Helm

Introduction The Certified Kubernetes Application Developer (CKAD) exam is a hands-on, command-line-heavy challenge that tests your ability to design, build, and deploy applications in Kubernetes - all while racing the clock. I recently took the CKAD and passed with an overall score of around 82%. Not perfect - but let’s be honest, in a terminal-only, time-boxed environment, "running" is the new "succeeding" 😄. This article collects the practical snippets, workflows, and quick references I used during my preparation. ...

Figure 1. Kafdrop Topic Viewer In the ever-expanding world of data streaming and event-driven architecture, Apache Kafka has emerged as a cornerstone for reliable and scalable data processing. However, managing and monitoring Kafka clusters can often present its own set of challenges. This is where Kafdrop, a web-based Kafka consumer group and topic viewer, comes to the rescue. With its intuitive interface and insightful visualizations, Kafdrop offers developers and operators an efficient way to gain valuable insights into Kafka clusters. ...

Common operations Add Helm Repository helm repo add NAME URL e.g. for the Bitnami repository: helm repo add bitnami https://charts.bitnami.com/bitnami 1 ↵ "bitnami" has been added to your repositories List Repositories helm repo list 130 ↵ NAME URL bitnami https://charts.bitnami.com/bitnami Searching in a Helm Repository helm search repo wordpress NAME CHART VERSION APP VERSION DESCRIPTION bitnami/wordpress 15.2.30 6.1.1 WordPress is the world's most popular blogging ... bitnami/wordpress-intel 2.1.31 6.1.1 DEPRECATED WordPress for Intel is the most popu... ...

Administration & Configuration Connections Show Max Connections (value and source) SELECT setting, source, sourcefile, sourceline FROM pg_settings WHERE name = 'max_connections'; Set Max Connections ALTER system SET max_connections = 250; Kill Connections for a Database SELECT pg_terminate_backend(pid) FROM pg_catalog.pg_stat_activity -- we don't want to kill our own connection WHERE pid != pg_backend_pid() -- we don't want to kill connections to other databases AND datname = 'MYDATABASE' Show Statement Timeout Settings for All Users SELECT r.rolname, (SELECT unnest(s.setconfig) FROM pg_db_role_setting s WHERE s.setrole = r.oid AND s.setconfig::text LIKE '%statement_timeout%' LIMIT 1) AS statement_timeout FROM pg_roles r WHERE r.rolcanlogin ORDER BY r.rolname; ...