First look
You can extend the ssh connection time out by the param ServerAliveInterval as I have mentioned before. But if the connection is accidentally disconnect (maybe by network problem), how can you get resume to your ssh session again ?Linux screen command is the rescure in such these situations. With screen command you can create as many virtual session terminal as you want.
I myself right after sucessfully ssh logon, I start screen immediately to get into virtual terminal. If there is any problem causing the connection lost, I can resume back to the right terminal easily.
How to use screen command
Check if you have installed the screen package. If not, just install it.# yum install screen
- To enter a virtual screen : #screen- To list if there is any screen open before :
[root@myPC ~]# screen -ls
There is a screen on:
2664.pts-1.myPC (Detached)
1 Socket in /var/run/screen/S-root.
- To resume a screen : # screen -dr 2664When you are already in a screen :
- To list all screens : Ctrl + a then "
- To create a new screen : Ctrl + a then c
- To jump to next screen : Ctrl + a then n
- To jump to previous screen : Ctrl + a then p
- To jump recycle screen : Ctrl + a then space
- To detach a screen : Ctrl + a then d
- To detach a screen : Ctrl + a then d
- Split into 2 sub-screen by horizontal : Ctrl + a then S
- To jump from sub-screen to other sub-screen : Ctrl + a then Tab
- In this image, I run iostat and top command at the same time in two subscreen devided by horizontal.
- Split into 2 sub-screen by vertical : Ctrl + a then |
- To jump from sub-screen to other sub-screen : Ctrl + a then Tab
- In this image, I run iostat and top command at the same time in two subscreen devided by vertical.- To kill a screen : Ctrl + a then k or type exit
You can try resume by entering a screen and plug out the network cable to simulate the network lost connection, then you can resume by #screen -dr.
It works right ? and that's it.
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