Email servers are now a must-have for small, medium, and large enterprises. They enable easy and efficient traffic control. Besides, having your email servers ensure that you can independently define or set your rules to meet your objectives. These advantages ensure that you manage your servers more efficiently and in a cleaner manner.
SMTP is your ideal protocol for email server management. Commonly known as Simple Mail Transfer Protocol, SMTP stands out as a standard internet communication protocol designed and used for electronic mail transmission. It routes emails by using third-party service providers to send emails through servers. This protocol comes in handy for companies or enterprises with large volumes of emails. Notably, SMTP has no downtimes, sends emails to your inbox rather than your spam folder, and has an analytics section on the dashboard. Thus, you do not need a lot of time and resources to manage your email servers.

https://green.cloud/docs/how-t....o-configure-smtp-ser

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When it comes to large organizations, Users and Groups in Linux play an important role in helping keep systems secure and properly functioning.

There can be different levels of users in an organization with different roles and permissions. And you’ll need a good understanding of Linux permissions to manage and/or understand them.

To protect files and directories in Linux from access by certain types of users, we can use the chown and chgrp commands. These commands let you manage which type of user can read, write, and execute a file.

https://green.cloud/docs/how-t....o-use-the-chown-and-

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Cacti is an open-source web-based network monitoring and system monitoring graphing tool. It is a frontend to RRDTool – a Time Series Database (TSDB).
Using Cacti you can monitor servers and network devices such as servers, routers, and switches. It gathers and monitors network traffic using the SNMP protocol. It can monitor various system metrics such as CPU, memory disk space, and bandwidth utilization. You can also set up alerts to receive email notifications during a system outage. Furthermore, it enables a faster response time when a problem arises.
You can use the LAMP stack to install Cacti on Linux Distribution. It also supports Nginx and IIS Webserver. The data collected is then stored in a MySQL or MariaDB database. The Data Collection framework is fully distributed, fault-tolerant, and scalable.

https://green.cloud/docs/how-t....o-install-and-config

#linux #cacti #apache #mariadb #ubuntu #ubuntu20 #ubuntu22
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If you’ve never changed your DNS address, you’re probably still using the one given to you by your ISP. It’s effortless to change the DNS server; by doing so, you can enhance your device's privacy and security (and speed, to some extent). A DNS is a string of numbers that you’ll need to enter into your device so it can connect to the internet. For example, Google's DNS address is 8.8.8.8 and 8.8.4.4. It’s very popular and is easy to remember. Changing your DNS settings is a simple process. However, before you change it, save the current DNS settings so you can easily switch back to the old numbers if something doesn't work. There are several public DNS servers that you can use such as Google Public DNS, Cloudflare, OpenDNS, OpenNIC, Comodo Secure DNS,...

#dns #dnsserver #windows #linux #macos
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If it’s just working with files, then there’s not much to say. Currently, many graphic tools effectively support this. Simply with a few mouse clicks, drag, drag, select, and drop and then everything is done. But that’s when manipulating the graphical interface, all of which are intuitive and vivid, and everything is easy to see. With a Linux environment, especially with a server environment, usually, we will not have such a graphical interface. Most server systems must operate through the command line window, black screen, and white text. At that time, mouse operations were too expensive. We only have a screen, and a keyboard, working directly with the command line. For those who do not often work on the command line system, this is a nightmare, the commands are too hard to remember and too difficult to use.

https://green.cloud/docs/how-t....o-manipulate-files-u

#linux #linuxvps #command #commandline #manipulate
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iftop is a network analyzing tool used by system administrators to view bandwidth-related stats. It shows a quick overview of the networking activities on an interface. It stands for Interface TOP and the top is derived from the op command in Linux. It even acts as a diagnostic to diagnose which program is causing the problem to the network.

https://green.cloud/docs/iftop....-a-real-time-linux-n

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Adding and removing users on a Linux system is one of the most important system administration tasks to familiarize yourself with. When you create a new system, you are often only given access to the root account by default.

While running as the root user gives you complete control over a system and its users, it is also dangerous and possibly destructive. For common system administration tasks, it’s a better idea to add an unprivileged user and carry out those tasks without root privileges. You can also create additional unprivileged accounts for any other users you may have on your system. Each user on a system should have their own separate account.

https://green.cloud/docs/how-t....o-add-remove-a-user-

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If you are a regular Linux user or a system administrator, you may require network setup on your system. Unlike desktop systems where you can use dynamic configurations, you will have to perform specific configurations on the servers depending on your network environment.

Dynamic configurations are constantly changing when the server is restarted, so in some cases, a static configuration is required, such as when the server needs to be administered remotely or when the server is running an application or service that requires constant access. So, in this video, we will explain how you can set up basic networking in a Ubuntu-based Linux operating system. The basic setup includes setting static IP, Gateway, DNS, and hostname.

https://green.cloud/docs/how-t....o-configure-the-netw

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Rescue mode or LiveOS is a Linux environment equipped with tools to support accessing your data. You will have access to all your disks and will be able to resolve the issue or back up data before performing a reinstallation.

https://green.cloud/docs/how-t....o-use-the-rescue-mod

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Enabling an SSH server on a virtual private server (VPS) will expose the server to the Internet and provide opportunities for hacking activities, especially when VPS still using root as primary access.

VPS should be configured with an email alert automatically to each successful login attempt via the SSH server. VPS server owner shall be notified of any SSH server access log, such as who, when, and which source IP address. This is an important security concern for server owners to protect the server from unknown login attempts. This is because if hackers use brute force to log into your VPS via ssh then it can be very dangerous.

https://green.cloud/docs/how-t....o-get-email-alerts-f

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From Ubuntu 17.10 onwards, the way a network is configured is completely changed. In earlier versions of Ubuntu, a static file (/etc/network/interfaces) was used for configuring network interfaces. Canonical has launched a new tool called Netplan to manage network settings. Netplan is a utility that uses YAML to configure networking on a Linux system.

https://green.cloud/docs/how-t....o-configure-static-i

#linux #staticip #ipaddress #netplan #ubuntu #ubuntu20 #ubuntu22
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