fix for docker/lxd based nodes to use remote servers and example for lxd

daemon/examples/python/distributed_lxd.py

@@ -0,0 +1,51 @@
+import logging
+import pdb
+import sys
+
+from core.emulator.coreemu import CoreEmu
+from core.emulator.emudata import IpPrefixes, NodeOptions
+from core.emulator.enumerations import EventTypes, NodeTypes
+
+
+def main():
+    address = sys.argv[1]
+    remote = sys.argv[2]
+
+    # ip generator for example
+    prefixes = IpPrefixes(ip4_prefix="10.83.0.0/16")
+
+    # create emulator instance for creating sessions and utility methods
+    coreemu = CoreEmu({"distributed_address": address})
+    session = coreemu.create_session()
+
+    # initialize distributed
+    server_name = "core2"
+    session.add_distributed(server_name, remote)
+
+    # must be in configuration state for nodes to start, when using "node_add" below
+    session.set_state(EventTypes.CONFIGURATION_STATE)
+
+    # create local node, switch, and remote nodes
+    options = NodeOptions(image="ubuntu:18.04")
+    node_one = session.add_node(_type=NodeTypes.LXC, node_options=options)
+    options.emulation_server = server_name
+    node_two = session.add_node(_type=NodeTypes.LXC, node_options=options)
+
+    # create node interfaces and link
+    interface_one = prefixes.create_interface(node_one)
+    interface_two = prefixes.create_interface(node_two)
+    session.add_link(node_one.id, node_two.id, interface_one, interface_two)
+
+    # instantiate session
+    session.instantiate()
+
+    # pause script for verification
+    pdb.set_trace()
+
+    # shutdown session
+    coreemu.shutdown()
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO)
+    main()