Hi, I tried to following: $ docker run -it -u user -w /home/user tiagopeixoto/graph-tool ipython Python 3.6.5 (default, May 11 2018, 04:00:52) Type 'copyright', 'credits' or 'license' for more information IPython 6.3.1 -- An enhanced Interactive Python. Type '?' for help. In [1]: from graph_tool.all import * Unable to init server: Could not connect: Connection refused Unable to init server: Could not connect: Connection refused In [2]: g = Graph() In [3]: v1 = g.add_vertex() In [4]: v2 = g.add_vertex() In [5]: e = g.add_edge(v1, v2) In [6]: graph_draw(g, vertex_text=g.vertex_index, vertex_font_size=18, ...: output_size=(200, 200), output="two-nodes.png") Out[6]: <PropertyMap object with key type 'Vertex' and value type 'vector<double>', for Graph 0x7f60e1fbadd8, at 0x7f60e1fbcd68> Do I make any obvious mistake? thanks, mwarning