System Operations
Technical guides on System Operations.
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PostgreSQL 18 on Rocky Linux 9: Native and Docker Installation, Roles, and App Access
Install PostgreSQL 18 on Rocky Linux 9 with PGDG packages or Docker Compose. Learn OS versus database identities, postgres access, password rotation, application roles, Python connections, and backup restoration.
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Build a Local chronyd Time Server on Rocky Linux 9
Configure chronyd for internal clients, verify synchronization and distinguish an upstream-backed server from a disconnected local time source.
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Build a Local Package Repository for Rocky Linux 9 and Ubuntu 24.04 or 26.04
Prepare RPM and APT repositories, publish their metadata and signatures, and verify package sources from the client system.
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Use cloud-init to Configure a VM on First Boot
Read cloud-init’s data sources and stages, prepare first-boot configuration and inspect the logs before repeating or repairing a run.
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Start with Ansible: SSH Access and a First Playbook
Prepare SSH access and an inventory, test connectivity and run a first Ansible playbook with the required privileges.
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Run Ollama Models on Linux: Installation, Service and Local API
Install Ollama on Linux, check the server and model state, and call the local API with the intended model.
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Use systemd: Create, Edit and Remove Services and Read journalctl Logs
Write and inspect systemd service units, apply changes, read logs and remove a custom service without losing unrelated configuration.
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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.