diff --git a/wally/node_interfaces.py b/wally/node_interfaces.py
new file mode 100644
index 0000000..e0b56aa
--- /dev/null
+++ b/wally/node_interfaces.py
@@ -0,0 +1,90 @@
+import abc
+from typing import Any, Set, Optional, List, Dict, Callable
+
+
+class NodeInfo:
+    """Node information object, result of dicovery process or config parsing"""
+
+    def __init__(self,
+                 ssh_conn_url: str,
+                 roles: Set[str],
+                 hops: List['NodeInfo'] = None,
+                 ssh_key: bytes = None) -> None:
+
+        self.hops = []  # type: List[NodeInfo]
+        if hops is not None:
+            self.hops = hops
+
+        self.ssh_conn_url = ssh_conn_url  # type: str
+        self.rpc_conn_url = None  # type: str
+        self.roles = roles  # type: Set[str]
+        self.os_vm_id = None  # type: Optional[int]
+        self.ssh_key = ssh_key  # type: Optional[bytes]
+        self.params = {}  # type: Dict[str, Any]
+
+
+class ISSHHost(metaclass=abc.ABCMeta):
+    """Minimal interface, required to setup RPC connection"""
+    info = None  # type: NodeInfo
+
+    @abc.abstractmethod
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        pass
+
+    @abc.abstractmethod
+    def get_ip(self) -> str:
+        pass
+
+    @abc.abstractmethod
+    def __str__(self) -> str:
+        pass
+
+    @abc.abstractmethod
+    def put_to_file(self, path: str, content: bytes) -> None:
+        pass
+
+
+class IRPCNode(metaclass=abc.ABCMeta):
+    """Remote filesystem interface"""
+    info = None  # type: NodeInfo
+
+    @abc.abstractmethod
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+        pass
+
+    @abc.abstractmethod
+    def copy_file(self, local_path: str, remote_path: str = None) -> str:
+        pass
+
+    @abc.abstractmethod
+    def get_file_content(self, path: str) -> bytes:
+        pass
+
+    @abc.abstractmethod
+    def put_to_file(self, path:str, content: bytes) -> None:
+        pass
+
+    @abc.abstractmethod
+    def forward_port(self, ip: str, remote_port: int, local_port: int = None) -> int:
+        pass
+
+    @abc.abstractmethod
+    def get_interface(self, ip: str) -> str:
+        pass
+
+    @abc.abstractmethod
+    def stat_file(self, path:str) -> Any:
+        pass
+
+    @abc.abstractmethod
+    def node_id(self) -> str:
+        pass
+
+
+    @abc.abstractmethod
+    def disconnect(self) -> str:
+        pass
+
+
+
+RPCBeforeConnCallback = Callable[[NodeInfo, int], None]
\ No newline at end of file