server.headerimage (Rust server ConVar)

server.headerimage is the address of the banner image for your server. The server's help text, which Facepunch marks as generated: "URL of the banner/header image shown at the top of this server's page in the server browser". Facepunch's server guide calls it the picture for the server and marks it optional.

It is a URL, not a file

The value is a web address, not an uploaded file, so the image has to be served from that address. Host it somewhere that will keep serving it at the same address, with a direct link to the image file rather than a page that shows the image.

server.headerimage "https://example.com/rust-banner.png"

Set it to "" to remove the banner.

Header image and logo image

Rust has a second image ConVar, server.logoimage, described by the server's generated help text as the "URL of the logo image shown for this server in the server browser". The header image is the banner at the top of the server's page; the logo is a separate image. Set them separately.

Applying and keeping it

It can be set on a running server, with no restart, over RCON or in the server console. Unlike most identity settings, server.writecfg does save it: our test server's serverauto.cfg had a server.headerimage line. That does not make serverauto.cfg the right place for it. The server's generated help text for server.readcfg says it runs serverauto.cfg first and server.cfg second, so a server.headerimage line in server.cfg overwrites whatever writecfg saved. Keep the value in server.cfg and treat serverauto.cfg as something the server writes, not a file you edit.

In Panelra

Header image is under Settings and applies instantly over RCON. Panelra writes both server.headerimage and server.logoimage into the server.cfg it regenerates on every apply and start, so the dashboard value is what the server ends up with.