Saturday, 30 November 2019

How to Mount an NFS Share on CentOS 8 Client



NFS (Network File System) is a distributed network file sharing system protocol. It is provides to share files and folders between Linux distributions over the network. Nfs-utils package needed to mount NFS share on clients as local file system.

How to Mount Windows Share on CentOS 7 using CIFS



CIFS (Common Internet File System) is an implementation of SMB and network file sharing protocol. It is used to provide shared access to files, folders and printers etc. between windows to windows and windows to Linux machines over the network.

How to Install MySQL Community Server 8 on CentOS 8



MySQL Community Server is a free and open source version of MySQL Database management System. It is widely used for database management in LAMP stack like servers and used in web applications to store and retrieve data from database.

How to Stop and Disable Firewall on CentOS 8




Firewall is a free and open source tool that provides security features to control inbound and outbound traffic. It is enabled by default in CentOS 8 Linux machines, Services and ports can be allow and block by configuring firewall service.

How to Mount/Access ISO File Contents on CentOS 7




ISO (International Organization for Standardization) format is an archive file format which mostly used to contains the complete image of an installation software’s CD or DVD, backups etc.

How to Configure iSCSI Initiator Node on CentOS 7



iSCSI (Internet Small Computer Systems Interface) is an Internet Protocol based storage networking for connecting remote storage devices over the network. It provides block-level access to storage devices. iSCSI is used to facilitate block-level data data transfer between iSCSI initiator on a client machine and target on a storage server over local area networks (LANs), wide area networks (WANs).

How to Mount an NFS Share on CentOS 7 Client



NFS (Network File System) is a distributed network file sharing system protocol. It is provides to share files and folders between Linux distributions over the network. Nfs-utils package needed to mount NFS share on clients as local file system.

Thursday, 28 November 2019

How to Install MySQL Community Server 8 on CentOS 7



MySQL Community Server is a free and open source version of MySQL Database management System. It is widely used for database management in LAMP stack like servers and used in web applications to store and retrieve data from database.

How to Configure Software RAID 5 (Distributed Parity) on CentOS 7




RAID (Redundant Array of Independent \Inexpensive Disk) is a data storage technology that combines multiple physical disk drives into a single logical volume to provide data redundancy and performance which vary depending on the RAID levels. mdadm (multiple devices admin) is a widely used tool to manage RAID on most of the Linux distributions.

How to Configure Software RAID 1 (Mirroring) on CentOS 7



RAID (Redundant Array of Independent \Inexpensive Disk) is a data storage technology that combines multiple physical disk drives into a single logical volume to provide data redundancy and performance which vary depending on the RAID levels. mdadm (multiple devices admin) is a widely used tool to manage RAID on most of the Linux distributions.

How to Configure Software RAID 0 (Striping) on CentOS 7



RAID (Redundant Array of Independent \Inexpensive Disk) is a data storage technology that combines multiple physical disk drives into a single logical volume to provide data redundancy and performance which vary depending on the RAID levels. mdadm (multiple devices admin) is a widely used tool to manage RAID on most of the Linux distributions.

Tuesday, 26 November 2019

How to pull and run Docker images in CentOS 7




Docker containers are built from Docker images which can be downloaded from Docker Hub. Docker Hub is a cloud-based registry contains Docker images either in a public or private repository.

How to Install and Configure Docker on CentOS 7



Docker is a free, open source and community tool that’s manage application processes in containers. It is a lightweight, portable, self-sufficient container and ability to automate deployment. Docker community version can be installed from its official repository.

Monday, 25 November 2019

How to Install Open Stack Client on CentOS 8 (pip Installation)




OpenStack Client is a free and open source command-line tool, which allow to manage OpenStack components i.e. Compute, Identity, Image, Object Storage and Block Storage APIs together over the network.

How to Install python2 and pip2 on CentOS 8




Python is a programming and scripting language, widely used in Linux distributions. Python deprecated in CentOS 8. Pip a package management tool and widely used for development tools installation. It can be installed using dnf install python<version> and python<versions>-pip.

How to Install OpenStack Client on CentOS 7 (pip Installation)




OpenStack Client is a free and open source command-line tool, which allow to manage OpenStack components i.e. Compute, Identity, Image, Object Storage and Block Storage APIs together over the network.

Sunday, 24 November 2019

How to Install and Configure Nginx Server on CentOS 8




Nginx is a free and open source high-performance web server. It is also used for reverse proxy, load balancer and content cache servers. Now its binary is available in CentOS 8 AppStream Repository.

How to resolve “-bash: route: command not found” on CentOS 8



By default route command is not available in CentOS8 minimal installation and other Linux distributions. route command is available by installing package net-tools. ip route show command can be used instead of route command to check listening ports and services on CentOS8 minimal installation.

How to resolve “-bash: netstat: command not found” on CentOS 8



By default netstat command is not available in CentOS8 minimal installation and other Linux distributions. netstat command is available by installing package net-tools. ss command can be used instead of netstat command to check listening ports and services on CentOS8 minimal installation.

How to Configure Chrony Time Synchronization Server on CentOS 8




Chrony is a Time Synchronization server introduced in CentOS7. It is a free and open source widely used software for time synchronization between centralized Time Server and clients over the network. Chrony rpm package and its dependencies are available in CentOS8 base repository.

How to resolve “-bash: ifconfig: command not found” on CentOS 8



By default ifconfig command is not available in CentOS8 minimal installation and other Linux distributions. ifconfig command is available by installing package net-tools. ip a command can be used instead of ifconfig command on CentOS8 minimal installation.

How to Rename Network Interface Name on CentOS 8



In CentOS 7 and CentOS 8, a new NIC naming scheme is the predictable naming rule is adopted by default like ens192, enp3s0, eth0 and so on. To disable the predictable naming rule pass "net.ifnames=0" and biosdevname=0” kernel parameter during boot.

Saturday, 23 November 2019

How to Disable Network Manager on CentOS 8




The Network Manager Service is enabled by default on CentOS 8 and all the network services are managed by Network Manager. Network Manager is not suitable for advanced networking setup, such as configuring Network Bridge, aliases and interface name conversions etc. Alternatively, add "NM_CONTROLLED=no" directive in the network configuration files instead of disabling Network Manager.

Friday, 22 November 2019

How to Configure Password Less Authentication on CentOS 7



In some certain reason, password less authentication is require on remote machine which helps to access the remote machine without entering the password for login, deployment and management purpose.

How to Install GFS2 (Global File System 2) Packages on CentOS 7




GFS2 (Global File System 2) is a shared disk file system and interfacing directly with the kernel VFS (Virtual File System) layer. GFS2 file system allows concurrent access to local and multiple cluster nodes.

How to Resolve "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" Error on CentOS 7



In most of cloud images, password authentication login method is disabled in Open SSH Configuration and can be logged in using SSH private key only. Following error messages will appear while coping ssh on remote server and also will get error when login on the server using password.

How to Resolve “No package iperf available.” on CentOS 7




Mostly the massage “No package iperf available” will appears when the package is not available in CentOS 7 Base/default repositories and the massages will display like below:

How to Install and Configure Ceph Storage on CentOS 7



Ceph Storage is a free and open source widely used software defined storage solution which provides file system storage, object storage and block level centralize storage.

Sunday, 17 November 2019

How to Configure iSCSI Target with Two LUNs on CentOS 7 (Using HDD Partitions)



iSCSI (Internet Small Computer Systems Interface) is an Internet Protocol based storage networking for connecting remote storage devices over the network. It provides block-level access to storage devices. iSCSI is used to facilitate block-level data transfer between iSCSI initiator on a client machine and target on a storage server over local area networks (LANs), wide area networks (WANs).

Saturday, 16 November 2019

How to Configure iSCSI Target and Initiator on CentOS 8



iSCSI (Internet Small Computer Systems Interface) is an Internet Protocol based storage networking for connecting remote storage devices over the network. It provides block-level access to storage devices. iSCSI is used to facilitate block-level data transfer between iSCSI initiator on a client machine and target on a storage server over local area networks (LANs), wide area networks (WANs).

Sunday, 10 November 2019

How to Install XRDP Remote Desktop Server on CentOS 8



XRDP is an Open Source Remote Desktop Protocol Server, which is allowing users to take remote desktop of Linux Operating System from RDP clients. XRDP uses RSA Public Key and Private Key encryption to transfer data over the network.

How to Install Gnome GUI on CentOS 8 Using YUM Group Install



CentOS 8 and many Linux distributions have options to install minimal, GUI and others and minimal installation restrict resource utilization. However if minimal installation done while installation and GUI can be installed later.

How to Increase Swap Memory in Centos 7 (Using HDD Partition)




Linux distributions has the facility to reserve some amount of disk space to use as virtual memory when the amount of physical memory (RAM) is full. Swapping is a method when the RAM is fully utilized, inactive pages in the memory are moved to the swap space from the RAM to swap space.

Saturday, 9 November 2019

How to Install Ccrypt on CentOS 8 Using RPM Package



Ccrypt is a command line utility for encryption and decryption of files and streams in Linux [CentOS 8]. The Ccrypt utility is not available in CentOS 8 base repository.

How to Install Postfix Mail Server on CentOS 8 Minimal




Postfix is a free and open source widely used mail server for Linux distributions. It is available in base repository on most of the latest Linux distributions.

How to Install Nagios Core Server on CentOS 7



Nagios Core is free and open source widely used monitoring tool which can be used for monitoring Linux servers, Windows servers, Network devices and other applications. Nagios provides alerting services (SMS, Email etc.) for abnormal utilization and issues for Attributes CPU load, Memory usage, Disk usage, Logged in users, Running processes etc. and Services HTTP, FTP, SSH, SMTP, POP3, SNMP etc.

How to Increase Swap Memory in CentOS 7 (Using Swap File)



Linux distributions has the facility to reserve some amount of disk space to use as virtual memory when the amount of physical memory (RAM) is full. Swapping is a method when the RAM is fully utilized, inactive pages in the memory are moved to the swap space from the RAM to swap space.

Friday, 1 November 2019

How to Changing/Reset the root password on the CentOS 7 qcow2 Image (virt-customize)



"virt-customize" provide a feature to customize a file system and its configuration data of a qcow2 format images.

How to Configure NFS File Sharing Server on CentOS 7




NFS (Network File System) is a distributed network file sharing system protocol. It is provides to share files and folders between Linux distributions over the network.

How to Set root Password of CentOS 7 Cloud Image (guestfish)




Most of the cloud images protect by disabling root password and Disabling Remote Root and Other users login using their passwords. By default "guestfish" is an interactive shell that provides directory access the guest virtual machine file system access.