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Linux Utility – Understand Linux Crontab Or Cron Expressions To Run Command At Specific Interval

Linux Crontab helps you to run commands, apps or scripts at a custom specific interval. You can schedule the run at the required interval. Crontab runs in background as daemon and check crontab file at /etc/crontab and /etc/cron.*/ directories. These include cron.d/, cron.daily/,  cron.hourly/, cron.monthly/, cron.weekly/ directories. In this article, we’ll discuss the cron expressions and how to configure your commands to run daily, weekly or every minute as per your requirement through Linux Crontab.

How to Install and Configure OpenVPN on OpenSUSE Leap 42.1

In this tutorial, I will show you how to implement a virtual private network using OpenVPNvpn under the Linux operating system OpenSUSE Leap 42.1. VPN or Virtual Private Network is a secure private network over a public network like the internet. A VPN is a secure tunnel trough the internet which protects your data traffic and increases internet privacy and security. Access to the VPN is restricted by secure authentication methods.

Read the complete article: https://www.howtoforge.com/tutorial/how-to-install-and-configure-open-vpn-on-opensuse-leap-42.1/

10 Best File Managers for Linux Systems

File management is so important on a computer that users always want to have a simple and easy to use file manager or file browser. But sometimes having a feature rich and highly configurable…

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IT Trends: Business Efficiency With Open Source

Trying to maximize business efficiencies while staying within a budget is something that keeps CTOs and CIOs up at night.   How to do senior IT leaders manage for change with a flexible infrastructure, especially one that is built on open-source?

Recently, IBM had the opportunity to interview Mike Woster the Chief Revenue Officer and Chief Operating Officer for the Linux Foundation about these exact challenges.  As Linux adoption continues to steadily increase, Mr. Woster has helped build the Linux Foundation to a $65M organization and the home of Linux – and increasingly industry-changing open-source projects such as Cloud Foundry and Blockchain. Mr. Woster is at the forefront of the Linux and open-source movement. He frequently advises senior IT leaders on how best to leverage this burgeoning technology base.

According to Mr. Woster, “Linux is becoming a fundamental building block in any modern IT strategy and the basis for DevOps and Agile development”.  But, how do senior IT leaders join this crowd sourced technology movement in such a tumultuous environment? They are facing the perfect storm of trends that are not only changing the model of how IT is delivered, but how the applications that run on that infrastructure are developed.

These trends are also emerging at a time when the senior IT leaders are under increasing pressure from the Line of Business (LOB) owner. That LOB owner is more tech savvy than ever due to the plethora of complex apps available via a smartphone and the widespread use of personal cloud services.

Read more at IBM Enterprise Linux Insights Blog.

Cloud Foundry Stages a Comeback

A slew of big-name customers suggests that the application platform is finally getting traction. Cloud Foundry Foundation CEO Sam Ramji explains why.

Practically no developers in their right mind want to write an application from scratch and run it on single server anymore. Instead, they want to tap existing services, keep the original coding to a minimum, and test/deploy the finished application in as automated a fashion as possible on scalable infrastructure.

Read more at InfoWorld

IoT Consensus – A Solution Suggestion to the ‘Baskets of Remote’ Problem by Benedikt Herudek

https://www.youtube.com/watch?v=qbzUxuFOYJk?list=PLGeM09tlguZRbcUfg4rmRZ1TjpcQQFfyr

Bitcoin is able to integrate and have endpoints (in Bitcoin terminology ‘wallets’ and ‘miners’) seamlessly talk to each other in a large and dynamic network. Devices and their protocols do not have the ability to seamlessly communicate with other devices. This presentation will try to show where Bitcoin and the underlying Blockchain and Consenus Technology can offer an innovative approach to integrating members of a large and dynamic network.

Migrating 200+ Load Balancers into Apache Mesos – Stephen Salinas, HubSpot

https://www.youtube.com/watch?v=JvuJQmIVdGs

Stephen Salinas discusses some of the benefits of their Mesos-based dynamic load-balancer system: “We condensed I think it was about 225 was the highest limit of that down to less than 10 servers, saving us about 24 grand a month in server costs, which was a pretty cool thing. …”

Efficient Usage of Apache Mesos using Container Hibernation – Kamalakannan Muralidharan, Paypal

https://www.youtube.com/watch?v=OJgmfog0e1w

In his MesosCon presentation, Kamalakannan Muralidharan discusses the flexibility and agility that is possible with Mesos: “Even though Mesos is good at handling a cluster, somebody has to provision and make it available for Mesos to use the cluster. …”

How We Built a Chargeback System for Twitter’s Compute Platform (Mesos/Aurora)

https://www.youtube.com/watch?v=QaaEjJVVd44

Twitter’s compute platform manages thousands of containers across thousands of hosts. But they had no way of knowing if containers were sized properly and using hardware efficiently, couldn’t tell who owned which containers and services, and couldn’t track resource use by container. Micheal Benedict and Jeyappragash Jeyakeerthi (JJ for short) built their Chargeback system on Mesos to answer these questions.

Running Cassandra on Apache Mesos Across Multiple Datacenters at Uber

https://www.youtube.com/watch?v=U2jFLx8NNro

Dr. Abhishek Verma, first author of the Google Borg Paper, describes using the Apache Cassandra database and Apache Mesos to build a fluid, efficient cluster of geographically diverse datacenters.