KVM - Linux kernel virtualization manager

• Links: docker containers, Linux/Bridge

• Similar in function to VMware, it uses linux as a hypervisor for guest virtual machines.
• Makes use of hardware virtualization built into most CPU's.
• Gui - Virtual Machine Manager

• Memory dedup with KSM

  • Monitor ksm with

    •      watch -d "tail  /sys/kernel/mm/ksm/* | sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'"

Storage virsh/kvm

• Disk storage is a pool, volumes is created from the pool and assigned to individual VM's.

  •  virsh vol-list default 

Ubuntu cloud images on KVM

• Need a config iso to configure user and ssh keys on boot

  •  sudo apt install cloud-image-utils 

  • Setup config file, must start with #cloud-config, file name: ubuntu-cloudimg-seed.txt

    • #cloud-config
      output: {all: '| tee -a /var/log/cloud-init-output.log'}
      password: ubuntu
      chpasswd: { expire: False }
      ssh_pwauth: True
      ssh_authorized_keys:
       - ssh-rsa AAAAxxxxxxxxxxxxx
      
      # Add users to the system. Users are added after groups are added.
      #  - default = the 'ubuntu' user in addition to other users
      users:
        - default
        - name: vagrant
          passwd: $6$vxxxxx<hash generated see comment below>xxxxxx
          ### python3 -c 'import crypt,getpass; print(crypt.crypt(getpass.getpass(), crypt.mksalt(crypt.METHOD_SHA512)))'
          lock-passwd: False 
          chpasswd: { expire: False }
          gecos: Default dev username vagrant
          primary-group: vagrant
          groups: sudo
          #selinux-user: staff_u
          #expiredate: 2012-09-01
          #ssh-import-id: vagrant
          ssh_pwauth: True
      
      write_files:
        - path: /test-pes-create.txt
          content: |
            Here is a line.
            Another line is here.
      
      runcmd:
        - touch /test-pes.txt

    • now use cloud-localds to create a iso/cdrom file to boot the ubuntu-cloud image with, the iso contains the config

      •  cloud-localds -vv ~/seed00.img ubuntu-cloudimg-seed.txt 

VBox - Oracle virtual box

• Create physical disk drive

  •  \Program Files\Oracle\VirtualBox\VBoxManage.exe" internalcommands createrawvmdk -filename "C:\Users\<user_name>\VirtualBox VMs\<VM_folder_name>\<file_name>.vmdk" -rawdisk \\.\PhysicalDrive# 

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