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Linux systems – monitoring

October 27th, 2011

Sanjib

Monitoring a system is an essential part of system administration and a regular monitoring/checking will only make sure that everything is in order. There are several things to monitor in a server, viz user accounts, CPU or memory loads and network traffics.

We will start with the user accounts. In the previous post I have already discussed about the security issues related to user accounts and the reason a good password policy is required and how to implement it. Also how to check if an user is trying to use incorrect password to login or attempting for su privilege. A few basic commands to monitor user accounts are : (more…)

Posted in General, Open Source, Tips and Tricks

Tags: Central Processing Unit, Computing, CPU, Daemon, Delete user, delete username, few more effective tools, Filesystem Hierarchy Standard, Linux, loads, lock user, lock username, memory, monitoring, network traffics, Password, password policy, remove user, remove username, sar, sar command, SCSI, strong password, Su, Sudo, systat, System administration, system administrator, system monitor, System software, Technology/Internet, top, unlock user, unlock username, User, user administration, user monitor, Virtual memory

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Securing and Hardening Red Hat Linux

October 26th, 2011

Sanjib

Securing or Hardening a system is one of the primary tasks for any system administrator. A lot many things can be tweaked to make your system secure and I will point out a few of the standard baseline to make a linux box secure. I will not cover services or applications like Apache or Samba or Squid etc., since these are not needed for all linux systems. Also, security features requiring kernel patching is not covered. (more…)

Posted in General, Open Source, Tips and Tricks

Tags: Close unwanted Ports, disable root login, failed login, Hardening, Linux, listening ports, lock accounts, network monitor, OS, package removal, password ageing, password policy, patch management, patching linux system, Red Hat Runlevel System Services, Secure Shell, secure ssh, securing, Security, ssh, strong password, up2date, update

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Linux Comprehensive – back to basics

October 25th, 2011

Sanjib

I am not sure about the title used in this post but I couldn’t think of a better one. Many elementary and tricky questions are asked to a Linux professional when interviewed for a job. So I wanted to accumulate as much as possible so that someone ( more for me) can go through the article and get prepared for the interview or even know about a certain thing related to Linux system administration in a quick readout. (more…)

Posted in General, Open Source, Tips and Tricks

Tags: basic, boot, boot sector, booting process, comprehensive, file, file types, filesystem, Initrd, Inode, inode number, inode table., Kernel, kernel compilation, kernel update, Linux, manual install, MBR, modular kernel, Monolithic kernel, operating system, ramdisk, rpm, tutorial, update

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Ubuntu security

March 10th, 2010

Sanjib

I am not a security expert but I have implemented a few of these measures in my Ubuntu box and so thought about discussing about it. Please know that implementing these features will not make your box fully secure. You can discuss or find solutions for any security issues in the Ubuntu Forum

The two features I will discuss is ssh, as you let peoples walk in your machine through these applications.

SSH( Secure Shell Access) normally use password authentication to let peoples in. Firstly you will make up your mind if you at all need to have a ssh connection to your machine. If not, you can disable ssh from the Synaptic Package Manager. If you need the ssh connection to your machine, then change the port for it. Default port for ssh is 22 . Use the following method to change the port (more…)

Posted in General, Open Source, Tips and Tricks

Tags: Authentication, Computer network security, Computer networking, Computing, Cryptographic protocols, Cryptographic software, Cryptography, Default port, find solutions, Grace Time, Human Interest, Internet protocols, OpenSSH, Password, Secure Shell, Ssh-agent, Synaptic Package Manager, System software, Ubuntu, Virtual Network Computing, X Window System

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Cloud Computing

March 9th, 2010

Sanjib

So what is Cloud Computing ?

I was looking around all the definitions on cloud computing over the net but all are too complicated. Finally I found the easiest definition to understand it. Cloud computing is a network of servers that involves delivering hosted services to customers over the Internet. A cloud service has three unique characteristics that differentiates it from traditional hosting. It is sold on demand, typically by the minute or the hour. A user can have as much or as little of a service as they want at any given time and the service is fully managed by the provider . The consumer needs nothing but a personal computer with an internet access.

These services are broadly divided into three categories: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). The name cloud computing was inspired by the cloud symbol that’s often used to represent the Internet in flow charts and diagrams. (more…)

Posted in General, Open Source, Reviews, Web

Tags: Amazon Web Services, Business models, Cloud, Cloud applications, Cloud computing, Cloud infrastructure, Cloud storage, Cloud Strife, Cloud testing, Computing, distributed computing, Everything as a service, few application software, high-speed Internet, Hosted service provider, hosted services, Infrastructure as a service, internet access, ISP, Mass media, name cloud computing, Platform as a service, Rackspace Cloud, Software as a service, Software distribution, Technology/Internet, Virtual private cloud, Web services

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Archive for the ‘Open Source’ Category

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