Infrastructure tutorials

Production-grade guides for Linux, servers, security and performance. Copy-paste commands, multi-distro support, written by engineers who run this in production.

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Install and configure Deno for web development with systemd and reverse proxy

hosting
10,968

Fix apt update E: Repository no longer has a Release file

linux
8,280

Install and configure Uptime Kuma for website monitoring with SSL and email alerts

monitoring
6,875

Install and configure Caddy web server with automatic HTTPS and reverse proxy

hosting
6,048

Install and configure TimescaleDB with PostgreSQL for high-performance time-series data

databases
5,526

Recently published

Check disk space usage on Linux with df and du commands

linux
1 day ago

Find and kill processes using a specific port on Linux

linux
5 days ago

Fix PostgreSQL FATAL sorry, too many clients already

linux
1 week ago

Configure Istio multi-cluster disaster recovery and automated failover

devops
2 weeks ago

Set up automated MariaDB Galera cluster backups with compression

databases
1 month ago
"database" × Clear all
linux Beginner

Check disk space usage on Linux with df and du commands

Learn how to check disk space on Linux using df and du, find large files and directories, spot hidden disk usage from deleted but open files, and troubleshoot common out-of-space problems.

15 min 7 distros 27 views
linux Beginner

Find and kill processes using a specific port on Linux

Learn how to find which process is using a specific port on Linux, identify its owner safely, and kill it with the right tool. Covers lsof, ss, fuser, and how to prevent address already in use errors for good.

15 min 7 distros 93 views
linux Beginner

Fix PostgreSQL FATAL sorry, too many clients already

Learn why PostgreSQL throws FATAL: sorry, too many clients already, how to check and close idle connections, safely raise max_connections, and prevent the error from coming back with connection pooling.

20 min 4 distros 128 views
databases Intermediate

Set up automated MariaDB Galera cluster backups with compression

Learn how to build a cluster-safe backup strategy for MariaDB Galera using Mariabackup, compression, systemd timers and remote storage offloading, with verification and node restore procedures.

40 min 4 distros 294 views
databases Advanced

Configure MariaDB ColumnStore for high-performance analytics workloads

Deploy and tune MariaDB ColumnStore for columnar analytics, covering single-node and multi-node cluster setup, table design, memory tuning, bulk loading with cpimport, and cluster health monitoring.

45 min 4 distros 294 views
monitoring Advanced

Configure Logstash 8 security pipelines with threat intelligence enrichment

Build a production Logstash 8 pipeline that ingests firewall, IDS and syslog data, enriches events with MISP, AlienVault OTX and AbuseIPDB threat intel, and ships hardened IOC-enriched events to Elasticsearch.

75 min 4 distros 453 views
devops Advanced

Configure Ansible Vault integration with HashiCorp Vault for secrets management

Learn how to combine Ansible Vault with HashiCorp Vault using the community.hashi_vault collection, AppRole authentication, and least-privilege policies for production-grade secrets management in playbooks.

45 min 4 distros 561 views
databases Advanced

Configure PostgreSQL 17 SSL encryption and certificate-based authentication

Set up a private CA, issue server and client certificates, enforce TLS 1.2+ with strong ciphers, and configure pg_hba.conf for mutual TLS client certificate authentication in PostgreSQL 17.

45 min 4 distros 829 views
databases Intermediate

Configure PostgreSQL 17 connection pooling with PgBouncer for high availability

Deploy PgBouncer in front of PostgreSQL 17 with session, transaction and statement pooling modes, SCRAM-SHA-256 authentication, keepalived-based HA, and Prometheus monitoring for production workloads.

45 min 4 distros 963 views
devops Advanced

Configure Kubernetes secrets management with External Secrets Operator and HashiCorp Vault

Learn how to deploy External Secrets Operator on Kubernetes, integrate it with HashiCorp Vault using the Kubernetes auth method, and sync secrets via SecretStore and ClusterSecretStore resources with production-grade RBAC and monitoring.

75 min 4 distros 969 views
networking Advanced

Implement enterprise network QoS with Cisco integration using FRRouting and traffic shaping

Configure enterprise-grade Quality of Service policies with DSCP marking, traffic shaping using tc and HTB, and seamless integration with Cisco equipment through FRRouting BGP and OSPF routing protocols for comprehensive network bandwidth management.

45 min 4 distros 1,301 views
devops Intermediate

Implement Kubernetes RBAC with service accounts and role-based access control

Configure Kubernetes role-based access control (RBAC) with service accounts, roles, and role bindings to enforce secure access policies and namespace isolation in your cluster.

45 min 4 distros 1,367 views

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