Fix unhandled KeyError exception when starting Docker container. Ref #1991

gns3server/compute/docker/__init__.py

@@ -111,7 +111,7 @@ class Docker(BaseManager):
         body = await response.read()
         response.close()
         if body and len(body):
-            if response.headers['CONTENT-TYPE'] == 'application/json':
+            if response.headers.get('CONTENT-TYPE') == 'application/json':
                 body = json.loads(body.decode("utf-8"))
             else:
                 body = body.decode("utf-8")

gns3server/compute/docker/docker_vm.py

@@ -94,7 +94,7 @@ class DockerVM(BaseNode):
         self._console_websocket = None
         self._extra_hosts = extra_hosts
         self._extra_volumes = extra_volumes or []
-        self._permissions_fixed = False
+        self._permissions_fixed = True
         self._display = None
         self._closing = False