Solr is pronounced as Solar. It is an enterprise search platform built on Apache Lucene. Similar type of software is Elastic Search. Elasticsearch is on same Apache Lucene and more commonly used with Kibana, Beats, and Logstash as Elastic Stack for searching, analyzing and visualizing data. Here is how to install Apache Solr 6.x on Ubuntu 16.04. Apache Solr search platform can be integrated with … [Read more...]
Archives for July 2017
How To Remove Query Strings From WordPress For Security
Previously shown how to use the hacking tools like sqlmap to test own WordPress for SQL Injection in White Hat way. We also talked about SQL Injection. Here is how to remove query strings from WordPress for security specially to avoid MySQL injections via PHP files for server running Apache2. For Nginx, we talked about how to remove ?utm_source like query strings in older article. Query strings … [Read more...]
Types of Copper Wires Used in DIY, Household Works
It is common to face guides and tutorials DIY electronics works and household repair like we talked about solid core copper wire in another guide. Here is a brief, easy description with illustration of types of copper wires used in DIY, household works. We will mention the common gauges too so that you face less trouble in real. Copper wire are sold different varieties, and the differences may be … [Read more...]
Install Apache TinkerPop (Gremlin Server) With PHP Client
We are talking about TinkerPop3. TinkerPop is graph computing framework offering 3 parts. 3 packaged downloads includes Gremlin Console, Gremlin Server and the source distribution. TinkerPop is slightly confusing to understand to get started. Here is how to install Apache TinkerPop (Gremlin Server) with PHP client on server. Implementations of TinkerPop are Sqlg, Blaze Graph, TinkerGraph, Elastic … [Read more...]
Arduino Hidden Voltmeter & Thermometer
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...]