I’ve installed Xen dozens of times on CentOS 6, it’s a pretty straight forward process. You can follow the Xen Quickstart documentation. It goes something like this… Running the following commands: yum -y install centos-release-xen yum -y update yum -y install xen Well I tried that on a CentOS 7 Read more…
Okay this isn’t the normal CentOS questions, but I figured it’s appropriate. If you’re a system administrator like me, you’ll need up need to work on a switch or two. I’ve got a number of Juniper EX4200 and EX4400 switches that we use with BGP. I’ve been using Cisco devices Read more…
When booting on a default installation of CentOS 7, after the grub boot loading menu displays the screen refreshes into a progress bar during the boot process. I’m used to seeing the detailed kernel output during the boot process to diagnose boot problems. So these are the steps to disable Read more…
WordPress websites are very common and so are people trying to hack them. The XML-RPC attack where a hacker is constantly doing POST requests to xmlrpc.php is a common problem. Every time I see this happening to a client, their server load shoots up to 50 or even 100 which Read more…
We have a client with a multi-data center installation of Cassandra. While, I was in another one of our data centers working on a client cluster and attempting to run a rebuild and got a stream error. Cassandra server is running package cassandra30-3.0.9-1.noarch I ran the following command; nodetool -u Read more…
I just had a client recently ask, “Why doesn’t my secondary dns server update a zone?” They’re running pdns and poweradmin packages: poweradmin-2.1.4-1.el6.noarch pdns-4.0.3-1pdns.el6.x86_64 pdns-backend-mysql-4.0.3-1pdns.el6.x86_64 on both ns1 and ns2 servers. The ns2 server is set to be slave of ns1, so any changes made on ns1 automatically get populated Read more…