Linux
Linux configuration and troubleshooting.
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[Jenkins 02] Install Jenkins on Rocky Linux 9: DNF, SELinux and Firewall
Install Jenkins on Rocky Linux 9 and inspect the Java, service, firewall and SELinux requirements for web access.
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[Jenkins 01] Install Jenkins LTS on Ubuntu: Java, Setup and Access
Prepare Java and the Jenkins repository on Ubuntu, install Jenkins LTS, and check the service and initial web setup.
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[Kubernetes Lab 01] Prepare Windows 11, VMware and Rocky Linux
Plan and create the three Rocky Linux VMs for a Kubernetes lab running in VMware on a Windows 11 host.
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[Kubernetes Lab 02] Rocky Linux IP, Time and Kernel Settings
Set stable addresses and hostnames, synchronize time, and check kernel and network settings on the three Rocky Linux lab VMs.
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[Kubernetes Lab 03] Install containerd 2.x and kubeadm
Prepare containerd and the Kubernetes packages, check runtime settings, and verify the prerequisites for kubeadm.
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[Kubernetes Lab 09] Diagnose Pod Failures and Drain a Node
Use Pod events, logs and node conditions to diagnose a failure, then drain and return a worker node to service.
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Fix docker ps Permission Denied on Linux: Docker Group and Daemon Checks
Diagnose docker ps errors, verify the daemon and socket, add the intended user to the docker group, and refresh session permissions.
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How to Open a Port with firewalld on Rocky Linux 9
Open and verify a port in the correct firewalld zone on Rocky Linux 9, keep the rule after reboot, and remove it when no longer needed.