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<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/"> <channel><title>Andreas Karis Blog</title><description>Andreas Karis' blog about anything Kubernetes, OpenShift, Linux and Networking</description><link>https://andreaskaris.github.io/blog/</link><atom:link href="https://andreaskaris.github.io/blog/feed_rss_updated.xml" rel="self" type="application/rss+xml" /><language>en</language> <pubDate>Tue, 21 Jan 2025 20:13:41 -0000</pubDate> <lastBuildDate>Tue, 21 Jan 2025 20:13:41 -0000</lastBuildDate> <ttl>1440</ttl> <generator>MkDocs RSS plugin - v1.17.1</generator> <image> <url>None</url> <title>Andreas Karis Blog</title><link>https://andreaskaris.github.io/blog/</link> </image> <item> <title>Resetting libvirt qcow attributes</title> <description><h1>Resetting libvirt qcow attributes</h1><p>I have run my instances from an external drive and occasionally it may so happen that I involuntarily disconnect the dri...</p></description><link>https://andreaskaris.github.io/blog/linux/resetting-libvirt-qcow-attributes/</link> <pubDate>Tue, 21 Jan 2025 21:13:38 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/resetting-libvirt-qcow-attributes/</guid> </item> <item> <title>Setting COS on outgoing packets in Linux</title> <description><h1>Setting COS on egress in Linux</h1><p>In order to set COS (<a href="https://en.wikipedia.org/wiki/IEEE_802.1Q">802.1Q</a> Priority Code Point) on outgoing frames, youfirst...</p></description><link>https://andreaskaris.github.io/blog/networking/setting-cos-on-egress/</link> <pubDate>Tue, 21 Jan 2025 12:47:51 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/networking/setting-cos-on-egress/</guid> </item> <item> <title>How RHCOS updates work</title> <description><h2>How RHCOS updates work</h2><ul><li>https://github.com/openshift/machine-config-operator/blob/1d4e8d0a4658fe9a9683bdf41c6444db10ee876a/docs/MachineConfigDaemon.md#o...</li></ul></description><link>https://andreaskaris.github.io/blog/openshift/how_rhcos_updates_work/</link> <pubDate>Thu, 14 Nov 2024 15:15:15 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/how_rhcos_updates_work/</guid> </item> <item> <title>Horizontal Pod Autoscaler</title> <description><h3>Understanding the Horizontal Pod Autoscaler (HPA)</h3><p>The basics for Horiontal Pod Autoscaler (HPA) are well explained in:</p><ul><li>[https://kubernetes.io/docs/ta...</li></ul></description><link>https://andreaskaris.github.io/blog/openshift/HPA/</link> <pubDate>Wed, 14 Aug 2024 13:18:24 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/HPA/</guid> </item> <item> <title>RSS, IRQ affinity and RPS on Linux</title> <description><h1>RSS, IRQ affinity and RPS on Linux</h1><p>In this blog post, we are going to have a look at the tuning of Linux receive queues and their interrupt requests. Wea...</p></description><link>https://andreaskaris.github.io/blog/networking/rss-irq-affinity-and-rps/</link> <pubDate>Mon, 12 Aug 2024 16:56:51 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/networking/rss-irq-affinity-and-rps/</guid> </item> <item> <title>SELinux Cheat Sheet</title> <description><h1>SELinux Cheat Sheet</h1><h3>Reading SELinux status</h3><p>| Command | Description | Examples ||---|---|---|| cat /etc/selinux/config | Get SELinux boot configu...</p></description><link>https://andreaskaris.github.io/blog/linux/selinux-cheatsheet/</link> <pubDate>Fri, 19 Jul 2024 17:46:48 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/selinux-cheatsheet/</guid> </item> <item> <title>Protect Lenovo laptop battery</title> <description><p>In order to protect your Lenovo battery, you can set charge start and end thresholds.According to [anecdotal evidence](https://linrunner.de/tlp/faq/battery....</p></description><link>https://andreaskaris.github.io/blog/linux/protect-lenovo-battery/</link> <pubDate>Thu, 20 Jun 2024 14:59:35 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/protect-lenovo-battery/</guid> </item> <item> <title>Netlink and MAC addresses</title> <description><h2>Netlink address fields IFLA_ADDRESS, IFLA_BROADCAST and IFLA_PERM_ADDRESS</h2><p>A few days ago, I had to figure out how applications such as iproute2 read the ...</p></description><link>https://andreaskaris.github.io/blog/networking/netlink-address-fields/</link> <pubDate>Mon, 13 May 2024 11:22:39 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/networking/netlink-address-fields/</guid> </item> <item> <title>CPU isolation in Red Hat OpenShift Container Platform</title> <description><h2>CPU isolation in Red Hat OpenShift Container Platform</h2><p>Two complementary features allow admins to partition the node's CPUs according to their needs. The ...</p></description><link>https://andreaskaris.github.io/blog/openshift/cpu-isolation-in-openshift/</link> <pubDate>Mon, 06 May 2024 22:24:07 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/cpu-isolation-in-openshift/</guid> </item> <item> <title>udev rules to apply ethtool settings</title> <description><h1>udev rules to apply ethtool settings</h1><p>In order to apply specific ethtool settings to all interfaces matching a specific regular expression, run:```cat &lt;&lt;...</p></description><link>https://andreaskaris.github.io/blog/linux/udev-ethtool/</link> <pubDate>Mon, 29 Apr 2024 19:44:04 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/udev-ethtool/</guid> </item> <item> <title>OpenShift with iSCSI multipath</title> <description><h2>Kubernets iSCSI volume driver</h2><p>The iSCSI volume driver can work as both a single path iSCSI initiator or with multipath.For some information about the dr...</p></description><link>https://andreaskaris.github.io/blog/openshift/openshift-with-multipath/</link> <pubDate>Fri, 12 Jan 2024 18:05:09 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/openshift-with-multipath/</guid> </item> <item> <title>kernel-ml on OpenShift</title> <description><h1>kernel-ml on OpenShift</h1><p>In order to find out if a kernel bug was already fixed upstream, it may sometimes be necessary to test the upstreamkernel on top o...</p></description><link>https://andreaskaris.github.io/blog/openshift/kernel-ml-on-openshift/</link> <pubDate>Thu, 23 Nov 2023 18:46:14 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/kernel-ml-on-openshift/</guid> </item> <item> <title>Setting journalctl limits</title> <description><h2>Changing the size of data that journald retains</h2><p>The systemd journal by default retains 4GB of data. In order to increase or decrease that value, set `Sys...</p></description><link>https://andreaskaris.github.io/blog/linux/setting-journalctl-limits/</link> <pubDate>Thu, 09 Nov 2023 17:19:41 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/setting-journalctl-limits/</guid> </item> <item> <title>Seccomp defaults in Red Hat OpenShift Container Platform</title> <description><h1>Seccomp defaults in Red Hat OpenShift Container Platform</h1><p>Seccomp can be used to restrict the syscalls that processes running inside a container are allowe...</p></description><link>https://andreaskaris.github.io/blog/openshift/seccomp-defaults-ocp/</link> <pubDate>Wed, 11 Oct 2023 18:48:34 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/seccomp-defaults-ocp/</guid> </item> <item> <title>Hands-on with OVN Interconnection</title> <description><h1>Hands-on with OVN Interconnection (OVN IC)</h1><p><a href="https://docs.ovn.org/en/latest/tutorials/ovn-interconnection.html">OVN Interconnection</a> (OVN IC) allows admini...</p></description><link>https://andreaskaris.github.io/blog/networking/ovn-interconnection/</link> <pubDate>Mon, 11 Sep 2023 19:16:51 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/networking/ovn-interconnection/</guid> </item> <item> <title>rpm-ostreed failed to find image</title> <description><h2>rpm-ostreed failed to find image</h2><p>Today, I ran into a strange issue after messing around a bit too much with OpenShift's Machine Config Operator.After de...</p></description><link>https://andreaskaris.github.io/blog/openshift/rpm-ostree-failed-to-find-image/</link> <pubDate>Tue, 15 Aug 2023 20:03:49 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/rpm-ostree-failed-to-find-image/</guid> </item> <item> <title>My vimrc</title> <description><h1>My vimrc</h1><p>Below my configuration for vim which I use for go and python development:~~~cat &lt;&lt;'EOF' &gt; ~/.vimrccall plug#begin() Plug 'vim-airline/vim-ai...</p></description><link>https://andreaskaris.github.io/blog/coding/vimrc/</link> <pubDate>Tue, 25 Jul 2023 13:34:48 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/coding/vimrc/</guid> </item> <item> <title>Workaround for org.gnome.shell.overrides not installed</title> <description><h1>Settings schema 'org.gnome.shell.overrides' is not installed</h1><p>I recently upgraded to Fedora 38 and Gnome 44, and one of my installed applications give this...</p></description><link>https://andreaskaris.github.io/blog/linux/org-gnome-shell-overrides/</link> <pubDate>Wed, 03 May 2023 19:38:38 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/org-gnome-shell-overrides/</guid> </item> <item> <title>DedicatedServiceMonitors in OpenShift Monitoring</title> <description><h2>DedicatedServiceMonitors in Red Hat OpenShift Monitoring</h2><h3>Introduction</h3><p>By default, OpenShift's Prometheus stack will pull pod CPU and memory usage fr...</p></description><link>https://andreaskaris.github.io/blog/openshift/dedicated-service-monitors/</link> <pubDate>Wed, 03 May 2023 16:41:21 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/openshift/dedicated-service-monitors/</guid> </item> <item> <title>Using cgroups for CFS bandwidth control</title> <description><h1>Using cgroups for CFS bandwidth control (CPU quotas)</h1><p>CFS bandwidth control is a feature that allows you to limit the amount of CPU time that a control gro...</p></description><link>https://andreaskaris.github.io/blog/linux/cgroups_cpu_quota/</link> <pubDate>Mon, 27 Mar 2023 11:42:03 +0000</pubDate><source url="https://andreaskaris.github.io/blog/feed_rss_updated.xml">Andreas Karis Blog</source><guid isPermaLink="true">https://andreaskaris.github.io/blog/linux/cgroups_cpu_quota/</guid> </item> </channel></rss>