How to make LUKS partition open only after network is up?

Question

Debian

Good afternoon.
There is Debian 10. LUKS section with a key in the form of a file. I want to host this key on a VPS and access it via NFS. How can this be implemented?
If you do it in the traditional way, this section does not open at startup, because. the service that does this does not see the key, because no network at this moment.

Answer 1

I understand what the problem is. I have NFS mount set up via autofs. If you transfer its mount to mount via fstab, then everything is ok. When loading, the nfs partition is mounted, luks is opened through the key from there, and this luks is already mounted via fstab. How can this be done via autofs mount?

Answer 2

if systemd, then write in the script the requirement of a working network
[Unit]
Wants=network-online.target
After=network-online.target
Another option is to put a dependency on nfs mounts
even better dependency on the existence of the path to the specified key file

Answer 3

In the startup script, put the dependency on the network service. How - depends on what you drive the system there.