Deploy Bun Apps
Bun is a recently popular Node alternative for back-end Javascript runtime environment. Like Node, you don't need to compile your code beforehand.
There is no default bun
compiler at system level. You have to install it first through deployment scripts.
Serving Bun apps requires to be run via GLS, that's mean you have to listen from given PORT
env/args. Bun.serve
is already doing this if you don't set the port
explicitly.
Example
The deployment script below installs the latest bun
compiler and writes app.ts
and serves that.
source: clear
features:
- bun latest
nginx:
root: public_html/public
passenger:
enabled: "on"
app_start_command: env PORT=$PORT bunfix bun app.ts
commands:
- filename: app.ts
content: |
const html_text = `
<!DOCTYPE html>
<html>
<head>
<title>Bun App</title>
<link rel="stylesheet" href="//unpkg.com/bootstrap/dist/css/bootstrap.min.css">
</head>
<body class="p-5 text-center">
<p><img src="//images.unsplash.com/photo-1465153690352-10c1b29577f8?fit=crop&w=200&h=200"
class="img-fluid rounded-circle"></p>
<h1 class="mb-3">Hello, world!</h1>
<p>Serving from Bun version ${Bun.version}</p>
<p class="text-muted">DOM Cloud</p>
</body>
</html>
`
const server = Bun.serve({
fetch(request) {
return new Response(html_text, {
headers: { "Content-Type": "text/html" },
});
},
});
Note three things:
Bun.serve
already set theport
arg fromPORT
env by defaultbunfix bun app.ts
is used to run Bun with a workaround of an ongoing issue- This bunfix proxies request to the bun app, this proxy support HTTP and Websocket
For existing bun apps, use this deployment script. Please adjust relevant fields such as the startup file (change app.ts
) and how $PORT
is delivered (via env PORT=$PORT bunfix bun ...
).
features:
- bun latest
nginx:
root: public_html/public
passenger:
enabled: "on"
app_start_command: env PORT=$PORT bunfix bun app.ts
Use other Bun versions
To switch Bun version use feature syntax like bun latest
, bun beta
, bun 1.0.0
, etc. Check your current Bun version using bun --version
in SSH.
features:
- bun 1.0.0
Bun install scripts is powered by webi.
App Management
Your app do not restarted automatically after file changes. To restart, run restart
via SSH.
Environment variables can be set either using NGINX's env_var_list
or ~/.bashrc
. Usually your language framework also reads .env
files.
See NGINX and App Daemon for more information about NGINX and App managements including restarting, environment variables, and other global limitations.
App Logging
You can see app log from Check -> Check Process Logs tab. Only startup problems displayed in the browser.
Bun can show runtime errors in browser by setting app_env: development
in the passenger
config of NGINX.
It's recommended to use a proper logging mechanism such as Pino or Winston then write it to a log file, or any other solution that suits you.
NGINX errors and traffic logs can be examined via Webmin or Check -> Check Process Logs tab.