How do you upload a snapshot?
Basically, as you said. Mount the data somewhere and back up its contents.
I back up snapshots rather than current data, because I don’t want to stop the running containers that read and write from that data. I’d rather avoid the situation where the container is writing data while it’s being backed up. The back up happens shortly after the daily snapshot is made so the difference between current and snapshot data is small.
As others have said, with an incremental filesystem level mechanism, the backup process won’t be too taxing for the CPU. I have ZFS set up which makes this easy and I make hourly snapshots using sanoid which also get sent to another mirrored pair of connected drives using syncoid. Then, once a day, I upload encrypted daily snapshots to a bucket in the cloud using restic. Sounds complicated, but actually sanoid/syncoid and restic do all the heavy lifting. All I did is automate their schedules using systemd timers and some scripts to backup the right directories.
What benefit do you get from running a Cloudflare proxy if you’re directing it to a VPS? I used to run with a Cloudflare proxy when my reverse proxy was hosted at home. Since then, I’ve moved it to a VPS and I no longer use the Cloudflare proxy, because I only expose the IP address of the VPS which is fine. Arguably Cloudflare provides you with DDoS protection, but that’s so far never been a problem for me.
Correct. And getting the right configuration is pretty easy. Debian has good defaults. The only changes I make are configuring it to send emails to me when updates are installed. These emails will also then tell you if you need to reboot in subject line which is very convenient. As I said I also blacklist kernel updates on the server that uses ZFS as recompiling the modules causes inconsistencies between kernel and user space until a reboot. If you set up emails, you will also know when these updates are ready to be installed because you’ll be notified that they’re being held van.
So yea, I strongly recommend unattended-upgrades with email configured.
Edit: you can also make it reboot itself if you want to. Might be worth it on devices that don’t run anything very important and that can handle downtime.
A few simple rules make it quite simple for me:
This has been working great for me for the past several months.
For containers, I rely on Podman auto update and systemd. Actually my own script that imitates its behavior because I had issues with Podman pulling images which were not new, but which nevertheless triggered restarts of the containers. However, I lock the major version number manually and check and update major versions manually. Major version updates stung me too much in the past when I’d update them after a long break.
I expose my services to the web via my own VPS proxy :) I simply run only very few of them, use 2FA when supported, keep them up to date, run each service as rootless podman, and have a very verbose logcheck set up in case the container environment gets compromised, and allow only ports 80 and 443, and, very importantly, truly sensitive data (documents and such) is encrypted at rest so that even if my services are compromised that data remains secure.
For ssh, I have set up a separate raspberry pi as a wireguard server into my home network. Therefore, for any ssh management I first connect via this wireguard connection.
Thanks for this useful reply! I think I’ll just need to closely examine my setup and figure out if I really need the ability to up/down interfaces like I described or whether the more persistent approach of networkd is actually more suitable for me. Sometimes I just want to reproduce behaviour that I’ve used before, but may not actually need.
Thanks for your reply! One thing I’m struggling with networkd is hysteresis. That is, toggling the interface down and then back up does not do what I expect it to. That is, setting the interface down does not clear up the configuration, and setting the interface up does not reconfigure the interface. I have to run reconfigure for that. I was hoping that the declarative approach of networkd would make it easy to predict interface state and configuration.
This does make sense because configuration is not the same as operational state. However, what would the equivalent of ifdown (set interface down and remove configuration) and ifup (set interface up and reconfigure) be using networkd and networkctl? This kind of feature would be useful for me to test config changes, debug networking issues, disconnect part of the network while I’m making some changes, etc.
Thanks a lot for these tips! Especially about using the upstream deb.
I subscribed. I use navidrome since it has a slick UI and supports the subsonic API. Having both in one is great.
Thanks for your reply! Out of curiosity, what made you go with Prometheus over zabbix and check_mk in the end? Those two seem to be heavily recommended.
Why not have the reverse proxy also do renewal for the SMTP relay certificate and just rsync it to the relay? For a while I had one of my proxies do all the renewals and the other would rsync it.
I deploy as much as I possibly can via Ansible. Then the Ansible code serves as the documentation. I also keep the underlying OS the same on all machines to avoid different OS conventions. All my machines run Debian. The few things I cannot express in Ansible, such as network topology, I draw a diagram for in draw.io, but that’s it.
Also, why not automate the certificate renewal with certbot? I have two reverse proxies and they renew their certificates themselves.
ZFS send to a pair of mirrored HDDs on the same machine ever hour and a daily restic backup to S3 storage. Every six months I test and verify the cloud backup.
In addition to what you mentioned, setup logcheck to email you unexpected logs. It does require a bit of time and fine tuning to make it ignore expected logs, but in terms of security measures it’s very powerful. I get an email every time I log in, incorrectly type my sudo password, etc. Sounds very verbose, but it also means it’s verbose when something unexpected is happening which is what you want security-wise. A nice side effect of having to craft the regexes of what logs to ignore is that I know better what’s running on my server :)
I already posted that I recommend fastmail elsewhere in this thread, but you raised so many good points that it reminded me of some extra points :)
Fastmail offers granular, per-app passwords – I have a single password which has read-only access to IMAP in order to back up all the data on a timer. This feature is missing from many (many) other email providers - using the 80/20 rule, if they even offer it it’s a single password with full access (Mailfence, for example)
Since this community is about selfhosting I think it’s worth pointing out that this is AMAZING for selfhosting. I have all me selfhosted services sending e-mail via fastmail’s SMTP. With per-app passwords I don’t need to store my normal e-mail password and the apps can be limited to SMTP only (so no read access). And in case of compromise you can revoke permissions on a per-app granularity.
Fastmail offers full CardDAV (contacts) and CalDAV (calendar) access, which makes plugging it into any other app that supports this very easy - their DNS wizard helps you set up the service records. I use “DavX5” on my Android to sync all Contacts and Calendar outside of using the Fastmail app (which is a self contained app on Android, it’s not too bad)
Fastmail has become my contacts app now - it’s really great to have all your e-mail and contacts in the same place. The contacts don’t even need to have an e-mail address - I have a lot of contacts stored for whom I only have a phone number. I sync to android using the same DavX5 app and then immediately have these contacts in whatsapp and signal.
I recommend fastmail.com though they do have done shortcomings that you need to consider such as the fact that they’re based in Australia (five eyes country) and have servers in the USA. Their advantage is a slick interface, fantastic app based on JMAP, and just generally being super convenient. They allow catch all addresses, masked emails, custom domain etc. I find them super convenient.
Thanks for the suggestion! That is also doable with Nginx’s SSL pass-through. However, that is still vulnerable to the VPS provider obtaining a certificate. But indeed, it does appear that a combination of redirecting encrypted traffic (SSL passthrough or iptables) with cert monitoring appears to be emerging as a solution.
BTW, I prefer SSL pass-through over iptables, because I do keep one endpoint on the VPS and that’s my static website which also needs a cert. With SSL pass-through I can terminate connections to the static website while redirecting all other connections as it can pre-read the destination domain. With iptables I would need two IP addresses to distinguish the connections.
You can limit which CA’s will offer certificates for your domain with the CAA record in DNS.
Yea, I already have that.
You can also at least detect if someone else creates a certificate for your domain if you watch the certificate transparency logs.
Did not know this before today, but now I have it switched on!
Logcheck. It took ages to make sure innocent logs are ignored, but now I get an email as soon as anything non-routine happens on my servers. I get emails with logs from every update, every time I log in, etc. This has given me the most confidence that nothing unexpected is happening on my servers. Of course, one needs to make sure that the firewall is configured well, and that you use ssh keys etc., but logcheck is how I know I’m doing enough.