Don’t you hate it when you have to reach for 2FA or the password manager again and again when transferring multiple files over
scp or opening an extra
ssh session because your cluster’s
ls command froze again?
Turns out that
ssh can keep it alive for you! A
ControlMaster feature can be configured in
Host my.cluster.address HostName my.cluster.address User myusername ControlPath ~/.ssh/controlmasters/%r@%h:%p ControlMaster auto ControlPersist 20m
mkdir ~/.ssh/controlmasters. You should be able to reuse
scp active sessions within the
Hey, my X server forwarding isn’t working now!
The first connect needs to have
ssh -X option. Manually delete the file in
~/.ssh/controlmasters and connect again.
Doesn’t this make things less secure?
You already have an open
ssh session in your computer to the target machine. If someone has console access to run
ssh you have more than this to worry about.
For sanity you can always set
ControlPersist to a shorter time so the session is kept alive shorter than the last disconnect.
This is a quick tip post. They are written in a way to help users quickly resolve a problem that I ran into in my daily work and usually don’t go in depth about the details of ‘why’. Please feel free to comment or contribute to the knowledge.