User mode linux install

How To Install usermode on Ubuntu 20.04

In this tutorial we learn how to install usermode on Ubuntu 20.04.

What is usermode

The usermode package contains several graphical tools for users: userinfo, usermount and userpasswd. Userinfo allows users to change their finger information. Usermount lets users mount, unmount, and format filesystems. Userpasswd allows users to change their passwords.

Install the usermode package if you would like to provide users with graphical tools for certain account management tasks.

There are three methods to install usermode on Ubuntu 20.04. We can use apt-get , apt and aptitude . In the following sections we will describe each method. You can choose one of them.

Install usermode Using apt-get

Update apt database with apt-get using the following command.

After updating apt database, We can install usermode using apt-get by running the following command:

Install usermode Using apt

Update apt database with apt using the following command.

After updating apt database, We can install usermode using apt by running the following command:

Install usermode Using aptitude

If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.

After updating apt database, We can install usermode using aptitude by running the following command:

How To Uninstall usermode on Ubuntu 20.04

To uninstall only the usermode package we can use the following command:

Uninstall usermode And Its Dependencies

To uninstall usermode and its dependencies that are no longer needed by Ubuntu 20.04, we can use the command below:

Remove usermode Configurations and Data

To remove usermode configuration and data from Ubuntu 20.04 we can use the following command:

Remove usermode configuration, data, and all of its dependencies

We can use the following command to remove usermode configurations, data and all of its dependencies, we can use the following command:

References

Summary

In this tutorial we learn how to install usermode package on Ubuntu 20.04 using different package management tools: apt , apt-get and aptitude .

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UserModeLinux

User-Mode Linux is another virtualisation technique for running VirtualMachines under GNU/Linux. A simplified version of the Linux kernel is run as a normal user-space process.

See the User-Mode Linux project page for more information.

This page will help you get started using User-Mode Linux with Ubuntu. Guide is created for Hardy LTS, but will most likely work with other releases.

Installing required packages

The first thing we need is to install the uml kernel and utilities we will need.

sudo apt-get install user-mode-linux uml-utilities bridge-utils debootstrap

Creating a virtual machine image

The next step is getting us a nice ubuntu hardy filesystem:

# Create an empty file to contain the root filesystem dd if=/dev/zero of=uml-root-hardy bs=4096 seek=1M count=1 # Create the filesystem on the file mkfs.xfs uml-root-hardy # Mount the filesystem sudo mount -o loop uml-root-hardy /mnt # Switch to root account for the rest sudo -i # Install a base system on the mounted partition. Use i386 or amd64 for the --arch option debootstrap --arch amd64 hardy /mnt http://us.archive.ubuntu.com/ubuntu # Create an fstab file echo "/dev/ubd0 / xfs defaults 0 1" > /mnt/etc/fstab echo "proc /proc proc defaults 0 0" >> /mnt/etc/fstab # Create the device file for the root file system and configure permissions mknod --mode=660 /mnt/dev/ubd0 b 98 0 chown root:disk /mnt/dev/ubd0 # Create a hosts file echo "127.0.0.1 localhost" > /mnt/etc/hosts # Configure network interfaces: eth0 using dhcp echo "auto lo" > /mnt/etc/network/interfaces echo "iface lo inet loopback" >> /mnt/etc/network/interfaces echo "auto eth0" >> /mnt/etc/network/interfaces echo "iface eth0 inet dhcp" >> /mnt/etc/network/interfaces # Add first terminal and serial terminal to secure list echo "tty0" >> /mnt/etc/securetty echo "ttys/0" >> /mnt/etc/securetty # Remove the other terminal events rm /mnt/etc/event.d/tty2 rm /mnt/etc/event.d/tty3 rm /mnt/etc/event.d/tty4 rm /mnt/etc/event.d/tty5 rm /mnt/etc/event.d/tty6 rm /mnt/etc/udev/rules.d/75-persistent-net-generator.rules # Return to normal account exit

Basically what we’ve done is created an empty filesystem, mounted it, and made some changes that we want done on all our VMs. Most of the commands need to be run as root using sudo in order to set the permissions correctly.

Running the VM

We should be ready to run our new VM now:

linux ubd0=uml-root-hardy.cow1,uml-root-hardy umid=uml1

Note: if your virtual machine crashes when mounting the root filesystem, the copy-on-write mechanism doesn’t work. Use the following command instead:

linux ubd0=uml-root-hardy umid=uml1

Networking

Just started

To have your UML talking to the rest of the world, you have some options and one would be to use a TAP-interface in the host-OS. This interface is created with the use of tunctl as in:

where uml-net is the user who should own the interface /dev/net/tun. It’s very important this user matches the one specified in /etc/default/uml-utilities or the network won’t work.

UserModeLinux (последним исправлял пользователь 217 2009-04-16 07:50:07)

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