Secure Shell - Revision history

Kevin: /* Generate RSA Key */

2013-06-01T09:29:28Z

Generate RSA Key

← Older revision		Revision as of 09:29, 1 June 2013
Line 73:		Line 73:

	=== Generate RSA Key ===		=== Generate RSA Key ===
-	$ mkdir ~/.ssh	+	<pre>
-	$ chmod 700 ~/.ssh	+	$ mkdir ~/.ssh
-	$ ssh-keygen -t rsa	+	$ chmod 700 ~/.ssh
		+	</pre>
		+	<pre>
		+	$ ssh-keygen -t rsa
		+	</pre>
		+	* OR
		+	<pre>
		+	$ ssh-keygen -t rsa -C "username@your.email.com"
		+	</pre>

	=== SSH Key Encryption Level ===		=== SSH Key Encryption Level ===

2013-04-26T15:41:40Z

SSH timed out too quickly

← Older revision		Revision as of 15:41, 26 April 2013
Line 149:		Line 149:
	ServerAliveInterval 30		ServerAliveInterval 30
	</pre>		</pre>
-	** The client will check if the server is still alive every 30 seconds.	+	* The client will check if the server is still alive every 30 seconds.

2013-04-26T15:41:05Z

← Older revision		Revision as of 15:41, 26 April 2013
Line 136:		Line 136:
	$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R 1.2.3.4		$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R 1.2.3.4
	</pre>		</pre>
		+
		+
		+	= Troubleshooting =
		+	== SSH timed out too quickly ==
		+	*Problem:
		+	** Accessing a server through SSH and use it.
		+	** don't use it for a short period of time (like less than 1 minute).
		+	** Then the server doesn't respond anymore.
		+	* Possible Solution:
		+	** Edit <code>/etc/ssh/ssh_config</code> file. Add the following line.
		+	<pre>
		+	ServerAliveInterval 30
		+	</pre>
		+	** The client will check if the server is still alive every 30 seconds.

2013-03-31T20:45:45Z

known_hosts

← Older revision		Revision as of 20:45, 31 March 2013
Line 130:		Line 130:
	* Way to remove key from ~/.ssh/known_hosts		* Way to remove key from ~/.ssh/known_hosts
	<pre>		<pre>
-	$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R IP_ADDRESS	+	$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R IP_ADDRESS
	</pre>		</pre>
	e.g.)		e.g.)

2013-03-31T20:12:44Z

← Older revision		Revision as of 20:12, 31 March 2013
Line 125:		Line 125:
	try this.		try this.
	$ ssh -o PubkeyAuthentication=no username@host		$ ssh -o PubkeyAuthentication=no username@host
		+
		+
		+	== known_hosts ==
		+	* Way to remove key from ~/.ssh/known_hosts
		+	<pre>
		+	$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R IP_ADDRESS
		+	</pre>
		+	e.g.)
		+	<pre>
		+	$ ssh-keygen -f "/home/USERNAME/.ssh/known_hosts" -R 1.2.3.4
		+	</pre>

2013-03-28T18:25:22Z

Set up to Use only SSH Key to Log in

← Older revision		Revision as of 18:25, 28 March 2013
Line 108:		Line 108:
	# by Kevin (1 line)		# by Kevin (1 line)
	PasswordAuthentication no		PasswordAuthentication no
		+
		+	If logging in with SSH key fails with the following error message.
		+	Agent admitted failure to sign using the key.
		+
		+	run <code>ssh-add</code>
		+	<pre>
		+	$ ssh-add your-key
		+	Enter passphrase for your-key:
		+	Identity added: your-key (your-key)
		+	</pre>

	=== Login without Using SSH Key ===		=== Login without Using SSH Key ===

2013-03-28T17:25:48Z

Transfer Client Key to Host

← Older revision		Revision as of 17:25, 28 March 2013
Line 86:		Line 86:

	Or,		Or,
-	ssh-copy-id <username>@<host>	+	ssh-copy-id <username>@<host>
-	ssh-copy-id -i ~/.ssh/rsa_file.pub <username>@<host>	+	ssh-copy-id -i ~/.ssh/rsa_file.pub <username>@<host>

	To specify the port number		To specify the port number
-	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@<host -p ~~4711~~"	+	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@host -p 1234"

	If it fails with the following error message.		If it fails with the following error message.
	Received disconnect from 1.2.3.4: Too many authentication failures for user		Received disconnect from 1.2.3.4: Too many authentication failures for user
	Set <code>-o PubkeyAuthentication=no</code> option.		Set <code>-o PubkeyAuthentication=no</code> option.
-	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@<host -p ~~4711~~ -o PubkeyAuthentication=no"	+	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@host -p 1234 -o PubkeyAuthentication=no"
-		+

	=== Set up to Use only SSH Key to Log in ===		=== Set up to Use only SSH Key to Log in ===

2013-03-28T17:17:31Z

← Older revision		Revision as of 17:17, 28 March 2013
Line 88:		Line 88:
	ssh-copy-id <username>@<host>		ssh-copy-id <username>@<host>
	ssh-copy-id -i ~/.ssh/rsa_file.pub <username>@<host>		ssh-copy-id -i ~/.ssh/rsa_file.pub <username>@<host>
		+
		+	To specify the port number
		+	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@<host -p 4711"
		+
		+	If it fails with the following error message.
		+	Received disconnect from 1.2.3.4: Too many authentication failures for user
		+	Set <code>-o PubkeyAuthentication=no</code> option.
		+	ssh-copy-id -i ~/.ssh/rsa_file.pub "username@<host -p 4711 -o PubkeyAuthentication=no"

2012-08-10T10:58:12Z

← Older revision		Revision as of 10:58, 10 August 2012
Line 101:		Line 101:
	# by Kevin (1 line)		# by Kevin (1 line)
	PasswordAuthentication no		PasswordAuthentication no
		+
		+	=== Login without Using SSH Key ===
		+	If SSH access failed with the following error,
		+	$ ssh username@host
		+	ssh: connect to host kevin-l port 22: No route to host
		+	try this.
		+	$ ssh -o PubkeyAuthentication=no username@host

2012-07-28T15:25:39Z

SSH Key Encryption Level

← Older revision		Revision as of 15:25, 28 July 2012
Line 78:		Line 78:

	=== SSH Key Encryption Level ===		=== SSH Key Encryption Level ===
-	The default ssh key encryption level is 2048. To ~~in crease~~ it to 4096	+	The default ssh key encryption level is 2048. To increase it to 4096
	$ ssh-keygen -t rsa -b 4096		$ ssh-keygen -t rsa -b 4096
-

	=== Transfer Client Key to Host ===		=== Transfer Client Key to Host ===