openstack-manuals/doc/install-guide/section_cinder-storage-node.xml

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  version="5.0"
  xml:id="cinder-install-storage-node">
  <?dbhtml stop-chunking?>
  <title>Install and configure a storage node</title>
  <para>This section describes how to install and configure storage nodes
    for the Block Storage service. For simplicity, this configuration
    references one storage node with an empty local block storage device
    <literal>/dev/sdb</literal> that contains a suitable partition table with
    one partition <literal>/dev/sdb1</literal> occupying the entire device.
    The service provisions logical volumes on this device using the
    <glossterm>LVM</glossterm> driver and provides them to instances via
    <glossterm baseform="Internet Small Computer Systems Interface (iSCSI)"
    >iSCSI</glossterm> transport. You can follow these instructions with
    minor modifications to horizontally scale your environment with
    additional storage nodes.</para>
  <procedure>
    <title>To configure prerequisites</title>
    <para>You must configure the storage node before you install and
      configure the volume service on it. Similar to the controller node,
      the storage node contains one network interface on the
      <glossterm>management network</glossterm>. The storage node also
      needs an empty block storage device of suitable size for your
      environment. For more information, see
      <xref linkend="ch_basic_environment"/>.</para>
    <step>
      <para>Configure the management interface:</para>
      <para>IP address: 10.0.0.41</para>
      <para>Network mask: 255.255.255.0 (or /24)</para>
      <para>Default gateway: 10.0.0.1</para>
    </step>
    <step>
      <para>Set the hostname of the node to
        <replaceable>block1</replaceable>.</para>
    </step>
    <step>
      <para>Copy the contents of the <filename>/etc/hosts</filename> file from
        the controller node to the storage node and add the following
        to it:</para>
      <programlisting language="ini"># block1
10.0.0.41       block1</programlisting>
      <para>Also add this content to the <filename>/etc/hosts</filename> file
        on all other nodes in your environment.</para>
    </step>
    <step>
      <para>Install and configure
        <glossterm baseform="Network Time Protocol (NTP)">NTP</glossterm>
        using the instructions in
        <xref linkend="basics-ntp-other-nodes"/>.</para>
    </step>
    <step>
      <para>Install the LVM packages:</para>
      <screen os="ubuntu;debian"><prompt>#</prompt> <userinput>apt-get install lvm2</userinput></screen>
      <screen os="rhel;centos;fedora"><prompt>#</prompt> <userinput>yum install lvm2</userinput></screen>
       <note>
         <para>Some distributions include LVM by default.</para>
       </note>
    </step>
    <step os="rhel;centos;fedora">
      <para>Start the LVM metadata service and configure it to start when the
        system boots:</para>
      <screen><prompt>#</prompt> <userinput>systemctl enable lvm2-lvmetad.service</userinput>
<prompt>#</prompt> <userinput>systemctl start lvm2-lvmetad.service</userinput></screen>
    </step>
    <step>
      <para>Create the LVM physical volume <literal>/dev/sdb1</literal>:</para>
      <screen><prompt>#</prompt> <userinput>pvcreate /dev/sdb1</userinput>
<computeroutput>  Physical volume "/dev/sdb1" successfully created</computeroutput></screen>
      <note>
        <para>If your system uses a different device name, adjust these
          steps accordingly.</para>
      </note>
    </step>
    <step>
      <para>Create the LVM volume group
        <literal>cinder-volumes</literal>:</para>
      <screen><prompt>#</prompt> <userinput>vgcreate cinder-volumes /dev/sdb1</userinput>
<computeroutput>  Volume group "cinder-volumes" successfully created</computeroutput></screen>
      <para>The Block Storage service creates logical volumes in this
        volume group.</para>
    </step>
    <step>
      <para>Only instances can access Block Storage volumes. However, the
        underlying operating system manages the devices associated with
        the volumes. By default, the LVM volume scanning tool scans the
        <literal>/dev</literal> directory for block storage devices that
        contain volumes. If tenants use LVM on their volumes, the scanning
        tool detects these volumes and attempts to cache them which can cause
        a variety of problems with both the underlying operating system
        and tenant volumes. You must reconfigure LVM to scan only the devices
        that contain the <literal>cinder-volume</literal> volume group. Edit
        the <filename>/etc/lvm/lvm.conf</filename> file and complete the
        following actions:</para>
      <substeps>
        <step>
          <para>In the <literal>devices</literal> section, add a filter
            that accepts the <literal>/dev/sdb</literal> device and rejects
            all other devices:</para>
          <programlisting language="ini">devices {
...
filter = [ "a/sdb/", "r/.*/"]</programlisting>
          <para>Each item in the filter array begins with <literal>a</literal>
            for <emphasis>accept</emphasis> or <literal>r</literal> for
            <emphasis>reject</emphasis> and includes a regular expression
            for the device name. The array must end with
            <literal>r/.*/</literal> to reject any remaining
            devices. You can use the <command>vgs -vvvv</command>
            command to test filters.</para>
          <warning>
            <para>If your storage nodes use LVM on the operating system disk,
              you must also add the associated device to the filter. For
              example, if the <literal>/dev/sda</literal> device contains
              the operating system:</para>
            <programlisting language="ini">filter = [ "a/sda/", "a/sdb/", "r/.*/"]</programlisting>
            <para>Similarly, if your compute nodes use LVM on the operating
              system disk, you must also modify the filter in the
              <literal>/etc/lvm/lvm.conf</literal> file on those nodes to
              include only the operating system disk. For example, if the
              <literal>/dev/sda</literal> device contains the operating
              system:</para>
            <programlisting language="ini">filter = [ "a/sda/", "r/.*/"]</programlisting>
          </warning>
        </step>
      </substeps>
    </step>
  </procedure>
  <procedure os="ubuntu;rhel;centos;fedora;sles;opensuse">
    <title>Install and configure Block Storage volume components</title>
    <step>
      <para>Install the packages:</para>
      <screen os="ubuntu"><prompt>#</prompt> <userinput>apt-get install cinder-volume python-mysqldb</userinput></screen>
      <screen os="rhel;centos;fedora"><prompt>#</prompt> <userinput>yum install openstack-cinder targetcli python-oslo-db MySQL-python</userinput></screen>
      <screen os="sles;opensuse"><prompt>#</prompt> <userinput>zypper install openstack-cinder-volume tgt python-mysql</userinput></screen>
    </step>
    <step>
      <para>Edit the <filename>/etc/cinder/cinder.conf</filename> file
        and complete the following actions:</para>
      <substeps>
        <step>
          <para>In the <literal>[database]</literal> section, configure
            database access:</para>
          <programlisting language="ini">[database]
...
connection = mysql://cinder:<replaceable>CINDER_DBPASS</replaceable>@<replaceable>controller</replaceable>/cinder</programlisting>
          <para>Replace <replaceable>CINDER_DBPASS</replaceable> with
            the password you chose for the Block Storage database.</para>
        </step>
        <step>
          <para>In the <literal>[DEFAULT]</literal> section, configure
            <application>RabbitMQ</application> message broker access:</para>
          <programlisting language="ini">[DEFAULT]
...
rpc_backend = rabbit
rabbit_host = <replaceable>controller</replaceable>
rabbit_password = <replaceable>RABBIT_PASS</replaceable></programlisting>
          <para>Replace <replaceable>RABBIT_PASS</replaceable> with the
            password you chose for the <literal>guest</literal> account in
            RabbitMQ.</para>
        </step>
        <step>
          <para>In the <literal>[DEFAULT]</literal> and
            <literal>[keystone_authtoken]</literal> sections,
            configure Identity service access:</para>
          <programlisting language="ini">[DEFAULT]
...
auth_strategy = keystone

[keystone_authtoken]
...
auth_uri = http://<replaceable>controller</replaceable>:5000/v2.0
identity_uri = http://<replaceable>controller</replaceable>:35357
admin_tenant_name = service
admin_user = cinder
admin_password = <replaceable>CINDER_PASS</replaceable></programlisting>
          <para>Replace <replaceable>CINDER_PASS</replaceable> with the
            password you chose for the <literal>cinder</literal> user in the
            Identity service.</para>
          <note>
            <para>Comment out any <literal>auth_host</literal>,
              <literal>auth_port</literal>, and
              <literal>auth_protocol</literal> options because the
              <literal>identity_uri</literal> option replaces them.</para>
          </note>
        </step>
        <step>
          <para>In the <literal>[DEFAULT]</literal> section, configure the
            <literal>my_ip</literal> option:</para>
          <programlisting language="ini">[DEFAULT]
...
my_ip = <replaceable>MANAGEMENT_INTERFACE_IP_ADDRESS</replaceable></programlisting>
          <para>Replace
            <replaceable>MANAGEMENT_INTERFACE_IP_ADDRESS</replaceable> with
            the IP address of the management network interface on your
            storage node, typically 10.0.0.41 for the first node in the
            <link linkend="architecture_example-architectures">example
            architecture</link>.</para>
        </step>
        <step>
          <para>In the <literal>[DEFAULT]</literal> section, configure the
            location of the Image Service:</para>
          <programlisting language="ini">[DEFAULT]
...
glance_host = <replaceable>controller</replaceable></programlisting>
        </step>
        <step os="rhel;centos;fedora">
          <para>In the <literal>[DEFAULT]</literal> section, configure Block
            Storage to use the <command>lioadm</command> iSCSI
            service:</para>
          <programlisting language="ini">[DEFAULT]
...
iscsi_helper = lioadm</programlisting>
        </step>
        <step>
          <para>(Optional) To assist with troubleshooting,
            enable verbose logging in the <literal>[DEFAULT]</literal>
            section:</para>
          <programlisting language="ini">[DEFAULT]
...
verbose = True</programlisting>
        </step>
      </substeps>
    </step>
  </procedure>
  <procedure os="debian">
    <title>Install and configure Block Storage volume components</title>
    <step>
      <para>Install the packages:</para>
      <screen><prompt>#</prompt> <userinput>apt-get install cinder-volume python-mysqldb</userinput></screen>
    </step>
    <step>
      <para>Respond to the prompts for
        <link linkend="debconf-dbconfig-common">database management</link>,
        <link linkend="debconf-keystone_authtoken">Identity service
        credentials</link>,
        <link linkend="debconf-api-endpoints">service endpoint
        registration</link>, and
        <link linkend="debconf-rabbitmq">message broker
        credentials.</link>.</para>
    </step>
    <step>
      <para>Respond to prompts for the volume group to associate with the
        Block Storage service. The script scans for volume groups and
        attempts to use the first one. If your system only contains the
        <literal>cinder-volumes</literal> volume group, the script should
        automatically choose it.</para>
    </step>
  </procedure>
  <procedure>
    <title>To finalize installation</title>
    <step os="ubuntu;debian">
      <para>Restart the Block Storage volume service including its
        dependencies:</para>
      <screen><prompt>#</prompt> <userinput>service tgt restart</userinput>
<prompt>#</prompt> <userinput>service cinder-volume restart</userinput></screen>
    </step>
    <step os="rhel;centos;fedora;sles;opensuse">
      <para>Start the Block Storage volume service including its dependencies
        and configure them to start when the system boots:</para>
      <screen><prompt>#</prompt> <userinput>systemctl enable openstack-cinder-volume.service target.service</userinput>
<prompt>#</prompt> <userinput>systemctl start openstack-cinder-volume.service target.service</userinput></screen>
      <para os="sles">On SLES:</para>
      <screen os="sles"><prompt>#</prompt> <userinput>service tgtd start</userinput>
<prompt>#</prompt> <userinput>chkconfig tgtd on</userinput>
<prompt>#</prompt> <userinput>service openstack-cinder-volume start</userinput>
<prompt>#</prompt> <userinput>chkconfig openstack-cinder-volume on</userinput></screen>
      <para os="opensuse">On openSUSE:</para>
      <screen os="opensuse"><prompt>#</prompt> <userinput>systemctl enable openstack-cinder-volume.service tgtd.service</userinput>
<prompt>#</prompt> <userinput>systemctl start openstack-cinder-volume.service tgtd.service</userinput></screen>
    </step>
    <step os="ubuntu">
      <para>By default, the Ubuntu packages create an SQLite database.
        Because this configuration uses a SQL database server, remove
        the SQLite database file:</para>
      <screen><prompt>#</prompt> <userinput>rm -f /var/lib/cinder/cinder.sqlite</userinput></screen>
    </step>
  </procedure>
</section>