Renamed *Instance to *Node for better readability and to avoid conflict with notion of Karaf instance.
Added cluster service and trivial store implementations.
diff --git a/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java b/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java
new file mode 100644
index 0000000..1057d6e
--- /dev/null
+++ b/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java
@@ -0,0 +1,45 @@
+package org.onlab.onos.cli;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onlab.onos.cluster.ClusterService;
+import org.onlab.onos.cluster.ControllerNode;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import static com.google.common.collect.Lists.newArrayList;
+
+/**
+ * Lists all controller cluster nodes.
+ */
+@Command(scope = "onos", name = "nodes",
+         description = "Lists all controller cluster nodes")
+public class NodesListCommand extends AbstractShellCommand {
+
+    private static final String FMT =
+            "id=%s, ip=%s, state=%s %s";
+
+    protected static final Comparator<ControllerNode> ID_COMPARATOR =
+            new Comparator<ControllerNode>() {
+        @Override
+        public int compare(ControllerNode ci1, ControllerNode ci2) {
+            return ci1.id().toString().compareTo(ci2.id().toString());
+        }
+    };
+
+    @Override
+    protected Object doExecute() throws Exception {
+        ClusterService service = getService(ClusterService.class);
+        List<ControllerNode> nodes = newArrayList(service.getNodes());
+        Collections.sort(nodes, ID_COMPARATOR);
+        ControllerNode self = service.getLocalNode();
+        for (ControllerNode node : nodes) {
+            print(FMT, node.id(), node.ip(),
+                  service.getState(node.id()),
+                  node.equals(self) ? "*" : "");
+        }
+        return null;
+    }
+
+}
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 9d8259e..419ed16 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -2,6 +2,9 @@
 
     <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
         <command>
+            <action class="org.onlab.onos.cli.NodesListCommand"/>
+        </command>
+        <command>
             <action class="org.onlab.onos.cli.net.FlowsListCommand"/>
         </command>
         <command>