OPS245 Lab 8 Newversion: Difference between revisions

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= The ''server'' concept =
The latest version of this lab is here: [[OPS245_Lab_8]]
For most people a '''server''' is something on the internet you '''connect to''', and a client is something you connect from. That sort of view is mostly valid, but it breaks down a little when the server and the workstation are the same machine.
 
A couple of examples:
 
* When you connect to wiki.littlesvr.ca in Firefox:
** Firefox is the client, it's making the request for a web page
** The web server (Apache) on wiki.littlesvr.ca is the server, responding the the request with the contents of the web page
* When you use your phone to check your school email:
** The email application on your phone is the client, making the request to get new email
** The school email server (e.g. Postfix, Gmail, Office365) is the server, responding to the request with a list of new emails
 
Most of a Linux system administrator's work is done in a terminal, and most of that is done on remote machines. Few companies can afford to hire in-house administrators, and those that can afford it have too many machines to connect keyboards and monitors to. But everything is connected to a network.
 
The same client-server model applies here. You connect from a terminal on your workstation to the machine you want to work with. In this case:
 
* The '''ssh''' program is the client, connecting to the ssh server, sends what you type to the server and prints the output which those commands print on the server.
* The ssh server (sshd) is the software on the destination machine which receives commands from the client, executes them, and sends the output of those commands back to the client.
 
= Also =
 
* Create an account on ops345.ca for ssh practice
* The "server" concept
* Using ssh to control a remote Linux server
* Remote credentials don't need to match local credentials
* Permissions work the same way, they apply to the user who is logged in
* Practice with permissions on files you own and files you don't own
* Copy files between Linux machines using scp
* Copy directories
* Note how ownership applies to files transferred between systems
 
=Submit evidence of your work=
 
[[Category:OPS145]]

Latest revision as of 13:42, 19 March 2024

The latest version of this lab is here: OPS245_Lab_8

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