A Technical I.T./DevOps Blog
Problem scenario
You have a .js file on your desktop or on a web server. You want to have the code execute and present itself nicely (not just see the raw code) in a web browser. How do you do this?
Solution
You must use the .html extension. You must have
<html</html
tags. Here is an example. Name this file contint.html and place it on your desktop,
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Continue reading “How Do You Get JavaScript to Present in a Web Browser?”
Problem scenario
You recently migrated to WordPress. There are small windows of text on the left or right side of your blog. They are not posts. You do not know how to modify them. What should you do to modify them or add advertisement banners to your website?
Solution
These sidebar text rectangles are called “Footers” in WordPress. To modify them,
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Continue reading “How Do You Get to the Small Windows (aka Widgets) in WordPress?”
Problem scenario
You have a web page that you access from the front-end (e.g., a web browser). You want to see if there is a hyperlink on the page that goes to a certain URL. You know the web page and the URL, but you are not sure if a hyperlink on the website has such a link. What should you do?
Solution
Use the curl command.
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Continue reading “How Do You Programmatically Search Hyperlinks on a Given Webpage?”
Problem scenario
You want more verbose log capturing in Nginx. What should you do?
Solution
1. Make a back up of nginx.conf. Then open it. It is often in /etc/nginx/nginx.conf. (Some versions of nginx have a file that does some of the same things called default.conf. This will be the file you will need if you have no nginx.conf file.)
2.
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Continue reading “How Do You Capture More Events in the Nginx Logs?”
Problem scenario
You deployed Apache Mesos. The web UI is having problems. You see the error “Failed to connect to x.x.x.x:5050.” What should you do?
Solution
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Problem scenario
You want a REST API endpoint. How do you create a URL that is a proof-of-concept to trigger a Python program?
Solution
Prerequisites
i. You have installed Python 3. If you are using CentOS/RHEL/Fedora, run this: sudo yum -y install python3
ii. You need a web server installed. If you do not have one,
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Problem scenario
In Chrome you deleted browsing data including cookies and autofill form data. You closed the browser and reopen it, but old URLs still show up. What should you do?
Solution
Go to History -Clear browsing data -and go to “Time Range” (the drop down menu). Choose “All time” and then go to “Clear data”.
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Continue reading “How Do You Delete Browser Data from Chrome when Your First Attempt Failed?”
Problem scenario
You can download a file with Lynx and wget. But curl is not working. What should you do?
Solution
First, try to curl the web page without redirecting the output. If the curl command creates a file, it does not necessarily give you an accurate depiction. You may want to examine the file with a text editor. What you see without redirecting the output to a file (that is allowing the output to echo to the screen) may provide a clue.
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Continue reading “How Do You Get curl to Work when the Web Page is Working?”
Problem scenario
You notice that on some Linux servers the /etc/hosts file controls the resolution of hostnames and on other servers the DNS server overrides the /etc/hosts file. Which has precedence in DNS resolution, /etc/hosts or the DNS server on the network?
Answer
It depends. The /etc/nsswitch.conf file will decide. There is a “hosts” stanza. This setting will have the DNS server override the /etc/hosts file:
hosts:dns files
This setting will have the /etc/hosts file take precedence for name resolution:
hosts:files dns
To get the hostname,
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Problem scenario
You want Debian/Ubuntu Linux to support a website. You want a Python program to run every time a web page is downloaded. How do you get a PHP program to invoke a Python program on Debian/Ubuntu Linux?
Solution
Prerequisites
i. This assumes you have Apache2 and PHP installed. If you need assistance run this: sudo apt -y install apache2 php
ii.
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Continue reading “How Do You Get a PHP Program to Invoke a Python Program via Browsing a Website?”