The only part left undefined here is the `sendMsg` function. For me, I send a [webhook notification](https://brandonrozek.com/blog/webhook-notifications-on-systemd-service-failure/) to Zulip in order to both get notified and have a log of these messages.
The only part left undefined here is the `sendMsg` function. For me, I send a [webhook notification](https://brandonrozek.com/blog/webhook-notifications-on-systemd-service-failure/) to Zulip to both get notified and have a log of these messages.
To have this check regularly automatically, we create a systemd service and timer files.