KVM - Linux kernel virtualization manager

• Links: docker containers

• 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

    • # Add groups to the system
      # The following example adds the ubuntu group with members 'root' and 'sys'
      # and the empty group cloud-users.
      groups:
        - ubuntu: [root,sys]
        - cloud-users
      
      # Add users to the system. Users are added after groups are added.
      users:
        - default
        - name: vagrant
          password: vagrant   
          chpasswd: { expire: False }
          gecos: Default dev username vagrant
          primary-group: vagrant
          groups: users, sudo
          #selinux-user: staff_u
          #expiredate: 2012-09-01
          ssh-import-id: vagrant
          ssh_pwauth: True
          lock_passwd: false
          passwd: vagrant

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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