A Technical I.T./DevOps Blog
Problem scenario
You are using a Red Hat derivative of Linux. You want to install Gatling. What do you do?
Solution
Prerequisite
Install Java. If you need assistance, see this posting.
Procedures
1. Run a script with the following content (e.g., name it installgatling.sh and run sudo bash installgatling.sh):
gatlingversion=3.3.1 # change this version as needed. …
Continue reading “How Do You Install Gatling on a CentOS/RHEL/Fedora server?”
Problem scenario
You want a REST API program to write to logs in a serverless way. You want to have a program (or some very basic lines of code to) execute upon certain events happening (e.g., to write intelligent pre-processed logs and potentially gather data from multiple sources). You want to use an Azure PaaS for this. How do you use Azure functions?
Solution
1.
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Problem scenario
You are invoking requests.get() in a Python program (after an “import requests” statement near the top of your code). You want to pass the equivalent of “-X DELETE” in curl in your Python program. How do you use the DELETE option with a REST API call in Python?
Solution
Prerequisites
This assumes you have “requests” installed (e.g., sudo pip install requests).
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Continue reading “What Is the Python Requests Syntax Equivalent of a curl “-X DELETE”?”
Problem scenarios
Your situation is described in one of two ways.
#1 You go to the SonarQube web UI to log in. You see nowhere to log in. You see this error: “Service Unavailable The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.” What should you do?
Or your situation is like this:
#2
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Problem scenario
You have a PHP program that works from the back-end (from a command terminal executing like php foobar.php). When you view the program in a web browser, it is not running the Bash commands properly. What should you do?
Solution
The root cause is probably the user execution context and a variety of permissions or configuration settings on the Linux system.
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Continue reading “How Do You Troubleshoot PHP Not Displaying the Output of a Bash Command?”
Problem scenario
You want to browse the web UI of a web application that you set up on a Linux machine in GCP. How do you get a web service (e.g., Nginx, Apache web server, SonarQube or Jenkins) to work when the server is in Google Cloud Platform?
Solution
Prerequisites
This assumes you have deployed the web application. If you want to deploy Nginx,
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Continue reading “How Do You Get a GCP Server to Present a Website on the Internet?”
Problem scenario
You have an Nginx instance configured to be an HTTP load balancer (aka invisible landing page, pass-through distributor or reverse proxy). You want to analyze the inbound web traffic that your Nginx server is currently receiving. How do you find out how many active connections there are through the load balancer?
Solution
1. Modify the /etc/nginx/conf.d/default.conf file in the Nginx HTTP load balancer.
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Problem scenario
You have a Red Hat distribution of Linux (e.g., CentOS/RHEL/Fedora). How do you install SonarQube?
Solution
Prerequisites
Install the Java Development Kit so you can later take advantage of plugins. If you need assistance with this, see this link.
Procedures
For future reference, at some point the “9.6”s you see below will have to be incremented to a newer version of PostgreSQL.
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Continue reading “How Do You Install SonarQube on a Red Hat Distribution of Linux?”
Problem scenario
You have a web server with an external IP address (e.g., a VPS, an EC-2 instance, a DigitalOcean droplet, a VM in Azure or GCP). You have a domain name, e.g., funexample.com, that you have registered. You want to go to craft a URL foobar.funexample.com to resolve to this web server with an external IP address. Right now when you open a web browser and go to foobar.funexample.com,
…
Continue reading “How Do You Use Amazon Route 53 with a Domain Name?”
Updated on 1/22/19
Problem scenario
You installed Graylog in a Docker container. You open the URL for the server in a web browser. You see this message:
” Server currently unavailable
We are experiencing problems connecting to the Graylog server running on http://127.0.0.1:9000/api. Please verify that the server is healthy and working correctly.
You will be automatically redirected to the previous page once we can connect to the server.
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