Jumat, 17 Juni 2016

how-to-install-kvm-and-libvirt-on-centos-6.2-with-bridged-networking

Requirements

  • Hardware:
    • Processor with support for Intel-VT or AMD-V technology
    • Plenty RAM memory depending on the number of guests
    • Network connectivity
  • Software:
    • A previosly installed Linux CentOS 6.2 with a recent Linux kernel. On this how to:
      $ uname -r
      2.6.32-220.2.1.el6.x86_64
      $ lsb_release -a
      LSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
      Distributor ID: CentOS
      Description: CentOS release 6.2 (Final)
      Release: 6.2
      Codename: Final
    • A Linux client with a Desktop environment installed
    • An available CentOS mirror/repository

Installation Steps

  1. Log into the CentOS as bozz user (a sudoer user) and check if your hardware support for  virtualization extensions, on my hardware it was:
    2. $ egrep '^flags.*(vmx|svm)' /proc/cpuinfo
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
    flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid
  2. Install kvm and libvirt packages:
    $ sudo yum install kvm libvirt
  3. Update both packages to the latest version available on repositories/mirrors:
    $ sudo yum update libvirt kvm
    $ yum info libvirt
    Installed Packages
    Name        : libvirt
    Arch        : x86_64
    Version     : 0.9.4
    Release     : 23.el6_2.4
    $ yum info qemu-kvm
    Installed Packages
    Name        : qemu-kvm
    Arch        : x86_64
    Epoch       : 2
    Version     : 0.12.1.2
    Release     : 2.209.el6_2.1
  4. Restart the libvirtd daemon:
    $ sudo service libvirtd restart
  5. Verify if the kvm module is loaded, you should see amd or intel depending on the hardware:
    $ lsmod | grep kvm
    kvm_intel              50380  0
    kvm                   305113  1 kvm_intel
  6. Issue a virsh command to ensure local root connectivity first:
    $ sudo virsh sysinfo

    ...
  7. [OPTIONAL] To use KVM by a non-root user verify if kvm group was created on installation:
    $ cat /etc/group | grep kvm
    kvm:x:36:qemu
    Then add the bozz user to kvm group, so it can gain access to hypervisor:
    $ sudo usermod -a -G kvm bozz
    $ logout
    Login again as the bozz user and verify kvm's membership:
    $ id
    uid=500(bozz) gid=500(bozz) groups=500(bozz),10(wheel),36(kvm) context=...
    and verify if /dev/kvm is owned by group kvm:
    $ ls -l /dev/kvm
    crw-rw-rw-. 1 root kvm 10, 232 Jan 17 14:50 /dev/kvm
    On a system that runs udev, you will probably need to add the following line in your udev configuration so it will automatically give the right group to the newly created device:
    $ cat /etc/udev/rules.d/80-kvm.rules
    KERNEL=="kvm", GROUP="kvm", MODE="0666"
  8. To manage libvirt with a non-root account you should use PolicyKit. Define access control for a libvirt group:
    $ sudo groupadd libvirt
    $ sudo usermod -a -G libvirt bozz
    $ logout
    Login again as bozz user and edit a new archive:
    $ sudo nano /etc/polkit-1/localauthority/50-local.d/50-libvirt-remote-access.pkla
    with this content:
    [libvirt Management Access]
# For allowing access to specific user only:
#Identity=unix-user:bozz
# For allowing access to a group (like this guide):
Identity=unix-group:libvirt
Action=org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes
    Restart libvirtd daemon:
    $ sudo service libvirtd restart
    Verify if bozz user can locally access to qemu:///system (NOTE: the use of qemu:///session is discouraged):
    $ virsh -c qemu:///system sysinfo

    ...
    Verify if bozz user can remotely access to qemu+ssh://bozz@SERVER/system too. So on the Linux client issue:
    For Ubuntu client (like in this guide):
    $ sudo apt-get install libvirt-bin
    For CentOS client:
    $ sudo yum install libvirt
    Then:
    $ virsh -c qemu+ssh://bozz@SERVER/system sysinfo

    ...
    Change group ownership and permissions on the default images directory:
    $ sudo chown root:libvirt /var/lib/libvirt/images
    $ sudo chmod g+rw /var/lib/libvirt/images
  9. [OPTIONAL] When libvirtd (>= 0.9.3) is running as non-root it tries to read ~/.libvirt/libvirtd.conf (see here). A workaround is: 
    $ mkdir -p ~/.libvirt
    $ touch ~/.libvirt/libvirtd.conf
    Then issue a virsh command as bozz user:
    $ virsh list
     Id Name                 State
    ----------------------------------
  10. Configure Bridged Network by creating a new network script at /etc/sysconfig/network-scripts/ifcfg-br0:
    $ sudo nano /etc/sysconfig/network-scripts/ifcfg-br0
    and configuring the parameters according to your LAN settings (NOTE: options are case sensitive i.e. Bridge and bridge are two different options):
    DEVICE="br0"
TYPE=Bridge
DELAY=0
ONBOOT="yes"
BOOTPROTO=static
IPADDR=192.168.11.12
NETMASK=255.255.255.0
NETWORK=192.168.11.0
GATEWAY=192.168.11.1
DNS1=192.168.11.2
PEERDNS="yes"
NM_CONTROLLED=no
    Then edit the Ethernet network script /etc/sysconfig/network-scripts/ifcfg-eth0:
    $ sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0
    with the following content (NOTE: the hardware address depends on your NIC, an arbitrary MAC address is used here):
    DEVICE="eth0"
HWADDR="00:2C:C2:85:29:A3"
ONBOOT="yes"
BRIDGE=br0
NM_CONTROLLED=no
    Restart the networking service:
    $ sudo service network restart
    and verify the bridge config:
    $ brctl show
    bridge name bridge id STP enabled interfaces
    br0 8000.002cc28529a3 no eth0
    ...
    Configure iptables to allow all traffic to be forwarded across the bridge:
    $ sudo iptables -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT
    $ sudo service iptables save
    $ sudo service iptables restart
    Prevent bridged traffic from being processed by iptables rules, this improves the bridge’s performance. In /etc/sysctl.conf append the following lines:
    net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
    Reload the kernel parameters configured with sysctl:
    $ sudo sysctl -p /etc/sysctl.conf
    Restart the libvirt daemon:
    $ sudo service libvirtd reload



    Source :  www.howtoforge.com
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