Azure Classroom Series – 13/Aug/2020

Azure VM Images (Contd..)

• In Azure when we create vm’s we are given the option of setting user credentials, so vm image ideally should not have user credentials
• Before Creating VMImages we should remove user credentials, since we remove user credentials from the vm from which we create vm image the vm becomes unusable.
• In the case of Windows We remove user credentials using sysprep, in linux vm’s we deprovision using azure agent running on linux.
• The images created by removing user specific information are called as generalized images.
• Other Kinds of VM Images created by importing from virtual hard disks etc are called as specialized vm images.
• VM Image Creation can be automated using a tool called Packer.
• Lets create a VM Image with lamp stack and stress tool, just add this step to the steps used in previous session

sudo apt-get install stress -y

Azure Linux VM Provisioning

• When you create VM, you are allowed to pass parameters and setting to the VM, This is called as VM Provisioning.

• During VM Provisioning we set

  • hostname
  • username
  • password
  • SSH Keys
  • Custom data

• A provisioning agent inside the Azure linux vm is responsible for setting the parameters.

• The provisioning agents could be

  • Azure Linux Agent
  • Cloud-int

• After azure sets the above mentioned parameters (hostname, credentials, etc) it will run cloud-init.

• Provisioning Agents responsibilities

  • Image Provisioning
  • Networking
  • kernel
  • Diagnostics

Advanced Tab in VM Creation

• Screenshots for linux
• Screenshots for Windows

Azure VM Extensions

• Extensions are small applications that provide post-deployment configuration and automation on Azure VM’s
• Discovering Linux VM Extensions
• Discovering Windows VM Extensions