ssh - OpenSSH remote login client
ssh [-T] [-i keyfile] [user@]host [command]Options you will use
-T- Disable pseudo-terminal allocation.
ssh -T [email protected]just tests auth. -i FILE- Use this private key.
-v- Verbose - the first thing to reach for when auth fails.
-p PORT- Port to connect to on the remote host (default 22).
-l USER- The user to log in as (same as user@host).
-o OPTION- An ssh_config option, e.g. -o StrictHostKeyChecking=accept-new, -o ConnectTimeout=5.
-t- Force a pseudo-terminal - needed to run sudo or top on the remote side.
-n- Read stdin from /dev/null - needed when ssh runs in a loop that reads stdin.
-N- Do not run a remote command (just forward ports).
-L LOCAL:HOST:PORT- Forward a local port to HOST:PORT as seen from the server.
-R REMOTE:HOST:PORT- Forward a port on the server back to HOST:PORT on this side.
-J JUMP- Connect through a jump host (bastion): -J user@bastion.
-A- Forward the SSH agent (the remote side can use your keys - only to hosts you trust).
-q- Quiet: suppress warnings and banners.
-F FILE- An alternative per-user config file (default ~/.ssh/config).
-vv- More verbose (-vvv the most).
Gotchas
- The first connection asks you to confirm the host key fingerprint and records it in ~/.ssh/known_hosts.
Taught in
- 17.43 Users are certificates: the CSR flow end to end
- 18.1 Under kubectl: the nodes are Linux machines
- 18.3 Static pods: how the control plane runs itself
- 18.11 kubeadm's certificates: who trusts whom, and for how long
- 18.16 The kubeadm upgrade, step by step
- 18.20 etcd: the cluster in one database, and how to back it up
Try ssh in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.