External Component and Cluster
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## External Component and Cluster

If you want to use Tigase’s component in a cluster mode which does not have clustering implemented yet there is a way to make it kind of cluster-able. In the previous section we connected many MUC components to a single Tigase server. Now we want to connect a single MUC component to many Tigase servers (or many Tigase cluster nodes).

Let’s say we have Tigase XMPP Server working for domain: xmpp-test.org and the server is installed on three cluster nodes: red.xmpp-test.org, green.xmpp-test.org and blue.xmpp-test.org.

We want to make it possible to connect the MUC component to all nodes, so here is configuration for the server (for each node is the same):

    config-type=--gen-config-def
    --admins=admin@xmpp-test.org
    --virt-hosts = xmpp-test.org

    --cluster-mode = true
    --cluster-nodes=red.xmpp-test.org,green.xmpp-test.org,blue.xmpp-test.org

    --auth-db=tigase-auth
    --user-db=mysql
    --user-db-uri=jdbc:mysql://localhost/db?user=tigase&password=tigase

    --comp-name-1 = ext
    --comp-class-1 = tigase.server.ext.ComponentProtocol
    --external = muc.xmpp-test.org:muc-secret:listen:5270:\
           xmpp-test.org:accept:ReceiverBareJidLB

As you can see there is nothing special here. The most interesting part comes on the MUC side.

    config-type = --gen-config-comp
    --user-db = mysql
    --admins = admin@xmpp-test.orgg
    --user-db-uri = jdbc:mysql://localhost/db?user=tigase&password=tigase

    --virt-hosts = xmpp-test.org

    --comp-name-1 = muc
    --comp-class-1 = tigase.muc.MUCComponent
    --external = muc.xmpp-test.org:muc-secret:connect:5270:xmpp-test.org;blue.xmpp-test.org;green.xmpp-test.org,red.xmpp-test.org:accept

As you can see remote host name is not a simple domain but a character string with a few comma separated parts. The first part is our remote domain and the rest are addresses of the host to connect to. This can be a list of domain names or IP addresses.

Of course it is possible to connect multiple external component to all cluster nodes, this way the whole installation would be really working in the cluster and also load balanced.

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