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Jan
20th

Linux: 20 Iptables Examples For New SysAdmins

Author: Vivek Gite | Files under syndicated

Linux comes with a host based firewall called Netfilter. This Linux based firewall is controlled by the program called iptables to handles filtering for IPv4, and ip6tables handles filtering for IPv6. I strongly recommend that you first read our quick …


Jan
20th

How To Patch and Protect Linux Kernel Zero Day Vulnerability CVE-2016-0728 [ 19/Jan/2016 ]

Author: Vivek Gite | Files under syndicated

A very serious security problem has been found in the Linux kernel. A 0-day local privilege escalation vulnerability has existed since 2012. This bug affects millions of Android or Linux applications to escalate privileges. Any server or desktop (32 or…


Jan
15th

How To Patch and Protect OpenSSH Client Vulnerability CVE-0216-0777 and CVE-0216-0778 on Linux

Author: Vivek Gite | Files under syndicated

A serious security problem has been found and patched in the OpenSSH software. Two vulnerabilities have been discovered in OpenSSH on 14/Jan/2016. All OpenSSH versions between 5.4 and 7.1 are vulnerable. A man-in-the-middle kind of attack identified an…


Dec
23rd

Avoid These Mistakes While Moving Your Business to Cloud

Author: Kelvin Smith | Files under syndicated

cloud

 

Cloud, Cloud, Cloud – isn’t it too cloudy now-a-days! No, no it’s not about the weather, it’s the business where everything is too cloudy. Businesses have started moving towards cloud rapidly. That’s because of the benefits it offers – reliability, scalability and accessibility. There’s no doubt that the cloud computing industry is flourishing at a rapid pace and over past 5 to 10 years, there has been tremendous growth in this industry. Approximately, 72% of organizations have adopted the cloud technology and it’s likely to grow up to 91%, within three years from now.

You might think that adopting or migrating a business over to cloud platform/s would be a simple and easy process, but that’s not the case entirely. Desire to grow profit margins, competition and other business considerations keep driving entrepreneurs towards the adoption of Software-as-a-Service delivery model and cloud-based provisioning of their offerings. Though moving to cloud can be a cost-effective idea but it may also lead to failure if you don’t prepare your business well for its migration. While moving to cloud server hosting, things like capacity, security, reliability and employee training are vital, we MUST keep this in mind.

Let’s prepare ourselves by taking a look at the common mistakes when it comes to cloud migration –

  • Assume all clouds are created equal –

All cloud services offerings are same, right? Nope, there isn’t a single point matching between them. Yes, cloud is divided basically into three categories – private, public and hybrid. But beyond these three, services are categorized as per the pros and cons too. Selecting the right cloud mix depends on your specified requirements along with the applications and infrastructure wherein you have already invested. For instance, a private cloud may offer greater flexibility and less scalability. So, at initial stage its better off working with a public cloud vendor for smoother cloud migration experience.

 

  • Assume disaster recovery is the responsibility of the cloud provider

One of the biggest challenge in the cloud environment is the application downtime at least in a base metal infrastructure. It’s completely your responsibility to ensure that the application required is available through cloud outages and service disruptions. Remember to keep and recover backup similar to that for any mission-critical application to keep downtime to minimum.

 

  • Ignoring varying performance of different cloud providers –

It’s a common sense that performance of different cloud hosting providers will be different in different regions depending upon how one takes an advantage of the provider’s infrastructure and services. It might be any setup offered to you, your application is going to act in a unique manner. It depends on you, to plan for specific performance levels and prepare to twist them until your goal is reached.

 

  • Migrating all apps to cloud –

Don’t make this mistake of migrating all business apps to the cloud. Instead you may choose a different approach for every application that is run. Assuming that all the apps are taken care of by the cloud service provider (CSP) is a misconception. CSPs are responsible for securing your business data but they don’t by default manage to secure your servers, virtual network, data or applications. For securing the applications companies need to plan and finance for internal resources or outside 3rd party system integrators. Once initial configuration is done, it’s the responsibility of the company to continue monitoring, managing and remediating possible security threats to their systems.

 

  • The lack of understanding of Total Cost of Ownership (TCO) once the cloud is deployed –

There are complex methods that are required to determine that will there be cost saving of your company with cloud but most enterprise IT shops aren’t willing to count the numbers. It is essential to have use-based accounting and cloud financial management systems available to monitor the actual cost impact and value of migrated cloud-based applications.

 

  • Neglecting Connectivity

While moving your website to the cloud, ensure your way to access the cloud is reliable i.e. check on whether your internet connection is strong. Usually, large companies prefer to choose low storage pricing, neglecting the internet connectivity. It may happen that your current broadband is unable to keep up with the demands of cloud storage. Fiber-based products, leased lines, EoFFTC and EFM provide faster and stable connections which can meet the demands of cloud storage and they have fixed repair SLAs.

 

  • Looking only at short-term objectives

Don’t plan on short-term objectives when you are thinking to move towards cloud. Simply thinking that what cloud can do for me right now isn’t going to work. It will only limit your future capabilities and may lead to accidental design limitations which could have been easily avoided with long term planning.

 

  • Failure to plan for the unexpected –

As an entrepreneur, you should be ready for the various possible outcomes when you are using cloud for disaster recovery or for running application workloads. Not planning for these may lead to significant consequences from business interruption to impacts to the bottom line. For instance, what if cloud is breached? Can the cloud administrators view the confidential data? What if the cloud provider’s business goes down? All these questions should be given a thought upon.

 

Summarizing the content, memorize that there isn’t any harm in migrating to cloud but don’t underestimate some points before your movement. These are some of the common mistakes that entrepreneurs do repeatedly that results into downfall of business.


Dec
21st

Linux: Use smartctl To Check Disk Behind Adaptec RAID Controllers

Author: Vivek Gite | Files under syndicated

I can use the “smartctl -d ata -a /dev/sdb” command to read hard disk health status directly connected to my system. But, how do I read smartctl command to check SAS or SCSI disk behind Adaptec RAID controller from the shell prompt on Linux operating s…


Dec
18th

Linux: Find Out If a Website Powered By Apache Is Using Gzip or Deflate Support To Compress Files

Author: Vivek Gite | Files under syndicated

When content is compressed, downloads are faster because the files are smaller—in many cases, less than a quarter the size of the original. This is very useful for JavaScript and CSS files (including html), faster downloads translates into faster rendering of web pages for end-user. But, how do I find out if a web-page is gzipped or compressed using Unix command line utility called curl? How do I make sure mod_deflate or mod_gzip is working under Apache web server?

Read more…


Dec
18th

CentOS / RHEL: Install iftop To Display Bandwidth Usage Per interface By Host

Author: Vivek Gite | Files under syndicated

Want to find what is using all of your bandwidth on Linux server? Try iftop tool. This command listens to network traffic on a given interface (such as eth0 or eth1), and shows a table of current bandwidth usage by pairs of hosts. iftop must be run wit…


Dec
16th

How To Avoid Sudden Outburst Of Backup Shell Script or Program Disk I/O on Linux

Author: Vivek Gite | Files under syndicated

A sudden outburst of violent disk I/O activity can bring down your email or web server. Usually, a web, mysql or email server serving millions and millions pages per months are prone to this kind of problem. Backup activity can increase current system …


Dec
14th

How To Read CPUID Instruction For Each CPU on Linux With x86info and cpuid Commands

Author: Vivek Gite | Files under syndicated

Is there a CPU-Z like a freeware/open source software that detects the central processing unit (CPU) of a modern personal computer in Linux operating system? How can I get detailed information about the CPU(s) gathered from the CPUID instruction, inclu…


Dec
13th

How To Find Out if AES-NI (Advanced Encryption) Enabled on Linux System

Author: Vivek Gite | Files under syndicated

The Intel Advanced Encryption Standard (AES) or New Instructions (AES-NI) engine enables extremely fast hardware encryption and decryption for openssl, ssh, vpn, Linux full disk encryption and more. How do I check support for Intel or AMD AES-NI is loa…