[root@RHEL7HARDEN ~]# rpm -qa yum yum-3.4.3-132.el7.centos.0.1.noarch [root@RHEL7HARDEN ~]#

I captured the list of ‘Warning: group <groupname> does not exitst.’ (see previous post) from a ‘yum update’ run which I CTRL+c out of once the warnings ended. I removed the ‘Warning: group ‘ from the front and the ‘ does not exitst.’ from the back […]

xmlrpc.php attack on WordPress – High CPU usage

Just noticed that incoming emails were being delayed by about 30 minutes, we host our emails on Google Apps, so that couldn’t have been the issue. Next step was to investigate the server where the DNS of our domain was being hosted. Turns out the server was […]

This error took me an hour to solve ERROR: Installation can not proceed. Please fix your /etc/hosts file You need to make sure the hostname is on the first line and should match the hostname of the server. All the documentation I see mentions something like mail.domain.com. This leads to confusion because usually your server […]

Kubernetes is an open source project that brings ‘Google style’ cluster management capabilities to the world of virtual machines, or ‘on the metal’ scenarios. It works very well with modern operating system environments (like CoreOS or Red Hat Atomic) that offer up lightweight computing ‘nodes’ that are managed for you. It is written in Golang […]

This is one of the best command that facilitates the system admin to perform his specific tasks. Below is the list with the examples showing the paste command.

[localhost@localhost ~]$ cat file1 apple orange mango banana

[localhost@localhost ~]$ cat file2 coldplay westlife michael sunibigyana piyush

[localhost@localhost ~]$ paste -s file1 apple orange mango banana

[localhost@localhost […]