Linux

top command on multi core processor

top command shows CPU usage as a percentage of a single CPU by default. That’s why you can have percentages that are >100. On a system with 4 physical or virtual cores, you can see up to 400% CPU usage. You can change this behavior by pressing I (that’s Shift + …

Read More »

Reasons to Stick with MySQL

mysql update

MySQL’s founder is encouraging people to steer away from his creation. Here’s why he’s wrong. Schism between the worlds of open source and proprietary software is never going to go away as long as open source remains viable and competitive. Eventually, you have a meeting of both worlds. In the …

Read More »

MySQL Update – MySQL Upgrade

mysql update

MySQL update process some times create issues like, MySQL server doesn’t start. when you perform MySQL update using yum update or yum update mysql or yum update mysql-server before restarting or stopping server  , you need to run command mysql_upgrade or mysql_upgrade -uroot -p MySQL Update Errors some time mysql …

Read More »

KVM Installation on CentOS 6

KVM and CentOS 6 CentOS 6 has native availability of KVM virtualization support and tools in the base distribution.  See the meta packages contained in: # yum grouplist | grep -i virt 1. Host Setup Install all the packages you might need. yum -y install @virt* dejavu-lgc-* xorg-x11-xauth tigervnc \ …

Read More »

NFS Server and client configuration Centos

NFS Server side configuration Create directory which you want to share mkdir -p /nfsshare yum install nfs-utils rpcbind nfs-utils-lib chkconfig rpcbind on chkconfig nfs on chkconfig nfslock on service rpcbind start service nfs start or /etc/init.d/nfs start service nfslock start define allowed IPs on server lets suppose Server IP : …

Read More »

How to setup network after RHEL/CentOS 7 minimal installation

After installing RHEL/CentOS 7 minimal, You may not able to connect network in that machine. This will happen because Ethernet interfaces are not enabled by default. This guide explain you to setup network on RHEL/CentOS 7. Setup network on CentOS 7 minimal First, type “nmcli d” command in your terminal …

Read More »

How to run your own email server with your own domain

E-mail is old and complex. It’s the oldest still-recognizable component of the Internet, with its modern incarnation having coalesced out of several different decades-old messaging technologies including ARPANET node-to-node messaging in the early 1970s. And though it remains a cornerstone of the Internet—the original killer app, really—it’s also extraordinarily hard …

Read More »