Coding Knowledge Center
SSH/SCP/SFTP
| Setup SSH (1. ssh-keygen - dsa) |
1) ssh-keygen -t dsa
2) ssh-keygen -t rsa
1) Creates dsa encrypted keys.
Creates ~/.ssh/id_dsa (private key).
Creates ~/.ssh/id_dsa.pub (public key).
2) Creates rsa encrypted keys.
Creates ~/.ssh/id_rsa (private key).
Creates ~/.ssh/id_rsa.pub (public key).
| Setup SSH (2. dir structure) |
~/.ssh
authorized keys: list of public keys which will be granted access and require no login password
id_dsa: private dsa encypted key
id_dsa.pub: public dsa encrypted key
id_rsa: private rsa encrypted key
id_rsa.pub: public rsa encyrpted key
known_hosts: list of known host keys the current user has previously secure shelled to
Typical secure shell home directory file contents.
| Setup SSH (3. authorized_keys file) |
cat id_dsa.pub >> $HOME/.ssh/authorized_keys
Put your public key in this file on the remote server so it will no longer prompt for password.
CAVEAT: make sure the entire key is all on one line!
The best way to do this is to copy id_[dsa/rsa].pub to the remote server and then type the above line.
| Setup SSH (4. Organize keys) |
~/.ssh/
site1/
id_dsa
id_dsa.pub
id_rsa
id_rsa.pub
site2/
id_dsa
id_dsa.pub
id_rsa
id_rsa.pub
> ssh -i ~/.ssh/site1 user@site1.com
> ssh -i ~/.ssh/site2 user@site2.com
TIP!
You can actually organize your keys in various sub directories and then specify which set to use when using ssh. Use the -i option to tell ssh where to access the keys that are to be used.
| scp (Copy dirs/files) |
scp [dir/file] [hostname]:[dir/file]
scp [dir/file] [user]@[hostname]:[dir/file]
Secure copy [dir/file] to [hostname] as [dir/file].
Secure copy [dir/file] as [user] to [hostname] as [dir/file].
| sftp (Copy dirs/files) |
1) sftp [dir/file] [login]@[hostname]:[dir/file]
2) sftp -b [input file] [login]@[hostname]
1) Secure ftp [dir/file] to [hostname] as [dir/file].
2) Secure ftp in batch mode using commands in input file.
| ssh (Connect) |
ssh [login]@[hostname]
ssh -l [login] [hostname]
Secure shell as [login] to [hostname].
| ssh (Diff) |
ssh remotehost "cat remote_file" | diff - "local_file"
Connect to a remote host and perform a diff between a remote and local file.
| ssh (Tunnel) |
ssh -L 9001:localhost:21 steved@blackbox
> ftp localhost 9001
Port forward an ssh connection to port 9001.
Ftp through encrypted port 9001.