dushankw / bash-my-kvm

bash-my-kvm

Create various flavours of linux VMs in no time.

Currently only one command: kvm-guest-create

• Takes ~35 seconds from running script till SSH being available
• Amazon Linux 2, Fedora, Rocky Linux
• Guests findable by name from host and each other with zero config
• On first boot: - runs system update - installs tailscale

TODO

• bash completion on available distros
• fix ssh between guests (Add Tailscale domain to /etc/resolv.conf)

Usage

GUEST_NAME=grafana

export LIBVIRT_IMAGES_DIR=~/.libvirt/images # optional for non-root usage

sudo bin/kvm-guest-create "${GUEST_NAME}-amazon" amazon

Install Deps (fedora-36)

sudo yum install -y                \
      genisoimage                  \
      guestfs-tools                \
      libvirt                      \
      libvirt-client               \
      libvirt-dbus                 \
      policycoreutils-python-utils \
      qemu-kvm                     \
      virt-install                 \
      virt-manager                 \
      virt-viewer                  \

sudo systemctl enable --now libvirtd.service # required?

Configure

• Configure Rootless access
  • Use libvirt as non root user
  • Change default location for libvirt-images

Configure SSH key / password in config/user-data.

Optionally update the default username / password / SSH public key.

Make guests addressable by name from host by name

• Libvirt NSS module (libvirt.org)

Make guests addressable from host by name:

sudo yum install -y libvirt-nss ## RHEL/CentOS/Fedora ##
sudo apt install libnss-libvirt ## Debian/Ubuntu ##

Add libvirt libvirt_guest to hosts entry of nsswitch:

$ grep hosts /etc/nsswitch.conf
hosts:       files libvirt libvirt_guest dns

Create your kvm guest

bin/kvm-guest-create GUEST_NAME [GUEST_TYPE] # amzn2, fedora, rocky, etc

Working with your guests

Connect to guest console:

virsh console $GUEST_NAME

SSH to it's IP address (accessible by name from host or other guests):

ssh admin@$GUEST_NAME