Create Backup guide

[geerlingguy]

See #7.

For backup for Pi-hole at least, in the GUI you can go to Settings > Teleporter and click 'Backup'. To automate it through the console, you can run pihole -a -t (can I integrate it with something like my geerlingguy.backup role?).

If I run docker-compose exec pihole /bin/bash pihole -a -t it exports a file inside the container. docker-compose cp is not a supported command yet (see docker/compose#3593), so will have to figure out the best way of scripting this... maybe something like:

1. Create a /backup directory inside the container (mkdir -p /backup).
2. Run the pihole -a -t command inside the /backup directory.
3. Cat the contents of /backup/[latest-file-with-extension].tar.gz and pipe them to file on host.
4. Delete contents of /backup directory (rm -rf /backup/*).

It would be convenient for the pihole -a -t command to have an option to output the archive to shell instead of into a file, that would save the whole file-based annoying process.

[geerlingguy]

I would also like to make it so you could backup the Prometheus data as well, from the configured Docker volume.

[Jatidude]

You could mount that /backup folder as a volume in your docker compose, so the host has access to the files there without needing your step 3.

Your script could docker-compose exec pihole -a -t into the /backup volume mounted and then you can rsync it off somewhere or whatever other backup method that you want.

[shawnsBrain]

You could query out the data from grafana externally using the built-in API.

replace the IP address (here as 192.168.88.185) with the IP of your Pi.
Replace the start and end seconds, and "step" is the seconds resolution.
It returns a JSON string.

download query:
http://192.168.88.185:3030/api/datasources/proxy/12/api/v1/query_range?query=speedtest_download_bits_per_second{}&start=1630847394&end=1631082288&step=300

upload query
http://192.168.88.185:3030/api/datasources/proxy/12/api/v1/query_range?query=speedtest_upload_bits_per_second{}&start=1630847394&end=1631082288&step=300

ping query
http://192.168.88.185:3030/api/datasources/proxy/12/api/v1/query_range?query=speedtest_ping_latency_milliseconds&&start=1632928800&&end=1633533600&&step=600

[jrwagz]

Another simple example, is just to store all data that you want to easily backup into a volume, and then you can easily script the export of those volumes through another temporary container that you spin up just for the purposes of data-exporting.

https://docs.docker.com/storage/volumes/#backup-restore-or-migrate-data-volumes

[Beutelwolf]

Another way would be to map all volumes you want to backup to your host and then use a dedicated backup client container like duplicati

https://hub.docker.com/r/duplicati/duplicati/

to manage your backup.

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[dracostheblack]

@geerlingguy it looks like Prometheus has the ability to create snapshots for backup but you need the admin api enabled https://prometheus.io/docs/prometheus/latest/querying/api/#snapshot. How can we do that through the configuration?

Was using this to back up grafana to s3 https://github.com/ysde/grafana-backup-tool, just need the data now to complete it i think.

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