Installing a Vagrant BaseBox of CentOS

  • Install a minimal system of CentOS in VirtualBox
  • Activate networking on boot by enabling eth0 in
  • Add a vagrant user and assign the password vagrant to it
  • Give sudo rights to that user by adding vagrant ALL=(ALL) NOPASSWD: ALL with visudo
  • Disable requirement of having a TTY by commenting out the following settings with visudo:
  • Add insecure Vagrant public key from to vagrant’s authorized_keys
  • Add development tools for building the guest addons with
    The repo options are useful if you want to install from local installation media (ISOs) instead of fetching all from the net.
  • Install guest addons with
  • halt the machine
  • Remove all hardware that is not necessary from the base machine or else it will be available on the machines set up with Vagrant later!
  • Package Box with


Should Vagrant be unable to connect to your boxes derived from that base box, you might have a problem with SELinux, see here how this can be fixed!

SSH doesn’t allow logins with keys? SELinux!

If you have correctly setup your authorized_keys and are sure it should allow you logins with keys – then maybe SELinux is giving you a hard time. Especially if your user is not under the normal home directory folder /home. In your /var/log/{auth,secure} files you will see that sshd is not allowed to open authorized_keys and/or authorized_keys2 after you set the “LogLevel DEBUG” in /etc/ssh/sshd_config.

In that case, try to set the correct settings again:

chcon -t ssh_home_t ~PROBLEMATIC_USER/.ssh/
chcon -t ssh_home_t ~PROBLEMATIC_USER/.ssh/authorized_keys

Now everything will work again.

Charge HP Stream 7 while using it with an OTG cable

After a quite frustrating experience with an HP Stream 7 tablet, which refused to get charged while having a USB stick connected to it via an OTG cable, I found an extremly easy solution:

Just disable the Microsoft AC Power Supply which can be found in the device manager under Batteries.

Voila – that’s it.

I have the German version only where it says Microsoft Ladeger├Ąt and can be found under Akkus.