Synnefo » snf-ganeti » ganeti-local

    <refsect2>

      <title>COMMAND</title>

      <cmdsynopsis>

        <command>command</command>

        <arg>-n <replaceable>node</replaceable></arg>

        <arg choice="req"><replaceable>command</replaceable></arg>

      </cmdsynopsis>

      <para>

        Executes a command on all nodes. If the option

        <option>-n</option> is not given, the command will be executed

        on all nodes, otherwise it will be executed only on the

        node(s) specified. Use the option multiple times for running

        it on multiple nodes, like:

        <screen>

          # gnt-cluster command -n node1.example.com -n node2.example.com date

        </screen>

      </para>

      <para>

        The command is constructed by concatenating all other command

        line arguments. For example, to list the contents of the

        <filename class="directory">/etc</filename> directory on all

        nodes, run:

        <screen>

          # gnt-cluster command ls -l /etc

        </screen>

        and the command which will be executed will be

        <computeroutput>"ls -l /etc"</computeroutput>

      </para>

    </refsect2>

    <refsect2>

      <title>COPYFILE</title>

      <cmdsynopsis>

        <command>copyfile</command>

        <arg>-n <replaceable>node</replaceable></arg>

        <arg choice="req"><replaceable>file</replaceable></arg>

      </cmdsynopsis>

      <para>

        Copies a file to all or to some nodes. The argument specifies

        the source file (on the current system), the

        <option>-n</option> argument specifies the target node, or

        nodes if the option is given multiple times. If

        <option>-n</option> is not given at all, the file will be

        copied to all nodes.

        Example:

        <screen>

          # gnt-cluster -n node1.example.com -n node2.example.com copyfile /tmp/test

        </screen>

        This will copy the file <filename>/tmp/test</filename> from

        the current node to the two named nodes.

      </para>

    </refsect2>

    <refsect2>

      <title>DESTROY</title>

      <cmdsynopsis>

        <command>destroy</command>

      </cmdsynopsis>

      <para>

        Remove all configuration files related to the cluster, so that

        a <command>gnt-cluster init</command> can be done again

        afterwards.

      </para>

    </refsect2>

    <refsect2>

      <title>GETMASTER</title>

      <cmdsynopsis>

        <command>getmaster</command>

      </cmdsynopsis>

      <para>

        Displays the current master node.

      </para>

    </refsect2>

    <refsect2>

      <title>INFO</title>

      <cmdsynopsis>

        <command>info</command>

      </cmdsynopsis>

      <para>

        Shows runtime cluster information: cluster name, architecture

        (32 or 64 bit), master node, node list and instance list.

      </para>

    </refsect2>

    <refsect2>

      <title>INIT</title>

      <cmdsynopsis>

        <command>init</command>

        <arg>-s <replaceable>secondary_ip</replaceable></arg>

        <arg>-b <replaceable>bridge</replaceable></arg>

        <arg choice="req"><replaceable>clustername</replaceable></arg>

      </cmdsynopsis>

      <para>

        This commands is only run once initially on the first node of

        the cluster. It will initialize the cluster configuration and

        setup ssh-keys and more.

      </para>

      <para>

        Note that the <replaceable>clustername</replaceable> is not

        any random name. It has to be resolvable to an IP address

        using DNS, and it is best if you give the fully-qualified

        domain name.

      </para>

      <para>

        The cluster can run in two modes: single-home or

        dual-homed. In the first case, all traffic (both public

        traffic, inter-node traffic and data replication traffic) goes

        over the same interface. In the dual-homed case, the data

        replication traffic goes over the second network. The

        <option>-s</option> option here marks the cluster as

        dual-homed and its parameter represents this node's address on

        the second network. If you initialise the cluster with

        <option>-s</option>, all nodes added must have a secondary IP

        as well.

      </para>

      <para>

        Note that for Ganeti it doesn't matter if the secondary

        network is actually a separate physical network, or is done

        using tunneling, etc. For performance reasons, it's

        recommended to use a separate network, of course.

      </para>

      <para>

        The <option>-b</option> option specifies the default bridge

        for instances.

      </para>

    </refsect2>

    <refsect2>

      <title>MASTERFAILOVER</title>

      <cmdsynopsis>

        <command>masterfailover</command>

      </cmdsynopsis>

      <para>

        Failover the master role to the current node.

      </para>

    </refsect2>

    <refsect2>

      <title>RENAME</title>

      <cmdsynopsis>

        <command>rename</command>

        <arg>-f</arg>

        <arg choice="req"><replaceable>name</replaceable></arg>

      </cmdsynopsis>

      <para>

        Renames the cluster and in the process updates the master IP

        address to the one the new name resolves to. At least one of

        either the name or the IP address must be different, otherwise

        the operation will be aborted.

      </para>

      <para>

        Note that since this command can be dangerous (especially when

        run over SSH), the command will require confirmation unless

        run with the <option>-f</option> option.

      </para>

    </refsect2>

    <refsect2>

      <title>VERIFY</title>

      <cmdsynopsis>

        <command>verify</command>

      </cmdsynopsis>

      <para>

        Verify correctness of cluster configuration. This is safe with

        respect to running instances, and incurs no downtime of the

        instances.

      </para>

    </refsect2>

    <refsect2>

      <title>VERSION</title>

      <cmdsynopsis>

        <command>version</command>

      </cmdsynopsis>

      <para>

        Show the cluster version.

      </para>

    </refsect2>