This question already has an answer here:
I want to start tmux so that it won't quit when last pane/window is killed. As for now I do it this way :
tmux new -d -s my_session_name
I can add a windows name as such:
tmux new -d -s my_session_name -n window_name
But it will still be killed on last windows kill. I would like to make it like permanent on this machine until somebody explicitly kills it.