SSH multiplexing (ControlMaster)

Reuse existing connection for subsequent SSH commands

ssh -o ControlMaster=auto -o ControlPath=~/.ssh/mux-%r@%h:%p -o ControlPersist=10m user@host
tool
ssh15 commands
tags
sshperformance

More ssh commands

  • Run remote command
    ssh user@host 'sudo systemctl status nginx'

    Execute a command over SSH without interactive shell

  • Copy file via SCP
    scp -r -P 2222 ./dist/ user@host:/var/www/app/

    Recursive copy on non-standard port

  • Agent forwarding
    ssh -A user@bastion

    Forward local SSH agent to the remote host (use with caution)

  • Add key to agent
    eval $(ssh-agent) && ssh-add ~/.ssh/id_ed25519

    Start agent and load a key for the session

  • SSH config file host entry
    cat >> ~/.ssh/config <<'EOF' Host dev HostName 10.0.0.5 User ubuntu IdentityFile ~/.ssh/dev_key ProxyJump bastion EOF

    Shorthand alias: 'ssh dev' triggers all options

all 15 ssh commands