As a Linux System Admin, we have come across such requirement multiple times for Vertical scaling of Linux VMs in VMware infrastructure. Vertical scaling means adding of additional resources like CPU, memory, Storage to server or VM for increasing its capacity to address more load of Application or DB hosted on Linux VM but what…
Tag: RHEL-CentOS
How to recover or rebuild initramfs in CentOS 7 Linux
Corruption of initramfs can be occur by many ways for example after patching CentOS 7 Linux OS or installing a buggy device driver in server you found CentOS 7 Linux server has become unbootable. You may also encouter below kernel panic error because server initramfs got damaged . CentOS 7 Linux Kernel Panic screen Now…
How to Set password policy in CentOS or RHEL system
Linux is known for one of most secure Unix Operating System (OS) in world. But that is not mean it is 100% secure there is say in Information Technology (IT) no technology is a completely secure that is why from a System Administrator to CIO they take measure for securing IT infrastructure on regular basis…
Red Hat Enterprise Linux 8 Beta major features and improvement
Red Hat has launched the beta version of Red Hat Enterprise Linux 8 (RHEL 8) for users and developers for testing purpose and getting feedback from them. Red Hat Inc. which is developing RHEL 8 has announced this operating system beta version for public use on November 14, 2018. Four year ago when Red Hat…
Segmentation Fault error in Linux / Unix system
You were running a program installed in your Linux/Unix system and suddenly that program get stop and it log error in its logs memory segmentation fault error or you might executing a command in Linux / Unix server say you are working on LVM extension or VG scanning but you are unable to do so…
Simple way to configure Ngnix High Availability Web Server with Pacemaker and Corosync on CentOS7
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…
How to recover “rpmdb open failed” error in RHEL or Centos Linux
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…