Pacemaker is an open source cluster manager software which provide high availability of resources or services in CentOS 7 or RHEL 7 Linux. It has feature of scalable and advanced HA Cluster Manager. This HA cluster manager distributed by ClusterLabs. Corosync is the core of Pacemaker Cluster Manager as it is responsible for generating heartbeat…
You are updating the system through yum command and suddenly power goes down or what happen if yum process is accidentally killed. Post this situation when you tried to update the system again with yum command now you are getting below error message related to rpmdb: error: rpmdb: BDB0113 Thread/process 2196/139984719730496 failed: BDB1507 Thread died…
OpenFlow is a standard protocol of SDN which assist SDN Controller to communicate directly with the forwarding plane of network devices such as switches and routers, both physical and virtual (hypervisor-based), so it can better adapt to changing business requirements. Generally the conventional switches forwards the packets which are called the Forwarding Plane and do…
In Ubuntu we can set different installed kernel version as default so that during next boot time Ubuntu can boot from that default kernel version as per requirement. There can be many reason for setting different installed kernel version as default example: Ubuntu is unable to boot with current installed or upgraded kernel version. After…
I Love Ubuntu after Fedora it is my preferred OS who live in my personal Laptop. Today I was trying to install Oracle Virtualbox in my Laptop during building initrd image I start getting boot partition full error on screen. Also in apt-get installation screen I got below error message due to no space…
