#Reopen putty every ssh sessions install

CTRL+B is the default so-called prefix key. If the need ever arises, you can also manually detach from a tmux session by pressing CTRL+B, then releasing the CTRL key and afterwards pressing D. This reattaches you to the session and you will see that the countdown continued even while you were disconnected. Afterward, log back in to your server and enter the following command: tmux attach For example, if you're running PuTTY, force-close the window. Now you can test what would happen if your SSH connection would end abruptly. Run the following command to start a simple countdown, from 600 to 1 (10*60 seconds = 10 minutes): for i in `seq 1 $((10*60)) | tac` do clear echo $i sleep 1 done echo 'Finished!'

#Reopen putty every ssh sessions install

On Debian or Ubuntu run: apt update & apt install tmuxĪnd on OpenSUSE: zypper refresh & zypper install tmux Attach and Detach from tmux Sessions Have a daemon type process that runs permanently on the instance and we need the ability to detach and reattach, as needed, to the terminal hosting the application to reestablish connectivity to the utility's text-based input/output interface.Run jobs that take a very long time to complete and we can't risk getting disconnected and losing progress.Have to run multiple terminal sessions in a single SSH session.With tmux, you can detach from the terminal, let the game utility run, and when you log back in you can re-attach to the terminal and input commands to kick or ban users, change maps and manage the game hosted on your instance.Īlthough obviously not limited to these use-cases, we can see that we will generally want tmux when we: Losing the terminal session would leave you without the ability to further interact with the program's input and change game settings while it's running.

You do have options to daemonize a process yourself, either through Bash commands or by writing systemd scripts, but, in this case, it's unfeasible because the game server utility also provides its own command line. Instead, this program runs in the foreground and if you would quit your SSH session, it would be closed. You are running a game server which doesn't have a ready-made daemon script to put the process in the background.You can later come back, reattach to the session and see how the compile job has progressed during your absence. If you run the compile in a tmux session, it doesn't get interrupted even if your connection drops or you simply need to log out from the server. If your SSH connection drops unexpectedly after say, 4 hours, the job will be interrupted and you may have to restart from scratch. It is estimated that this job will require at least 8 hours. Furthermore, you can also reattach to such sessions, which lets you see previous output you may have missed in the terminal and reestablishes the ability to interact with the input of programs running there. The ability to keep a session running, even if the user disconnects from it, makes it very useful in some scenarios. Here's a picture of three Bash shells hosted in tmux:Īlthough it's called a multiplexer, tmux can do many other interesting things besides multiplexing terminals. With a terminal multiplexer you can avoid multiple logins, launching as many shell sessions as you need, in a single SSH session. You need to log in through SSH two times: in a window you open a resource monitoring application like 'htop' and in another window you enter commands to perform the stress test. You want to see how your web server responds to stress tests.But practical examples are easier to understand than theory alone so let's explore a few use cases: Just like the operating system running on your phone or computer can execute and display, side by side, multiple applications on its graphical user interface, so can tmux do with text-based programs and shell sessions. However, in certain scenarios, you may need, or at least benefit, from expanding the capabilities of such a session with a terminal multiplexer like tmux. For most purposes, this simple setup suffices. Typically, you would connect to your server with an SSH client like PuTTY and after logging in you are dropped into a shell like Bash where you can enter commands and interact with the operating system. Tech Share is Alibaba Cloud's incentive program to encourage the sharing of technical knowledge and best practices within the cloud community.Īs you manage Alibaba Cloud Elastic Compute Service (ECS) instances, you will often find yourself working at the command line in so-called pseudo-terminal sessions. By Alexandru Andrei, Alibaba Cloud Tech Share Author.