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How to deal with AnsibleUndefinedVariable is undefined error

Although Ansible has a low learning curve, obvisouly there’s always a big difference between learning on your own versus working on a medium to large scale size (enterprise) projects....

In Ansible, Feb 27, 2022

How to install Redis on Ubuntu 21.10

Using Redis as popular caching storage and also persistent key value database is always a good idea. Here I’m going to show you how to install it on a fresh Ubuntu 21.10 instance.

In Redis, Feb 26, 2022

How to Flush DNS Cache from the CLI

Clearing the DNS cache usually fixes issues related to not resolving new or updated existing domain records. Let’s see how it’s done from the command line though.

In Linux, Feb 25, 2022

MySQL Fix: 'Waiting for table metadata lock'

Working with high load SQL queries or big transactions, you may face: Waiting for table metadata lock. Here I’m gonna list some useful solutions that might help you.

In MySQL, Feb 24, 2022

How to fix 'WARNING: Connection pool is full' in Docker Compose

If you have been working with docker-compose stacks for a while, you might have come across the following warning message: WARNING: Connection pool is full, discarding connection <...

In Docker, Feb 23, 2022

How to install Docker Compose on Ubuntu 21.10

This article is strictly focused on installing docker-compose on Ubuntu 21.10, so please make sure that you have Docker installed before jumping on the installation steps.

In Docker, Feb 22, 2022

How to Export and Import PostgreSQL tables using CSV

Export and Import operations in PostgreSQL and any other relation database management system for that matter, could include a couple of use-case scenarios, for instance data analysis....

In PostgreSQL, Feb 21, 2022

How to install Nginx on Ubuntu 21.10

Since Ubuntu 21.10 has been released there was an immediate interest in using it as an OS Server. In this tutorial, we are going to see how to install Nginx on Ubuntu 21.10.

In Nginx, Feb 20, 2022

How to Upgrade and Downgrade Extensions in PostgreSQL

Extensions in PostgreSQL are basically packages with additional features. The popular ones include TimescaleDB, PostGIS, pg_stat_statements, ZomboDB and Postgres_fdw. Today’s focus go...

In PostgreSQL, Feb 19, 2022

Apple M1 Chip Docker Error - no matching manifest for linux/arm64/v8

Most of the Docker images are not compatible with the newest Apple Silicon M1 chip throwing no matching manifest for linux/arm64/v8. Let’s see how to resolve the issue.

In Docker, Feb 18, 2022