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59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
---
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title: "Persistent remote X sessions with xpra"
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date: 2020-01-15T18:29:57-05:00
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draft: false
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tags: [ "X11" ]
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medium_enabled: true
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---
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[`xpra`](http://xpra.org/) allows one to run persistent X applications on a remote host and display it on a local machine. It's a combination of [SSH X11 Forwarding](https://wiki.archlinux.org/index.php/OpenSSH#X11_forwarding) and [Screen](https://www.gnu.org/software/screen/).
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To get started you need to install the `xpra` package on both the server and client. On Ubuntu 18.04, this package isn't configured properly so one should use this PPA instead.
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```bash
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sudo add-apt-repository ppa:mikhailnov/xpra
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```
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To install,
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```bash
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sudo apt install xpra
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```
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Now you can from the client open up an application with one command
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```bash
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xpra start ssh:user@host --exit-with-children --start-child="executable"
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```
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If you want it to behave more like screen. Then on the server.
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```bash
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xpra start :100
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```
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Where you can replace `:100` with another high display number.
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Then you can run the executable,
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```bash
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DISPLAY=:100 executable
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```
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From the client,
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```bash
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xpra attach ssh:user@host:100
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```
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`xpra` has heuristics that determines the encoding of the images passed. You can however override it using the `--encoding`s flag to better tailor to your needs.
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- `rgb`: Raw pixel format that is lossless and uses compression. Best in high bandwidth environments.
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- `png` compressed, lossless, but CPU intensive. May result in skipped frames
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- `h264`, `vp8`, `vp9` are lossy formats that have tunable quality and speed parameters
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More resources:
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- [Arch Wiki](https://wiki.archlinux.org/index.php/Xpra)
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- [Ubuntu Wiki](https://help.ubuntu.com/community/Xpra)
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