This article, I will show you how to configure DKIM for Zimbra mail server 8.8.12. What is DKIM? Why do we have to configure it? And how do we configure DKIM in Zimbra? How do mail servers block spam? You have successfully installed Zimbra mail server, but that is not enough. Now, you can email

In this article, I will guide you to install Zimbra mail server in CentOS 7. Over the last 2 articles in this serie, you have finished preparing the server for installing Zimbra. Now we will do that. Remove Postfix and install dependencies First, you need to turn off the Postfix service if it is running.

In this article, I will show you how to install NTP and DNS for Zimbra mail server. As in the previous article, you have prepared a server to install Zimbra. Now, we will continue to prepare NTP and DNS for mail servers. Install and set up NTP service There is a service that quite a

This article will talk about Prepare to install Zimbra mail server 8.8.12 Introducing Zimbra mail server For those who don’t know about Zimbra, I’ll talk briefly about it so you can understand it. Zimbra is an open source solution for mail servers. You can get used to Gsuite from Google or Microsoft Office 365. For

Before we go into installing the Rocket Chat system, the first thing to do is to determine the system resource. This article I will talk about sizing the Rocket chat system. Determine the size of your organization You need to determine how many users your company has? 50, 100, 500, 1000, 2000 or 5000 users.

Have you heard of Rocket Chat? What is it? This article will introduce to you about the Rocket Chat system. Demand from companies Many companies have employees who use Skype to chat with each other, send and receive job information. It is a great tool. But there is a problem, information can be leaked by

How to list the tag of a container image? In the previous article, you already know what the tag of an image container is. On the Docker Hub website, you can see all the tags easily. But if you use the search command, how can you list all tags of an image? Docker registry API

This article will show you how to search for a container image. Thereby you will get the image you need to launch the container. Docker Hub First, I have to talk about Docker Hub. This is a huge Docker library, it contains image containers here and allows you to download. Docker Hub is a place

How to install MongoDB in CentOS 7? This article will guide you step by step how to install it successfully. MongoDB is a well-known database type, many large systems are using it, especially the development of IoT. Add MongoDB repository to the server First, just like database types like MariaDB, MongoDB allows you to install

How to fix error disk read-only in VestaCP server after reboot? Today I will share with you an error I encountered when using VestaCP. Describe the error situation I use a CentOS 7.6.1810 (Core) server and VestaCP 0.9.8-23. Today I modified the nginx file configuration of a website in VestaCP and restarted the server. After