5.4 Explain the importance of tools used in DevOps environments.

Tools

Ansible

Agentless configuration management and automation using YAML playbooks over SSH or WinRM.

Docker

Builds and runs containers from Dockerfiles.

Elasticsearch, Logstash, and Kibana (ELK) stack

Log pipeline: Logstash ingests, Elasticsearch stores and searches, Kibana visualises.

Git

Distributed version control system.

GitHub actions

CI/CD workflows defined in YAML inside GitHub repositories.

Grafana

Dashboards and alerting for metrics and logs from many data sources.

Jenkins

Self-hosted automation server for CI/CD pipelines with many plug-ins; keep it patched and locked down.

Kubernetes

Container orchestration platform.

Terraform

Declarative infrastructure-as-code tool that works across providers using state files (protect state; it can contain secrets).