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How to modify first boot script in the TDN KVM template in SolusVM?

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Bato Tsydenov
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Applicable to:

  • SolusVM

Question

How to modify the first boot script in the TDN KVM template in SolusVM?

Answer

Warning: Modifying first boot template can break the template. Perform the modification with caution.

  1. Connect to the KVM Slave Node via SSH
  2. Open the firstboot script for editing with virt-edit utility and modify it in necessary way:

    # virt-edit -a <path-to-template> <path-to-firstboot-script>

    Replace <path-to-template> and <path-to-firstboot-script> with the actual path to corresponding template and firstboot script accordingly.
    All the templates are located at /home/solusvm/kvm/template

    <path-to-firstboot-script> depends on template OS.

    • For Ubuntu 20, Centos 7, Centos 8 and Almalinux 8:

      CONFIG_TEXT: /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f

    • for Ubuntu 18, Debian 9 and Debian 10:

      CONFIG_TEXT: /usr/lib/virt-sysprep/scripts/0001-mkswap--dev-vda2-update-initramfs--u-resize2fs--dev-vda1-apt

    Command examples:

    # virt-edit -a /home/solusvm/kvm/template/linux-debian-9-x86_64-minimal-latest.gz /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f
    # virt-edit -a /home/solusvm/kvm/template/linux-centos-8-x86_64-gen2-v1.gz /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f

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    Jonathan Hamon

    This is what I have in mine for Ubuntu 18.04 I was hoping it would update when it first boots but there are around 5 things that need user input so how do I fix this.

    mkswap /dev/vda2;update-initramfs -u;resize2fs /dev/vda1;apt-get update;apt-get upgrade -y;systemctl disable guestfs-firstboot;reboot

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    Jonathan Hamon

    what you need to do to get this to work with Ubuntu is enable non interactive mode so you will have a file like this

    swapoff /dev/vda2;mkswap /dev/vda2;update-initramfs -u;resize2fs /dev/vda1;DEBIAN_FRONTEND=noninteractive apt-get update -y;DEBIAN_FRONTEND=noninteractive apt-get dist-upgrade -y;systemctl disable guestfs-firstboot;reboot

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