A Technical I.T./DevOps Blog
Question
What are the different acronym stacks in I.T.?
Answer
There are many open source combinations of technologies that are in wide use. These acronyms referred to as “full stacks” or “stacks” appear in articles and job descriptions. A full stack is a bundle of software that (includes an OS and) can create a complete and functional product when properly configured.
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Continue reading “What Are the Different Acronym Stacks in I.T.?”
Problem scenario
You are using a RedHat derivative distribution of Linux. You want to install Apache Web Server on it so it can publish PHP content. How do you install and configure the necessary dependencies to do this?
Solution
1. Install Apache web server: sudo yum -y install httpd
2. Install PHP: sudo yum -y install php
3.
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Problem scenario
You want to deploy your own LAMP stack with the power of Kubernetes. You do not want to rely on official Docker Hub images for the underlying Docker containers. How do you do this?
Solution
1. Deploy Kubernetes to AWS. If you need help to deploy Kubernetes to AWS, see this link. If you need assistance installing kubectl on any type of Linux (CentOS/RHEL/Fedora,
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Continue reading “How Do You Deploy a LAMP Stack Application Powered by Kubernetes?”
Problem scenario
You have Linux servers that need Apache web server installed on them. How do you write a Chef recipe to deploy Apache web server?
Solution
Prerequisite
This solution requires that the Chef server must have access to GitHub. If you want to install Chef server, see this posting. If you want to install Chef client, see this posting.
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Continue reading “How Do You Write a Chef Recipe to Deploy a Apache Web Server to Linux Servers?”
Problem scenario
You want to configure the LAMP stack (Linux, Apache web server, MySQL/MariaDB, and PHP) on a running a RedHat distribution of Linux. How do you do this?
Solution
Run this command:
sudo yum -y install php httpd mariadb-server
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Continue reading “How Do You Deploy LAMP to a RedHat/CentOS/Fedora Server?”
Problem scenario
You set up a load balancing mechanism for your Nginx or Apache web server. You want to test it and set up an artificial load of traffic. You want to generate a significant amount of traffic to test the HTTP load balancing mechanism. How do you do this?
Solution
Here are three scripts that can, by themselves, download a web page 100 times when they execute.
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Continue reading “How Do You Generate a Load for Your Nginx or Apache Web Server?”
Problem scenario
You have a LAMP (or LAPP) web page application. The PHP code uses the session() functionality. Once a user logs in successfully, he/she can browse to successive web pages. You want to at least allow the user the opportunity to destroy the session (and terminate the authentication session). How do you do this?
Solution
#1 Modify the .php file that you want to have the logout feature.
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Continue reading “How Do You Create an Option to Logout for a PHP Web Page to Destroy the Session?”
Problem scenario
Your website is not working. When you browse to the login page, the browser loads forever. There seems to be a problem with the web server itself.
On the back end, you run this command from the operating system’s command line:
netstat -anlp | apache2
It produces output like this:
“
[Sun Aug 06 21:03:22.088579 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined
[Sun Aug 06 21:03:22.088682 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_PID_FILE} is not defined
[Sun Aug 06 21:03:22.088697 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_RUN_USER} is not defined
[Sun Aug 06 21:03:22.088701 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_RUN_GROUP} is not defined
[Sun Aug 06 21:03:22.088712 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
[Sun Aug 06 21:03:22.099496 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
[Sun Aug 06 21:03:22.099764 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
[Sun Aug 06 21:03:22.099775 2017] [core:warn] [pid 30144] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
AH00526: Syntax error on line 74 of /etc/apache2/apache2.conf:
Invalid Mutex directory in argument file:${APACHE_LOCK_DIR}
“
What should you do to fix this?
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Problem scenario
Your website is not working. When you browse to the login page, the browser loads forever. There seems to be a problem with the web server itself.
On the back end, you run this command from the operating system’s command line:
netstat -anlp | apache2
You see this as the result of this command:
“AH00558: apache2: Could not reliably determine the server’s fully qualified domain name,
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Problem scenario
You are deploying a LAPP (Linux, Apache, PostgreSQL, and PHP) stack. You want the authentication to be done via a Postgres database behind-the-scenes. You can control the credentials from the back end this way. You want the user to be able to click around in the application once logged in. You want only one challenge for user login credentials.
How do you create a PHP login page (i.e.,
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