Difference between revisions of "Vnx-rootfscentos"

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  vnx --create-rootfs vnx_rootfs_kvm_centos.qcow2 --install-cdrom /almacen/iso/CentOS-6.2-i386-bin-DVD1.iso --mem 768M
 
  vnx --create-rootfs vnx_rootfs_kvm_centos.qcow2 --install-cdrom /almacen/iso/CentOS-6.2-i386-bin-DVD1.iso --mem 768M
 
Note: around 768M of memory are needed to use the graphical installation assistant. With the textual assistant the memory requirements are lower (known to work with 512M).  
 
Note: around 768M of memory are needed to use the graphical installation assistant. With the textual assistant the memory requirements are lower (known to work with 512M).  
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<!--
 
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<li>Create a libvirt XML definition (rootfs_centos.xml) containing the virtual machine description:</li>
 
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<pre>
 
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<domain type='kvm'>
 
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  <name>CentOS</name>
 
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  <memory>524288</memory>
 
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  <vcpu>1</vcpu>
 
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  <os>
 
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    <type arch="i686">hvm</type>
 
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    <boot dev='hd'/>
 
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    <boot dev='cdrom'/>
 
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  </os>
 
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  <features>
 
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    <pae/>
 
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    <acpi/>
 
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    <apic/>
 
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  </features>
 
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  <clock sync="localtime"/>
 
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  <devices>
 
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    <emulator>/usr/bin/kvm</emulator>
 
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    <disk type='file' device='disk'>
 
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      <source file='/usr/share/vnx/filesystems/vnx_rootfs_centos-base.qcow2'/>
 
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      <target dev='hda'/>
 
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      <driver name="qemu" type="qcow2"/>
 
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    </disk>
 
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    <disk type='file' device='cdrom'>
 
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      <source file='/almacen/iso/CentOS-6.2-i386-bin-DVD1.iso'/>
 
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      <target dev='hdb'/>
 
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    </disk>
 
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    <interface type='network'>
 
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      <source network='default'/>
 
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    </interface>
 
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    <serial type="pty">
 
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      <target port="0"/>
 
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    </serial>
 
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    <console type="pty">
 
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      <target port="0"/>
 
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    </console>
 
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    <graphics type='vnc'/>
 
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  </devices>
 
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</domain>
 
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</pre>
 
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Note: change "source file=" lines to whatever fits your case (use full paths).
 
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<li>Start the virtual machine with:</li>
 
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virsh create rootfs_centos.xml
 
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<li>Access virtual machine console with:</li>
 
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virt-viewer CentOS
 
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-->
 
 
<li>Follow the CentOS installation assistant. At some point, you will have to choose among different system profiles: Desktop, Minimal Desktop, Minimal, Basic Server, etc.</li>
 
<li>Follow the CentOS installation assistant. At some point, you will have to choose among different system profiles: Desktop, Minimal Desktop, Minimal, Basic Server, etc.</li>
 
<!--ul>
 
<!--ul>
Line 72: Line 24:
  
 
<li>Once the installation is finished (the system will have to be rebooted to carry out the final steps), configure the serial console following these [http://blog.zelut.org/2010/05/05/configure-serial-console-access-on-centos-5/ instructions].</li>
 
<li>Once the installation is finished (the system will have to be rebooted to carry out the final steps), configure the serial console following these [http://blog.zelut.org/2010/05/05/configure-serial-console-access-on-centos-5/ instructions].</li>
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<li>Finally, delete the net udev rules file, halt the system and restart it with the following command:</li>
+
<li>Finally, delete the net udev rules file and halt the system:</li>
 
  rm /etc/udev/rules.d/70-persistent-net.rules
 
  rm /etc/udev/rules.d/70-persistent-net.rules
 +
halt
 +
</ul>
 +
 +
 +
== Configuration ==
 +
 +
Restart the system with the following command:
 
  vnx --modify-rootfs vnx_rootfs_kvm_centos.qcow2 --update-aced
 
  vnx --modify-rootfs vnx_rootfs_kvm_centos.qcow2 --update-aced
 
Note: ignore the errors "timeout waiting for response on VM socket".
 
Note: ignore the errors "timeout waiting for response on VM socket".
−
 
−
== Configuration ==
 
  
 
<ul>
 
<ul>

Revision as of 23:52, 20 May 2012

How to create a CentOS root filesystem for VNX

(being updated...do not use)

Basic installation

Follow this procedure to create a CentOS based root filesystem for VNX. The procedure has been tested with CentOS 6.2.

  • Create the filesystem disk image:
    • qemu-img create -f qcow2 vnx_rootfs_kvm_centos.qcow2 8GB
  • Get CentOS installation DVD (we recommend to use the complete DVD; the LiveDVD version does not include the customization menu to choose among different installation profiles: minimal, desktop, etc). For example:
    • wget ftp://ftp.rediris.es/mirror/CentOS/6.2/isos/i386/CentOS-6.2-i386-bin-DVD1.iso
cp CentOS-6.2-i386-bin-DVD1.iso /almacen/iso

    Note: latests versions of CentOS are distributed in two DVDs. However, only the first DVD is needed for basic installations; no need to download DVD2.

  • Create the virtual machine with:
    • vnx --create-rootfs vnx_rootfs_kvm_centos.qcow2 --install-cdrom /almacen/iso/CentOS-6.2-i386-bin-DVD1.iso --mem 768M

    Note: around 768M of memory are needed to use the graphical installation assistant. With the textual assistant the memory requirements are lower (known to work with 512M).

  • Follow the CentOS installation assistant. At some point, you will have to choose among different system profiles: Desktop, Minimal Desktop, Minimal, Basic Server, etc.
  • Once the installation is finished (the system will have to be rebooted to carry out the final steps), configure the serial console following these instructions.
  • Finally, delete the net udev rules file and halt the system:
    • rm /etc/udev/rules.d/70-persistent-net.rules
halt


Configuration

Restart the system with the following command: 

vnx --modify-rootfs vnx_rootfs_kvm_centos.qcow2 --update-aced

Note: ignore the errors "timeout waiting for response on VM socket".

  • Access the system through the text console to easy the copy-paste of commands:
    • virsh console vnx_rootfs_kvm_centos.qcow2
  • Check that you have network connectivity. Maybe you have to activate the network interface by hand:
    • dhclient eth1

    Note: use "ip link show" to know which network interface to use.

  • Configure the RPMForge repository following the procedure described here:
    • yum install wget
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.i686.rpm
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
rpm -K rpmforge-release-0.5.2-2.el6.rf.*.rpm
rpm -i rpmforge-release-0.5.2-2.el6.rf.*.rpm
  • Update the system and install additional packages
    • yum update
yum install perl perl-XML-DOM perl-XML-Parser acpid daemonize
  • Install VNX autoconfiguration daemon:
    • mount /dev/sdb /mnt/
perl /mnt/vnxaced-lf/install_vnxaced
  • Optionally:
    • Disable the services you are not going to use to speed up the virtual machine startup (you can see the list of active services with "chkconfig --list"). For example to disable sendmail and bluetooth:
      • chkconfig sendmail off
chkconfig bluetooth off
    • Disable the firewall. Firewall is enabled by default which could be problematic for testing purpose systems. If desired, disable it using the following command:
      • chkconfig iptables off
chkconfig ip6tables off
    • Create a file /etc/vnx_rootfs_version to store version number and informacion about modifications:
      • VER=v0.24
OS=CentOS 6.2
DESC=Basic CentOS 6.2 root-filesystem without GUI
    • Stop the machine with that script:
      • vnx_halt

    Installing additional software

    To install additional software or to modify your root file system, you just have to:

    • Start a virtual machine from it:
      • vnx --modify-rootfs vnx_rootfs_kvm_centos.qcow2
    • Check network connectivity. Maybe you have to activate the network interface by hand:
      • dhclient eth1

      Note: use "ip link show" to know which network interface to use.

    • Do the modifications you want.
    • Finally, halt the system using:
      • vnx_halt

      vnx_halt deletes some caches and log files and lets you write a short message to /etc/vnx_rootfs_version file describing the modifications done.

    Updating VNXACED

    You can automatically update the VNXACE daemon with the following command: 

    vnx --modify-rootfs vnx_rootfs_kvm_centos.qcow2 --update-aced -y

    Known issues

    • When executing commands using vnx "--exe" option in virtual machines configured with exec_mode="cdrom", traces like the followinf appear on the consoles:
      • hdb: tray open
end_request: I/O error, dev hdb, sector 8388352

      They are generated as a result of mount command execution by the VNX daemon. Commands are correctly executed. To be further investigated.

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