How to keep sessions running after disconnect with tmux

If you close the SSH connection, processes started in the terminal stop. tmux solves this: sessions stay alive on the server and you can reconnect to them anytime.

1. Install

apt-get update -y
apt-get install -y tmux

2. Start a session

tmux new -s work

3. Detach (the session stays running)

Press Ctrl+b then d. You can close SSH; the process continues.

4. Reconnect

tmux attach -t work
tmux ls              # list sessions

When it is useful

• Long migrations or backups that must not be interrupted.
• Builds or database imports that take hours.
• Watching a live process without having to keep SSH open.

tmux or systemd?

tmux is for temporary, interactive tasks. For permanent services that must start on their own, use a systemd service.