Examples with VLAN com.xensource.xenapi.VLAN used on opensource projects

Example 1 with VLAN

use of com.xensource.xenapi.VLAN in project cloudstack by apache.

the class CitrixResourceBase method enableVlanNetwork.

/**
     * enableVlanNetwork creates a Network object, Vlan object, and thereby a
     * tagged PIF object in Xapi.
     *
     * In XenServer, VLAN is added by - Create a network, which is unique
     * cluster wide. - Find the PIF that you want to create the VLAN on. -
     * Create a VLAN using the network and the PIF. As a result of this
     * operation, a tagged PIF object is also created.
     *
     * Here is a list of problems with clustered Xapi implementation that we are
     * trying to circumvent. - There can be multiple Networks with the same
     * name-label so searching using name-label is not unique. - There are no
     * other ways to search for Networks other than listing all of them which is
     * not efficient in our implementation because we can have over 4000 VLAN
     * networks. - In a clustered situation, it's possible for both hosts to
     * detect that the Network is missing and both creates it. This causes a lot
     * of problems as one host may be using one Network and another may be using
     * a different network for their VMs. This causes problems in migration
     * because the VMs are logically attached to different networks in Xapi's
     * database but in reality, they are attached to the same network.
     *
     * To work around these problems, we do the following.
     *
     * - When creating the VLAN network, we name it as VLAN-UUID of the Network
     * it is created on-VLAN Tag. Because VLAN tags is unique with one
     * particular network, this is a unique name-label to quickly retrieve the
     * the VLAN network with when we need it again. - When we create the VLAN
     * network, we add a timestamp and a random number as a tag into the
     * network. Then instead of creating VLAN on that network, we actually
     * retrieve the Network again and this time uses the VLAN network with
     * lowest timestamp or lowest random number as the VLAN network. This allows
     * VLAN creation to happen on multiple hosts concurrently but even if two
     * VLAN networks were created with the same name, only one of them is used.
     *
     * One cavaet about this approach is that it relies on the timestamp to be
     * relatively accurate among different hosts.
     *
     * @param conn
     *            Xapi Connection
     * @param tag
     *            VLAN tag
     * @param network
     *            network on this host to create the VLAN on.
     * @return VLAN Network created.
     * @throws XenAPIException
     * @throws XmlRpcException
     */
protected Network enableVlanNetwork(final Connection conn, final long tag, final XsLocalNetwork network) throws XenAPIException, XmlRpcException {
    Network vlanNetwork = null;
    final String oldName = "VLAN" + Long.toString(tag);
    final String newName = "VLAN-" + network.getNetworkRecord(conn).uuid + "-" + tag;
    XsLocalNetwork vlanNic = getNetworkByName(conn, newName);
    if (vlanNic == null) {
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Couldn't find vlan network with the new name so trying old name: " + oldName);
        }
        vlanNic = getNetworkByName(conn, oldName);
        if (vlanNic != null) {
            s_logger.info("Renaming VLAN with old name " + oldName + " to " + newName);
            vlanNic.getNetwork().setNameLabel(conn, newName);
        }
    }
    if (vlanNic == null) {
        // Can't find it, then create it.
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Creating VLAN network for " + tag + " on host " + _host.getIp());
        }
        final Network.Record nwr = new Network.Record();
        nwr.nameLabel = newName;
        nwr.tags = new HashSet<String>();
        nwr.tags.add(generateTimeStamp());
        vlanNetwork = Network.create(conn, nwr);
        vlanNic = getNetworkByName(conn, newName);
        if (vlanNic == null) {
            // capture happened.
            throw new CloudRuntimeException("Could not find/create vlan network with name: " + newName);
        }
    }
    final PIF nPif = network.getPif(conn);
    final PIF.Record nPifr = network.getPifRecord(conn);
    vlanNetwork = vlanNic.getNetwork();
    if (vlanNic.getPif(conn) != null) {
        return vlanNetwork;
    }
    if (s_logger.isDebugEnabled()) {
        s_logger.debug("Creating VLAN " + tag + " on host " + _host.getIp() + " on device " + nPifr.device);
    }
    final VLAN vlan = VLAN.create(conn, nPif, tag, vlanNetwork);
    if (vlan != null) {
        final VLAN.Record vlanr = vlan.getRecord(conn);
        if (vlanr != null) {
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("VLAN is created for " + tag + ".  The uuid is " + vlanr.uuid);
            }
        }
    }
    return vlanNetwork;
}

Example 2 with VLAN

use of com.xensource.xenapi.VLAN in project cloudstack by apache.

the class XenServer56Resource method disableVlanNetwork.

@Override
public void disableVlanNetwork(final Connection conn, final Network network) {
    try {
        final Network.Record networkr = network.getRecord(conn);
        if (!networkr.nameLabel.startsWith("VLAN")) {
            return;
        }
        final String bridge = networkr.bridge.trim();
        for (final PIF pif : networkr.PIFs) {
            final PIF.Record pifr = pif.getRecord(conn);
            if (!pifr.host.getUuid(conn).equalsIgnoreCase(_host.getUuid())) {
                continue;
            }
            final VLAN vlan = pifr.VLANMasterOf;
            if (vlan != null) {
                final String vlannum = pifr.VLAN.toString();
                final String device = pifr.device.trim();
                if (vlannum.equals("-1")) {
                    return;
                }
                try {
                    vlan.destroy(conn);
                    final Host host = Host.getByUuid(conn, _host.getUuid());
                    host.forgetDataSourceArchives(conn, "pif_" + bridge + "_tx");
                    host.forgetDataSourceArchives(conn, "pif_" + bridge + "_rx");
                    host.forgetDataSourceArchives(conn, "pif_" + device + "." + vlannum + "_tx");
                    host.forgetDataSourceArchives(conn, "pif_" + device + "." + vlannum + "_rx");
                } catch (final XenAPIException e) {
                    s_logger.trace("Catch " + e.getClass().getName() + ": failed to destory VLAN " + device + " on host " + _host.getUuid() + " due to " + e.toString());
                }
            }
            return;
        }
    } catch (final XenAPIException e) {
        final String msg = "Unable to disable VLAN network due to " + e.toString();
        s_logger.warn(msg, e);
    } catch (final Exception e) {
        final String msg = "Unable to disable VLAN network due to " + e.getMessage();
        s_logger.warn(msg, e);
    }
}