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Centos

2022


Build a Tailscale exit node with firewalld

··788 words·4 mins
Tailscale exit nodes allow you to route your traffic through nearly any system in your tailnet. Learn how to build an exit node using firewalld. 🕳️

2019


2018


Install testing kernels in Fedora

··465 words·3 mins
If you’re on the latest Fedora release, you’re already running lots of modern packages.

2017


RHEL 7 STIG v1 updates for openstack-ansible-security

··204 words·1 min
DISA’s final release of the Red Hat Enterprise Linux (RHEL) 7 Security Technical Implementation Guide (STIG) came out a few weeks ago and it has plenty of improvements and changes.

2016


2015


Understanding systemd’s predictable network device names

··1310 words·7 mins
I talked a bit about systemd’s network device name in my earlier post about systemd-networkd and bonding and I received some questions about how systemd rolls through the possible names of network devices to choose the final name.

Improving LXC template security

··312 words·2 mins
I’ve been getting involved with the Fedora Security Team lately and we’re working as a group to crush security bugs that affect Fedora, CentOS (via EPEL) and Red Hat Enterprise Linux (via EPEL).

Keep old kernels with yum and dnf

··206 words·1 min
When you upgrade packages on Red Hat, CentOS and Fedora systems, the newer package replaces the older package.

2014


Install sysstat on Fedora 21

··366 words·2 mins
One of the first tools I learned about after working with Red Hat was sysstat.

Unexpected predictable network naming with systemd

··472 words·3 mins
While using a Dell R720 at work today, we stumbled upon a problem where the predictable network device naming with systemd gave us some unpredictable results.

2013


Limit access to the su command

··177 words·1 min
The wheel group exists for a critical purpose and Wikipedia has a concise definition:

Seriously, stop disabling SELinux

··147 words·1 min
After many discussions with fellow Linux users, I’ve come to realize that most seem to disable SELinux rather than understand why it’s denying access.

Remove sensitive information from email headers with postfix

··172 words·1 min
I’m in the process of moving back to a postfix/dovecot setup for hosting my own mail and I wanted a way to remove the more sensitive email headers that are normally generated when I send mail.

2012


Log Android events remotely to a syslog server

··572 words·3 mins
I’m still quite pleased with my Samsung Galaxy SIII but there are some finicky Bluetooth issues with my car that I simply can’t figure out.

Automatic package updates in CentOS 6

··245 words·2 mins
Automating package updates in CentOS 6 is a quick process and it ensures that your system receives the latest available security patches, bugfixes and enhancements.

New Fedora and EPEL package: httpry

··229 words·2 mins
A fellow Racker showed me httpry about five years ago and I’ve had in my toolbox as a handy way to watch HTTP traffic.

The Kerberos-hater’s guide to installing Kerberos

··1619 words·8 mins
As promised in my earlier post entitled Kerberos for haters, I’ve assembled the simplest possible guide to get Kerberos up an running on two CentOS 5 servers.

Getting started with SELinux

··564 words·3 mins
I used to be one of those folks who would install Fedora, CentOS, Scientific Linux, or Red Hat and disable SELinux during the installation.

2011


Dual-primary DRBD with OCFS2

··979 words·5 mins
As promised in one of my previous posts about dual-primary DRBD and OCFS2, I’ve compiled a step-by-step guide for Fedora.

2010