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OpenSSH Speed Tips and Tricks
ssh-copy-id, sshfs, speed!
November 21, 2008
SSH is a secure remote administration utility with a seemingly endless variety of clever shortcuts and capabilities. For example, you can log in and execute a remote command with a single command, rather than first logging in and then typing the command:
carla@host1:~$ ssh terry@host2 ls ~This is a fun example that also demonstrates a little gotcha- ls ~ will list Carla's home directory, not Terry's. If you want to see Terry's home directory you must specify ls /home/terry. You can do this with any one-off command, such as starting a backup script, viewing running processes or printing a document.
$ ssh-copy-id -i id_rsa.pub terry@host2ssh-copy-id copies identity keys in the correct format, makes sure file permissions and ownership are correct, and ensures a private key is not accidentally copied.
Using key-based authentication instead of passwords means you don't have to give away system passwords. To make it easier to manage multiple remote systems, you can give your keys any arbitrary names you want when you create them, like this:
$ ssh-keygen -t rsa -f id_apacheserverWhen you connect, you simply name the correct key:
$ ssh -i id_apacheserver email@example.comFinally, don't forget the wonderful sshfs command for mounting an entire remote filesystem. It's much faster and easier than setting up a Samba or NFS server. First, create a local directory for the mountpoint, then fetch your remote filesystem:
$ sshfs hostname:/remotedir localdir/Now, you can operate on the remote files as if they were local.
Article courtesy of ServerWatch.com