Ensuring keepalived starts after the network is ready
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After a recent OpenStack-Ansible (OSA) deployment on CentOS, I found that keepalived was not starting properly at boot time:
Network
2017
Fixing OpenStack noVNC consoles that ignore keyboard input
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I opened up a noVNC console to a virtual machine today in my OpenStack cloud but found that the console wouldn’t take keyboard input.
2016
Talk Recap: Holistic Security for OpenStack Clouds
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Thanks to everyone who attended my talk at the OpenStack Summit in Barcelona!
OpenStack instances come online with multiple network ports attached
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I ran into an interesting problem recently in my production OpenStack deployment that runs the Mitaka release.
Troubleshooting OpenStack network connectivity
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NOTE: This post is a work in progress.
2015
Customizing systemd’s network device names
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Earlier today, I wrote a post about my first thoughts on the Supermicro 5028D-T4NT server.
Restoring wireless and Bluetooth state after reboot in Fedora 22
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My upgrade to Fedora 22 on the ThinkPad X1 Carbon was fairly uneventful and the hiccups were minor.
Share a wireless connection via ethernet in GNOME 3.14
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There are some situations where you want to do the opposite of creating a wireless hotspot and you want to share a wireless connection to an ethernet connection. For example, if you’re at a hotel that offers only WiFi internet access, you could share that connection to an ethernet switch and plug in more devices. Also, you could get online with your wireless connection and create a small NAT network to test a network device without mangling your home network.
Creating a bridge for virtual machines using systemd-networkd
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There are plenty of guides out there for making ethernet bridges in Linux to support virtual machines using built-in network scripts or NetworkManager.
2014
Trust an IP address with firewalld’s rich rules
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Managing firewall rules with iptables can be tricky at times.
HOWTO: Time Warner Cable and IPv6
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httpry 0.1.8 available for RHEL and CentOS 7
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Red Hat Enterprise Linux and CentOS 7 users can now install httpry 0.
Unexpected predictable network naming with systemd
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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.
Adventures in live booting Linux distributions
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We’re all familiar with live booting Linux distributions.
Configure static IP addresses for Project Atomic’s KVM image
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Amid all of the Docker buzz at the Red Hat Summit, Project Atomic was launched.
2013
Speed up your Fedora PXE installations by hosting the stage2 installer locally
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In my previous post about installing Fedora via PXE, I forgot to mention a big time saver for the installation.
PXE boot Fedora 19 using a Mikrotik firewall
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Outside of the RHCA exams, I haven’t configured a PXE system for my personal needs.
Changing your ssh server’s port from the default: Is it worth it?
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Changing my ssh port from the default port (22) has been one of my standard processes for quite some time when I build new servers or virtual machines.
2012
Lesser-known but extremely handy Linux tools
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Kristóf Kovács has a fantastic post about some lesser-known Linux tools that can really come in handy in different situations.
Kerberos for haters
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I’ll be the first one to admit that Kerberos drives me a little insane.
Native IPv6 connectivity in Mikrotik’s RouterOS
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It’s no secret that I’m a big fan of the Routerboard devices and the RouterOS software from Mikrotik that runs on them.
2011
Getting online with a CradlePoint PHS-300 and an AT&T USBConnect Mercury
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Anyone who has used a 3G ExpressCard or USB stick knows how handy they can be when you need internet access away from home (and away from Wi-Fi).
2010
Keep web servers in sync with DRBD and OCFS2
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The guide to redundant cloud hosting that I wrote recently will need some adjustments as I’ve fallen hard for the performance and reliability of DRBD and OCFS2.
Securing your ssh server
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One of the most common questions that I see in my favorite IRC channel is: “How can I secure sshd on my server?
One month with GlusterFS in production
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As many of you might have noticed from my previous GlusterFS blog post and my various tweets, I’ve been working with GlusterFS in production for my personal hosting needs for just over a month.
Adding comments to iptables rules
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After I wrote a recent post on best practices for iptables, I noticed that I forgot to mention comments for iptables rules.
Testing network throughput with iperf
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When you need to measure network throughput and capacity, I haven’t found a simpler solution than iperf.
Private network interfaces: the forgotten security hole
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Regardless of the type of hosting you’re using - dedicated or cloud - it’s important to take network interface security seriously.