how do I setup a password on an existing container?

[bape]

Option 2 seems to be what I want

https://pmsl.com.ng/ssh-into-a-proxmox-lxc-container/

Do I change 109 to my container id?

lxc-attach --name 109

Do I have to add a username and password somewhere?

 

[leesteken]

You can also use pct enter CTID (where CTID is the number of your container) from the Proxmox host console/shell/ssh to enter the container as root (and then you can do whatever you want).

 

[bape]

You can also use pct enter CTID (where CTID is the number of your container) from the Proxmox host console/shell/ssh to enter the container as root (and then you can do whatever you want).

How can I then move files to the container?

 

[leesteken]

How can I then move files to the container?

Use a network connection (like SSH/SCP, SMB or NFS). Or use a mountpoint. Or mount the root of the container (when it's off). Here is the manual: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#chapter_pct