Below the Waterline — Nordkeel's notebook on Kubernetes, Ansible, Zabbix, and platform engineering.https://nordkeel.dk/https://nordkeel.dk/blog/posts/05-06-2026-testing-zabbix-maps-as-code/https://nordkeel.dk/blog/posts/05-06-2026-testing-zabbix-maps-as-code/Fri, 05 Jun 2026 00:00:00 GMThttps://nordkeel.dk/blog/posts/28-05-2026-creating-zabbix-network-maps-with-ansible/https://nordkeel.dk/blog/posts/28-05-2026-creating-zabbix-network-maps-with-ansible/Thu, 28 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/posts/28-05-2026-zabbix-maps-as-code-with-a-custom-ansible-module/https://nordkeel.dk/blog/posts/28-05-2026-zabbix-maps-as-code-with-a-custom-ansible-module/Thu, 28 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/21-05-2026-ansible-zabbix-automation/https://nordkeel.dk/blog/projects/21-05-2026-ansible-zabbix-automation/Two Ansible roles that pin the full Zabbix stack: database, server, proxies, and agents. Idempotent across RHEL and Ubuntu, with three non-obvious things the docs don't mention.Thu, 21 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/20-05-2026-unpacker-oci-artifact-tool/https://nordkeel.dk/blog/projects/20-05-2026-unpacker-oci-artifact-tool/OCI registries hold more than Docker images — Helm charts, Flux manifests, and custom artifacts live there too. unpacker is a Go tool that pulls and unpacks any of them with a single command.Wed, 20 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/20-05-2026-zabbix-k8s-stack/https://nordkeel.dk/blog/projects/20-05-2026-zabbix-k8s-stack/A full Zabbix 7.0 monitoring stack on a local k3d cluster via Helm: what the chart actually deploys, three things that broke, and a quick-start tutorial.Wed, 20 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/til/19-05-2026-til-mermaid-diagrams-in-astro/https://nordkeel.dk/blog/til/19-05-2026-til-mermaid-diagrams-in-astro/Tue, 19 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/19-05-2026-k8s-container-monitor-helm/https://nordkeel.dk/blog/projects/19-05-2026-k8s-container-monitor-helm/Two Helm charts that deploy a private OCI registry and the container monitor — docker-registry for Colima, zot for a real cluster.Tue, 19 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/18-05-2026-zabbix-agent-sim/https://nordkeel.dk/blog/projects/18-05-2026-zabbix-agent-sim/An Alpine image that auto-registers as a Zabbix host, scales to 300 pods, crashes your server, teaches you about CacheSize, and cleans up after itself on shutdown.Mon, 18 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/17-05-2026-k8s-container-monitor/https://nordkeel.dk/blog/projects/17-05-2026-k8s-container-monitor/A Go rewrite of a Python monitoring tool — ditching subprocess shell calls for native oras-go, shrinking from 130 MB to 25 MB, and picking up goroutine-based concurrency along the way.Sun, 17 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/til/15-05-2026-til-migrate-an-already-committed-large-file-to-git-lfs/https://nordkeel.dk/blog/til/15-05-2026-til-migrate-an-already-committed-large-file-to-git-lfs/Fri, 15 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/til/15-05-2026-til-obsidian-vault-folders-can-trigger-blog-sync-without-frontmatter-flags/https://nordkeel.dk/blog/til/15-05-2026-til-obsidian-vault-folders-can-trigger-blog-sync-without-frontmatter-flags/Fri, 15 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/projects/15-05-2026-self-hosting-netbird-on-kubernetes-a-zero-trust-vpn-replacement/https://nordkeel.dk/blog/projects/15-05-2026-self-hosting-netbird-on-kubernetes-a-zero-trust-vpn-replacement/A complete walkthrough of deploying a self-hosted NetBird zero-trust network on Kubernetes, with Keycloak as the identity provider and Traefik as ingress.Fri, 15 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/til/03-05-2026-til-debugging-helm-charts-with-sparse-documentation/https://nordkeel.dk/blog/til/03-05-2026-til-debugging-helm-charts-with-sparse-documentation/Sun, 03 May 2026 00:00:00 GMThttps://nordkeel.dk/blog/til/14-05-2025-kernel-panic/https://nordkeel.dk/blog/til/14-05-2025-kernel-panic/OOM killer had been silently terminating processes for weeks.Wed, 14 May 2025 00:00:00 GMThttps://nordkeel.dk/blog/snippets/10-05-2025-deleted-file-handles/https://nordkeel.dk/blog/snippets/10-05-2025-deleted-file-handles/Useful when disk usage is high but du shows nothing.Sat, 10 May 2025 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/09-12-2019-aws-with-ansilble-getting-connected/https://nordkeel.dk/blog/tutorials/09-12-2019-aws-with-ansilble-getting-connected/Mon, 09 Dec 2019 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/25-05-2017-elasticsearch-grafana-graphs/https://nordkeel.dk/blog/tutorials/25-05-2017-elasticsearch-grafana-graphs/Thu, 25 May 2017 00:00:00 GMThttps://nordkeel.dk/blog/posts/23-05-2017-going-into-cloud-networking-just-peeping/https://nordkeel.dk/blog/posts/23-05-2017-going-into-cloud-networking-just-peeping/Tue, 23 May 2017 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/21-09-2016-locked-disk-after-vm-clone/https://nordkeel.dk/blog/tutorials/21-09-2016-locked-disk-after-vm-clone/Wed, 21 Sep 2016 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/21-06-2016-working-with-zabbix-templates/https://nordkeel.dk/blog/tutorials/21-06-2016-working-with-zabbix-templates/Tue, 21 Jun 2016 00:00:00 GMThttps://nordkeel.dk/blog/posts/18-05-2016-projects-reports/https://nordkeel.dk/blog/posts/18-05-2016-projects-reports/Wed, 18 May 2016 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/21-09-2015-connecting-nodes-to-a-environment/https://nordkeel.dk/blog/tutorials/21-09-2015-connecting-nodes-to-a-environment/Mon, 21 Sep 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/21-09-2015-creating-a-puppet-environment/https://nordkeel.dk/blog/tutorials/21-09-2015-creating-a-puppet-environment/Mon, 21 Sep 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/02-06-2015-ssh-key-authentication-with-ldap/https://nordkeel.dk/blog/tutorials/02-06-2015-ssh-key-authentication-with-ldap/Tue, 02 Jun 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/28-05-2015-adding-sudo-to-ldap/https://nordkeel.dk/blog/tutorials/28-05-2015-adding-sudo-to-ldap/Thu, 28 May 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/06-05-2015-installation-of-pxe-boot-linux-and-windows/https://nordkeel.dk/blog/tutorials/06-05-2015-installation-of-pxe-boot-linux-and-windows/Wed, 06 May 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/29-03-2015-bash-colored-text-output-with-tput/https://nordkeel.dk/blog/tutorials/29-03-2015-bash-colored-text-output-with-tput/Sun, 29 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/22-03-2015-basic-management-of-ldap-users/https://nordkeel.dk/blog/tutorials/22-03-2015-basic-management-of-ldap-users/Sun, 22 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/21-03-2015-basic-ldap-installation/https://nordkeel.dk/blog/tutorials/21-03-2015-basic-ldap-installation/Sat, 21 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/08-03-2015-making-a-bootable-usb-from-an-iso-image-on-mac-os-x/https://nordkeel.dk/blog/tutorials/08-03-2015-making-a-bootable-usb-from-an-iso-image-on-mac-os-x/Sun, 08 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/posts/07-03-2015-firewall-project-proxy-and-syslogconf-anno-2013/https://nordkeel.dk/blog/posts/07-03-2015-firewall-project-proxy-and-syslogconf-anno-2013/Sat, 07 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/posts/07-03-2015-speciel-subject-nagios-with-raspberry-pi-anno-may-2013/https://nordkeel.dk/blog/posts/07-03-2015-speciel-subject-nagios-with-raspberry-pi-anno-may-2013/Sat, 07 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/05-03-2015-dnsmasq-with-puppet/https://nordkeel.dk/blog/tutorials/05-03-2015-dnsmasq-with-puppet/Thu, 05 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/01-03-2015-making-a-apt-get-proxy/https://nordkeel.dk/blog/tutorials/01-03-2015-making-a-apt-get-proxy/Sun, 01 Mar 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/16-02-2015-setting-up-a-proftp-server/https://nordkeel.dk/blog/tutorials/16-02-2015-setting-up-a-proftp-server/Mon, 16 Feb 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/16-02-2015-sql-database-with-check-constrain/https://nordkeel.dk/blog/tutorials/16-02-2015-sql-database-with-check-constrain/Mon, 16 Feb 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/05-02-2015-kippo-project-with-kippo-graph/https://nordkeel.dk/blog/tutorials/05-02-2015-kippo-project-with-kippo-graph/Thu, 05 Feb 2015 00:00:00 GMThttps://nordkeel.dk/blog/tutorials/05-02-2015-nas-openmediavault/https://nordkeel.dk/blog/tutorials/05-02-2015-nas-openmediavault/Thu, 05 Feb 2015 00:00:00 GMT