linux lvm disk management commands
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LVM Management in CentOS/Red Hat 7 Linux
LVM (Logical Volume Manager) is the recommended partition method for CentOS/Red Hat 7 Linux. Specially, if we work on Mail Server, File Server, FTP Server, Web Proxy Server or any application where disk space changes frequently, the LVM partition is mandatory in this case. In my previous article, I discussed how to install CentOS 7.5 with LVM partitioning. If you are new here or CentOS 7 is not yet installed, I will suggest you to follow my previous article and install CentOS 7 with LVM partitioning and then continue this article. In this article, I will discuss how to manage LVM partitioning in CentOS/ Red Hat 7 Linux with the command line utility. Basic Components and Architecture of LVM Before going to start LVM management with command line tool, we should have basic knowledge on the basic LVM terms and architecture. The following three terms are the basic components of the LVM partitioning. Physical Volume: The underlying physical storage unit of an LVM is a block device such as a partition of a disk or the whole disk. To use the block device for an LVM logical volume, the device must be initialized as a physical volume (PV). Volume Groups: [...]
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CentOS 7 Partition Management with fdisk Utility | February 11, 2019
CentOS or Red Hat Linux is a popular server operating system to the system administrators. Almost all the system admins or IT guys who play with mail server, file server, proxy server and so on are so known with CentOS or Red Hat Linux and cannot go a single day without this operating system. The guys who are also wish to be a system admin should be familiar with CentOS or Red Hat operating system. In my previous article, I [...]
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Mikrotik Router Basic Configuration Using Winbox | August 24, 2015
MikroTik is one of the most popular routers. MikroTik Router has a lot of networking services that help to build a stable and smooth network so easily. It is said that any ISP Company or any Enterprise Office cannot go a single day without MikroTik Router. So, system administrators who are not using MikroTik Router yet, they will soon start using MikroTik Router, I think. As a system administrator, I am also using MikroTik Router about 5 years in my network [...]
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Internet Connection Sharing Ethernet to Ethernet | September 22, 2015
Windows is the most popular operating system to any computer user. It is said that no computer user cannot go a single a day without windows operating system. Windows has a lot of default internet features which help to connect our computer to internet as well as it provides internet connection sharing facility. With Internet Connection Sharing (ICS) feature, you can turn your laptop into Wi-Fi hotspot or turn your desktop into a router to share your broadband connection with your family [...]
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How to Block MAC Address in MikroTik RouterOS 7 | July 11, 2024
MikroTik RouterOS 7 by default allows any MAC address to get internet connection through it. But we may need to block some MAC addresses sometimes. There are three methods to block MAC address in MikroTik RouterOS 7 – Blocking MAC Address using Bridge Filter Rule. Blocking MAC Address using Firewall Filter Rule and Blocking MAC Address from DHCP Lease. We can use any of these methods if we want to block MAC Address in MikroTik Router. In this article, we [...]
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MikroTik Router Auto Backup via Email | August 23, 2016
MikroTik Router is popularly used not only in ISP network but also in enterprise office network. So, MikroTik is a popular item to network administrator. A regular task of a network administrator is to keep and store router configuration file backup. Almost every network administrator takes configuration file backup manually. But MikroTik Router has an E-mail tool by which network administrators can automate configuration file backup regularly via email and can reduce his daily manual task easily. E-mail tool is [...]
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MikroTik Hotspot Setup with Radius Server (User Manager) | January 6, 2018
Hotspot is one of the most popular services in MikroTik Router. It is popularly used in Hotel and Restaurant, Railway Station or Airport, School or University Campus and so on. Even ISP network and office network also use MikroTik Hotspot for authenticating network clients/users. Hotspot user can be managed with Hotspot’s local user database or with a Radius Server. Radius Server gives facility to manage Hotspot user’s bandwidth and accounting easily and centrally. So, Hotspot setup with Radius Server can [...]
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Firewalld Installation and Configuration in Ubuntu Server | May 5, 2022
Firewalld is an awesome host based firewall management tool for Linux Operating System. Firewalld has developed on Fedora but it is now available for almost all Linux distributions. So, Firewalld can be installed in Ubuntu Server although Ubuntu Server has UFW as the default firewall system. Firewalld is more robust and easy to maintain than UFW, I think. So, I am going to discuss how to install and configure Firewalld in Ubuntu Server. Installing Firewalld in Ubuntu Server By default [...]
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How to Block VPN Access with MikroTik Router | May 14, 2019
Sometimes system administrators create firewall rule to block unwanted websites. But VPN apps break these firewall rules and allow access to unwanted websites. For example, if Facebook is blocked with MikroTik Firewall and any expert user installs and enables VPN apps (such as OpenVPN, Hotspot Shield, ProtonVPN, NordVPN, PureVPN etc.), he can easily get access to Facebook. So, system administrators should also block popular VPN apps so that user cannot use those VPN servers. Blocking VPN apps is not so [...]
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MikroTik Load Balancing over Multiple Gateways (2 WAN) | October 13, 2016
Load Balancing is a technique used to send network traffic over multiple gateways. If you have multiple ISP connections in your network, you can send your network traffic through those ISP connections and can make a load balancing network. Accidently you may ask me, why will I use multiple ISP connections? What are the benefits to use multiple ISP connections in my network? I will say, ask yourself deeply then you will find the reasons why multiple ISP connections is [...]
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