It is fun to know that Arduino boards has voltmeter & thermometer but that knowledge has not much use. Arduino hidden voltmeter & thermometer are features of AVR chips for the chips themselves. Not all Arduino AVR chips will have the thermometer. With hardware and software updates, old codes to demonstrate may not work at all. The thermometer has entry on official Arduino website with list … [Read more...]
How To Install netdata on Ubuntu 16.04 (Apache2, Cloud Server)
Previously we talked about a good tool named GoAccess for traffic analysis. netdata is similar quality good tool which provides a web ui for monitoring, log analysis and other sysadmin works. Here is how to install netdata on Ubuntu 16.04 running Apache2 on single cloud server. Installing on server running Apache2 is just easy. There is huge documentations on netdata's official Github repo's Wiki. … [Read more...]
What Are Arduino Relay Modules, What They Do?
Definitely you have noticed the Arduino Relay Modules on Ebay, Amazon like online shops or may be on some blog sites. Many obviously wonder and ask what are Arduino Relay Modules, what they do? In very short, these relay modules isolate two circuits so that we can control 230V appliances with Arduino using relay. As the matter is with live 230V connection, not 9V battery, usage must be by adults. … [Read more...]
How To Install Apache Ambari on Ubuntu 16.04 to Manage Hadoop Cluster
Apache Ambari helps in management, monitoring, provisioning of Hadoop cluster. Here is how to install Apache Ambari on Ubuntu 16.04 to manage Hadoop cluster. Ambari Server uses an embedded PostgreSQL database by default. When we install the Ambari Server, PostgreSQL packages and dependencies must be available for install. We are showing example with repo from Hortonworks for many reasons, one of … [Read more...]
Brute Force SSH Test Own Server With ncrack, hydra, medusa
If we use these purely hacking tools, we can really check how our servers appear to a black hat hacker. It is normal not to know how to use them by a relatively new sysadmin. These will give you idea why odd log entries appear too. Here is real life way to brute force SSH test own server with ncrack, hydra, medusa. These are no way closest to real black hat hackers work. They will have many … [Read more...]
Types of Fuses, Fuseholders Used in DIY & Household
Thomas Edison has patent on fuse. Fuse provides overcurrent protection to a circuit using basic theory. Thomas Edison never discovered incandescent bulb but he discovered the Edison screw mount and modified filament. Thomas Edison has not discovered fuse too. Who discovered fuse that is not known, he added a standard and Louis Breguet recommended such thing in mid 1850. There is another similar … [Read more...]
What Are rel=”noopener”, rel=”noreferrer”?
Hyperlinks links point to another webpage and link relationships explains why we are pointing so. The question what are rel="noopener", rel="noreferrer" appearing because latest versions of WordPress has rel="noopener", rel="noreferrer" on link in visual editing mode. Another such link relationship was discussed previously -- rel="author" and rel="me" in WordPress in the easiest … [Read more...]
Types of Electrical Switches Used in DIY & Household
In DIY works, theoretical knowledge around them becomes a barrier - it happens that you noticed a thing in use and understood to be appropriate but the name is unknown to you. We are saying the theoretical English nomenclatures, for few in real life technicians to the shops refer them with different sounding name which goes worser in the non-English speaking countries. Here are the common types of … [Read more...]
How To Process Server Log in Hadoop, Pig : Free IBM Analytics Demo Cloud
In our previously published guides, we talked about installing Hadoop, installing Pig on own server. We also talked about free IBM Analytics Demo Cloud with needed softwares pre-installed, ready to use. Here is basic example with commands to show how to process server log in Hadoop, Pig can be done using free IBM Analytics Demo Cloud. This guide can be followed by even who never used Hadoop or … [Read more...]
Compatibility of Our Existing OpenStack Guides For IBM OpenStack
In recent times we noticed that peoples are searching around IBM OpenStack things. We have many guides on HP Cloud, Rackspace OpenStack. Here is disclaimer & short note on compatibility of our existing OpenStack guides for IBM OpenStack. Intended audience already know about what is OpenStack. We are talking about the IaaS, storage users of OpenStack installation by HP, IBM, Rackspace; not … [Read more...]
How To Install Apache Pig On Ubuntu 16.04
Apache Pig is intended for analyzing large data sets. Usually we combine Pig with Hadoop. The language of Pig is Pig Latin. Apache Pig can execute Hadoop jobs in MapReduce, Apache Tez, Apache Spark. Pig Latin has similarities with SQL for relational database management. Pig Latin can be extended with scripts written in Java, Python, JavaScript, Ruby, Groovy. Here is How To Install Apache Pig On … [Read more...]