Installing Operating System from custom image on OVH VPS ( CentOS 8 Tutorial)

In theory this should work with any custom ISO, however I tested only with CentOS 8

**1) Reboot VPS in rescue mode**

**2) Connect to Rescue Mode via SSH, unmount /dev/sdb1 and remove all partitions:**

# lsblk
# umount /dev/sdb1
# fdisk -u /dev/sdb
> d
> d
> w

**3) Install required packages:**

`# apt install qemu-kvm`

**4) Download your ISO - usually Rescue Mode has very little space so you may want to download NetInst/Minimal ISO:**

`# wget http://mirror.ox.ac.uk/sites/mirror.centos.org/8.0.1905/isos/x86_64/CentOS-8-x86_64-1905-boot.iso`

**5) Run qemu (replace ISO location and vdisk name if required):**

`# qemu-system-x86_64 -netdev type=user,id=mynet0 -device virtio-net-pci,netdev=mynet0 -m 2048 -localtime -enable-kvm -drive index=0,media=disk,if=virtio,file=/dev/sdb -vga qxl -spice port=5900,addr=127.0.0.1,disable-ticketing -daemonize -cdrom /tmp/CentOS-8-x86_64-1905-boot.iso -boot d`

**6) Assuming your workstation is running Linux, forward a port through an SSH tunnel to your VPS:**

# ssh -4 -v root@ -L 5900:localhost:5900

**7) On your localhost, connect to SPICE running on local port 5900:**

# remote-viewer
> spice://127.0.0.1?port=5900

**8) Perform installation as usual.**

Note: Since you downloaded Minimal/NetInst image, you need to configure source installation.
For CentOS 8 I used:
> a) http
> b) repository URL
> c) mirror.centos.org/centos/8/BaseOS/x86_64/os/

**9) Reboot server and exit Rescue Mode.**

**10) Connect to your new instance running CentOS 8:**

# cat /etc/redhat-release
CentOS Linux release 8.0.1905 (Core)