uechi.io/_posts/2017-06-16-x11forward.md

---
title: Forward X11 window over SSH
date: 2017-06-16 00:00:00 +09:00
---

![x11-plot.png](/uploads/x11-plot.png)

## Ubuntu 16.04

Make sure you have installed SSH, X11 and xAuth on a remote server.

```
sudo apt install -y xorg xauth openssh
sudo sed -i '/ForwardX11/s/.*/ForwardX11 yes/' /etc/ssh/sshd_config
sudo service ssh restart
```

## macOS Sierra

You also need to have X11 on your local machine.

```
brew cask install xquartz # install X11
ssh -X <remote>
$ xeyes # verify you have X11
```

You might want to restart macOS if `$DISPLAY` have empty value.

# Plot with matplotlib

Plot a simple graph remotely on Ubuntu 16.04:

```python
import matplotlib.pyplot as plt
plt.plot([1, 2, 3])
plt.show()
```

If you can't see any window, add **backend** settings to `~/.config/matplotlib/matplotlibrc`.

```ini
backend: TkAgg
```

or just add few lines to change the backend explicitly:

```python
import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt
...
```