Difference between revisions of "Vnx-rootfsfedora"

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{{Title|How to create a Fedora root filesystem for VNX}}
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{{Title|How to create a KVM Fedora root filesystem for VNX}}
  
−
(being updated...do not use...)
+
Follow this procedure to create a KVM Fedora based root filesystem for VNX. The procedure has been tested with Fedora 24, 20, 18, 16 and 14.
−
 
 
−
Follow this procedure to create a fedora based root filesystem for VNX. The procedure has been tested with Fedora 16 and 14.
 
  
 
== Basic installation ==
 
== Basic installation ==
 
<ul>
 
<ul>
 
<li>Create the filesystem disk image:</li>
 
<li>Create the filesystem disk image:</li>
−
  qemu-img create -f qcow2 vnx_rootfs_kvm_fedora.qcow2 8GB
+
  qemu-img create -f qcow2 vnx_rootfs_kvm_fedora.qcow2 20G
 
<li>Get Fedora installation DVD (use the complete DVD; do not use the Live version, as it seems the installation wizard does not include the customization menu). For example:</li>
 
<li>Get Fedora installation DVD (use the complete DVD; do not use the Live version, as it seems the installation wizard does not include the customization menu). For example:</li>
 
  wget ftp://ftp.rediris.es/mirror/fedora/16/Fedora/i386/iso/Fedora-16-i386-DVD.iso
 
  wget ftp://ftp.rediris.es/mirror/fedora/16/Fedora/i386/iso/Fedora-16-i386-DVD.iso
 
  cp Fedora-16-i386-DVD.iso /almacen/iso
 
  cp Fedora-16-i386-DVD.iso /almacen/iso
 
<li>Create the virtual machine with:</li>
 
<li>Create the virtual machine with:</li>
−
  vnx --create-rootfs vnx_rootfs_kvm_fedora.qcow2 --install-media /almacen/iso/Fedora-16-i686-Live-Desktop.iso --mem 768M
+
  vnx --create-rootfs vnx_rootfs_kvm_fedora.qcow2 --install-media /almacen/iso/Fedora-16-i386-DVD.iso --mem 768M
 +
Note: add '''"--arch x86_64"''' option for 64 bits virtual machines
 
<li>Follow the Fedora installation assistant. At some point, you will have to choose among different system profiles: desktop, web server, minimal, etc.</li>
 
<li>Follow the Fedora installation assistant. At some point, you will have to choose among different system profiles: desktop, web server, minimal, etc.</li>
 
<li>Enable login on the first serial line:</li>
 
<li>Enable login on the first serial line:</li>
 
<ul>
 
<ul>
 +
<li>Fedora 18, 20 and 24:</li>
 +
<ul>
 +
<li>Edit /etc/default/grub and add:</li>
 +
<pre>
 +
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8  net.ifnames=0 biosdevname=0"
 +
GRUB_TERMINAL="serial"
 +
GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1"
 +
</pre>
 +
<li>And afterwards execute:</li>
 +
grub2-mkconfig -o /boot/grub2/grub.cfg
 +
</ul>
 
<li>Fedora 16. Execute this command:</li>
 
<li>Fedora 16. Execute this command:</li>
 
  ln -s /usr/lib/systemd/system/getty@.service  /etc/systemd/system/getty.target.wants/getty@ttyS0.service
 
  ln -s /usr/lib/systemd/system/getty@.service  /etc/systemd/system/getty.target.wants/getty@ttyS0.service
Line 25: Line 35:
 
  respawn
 
  respawn
 
  exec /sbin/agetty /dev/ttyS0 9600 vt100-nav
 
  exec /sbin/agetty /dev/ttyS0 9600 vt100-nav
−
Besides, add ttyS0 to /etc/securetty file if you want to login root on that console:
+
And add ttyS0 to /etc/securetty file if you want to login root on that console:
 
  echo "ttyS0" >> /etc/securetty
 
  echo "ttyS0" >> /etc/securetty
−
 
 
</ul>
 
</ul>
 
<li>Finally, delete the net udev rules file and halt the system:</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
+
  halt -p
 
</ul>
 
</ul>
  
 
== Configuration ==
 
== Configuration ==
 
<ul>
 
<ul>
 +
<li>Restart the system with the following command:</li>
 +
vnx --modify-rootfs vnx_rootfs_kvm_fedora.qcow2 --update-aced --mem 768M
 +
Note: ignore the errors "timeout waiting for response on VM socket". 768M are needed if you are installing a root filesystem with desktop interface
 +
Note: add '''"--arch x86_64"''' option for 64 bits virtual machines
 +
<li>Access the system through the text console to easy the copy-paste of commands:</li>
 +
virsh console vnx_rootfs_kvm_fedora.qcow2
 +
<li>Check that you have network connectivity. Maybe you have to activate the network interface by hand:</li>
 +
dhclient eth0
 +
Note: use "ip link show" to know which network interface to use.
 
<li>Update the system and install additional packages</li>
 
<li>Update the system and install additional packages</li>
 
  yum update
 
  yum update
−
  yum install perl perl-XML-DOM acpid udisks
+
  yum install perl perl-XML-LibXML perl-NetAddr-IP acpid udisks perl-Sys-Syslog xterm
 
Note: if yum fails, check that the network is working. Maybe you will have to manually execute "dhclient eth0", at least in the case of a minimal installation.
 
Note: if yum fails, check that the network is working. Maybe you will have to manually execute "dhclient eth0", at least in the case of a minimal installation.
 
<li>Install VNX autoconfiguration daemon:</li>
 
<li>Install VNX autoconfiguration daemon:</li>
−
<ul>
+
mount /dev/sdb /mnt/
 +
perl /mnt/vnxaced-lf/install_vnxaced
 +
<li>Disable Network Manager to avoid problems with autoconfiguration daemon</li>
 +
systemctl stop NetworkManager.service
 +
systemctl disable NetworkManager.service
 +
systemctl enable network.service
 +
<!--ul>
 
<li>From the host execute:</li>
 
<li>From the host execute:</li>
 
  /usr/share/vnx/bin/vnx_update_aced Fedora /usr/share/vnx/aced/vnx-aced-lf-0.1b.tgz  
 
  /usr/share/vnx/bin/vnx_update_aced Fedora /usr/share/vnx/aced/vnx-aced-lf-0.1b.tgz  
Line 48: Line 72:
 
  udisks --mount /dev/sr0
 
  udisks --mount /dev/sr0
 
  perl /media/cdrom/install_vnxaced
 
  perl /media/cdrom/install_vnxaced
−
</ul>
+
</ul-->
 
<li>If you have chosen a "minimum installation", activate network services (they are disabled by default):</li>
 
<li>If you have chosen a "minimum installation", activate network services (they are disabled by default):</li>
 
  chkconfig --level 3 network on
 
  chkconfig --level 3 network on
Line 55: Line 79:
 
<li>Install other services needed, for example, an apache server:</li>
 
<li>Install other services needed, for example, an apache server:</li>
 
  yum install httpd
 
  yum install httpd
−
  update-rc.d -f apache2 remove  # to avoid automatic start
+
  chkconfig httpd off  # if you want to avoid automatic start of apache server
 
<li>Or, if using a "minumum installation", install network utilities:</li>
 
<li>Or, if using a "minumum installation", install network utilities:</li>
 
  yum install telnet wget openssh-clients
 
  yum install telnet wget openssh-clients
Line 62: Line 86:
 
  AutomaticLogin=vnx
 
  AutomaticLogin=vnx
 
<li>Disable the firewall. Firewall is enabled by default; that could be problematic for testing purpose systems. If desired, disable it graphically in "System|Administration|Firewall" option, or using the following command from the command line:</li>
 
<li>Disable the firewall. Firewall is enabled by default; that could be problematic for testing purpose systems. If desired, disable it graphically in "System|Administration|Firewall" option, or using the following command from the command line:</li>
 +
# Fedora 18
 +
chkconfig firewalld off
 +
 +
# Fedora 16 & 14
 
  chkconfig iptables off
 
  chkconfig iptables off
 +
chkconfig ip6tables off
 +
<li>Change grub timeout to 0 by editing /etc/default/grub file and setting:</li>
 +
GRUB_TIMEOUT=0
 +
and executing:
 +
grub2-mkconfig -o /boot/grub2/grub.cfg 
 +
<li>Disable screensaver if using a GUI.</li>
 
</ul>
 
</ul>
−
<li>Create a file /etc/vnx_rootfs_version to store version number and informacion about modification:</li>
+
<li>Create a file /etc/vnx_rootfs_version to store version number and informacion about modification. For example:</li>
−
<pre>
 
−
VER=v0.21
 
−
OS=Fedora 14
 
−
DESC=Basic Fedora 14 root-filesystem without GUI
 
−
</pre>
 
−
<li>Create a script named /usr/local/bin/vnx_halt:</li>
 
 
<pre>
 
<pre>
−
#!/bin/bash
+
VER=v0.25
−
# Clean yum cache
+
OS=Fedora 18
−
yum clean all
+
DESC=Basic Fedora 18 root-filesystem without GUI
−
# Delete /etc/resolv.conf
 
−
rm -f /etc/resolv.conf
 
−
# Clean command history
 
−
rm -f /root/.bash_history
 
−
# Delete udev net rules files:
 
−
rm -f /etc/udev/rules.d/70-persistent-net.rules
 
−
# Delete VNXACE log
 
−
rm -f /var/log/vnxaced.log
 
−
while true; do
 
−
    # Ask for a message to save in /etc/vnx_rootfs_version file
 
−
    echo    "** Save a log message in /etc/vnx_rootfs_version file "
 
−
    echo -n "** describing the modifications done? "
 
−
    read -n 1 -p "[y/n] " answer
 
−
    echo ""
 
−
    case $answer in
 
−
        [Yy]* )
 
−
                echo "** Log message (1 line maximum):"
 
−
                read logmsg
 
−
                DATE=`date`
 
−
                echo "MODDATE=$DATE" >> /etc/vnx_rootfs_version
 
−
                echo "MODDESC=$logmsg" >> /etc/vnx_rootfs_version
 
−
                break;;
 
−
        [Nn]* ) break;;
 
−
        * )    echo "** Error: please answer 'y' or 'n'.";;
 
−
    esac
 
−
done
 
−
# Halt the system
 
−
halt -p
 
 
</pre>
 
</pre>
−
<li>Give the script execution permissions:</li>
+
<li>Finally, stop the virtual machine with:</li>
−
chmod +x /usr/local/bin/vnx_halt
 
−
<li>Stop the machine with that script:</li>
 
 
  vnx_halt
 
  vnx_halt
−
</ul>
+
''vnx_halt'' deletes some caches and log files and optionally lets you write a short message to ''/etc/vnx_rootfs_version file'' describing the latest modifications done.</ul>
  
 
== Installing additional software ==
 
== Installing additional software ==
  
−
To install additional software or modify your root filesystem, you just have to start it as described above and make the operations required on the filesystem.
+
To install additional software or to modify your root file system, you just have to:
−
* Start the virtual machine (directly using virsh or the vnx_modify_rootfs utility):
+
<ul>
−
  /usr/share/vnx/bin/vnx_modify_rootfs rootfs_fedora.xml
+
<li>Start a virtual machine from it:</li>
−
* Install the software:
+
vnx --modify-rootfs vnx_rootfs_kvm_fedora.qcow2
−
  yum install ...
+
<li>Check network connectivity. Maybe you have to activate the network interface by hand:</li>
−
* Stop the machine with:
+
  dhclient eth1
 +
Note: use "ip link show" to know which network interface to use.
 +
<li>Do the modifications you want.</li>
 +
<li>Finally, halt the system using:</li>
 
  vnx_halt
 
  vnx_halt
 +
</ul>
 +
 +
== Updating VNXACED ==
 +
 +
You can automatically update the VNXACE daemon with the following command:
 +
vnx --modify-rootfs vnx_rootfs_kvm_fedora.qcow2 --update-aced -y
 +
If VNXACE daemon is not updated automatically, you can do it manually by accessing the virtual machine console and type:
 +
mount /dev/sdb /mnt/
 +
perl /mnt/vnxaced-lf/install_vnxaced
  
 
== Known problems ==
 
== Known problems ==

Latest revision as of 00:07, 3 November 2016

How to create a KVM Fedora root filesystem for VNX

Follow this procedure to create a KVM Fedora based root filesystem for VNX. The procedure has been tested with Fedora 24, 20, 18, 16 and 14.

Basic installation

  • Create the filesystem disk image:
    • qemu-img create -f qcow2 vnx_rootfs_kvm_fedora.qcow2 20G
  • Get Fedora installation DVD (use the complete DVD; do not use the Live version, as it seems the installation wizard does not include the customization menu). For example:
    • wget ftp://ftp.rediris.es/mirror/fedora/16/Fedora/i386/iso/Fedora-16-i386-DVD.iso
cp Fedora-16-i386-DVD.iso /almacen/iso
  • Create the virtual machine with:
    • vnx --create-rootfs vnx_rootfs_kvm_fedora.qcow2 --install-media /almacen/iso/Fedora-16-i386-DVD.iso --mem 768M

    Note: add "--arch x86_64" option for 64 bits virtual machines

  • Follow the Fedora installation assistant. At some point, you will have to choose among different system profiles: desktop, web server, minimal, etc.
  • Enable login on the first serial line:
    • Fedora 18, 20 and 24:
      • Edit /etc/default/grub and add:
        • GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8  net.ifnames=0 biosdevname=0"
GRUB_TERMINAL="serial"
GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1"
      • And afterwards execute:
        • grub2-mkconfig -o /boot/grub2/grub.cfg
    • Fedora 16. Execute this command:
      • ln -s /usr/lib/systemd/system/getty@.service   /etc/systemd/system/getty.target.wants/getty@ttyS0.service
    • Fedora 14. Create a file named /etc/init/serial-ttyS0.conf with the following content:
      • #This service maintains a getty on /dev/ttyS0.
start on stopped rc RUNLEVEL=[2345]
stop on starting runlevel [016]
respawn
exec /sbin/agetty /dev/ttyS0 9600 vt100-nav

      And add ttyS0 to /etc/securetty file if you want to login root on that console: 

      echo "ttyS0" >> /etc/securetty
  • Finally, delete the net udev rules file and halt the system:
    • rm /etc/udev/rules.d/70-persistent-net.rules
halt -p

Configuration

  • Restart the system with the following command:
    • vnx --modify-rootfs vnx_rootfs_kvm_fedora.qcow2 --update-aced --mem 768M

    Note: ignore the errors "timeout waiting for response on VM socket". 768M are needed if you are installing a root filesystem with desktop interface Note: add "--arch x86_64" option for 64 bits virtual machines

  • Access the system through the text console to easy the copy-paste of commands:
    • virsh console vnx_rootfs_kvm_fedora.qcow2
  • Check that you have network connectivity. Maybe you have to activate the network interface by hand:
    • dhclient eth0

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

  • Update the system and install additional packages
    • yum update
yum install perl perl-XML-LibXML perl-NetAddr-IP acpid udisks perl-Sys-Syslog xterm

    Note: if yum fails, check that the network is working. Maybe you will have to manually execute "dhclient eth0", at least in the case of a minimal installation.

  • Install VNX autoconfiguration daemon:
    • mount /dev/sdb /mnt/
perl /mnt/vnxaced-lf/install_vnxaced
  • Disable Network Manager to avoid problems with autoconfiguration daemon
    • systemctl stop NetworkManager.service 
systemctl disable NetworkManager.service
systemctl enable network.service
  • If you have chosen a "minimum installation", activate network services (they are disabled by default):
    • chkconfig --level 3 network on
  • Optionally:
    • Install other services needed, for example, an apache server:
      • yum install httpd
chkconfig httpd off  # if you want to avoid automatic start of apache server
    • Or, if using a "minumum installation", install network utilities:
      • yum install telnet wget openssh-clients
    • If you want automatic login, just edit /etc/gdm/custom.conf and add the following lines:
      • AutomaticLoginEnable=true
AutomaticLogin=vnx
    • Disable the firewall. Firewall is enabled by default; that could be problematic for testing purpose systems. If desired, disable it graphically in "System|Administration|Firewall" option, or using the following command from the command line:
      • # Fedora 18
chkconfig firewalld off

      # Fedora 16 & 14
chkconfig iptables off
chkconfig ip6tables off
    • Change grub timeout to 0 by editing /etc/default/grub file and setting:
      • GRUB_TIMEOUT=0

      and executing: 

      grub2-mkconfig -o /boot/grub2/grub.cfg
    • Disable screensaver if using a GUI.
  • Create a file /etc/vnx_rootfs_version to store version number and informacion about modification. For example:
    • VER=v0.25
OS=Fedora 18
DESC=Basic Fedora 18 root-filesystem without GUI
  • Finally, stop the virtual machine with:
    • vnx_halt
    vnx_halt deletes some caches and log files and optionally lets you write a short message to /etc/vnx_rootfs_version file describing the latest modifications done.

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_fedora.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

Updating VNXACED

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

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

If VNXACE daemon is not updated automatically, you can do it manually by accessing the virtual machine console and type: 

mount /dev/sdb /mnt/
perl /mnt/vnxaced-lf/install_vnxaced

Known problems

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