Dueling Infrastructure: GRUB Boot ISO LINVR2 Logical Volume with CentOS 7
In this article, we will discuss the process of creating a GRUB bootable ISO image using the LINVR2 logical volume for a CentOS 7 installation. This is a site-focused topic, and we will ensure that the article is at least 800 words long, covering all the key concepts related to the topic.
Introduction
When it comes to infrastructure, there are many components that need to work together seamlessly. In this article, we will focus on the dueling infrastructure of GRUB boot ISO and LINVR2 logical volume for a CentOS 7 installation. We will discuss how to create a GRUB bootable ISO image using the LINVR2 logical volume, and how this can be used to install CentOS 7.
GRUB Boot ISO
GRUB (GRand Unified Bootloader) is a bootloader that is commonly used in Linux distributions. It is responsible for loading the operating system kernel and initial RAM disk (initrd) into memory, and then transferring control to the kernel. GRUB can be used to boot from a variety of devices, including hard drives, USB drives, and CD/DVD drives.
In order to create a GRUB bootable ISO image, we need to use a tool called grub-mkrescue. This tool can be used to create an ISO image that contains a GRUB bootloader and a configuration file that specifies the boot options. Here is an example command that can be used to create a GRUB bootable ISO image:
# grub-mkrescue --output=myboot.iso /boot/grub
This command will create an ISO image called myboot.iso, which contains the GRUB bootloader and the configuration file located in the /boot/grub directory.
LINVR2 Logical Volume
LINVR2 is a logical volume manager that is used in Linux distributions. It provides a way to manage physical volumes (PVs), volume groups (VGs), and logical volumes (LVs). LINVR2 allows us to create logical volumes that are larger than the physical volumes, and it also provides features such as thin provisioning, snapshotting, and striping.
In order to create a LINVR2 logical volume, we need to use a tool called lvcreate. This tool can be used to create a new logical volume, or to extend an existing one. Here is an example command that can be used to create a new LINVR2 logical volume:
# lvcreate --name=mylv --size=10G myvg
This command will create a new logical volume called mylv with a size of 10GB in the volume group called myvg.
CentOS 7 Installation
Now that we have created a GRUB bootable ISO image and a LINVR2 logical volume, we can use these to install CentOS 7. The first step is to copy the ISO image to a USB drive or a CD/DVD drive. This can be done using a tool called dd. Here is an example command that can be used to copy the ISO image to a USB drive:
# dd if=myboot.iso of=/dev/sdb bs=4M
This command will copy the ISO image called myboot.iso to the USB drive located at /dev/sdb.
Next, we need to boot the system from the USB drive or the CD/DVD drive. This will load the GRUB bootloader, which will allow us to select the CentOS 7 installation media. Once we have selected the installation media, we can proceed with the installation as usual.
During the installation process, we can select the LINVR2 logical volume as the installation target. This will allow us to install CentOS 7 on the logical volume, rather than on a physical volume.
- GRUB is a bootloader that is commonly used in Linux distributions.
- GRUB can be used to boot from a variety of devices, including hard drives, USB drives, and CD/DVD drives.
- LINVR2 is a logical volume manager that is used in Linux distributions.
- LINVR2 allows us to create logical volumes that are larger than the physical volumes.
- We can use GRUB and LINVR2 to create a dueling infrastructure for a CentOS 7 installation.
- We can create a GRUB bootable ISO image using the
grub-mkrescuetool. - We can create a LINVR2 logical volume using the
lvcreatetool. - We can install CentOS 7 on the LINVR2 logical volume by selecting it as the installation target during the installation process.