This category contains all the Linux, Solaris and ELK based topics.
In this article, I will take you through 15 Popular pssh command examples in Linux to perform parallel ssh in a single command. PSSH is a very popular command line tool used for parallel SSH Connections in Linux. You can connect multiple servers with different Linux/Unix OS to perform parallel SSH Operations. In many occasions ... Read more
In this article, I will take you through the steps to install and setup Freeradius Server in Linux (RHEL/CentOS 7/8). The FreeRadius server project is the implementation of the Remote Authentication Dial-In User Service (RADIUS) protocol used by many corporations and Internet service providers to authenticate users connecting from remote locations. The FreeRadius server daemon, ... Read more
In this article, I will take you through the steps to delete Elasticsearch Unassigned Shards. Elasticsearch stores data in the form of documents, which are grouped into an index. In the case of a huge amount of data, the number of documents in a single index may cross the limit of the underlying hardware capacity. ... Read more
In this article, I will show you how to delete all Elasticsearch Red Status Indices in 3 Easy Steps. Many times it so happens that your Elasticsearch will go down due to some reasons or it might not start properly if you perform reboot operation. In those cases you will see your cluster status as ... Read more
In this example, I will take you through the steps to resize qcow2 image with virt-resize using 6 Easy Steps. If you are running multiple virtual machines using qcow2 image and let's suppose one day you might feel you need some extra storage in your virtual machine then you need to go for resizing. This ... Read more
In this article, I will take you through the steps to install kvm server tools(virsh) on Linux (RedHat/CentOS 7/8) in 6 Easy Steps. Many of you might be familiar with Virtualization concepts where one can create mutliple virtual machines on a host machine by converting host machine into Hypervisor. You can use certain KVM tools ... Read more
In this article, I will take you through 15 Useful examples of iperf commands in Linux. iperf is an open source tool that can be easily installed in Linux. It provides a reliable information about Network Bandwidth and its performance. You can easily check the network latency and other errors using this tool. You can ... Read more
In this article I will take you through 18 Useful virsh commands examples for KVM Hypervisor Management. virsh is a free tool available to manage multiple domains deployed with Linux/Other OS in a bare metal with basic hardware resources like cpu, memory etc. It can also be used in ESXi, Virtualbox, QEMU etc to deploy ... Read more
In this article, we will go through 20 Useful Linux/Unix ssh-keygen command examples. ssh-keygen command is one of the most used Open source command in Linux Based Systems to generate Public/Private Key pair which can be used for authentication, passwordless login and in many more use cases. You will see this tool available by default ... Read more
In this article, I am show you how to resolve "host key verification Failed" error in Linux. I am sure many of you uses ssh protocol to access remote host in Linux. Many of you also have observed this "host key verification failed" error while trying to connect remote server through ssh based commands. This ... Read more