Operating Systems 2017F: Tutorial 8 - Revision history

Soma: /* Public key authentication and ssh */

2017-11-29T14:06:55Z

Public key authentication and ssh

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	===Public key authentication and ssh===		===Public key authentication and ssh===

	Create a public key file for ~~the~~ student ~~user~~:		Create a public key file for your account (as user student, ubuntu, or your personal account):

	ssh-keygen		ssh-keygen

2017-11-29T14:06:18Z

Remote filesystems using sshfs

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	===Remote filesystems using sshfs===		===Remote filesystems using sshfs===

	To mount the other user's files ~~(as the user student)~~ in a directory called "otherfiles", do the following:		To mount the other user's files in a directory called "otherfiles", do the following (as user student, ubuntu, or your personal account):

	mkdir otherfiles		mkdir otherfiles
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	fusermount -u otherfiles		fusermount -u otherfiles


	===Public key authentication and ssh===		===Public key authentication and ssh===

2017-11-29T13:59:09Z

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	You'll have to enter your password.		You'll have to enter your password.

	If you don't get a password prompt, password authentication has probably been disabled. To enable it, do the following		If you don't get a password prompt, password authentication has probably been disabled. (Password authentication has been disabled on the openstack VMs.) To enable it, do the following

	sudo nano /etc/ssh/sshd_config (or vi, or emacs)		sudo nano /etc/ssh/sshd_config (or vi, or emacs)
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	sudo service sshd restart		sudo service sshd restart

			Be sure to change it back after you've set up public key authentication!

	===Remote filesystems using sshfs===		===Remote filesystems using sshfs===

2017-11-29T13:58:03Z

Setup

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	ssh other@localhost		ssh other@localhost

			You'll have to enter your password.

			If you don't get a password prompt, password authentication has probably been disabled. To enable it, do the following

			sudo nano /etc/ssh/sshd_config (or vi, or emacs)

			In the editor change the line "PasswordAuthentication no" to "PasswordAuthentication yes". Then, to restart sshd:

			sudo service sshd restart

	===Remote filesystems using sshfs===		===Remote filesystems using sshfs===

2017-11-27T04:34:59Z

← Older revision		Revision as of 04:34, 27 November 2017
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	~~'''This tutorial is not yet finalized.'''~~

	In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [https://github.com/libfuse/libfuse FUSE].		In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [https://github.com/libfuse/libfuse FUSE].

2017-11-27T04:33:39Z

Tasks

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	# Setup password-less login to the SCS system (and then undo it).		# Setup password-less login to the SCS system (and then undo it).
	# How can you use the mount command to unmount a sshfs-mounted filesystem (rather than fusermount)?		# How can you use the mount command to unmount a sshfs-mounted filesystem (rather than fusermount)?
			# Look at the questions in Assignment 4. What experiments can you do to help you answer those questions?

2017-11-27T01:20:44Z

Tasks

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	==Tasks==		==Tasks==

	* Look at the hard link counts of files locally and compare those to the link counts over sshfs. How do they compare?		# Look at the hard link counts of files locally and compare those to the link counts over sshfs. How do they compare?
	* Can you access sshfs mounted files as root? (You can become root by typing "sudo su -".) What happens?		# Can you access sshfs mounted files as root? (You can become root by typing "sudo su -".) What happens?
	* Look at inode numbers in local and remote filesystems (as reported by ls -i). How do they compare?		# Look at inode numbers in local and remote filesystems (as reported by ls -i). How do they compare?
	* dd a large file to local drive. Do same thing over sshfs. Which is faster?		# dd a large file to local drive. Do same thing over sshfs. Which is faster? (What is a large file in this context?)
	* Can you sshfs to the SCS systems (e.g., access.scs.carleton.ca)?		# Can you sshfs to the SCS systems (e.g., access.scs.carleton.ca)?
	* Setup password-less login to the SCS system (and then undo it).		# Setup password-less login to the SCS system (and then undo it).
			# How can you use the mount command to unmount a sshfs-mounted filesystem (rather than fusermount)?

2017-11-24T00:11:56Z

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			'''This tutorial is not yet finalized.'''

	In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [https://github.com/libfuse/libfuse FUSE].		In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [https://github.com/libfuse/libfuse FUSE].

2017-11-24T00:11:27Z

Things to explore before the end of tutorial

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	Note I expect the above to be a bit confusing. Do look around for resources on public key cryptography; however, you may find that playing around with ssh authentication may help you understand things better. In particular, try using "-v" (verbose) with ssh.		Note I expect the above to be a bit confusing. Do look around for resources on public key cryptography; however, you may find that playing around with ssh authentication may help you understand things better. In particular, try using "-v" (verbose) with ssh.

	==~~=Things to explore before the end of tutorial=~~==		==Tasks==

	* Look at the hard link counts of files locally and compare those to the link counts over sshfs. How do they compare?		* Look at the hard link counts of files locally and compare those to the link counts over sshfs. How do they compare?
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	* Can you sshfs to the SCS systems (e.g., access.scs.carleton.ca)?		* Can you sshfs to the SCS systems (e.g., access.scs.carleton.ca)?
	* Setup password-less login to the SCS system (and then undo it).		* Setup password-less login to the SCS system (and then undo it).

	~~You should be able to do all of the above before you leave tutorial.~~

2017-11-24T00:07:23Z

← Older revision		Revision as of 00:07, 24 November 2017
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	In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [~~http~~://~~fuse~~.~~sourceforge.net~~/ FUSE].		In this tutorial you will be learning about [http://www.openssh.org ssh (openssh)] and [https://github.com/libfuse/sshfs sshfs], a network filesystem built on [https://github.com/libfuse/libfuse FUSE].

	===Setup===		===Setup===