Tag Archives: code

Installing SonarQube on CentOS/RHEL

The following webpage has detailed instructions for installing and configuring SonarQube on a RHEL/CentOS 7 Linux server (real or virtual) and it was one of the best guides I’ve seen (and I’ve reviewed half a dozen):

The webpage  outlines how to update your Linux server, how to install MySQL (as a data repository) on it, and how to then install SonarQube software on the server.

Some things to note. First, this procedures has you using wget to get v6.0 of SonarQube:

Check out the page https://www.sonarqube.org/downloads/ and see the latest version of SonarQube (e.g. 6.4) and replace “sonarqube-6.0.zip” with the latest version (e.g. “sonarqub-6.4.zip”.)

One important thing to note: this procedure creates a userid and database called sonarqube.

Later in the process, the changes made to /opt/sonarqube/conf/sonar.properties needs to match this:

sonar.jdbc.username=sonarqube                                   sonar.jdbc.password=password

If the userid, password and database you created in MySQL do not match what it is the sonar.properties file, you will see cannot connect to the database errors in the /opt/sonarqube/logs/web.log file and SonarQube will not come up.

Once you enter: sudo ./sonar.sh start

Get the IP address of the SonarQube server and then go to a browser and enter:


My mixed bag of IT links for December

Like previous collections of IT links, this collection reflects things I am interested in or found useful recently:

  1. If you want to get started using APIs, I recommend this: Most Popular APIs Used at Hackathons | ProgrammableWeb
  2. If you want to build that web site, consider Using Twitter Bootstrap with Node.js, Express and Jade – Andrea Grandi, and this Building a Website from Scratch with ExpressJS and Bootstrap | Codementor. Also Mastering MEAN: Introducing the MEAN stack and Bluemix Mobile, Part 1: Creating a Store Catalog application – Bluemix Blog
  3. Or develop a mobile app like this: Create Swift mobile apps with IBM Watson services – developerWorks Courses
  4. I am a fan of Bluemix and Eclipse. This article ties them nicely together: IBM Bluemix – Eclipse Package Download – Neon release.
  5. I am also a fan of IoT these days. For fellow IoT fans, these links are good: Intro to Hardware Hacking on the Arduino — Julia H Grace and $10 DIY Wifi Smart Button | SimpleIOThings.
  6. Speaking of IoT, if you have been doing some work with Arduinos, you might be interested in the ESP8266. Some good info on it here ESP8266 Thing Hookup Guide – learn.sparkfun.com and a good thing to do with it, here: SimpleIOThings | Simple Do-It-Yourself Internet-of-Things Projects
  7. More good links related to software and application development work here Migrate an app from Heroku to Bluemix and here A Concise Introduction To Prolog, plus Building without an Ounce of Code – Part 2 – Apps Without Code Blog and this Turning a form element into JSON and submiting it via jQuery – Developer Drive
  8. Some interesting links pertaining to Minecraft: Can Minecraft teach kids how to code? – Safari Blog and Minecraft and Bluemix, Part 1: Running Minecraft servers within Docker.
  9. There’s lots of talk about AI these days, the  Economist explains why artificial intelligence is enjoying a renaissance
  10. If you are interesting in working in IT, you might like this: How to Get a Job In Deep Learning or this: An Unconventional Guide for Getting a Software Engineering Job — Julia H Grace
  11. Or maybe you want start a start-up. If so, check this out: A Free Course from Y Combinator Taught at Stanford | Open Culture
  12. Finally, here are just a number of interesting but mostly unrelated links:
    1. IBM Blockchain 101: Quick-start guide for developers
    2. Building three-tier architectures with security groups | AWS Blog
    3. Performance Tuning Apache and MySQL for Drupal
    4. How to secure an Ubuntu 16.04 LTS server 
    5. Clean Your System and Free Disk Space | BleachBit
    6. Use an iPad as a Raspberry Pi display — Kano OS – YouTube
    7. (Software iSCSI) Configuring SAN boot on Red Hat Enterprise Linux 5 or 6 series


ICYMI: What is code, by Paul Ford

Happy Monday! Are you affected by code at work? Of course you are! Do you code at work yourself? Very likely, even if it is to use formulae in a spreadsheet program like Excel (which, years ago, would have required been considered coding). However code affects you, I highly recommend you read this:
Code. It’s a very rich piece on code (i.e. software) and what it means to you (and everyone else).

Among other things, it is brilliantly designed. Lots of hard work went into this piece. If you can’t get started yet this week at work, read this as a research project.

Are you trying to learn to code? Are you finding it difficult?

It’s likely not you. As this piece argues, Learnable Programming, there are limits to the approaches that online sites have which many can get by, but some cannot. If you are in the latter group, give this piece a read. Afterwards you might think: aha! That’s why I couldn’t get it!

With technology, if you don’t understand something, don’t assume the problem lies with you. It may, but most of the time, the problem lies with the technology.

A return to Twitter (not the service, but the community)

After the frustration with the Twitter service for changes like this, I thought I would give up Twitter. However, Twitter is the sum of a number of parts: there is the service that Twitter provides, from the backend servers to the APIs to the user interfaces and client software you use;  and then there are the people that contribute to Twitter. Among those contributors are people I really enjoy socializing with whom I cannot connect with any other way. To give up all of Twitter means tossing out the baby, the bathwater and even the tub itself. That’s dumb. (I do dumb things often, but typically correct most of them in time. :))

To get around that, I decided to use my limited software skills and the APIs that Twitter provides to write my own Twitter client, in a way. It is a hack, but it is a good hack (for me). I am able to control what I see this way. Not only do I not have promoted tweets, etc., in my feed, but I am able to get rid of things like RTs from everyone, rather than having to turn of RTs one at a time. I’m also able to save all the tweets in a spreadsheet or some other format, so I can look at them when I am less busy, or decide on other filters I want to apply, etc. Later on I can write more filters so if a trending topic gets to be too much, I can just delete it or save it to a different file for later.

Now my Twitter experience is gone from poor to great (for me).  I have thrown out the dirty bath water, but kept the tub and the baby. This makes more sense, obviously.

Last but not least, I appreciate all the people who expressed concern over my leaving Twitter. It was very kind of you, and why I want to stick around, if I can.