jeltsch's blog

Mounting lvm2 manually

All commands as sudo:
vgscan (--mknodes)
vgchange -ay (volumegroupname)
(lvdisplay or lvs or ls -l /dev/volumegroupname/)
mkdir -vp $PATH/{home,root} (to make a moint point)
mount /dev/volumegroupname/home $PATH/home
mount /dev/volumegroupname/root $PATH/root
(ls -al $PATH/home)


How to enable passwordless logins to a server

  1. Enable root login with password on the server. To do so, you need to edit the file /etc/ssh/sshd_config.
    Modify the lines starting with "PermitRootLogin" like this:
    #PermitRootLogin prohibit-password
    PermitRootLogin yes
  2. Restart the sshd server:
    sudo systemctl restart sshd
  3. On the client, copy the public key files to the server with the ssh-copy-id command:
    ssh-copy-id root@server
  4. On the server, disable root login with password and enable root login with public key authentication:

Ubuntu 18.04 boot messages

After switching computers (but staying on the same version of Ubuntu), I copied my openvpn configuration (/etc/openvpn) to the new system. And when I booted next time, I received a weird request during boot to type in my username and password. There was no mentioning for what purpose, so I had to guess. Additionally, there is a bug that required me to press twice the Enter key after the username and password. It appeared to be openvpn, which tried - by default - to start up all openvpn configurations that it could find in /etc/openvpn.