In this case im using a ssd drive named /dev/sdb with filesystem formatted to ext4, it is know that ssd has a limited writes cycles eventually wears off overtime compared to normal HDD but ssd has a greater speed advantage compared to hdd drives. Checking ssd current state with smartctl. ssd is dected as sdb… Read More »
Zswap is a kernel feature which provides a compressed RAM cache for swap pages, it works in conjuction with swap space. If swap partition is not present then we can create a swapfile and activate it. Making a filebased swap, Create a 2GB swap partition with “dd” and activate it. [root@localhost cipher]# dd if=/dev/zero of=/mnt/swapfile… Read More »
Red hat certifications are one of the most demanding in the in the IT industry , i wanted to get started with planning working towards getting RHCE certified ,while preparing for rhce certification one of the recommended book is Red Hat RHCSA/RHCE 7 Cert Guide: Red Hat Enterprise Linux 7 (EX200 and EX300) which covers… Read More »
Generally when a network is configured from virsh-define for a particular range say 192.168.4.0 it gateway will be automatically assigned to 192.168.4.1, if the gateway wants to be changed to 192.168.4.2 then it can be done by using virsh-net edit command line option from cli. <route family=’ipv4′ address=’192.168.4.0′ prefix=’24’ gateway=’192.168.4.2’/> Check the existing virsh networks… Read More »
Recently while playing around disk partitions on fedora 28 i have observed that boot times were painfully slow on my laptop, when investigated found the issue was due to an enty for non existant swap partition in fstab. to fix the issue i recreated a swap file system and added below lines to fstab #… Read More »
Foreman is a provisioning and complete life cycle management orchestration tool for managing infratructure from a graphical interface and also from command line tool hammer-cli. With computing resources in foreman supports managing different type of hosts like vmware, aws , baremetal , kvm , docker etc.. to name a few Under the hood foreman uses… Read More »
Abstract Personal virtual desktops are virtual machines that are assigned to a user within your organization and available by using either RemoteApp and Desktop Connection or Remote Desktop Web Access (RD Web Access). In this guide, we will set up a personal virtual desktop and connect to it by using RD Web Access. Scenario:… Read More »
Clonezilla used to restore the clone image to a destiantion drive , if the destination drive size is larger than the original source disk cloned then after image restore you will see old disk size instead of new one. Eg: A clone was done on 250gb hdd and restored to a 1Tb drive , after… Read More »
After setting up bridge network on network interface enp9s0 , kvm guests had issues with accessing ssh,internet. Current bridge configuration bridge name bridge id STP enabled interfaces br0 8000.001c2301fbdc no enp9s0 to allow kvm guests network connectivity with host net.ipv4.ip_forward should be enabled, add net.ipv4.ip_forward = 1 to /etc/sysctl.conf kernel.sysrq = 1 vm.swappiness=10 vm.vfs_cache_pressure=50 net.ipv4.ip_forward… Read More »
Openvswith is a virtual switch production level software, that can be used in virtual switch in VM environments like kvm , virtualbox etc.. In case of vm’s network connection to outer world is established by NAT or Bridge (Layer2 device) , this model is good for single server vm guests , openvswitch is suited for… Read More »