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Yum duplicate package error can occur anytime and most of the times when servers are under provisioned in terms of hardware capacity like RAM memory or even CPU. This can happen when a small server needs to perform multiple updates that requires more resources than usual making the update process almost impossible. Of course, failure is not an option and we will do our best to explain in this short tutorial how to fix yum duplicate errors by using yum-utils utility. So before we start our little journey fixing those yum errors we must say that this solution has been […]
Category: General | Published: 14/11/2018 | Updated: 14/11/2018MySQL GTID replication error can happen unexpectedly for various reasons and as often as the classic master slave, circular or multi-master replication but in this short tutorial we will learn, step by step, how to skip MySQL GTID transaction error in order to keep in sync our MySQL slave server. Before we begin we need to say that all below steps were tested in a master-slave setup using MySQL 5.6 and MySQL 5.7, we think that this MySQL skipping transaction method detailed below can be easily applied even for newer MySQL versions like 8+. Please note that all below operations […]
Category: MySQL | Published: 28/06/2018 | Updated: 05/11/2018Setup a Private Docker Registry
Setting up a private Docker registry locally for our organisation or maybe for personal use can be seen as a must if we don’t want to expose publicly our custom Docker images. It is true that we can easily get a private repository if we would go for a paid subscription to one of the providers available out there on the market that are offering such services, but why doing so when we can simply do it by ourselves, internally, completely isolated and being under our control. Having a private Docker repository / registry will give us the ability to […]
Category: Docker | Published: 20/12/2019 | Updated: 31/12/2019Changing Kubernetes Pods CIDR (Classless Inter-Domain Routing) is our next tutorial where we will learn in just a few easy steps how to change the network mask / range for our Kubernetes environment. Kubernetes is considered one of the most mature and stable platform for Docker orchestration – at the time of writing this tutorial -, being used in production environments by many big names from the tech industry. Mastering Kubernetes is not an easy task, it really takes time and require a lot of practice, it is well known of having a not so easy learning curve. Here, in […]
Category: Kubernetes | Published: 19/12/2019 | Updated: 22/12/2019NGiNX traffic split or traffic distribution can be very handy in various user cases, for example this can be used to improve security for our websites or web applications. In this particular tutorial we will show you how to make use of this great feature that comes with NGiNX by implementing a simple solution for traffic distribution in order to protect our backend web applications or maybe a websites by simply using two individual backend upstreams. Same traffic management principle using NGiNX, explained below, can be used for various other backend services and solutions within various stacks. Table of contents […]
Category: Security | Published: 03/07/2019 | Updated: 12/08/2019NGiNX Reverse Proxy Caching Setup
NGiNX reverse proxy caching can boost your website or web application loading speed when enabled and properly configured. We all know that NGiNX, at least for now, is one of the best software mainly used for web servers but NGiNX has more amazing capabilities, can be easily used as Reverse Proxy and even as Load Balancer within any stack, can be used in many other cases but these are the common scenarios. In this very short tutorial we will be focusing on its caching capability, more precisely caching with NGiNX when used as Reverse Proxy for backend web servers. Table […]
Category: General | Published: 03/06/2019 | Updated: 07/08/2019