SSH

You SSH into a server to run a long task, the network drops, and the task is gone. Tmux exists to solve exactly this — it decouples the terminal session from the window, so the process keeps running after you close the terminal. Tmux's three layers: a Session contains Windows, a Window contains Panes The Core Problem It Solves # An ordinary terminal window is bound to its processes. Close the window and the processes die. Same story when SSH drops.

Update note: This post is based on the Codex App as of May 2026. SSH Remote is still in alpha, and the configuration methods and UI entry points may change with new releases. If anything here has gone stale, refer to the official documentation for the latest. The Codex App now supports connecting to remote machines over SSH; the feature is currently in alpha. If you develop on remote servers, train models, or run environments there, this is worth a try. It lets you connect to a remote server directly inside Codex and work in the remote filesystem and shell — no more jumping back and forth between a local terminal, VSCode Remote, SSH, and tmux.