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In such fashion, a web server provides web services. The task performed by a server is called a service. As mentioned before, servers are essentially programs, often started by the system itself at boot time. How is the process hierarchy represented by ps?Ĭ. Note: The process information for the nginx service is highlighted. Use –ejH options to display the currently running process tree after starting the nginx webserver with elevated privileges. The ps command can also be used to display such process hierarchy. In Linux, programs can also call other programs. Some processes do not belong to the analyst user and may not be displayed if ps was executed as analyst, which is a regular user account.ī. Why was it necessary to run ps as root (prefacing the command with sudo)? Note: The output of your ps command will differ because it will be based on the state of your CyberOps Workstation VM.Ī. In Linux, running programs are also called processes. Many programs run in the background so users may not immediately detect what programs are running on a given computer. Many different programs can be running on a given computer, especially a computer running a Linux operating system. Step 2: Display the services currently running.
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To access the command line, click the terminal icon located in the Dock, at the bottom of VM screen. The account analyst is used as the example user account throughout this lab.ī.
#Linux telnet server password#
Log on to the CyberOps Workstation VM as the analyst, using the password cyberops. This lab focuses on IP network-based servers and clients. Many different client-server communication technologies can be used, with the most common being IP networks. Clients, which are also programs, reach out to the server, place the request, and wait for the server response. Servers are essentially programs written to provide specific information upon request. Instructor Note: This lab can be done using the virtual machine created in a previous lab. Part 2: Using Telnet to Test TCP Services.In this lab, you will use the Linux command line to identify servers running on a given computer. Instructor Note: Red font color or gray highlights indicate text that appears in the instructor copy only. 4.3.4 Lab – Linux Servers (Instructor Version)