Home » How to keep processes running after ending ssh session?

How to keep processes running after ending ssh session?

Solutons:


You should look for modern alternatives like tmux.

tmux is superior to screen for many reasons, here are just some examples:

  • Windows can be moved between session and even linked to multiple sessions
  • Windows can be split horizontally and vertically into panes
  • Support for UTF-8 and 256 colour terminals
  • Sessions can be controlled from the shell without the need to enter a session

Basic Functionality

To get the same functionality as explained in the answer recommending screen, you would need to do the following:

  • ssh into the remote machine
  • start tmux by typing tmux into the shell
  • start the process you want inside the started tmux session
  • leave/detach the tmux session by typing Ctrl+b and then d

You can now safely log off from the remote machine, your process will keep running inside tmux. When you come back again and want to check the status of your process you can use tmux attach to attach to your tmux session.

If you want to have multiple sessions running side-by-side, you should name each session using Ctrl+b and $. You can get a list of the currently running sessions using tmux list-sessions, now attach to a running session with command tmux attach-session -t <session-name>.

tmux can do much more advanced things than handle a single window in a single session. For more information have a look in man tmux or the tmux GitHub page. In particular, here’s an FAQ about the main differences between screen and tmux.

Option 1: nohup

The best way is often the simplest.

nohup long-running-command &

It was made specifically for this, it even logs stdout to nohup.log.

man nohup

Option 2: bg + disown

ctrl+z
bg
disown -h

If you want to “background” already running tasks, then Ctrl+Z then run bg to put your most recent suspended task to background, allowing it to continue running. disown will keep the process running after you log out. The -h flag prevents hangup.


screen and others can do it, but that’s not what they’re for. I recommend nohup for tasks you know you are going to leave behind and bg for tasks you’re already running and don’t want to re-start.

Keep in mind, both are bash specific. If you’re not using bash, then the commands could be different.

You could do that by using screen.

Type man screen to find out more or read this screen man page.

Simple scenario:

  • ssh into your remote box. Type screen Then start the process you want.

  • Press CtrlA then CtrlD. This will “detach” your screen session but leave your processes running. You can now log out of the remote box.

  • If you want to come back later, log on again and type screen -r This will “resume” your screen session, and you can see the output of your process.

Related Solutions

Winsock programming connecting to a public ip

The issue is with your server. You are binding it to 127.0.0.1. This means your server will only bind to the loopback interface, so only clients running on the same machine as the server will be able to connect to the server using this same interface. If you...

Pin-board effect with CSS [closed]

You can use JavaScript to accomplish this but it can't be done with CSS floats alone. A library like jQuery masonry will do it well. The reason? The specs on floats. In particular #5 which says, "The outer top of a floating box may not be higher than the outer...

Calculate the sum with minimum usage of numbers

Here's a hint: 23 : 11 + 11+ 1 ( 3 magic numbers) 120: 110+ 10 (2 magic numbers) The highest digit in the target number is the answer, since you need exactly k magic numbers (all having 1 in the relevant position) in order for the sum to contain the digit k. So...

Why not drop the “auto” keyword? [duplicate]

Your proposal would be rejected on the basis of backward compatibility alone. But let's say for the sake of argument that the standards committee like your idea. You don't take into account the numerous ways you can initialize a variable widget w; // (a) widget...

Recursive to iterative using a systematic method [closed]

So, to restate the question. We have a function f, in our case fac. def fac(n): if n==0: return 1 else: return n*fac(n-1) It is implemented recursively. We want to implement a function facOpt that does the same thing but iteratively. fac is written almost in...

How can I match values in one file to ranges from another?

if the data file sizes are not huge, there is a simpler way $ join input1 input2 | awk '$5<$4 && $3<$5 {print $2, $5-$3+1}' B100002 32 B100043 15 B123465 3 This Perl code seems to solve your problem It is a common idiom: to load the entire...

Javascript difference between “=” and “===” [duplicate]

You need to use == or === for equality checking. = is the assignment operator. You can read about assignment operators here on MDN. As a quick reference as you are learning JS: = assignment operator == equal to === equal value and equal type != not equal !==...

Compiler complains about misplaced else [closed]

Your compiler complains about an misplaced else because, well, there is an else without a preceding if: // ... for (j=1; j<n-i; j++) { if(a[j]<=a[j+1]) { // ... } // END OF IF } // END OF FOR else { continue; } // ... The else in your code does not follow...

Bootstrap – custom alerts with progress bar

/* !important are just used to overide the bootstrap css in the snippet */ .alertContainer { border-radius: 0 !important; border-width: 0 !important; padding: 0 !important; height: auto !important; position: absolute !important; bottom: 15px !important; left:...

How to Garbage Collect an external Javascript load?

Yes, s.onload = null is useful and will garbage collect! As of 2019, it is not possible to explicitly or programmatically trigger garbage collection in JavaScript. That means it collects when it wants. Although there is cases where setting to null may do a GC...

Math programming with python

At first, what you are looking for is the modulo operator and the function math.floor() Modulo from wikipedia: In computing, the modulo operation finds the remainder after division of one number by another (sometimes called modulus). for example: 12%12=0...

Android slide over letters to create a word [closed]

Here some advice you can use: First for each cell you can create an object that represents the state of that cell: class Cell { char mChar; int row,column; boolean isSelected; } then you can create a 2D array of your cells Cell[][] mTable = ... For views you...

Sum two integers in Java

You reused the x and y variable names (hence the variable x is already defined in method main error), and forgot to assign the ints read from the Scanner to the x and y variables. Besides, there's no need to create two Scanner objects. public static void...