Disk partitions Hello started the very last section of our entire course, which is called Storage Management. And in this we get to learn how to create how to list create delete partitions on MBR and GPT kind of disks. So a disk can be used as a simple entity or broken up into one or more partitions that generally call dev SDA or dev SDB, et cetera in physical servers or Escalate, even though they’ve got IDs at our SAS interfaces and deva ordev et cetera. In virtual machines,…

The SSH server configuration Hello and welcome students. In this lecture we’re going to talk about Configuring SSH server which is a secure shell. And this is how you log in from a Windows machine to the Linux machine or between two Linux machines. SSH is a secure way to login. It runs on 422 by default. However you can change it and some people do change it in order to improve security. So in order to find out what version of secure shell are you running, type SSH capital…

Packet Filtering – 3 Opening up a whole interface to incoming packets may not be restrictive enough, and you may want more control as to what to allow and what to reject. Let’s suppose we have a small network of computers that use the 192 168 private address. We can open up our firewall to incoming packets from a single trusted IP address. For example 192. So the way we do that is iptables ainput s 192 jaccept so if you were to break this command down, we first appended…

Runtime ip configuration Hello and welcome students. We are starting the network module now and in this lecture I’m going to discuss the IP configuration in Linux. So IP configuration can be looked at in two different ways in Linux. One is called the Runtime configuration which is temporary, which you can run or used while the system is running right now. You can test it, you can run commands. It’ll give you current information on your system. The other one is called persistent configuration. So for runtime configuration. The…

Useradd command Hello and welcome again. In this lecture we’re gonna create, modify and delete user account. So let’s start. So the command that is used for user ad is sorry to create a user is user ad and the options are what options you want to use and then the user name and the default setting for a new user can be viewed and modified using the D option. So if I were to do user add d, it gives me all the default options that are available. But…

Changing kernel parameter persistant and non-persistant In this lecture we’re going to talk about how to change kernel runtime parameters in a persistent and no persistent way. You can use the command line in a running system to alter certain runtime kernel parameters as a onetime modification or permanently by editing a configuration ration file. Thus you are allowed to enable or disable kernel parameters on the fly without much difficulty when it is needed due to a required change in the way the system is expected to operate. The…

Processes So in server administration is very important to understand how the running processes work in detail from high load to slow response time processes. When your server becomes so slow or fails to respond, you should understand the process management. Or Linux process management in specific to an action when it is the time to kill a process or Renite it and high how to monitor the currently running processes and how these processes affect the system load. Let’s see. How Linux Process Management will help us tune the…

system So let’s talk about starting the system D process. We are still in the booting section of Linux system and we are going through different steps of it. So the kernel starts the system D process with the process ID of PID one. As we discussed in the last lecture, system D is the first process that starts after the system boots and is the final process that is running when the system shuts down. It controls the final stages of booting and prepares the system for use. It…

Boot process Hello and welcome again, students. This is the beginning of our domain two of the LFCs certification course, and the first item that we’re going to pick in it is the Linux boot process. So let’s start on that. So it is important to understand the Linux boot process to troubleshoot boot problems. These are high level steps in the boot process. You need to be aware of files involved in the boot process because errors in these files can cause boot problems. If there’s an issue during…

The waste of Overprocessing Welcome back everyone. By now you have a general understanding of waste and have probably began to see and identify many examples of the eight types of muda within your organization. In order to understand each form of waste at a more advanced level, we’re going to look at each letter in detail in Mrs. Mr. Tim Wood’s name. In this section, we will look at the waste of overprocessing. By the end of this lecture, you will clearly understand why we’ve always done it this…