Ubuntu Configuration

This guide provides instructions for configuring Grub to support LXD and enabling root access without requiring a password. While enabling root access without a password is not strictly necessary, it can be helpful for convenience, especially on a development laptop.

Secure Boot

Make sure that Secure Boot is disabled.

Grub

Open the /etc/default/grub file using a text editor.

sudo nano /etc/default/grub

Find the line that starts with GRUB_CMDLINE_LINUX and modify it as follows:

GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0"

Save the file and exit the text editor. Update Grub to apply the changes.

sudo update-grub

Reboot your system for the changes to take effect.

sudo reboot

Without making this edit, the network on CentOS 7 boxes may not function correctly, and the containers may fail to obtain an IP address. If you encounter the following error message during Vagrant provisioning, this edit is necessary:

The container failed to acquire an IPv4 address within 30 seconds.

Enabling Root Access without Password

Some tasks require executing commands as the root user without entering a password. Follow these steps to enable root access without a password using the command below.

echo "$USER ALL=(ALL) NOPASSWD:ALL" |  sudo tee -a /etc/sudoers.d/$USER > /dev/null

Enabling root access without a password is particularly useful for tasks that run on localhost and require root privileges. However, exercise caution when granting such access and ensure that you understand the implications.