Synnefo » snf-ganeti » ganeti-local

  - DRBD (kernel module and userspace utils), version 0.7.x or 8.0.x

  - mdadm (Linux Software Raid tools) (needed only with drbd 0.7.x)

Version 1.2b2

  - Change configuration file format from Python's Pickle to JSON.

  - Add support for DRBD 8.0 (new disk template `drbd`) which allows for

    faster replace disks and is more stable (DRBD 8 has many

    improvements compared to DRBD 0.7)

  - Added command line tags support (see man pages for gnt-instance,

    gnt-node, gnt-cluster)

  - Added instance rename support

  - Added multi-instance startup/shutdown

  - Added cluster rename support

  - Added `gnt-node evacuate` to simplify some node operations

  - Added instance reboot operation that can speedup reboot as compared

    to stop and start

  - Soften the requirement that hostnames are in FQDN format

  - The ganeti-watcher now activates drbd pairs after secondary node

    reboots

  - Removed dependency on debian's patched fping that uses the

    non-standard -S option

  - Now the OS definitions are searched for in multiple, configurable

    paths (easier for distros to package)

  - Some changes to the hooks infrastructure (especially the new

    post-configuration update hook)

  - Other small bugfixes

              valid for multi-node clusters using drbd 0.7.</simpara>

        <varlistentry>

          <term>drbd</term>

          <listitem>

            <simpara><emphasis role="strong">Note:</emphasis> This is only

              valid for multi-node clusters using drbd 8.0.</simpara>

            <simpara>

              This is similar to the

              <replaceable>remote_raid1</replaceable> option, but uses

              new features in drbd 8 to simplify the device

              stack. From a user's point of view, this will improve

              the speed of the <command>replace-disks</command>

              command and (in future versions) provide more

              functionality.

            </simpara>

          </listitem>

        </varlistentry>

        remote_raid1 or drbd disk templates:

        changing the secondary node. This is done in two ways, depending on the disk template type. For <literal>remote_raid1</literal>:

        <synopsis>gnt-instance replace-disks <option>-n <replaceable>NEW_SECONDARY</replaceable></option> <replaceable>INSTANCE_NAME</replaceable></synopsis>

        and for <literal>drbd</literal>:

        <synopsis>gnt-instance replace-disks <option>-s</option> <option>-n <replaceable>NEW_SECONDARY</replaceable></option> <replaceable>INSTANCE_NAME</replaceable></synopsis>

      <title>Instance OS definitions Debugging</title>

        Supported DRBD versions: the <literal>0.7</literal> series

        <emphasis role="strong">or</emphasis>

        <literal>8.0.x</literal>. It's recommended to have at least

        version <literal>0.7.24</literal> if you use

        <command>udev</command> since older versions have a bug

        related to device discovery which can be triggered in cases of

        hard drive failure.

        passes the following option to the module (for

        <literal>0.7.x</literal>:

        allow you to use up to 32 instances per node) or for

        <literal>8.0.x</literal> you can use up to

        <constant>255</constant>

        (i.e. <computeroutput>minor_count=255</computeroutput>, but

        for most clusters <constant>128</constant> should be enough).

      <para>or for using DRBD <literal>8.x</literal> from the etch

      backports:</para>

      <screen>

apt-get install -t etch-backports drbd8-module-source drbd8-utils

m-a update

m-a a-i drbd8

echo drbd minor_count=128 >> /etc/modules

modprobe drbd minor_count=128

      </screen>

        (<computeroutput>remote_raid1</computeroutput> for drbd 0.7

        and <computeroutput>drbd</computeroutput> for drbd 8.x).  All

        commands need to be executed on the Ganeti master node (the

        one on which <computeroutput>gnt-cluster init</computeroutput>

        was run).  Verify that the OS scripts are present on all

        cluster nodes with <computeroutput>gnt-os

        list</computeroutput>.

        to <literal>remote_raid1</literal> (drbd 0.7) or

        <literal>drbd</literal> (drbd 8.0) and specify the node on

        in <literal>remote_raid1</literal> or <literal>drbd</literal>

        disk templates), use <computeroutput>gnt-instance failover