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Application container logging and monitoring

In containerized and Kubernetes-based environments, effective application logging and monitoring are essential components of a Platform as a Service (PaaS) capability^[400-devops-06-kubernetes-k8s-paas-08spinaker.md] This ensures operational reliability by providing visibility into application behavior and infrastructure health^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

Monitoring with Prometheus

Prometheus is a core tool used for monitoring containerized applications^[400-devops-06-kubernetes-k8s-paas-08spinaker.md] It collects and stores Metrics as time-series data, which is essential for tracking the performance and health of services running in a cluster^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

When deploying applications, integration with Prometheus typically involves configuring specific service annotations or endpoints that allow the Prometheus server to scrape Metrics from the application targets^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

Logging with ELK

The ELK stack is widely adopted for centralized log management^[400-devops-06-kubernetes-k8s-paas-08spinaker.md] This stack facilitates the aggregation, processing, and visualization of logs generated across the container orchestration platform^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

Data Flow

  1. Collection: Logs from running containers are collected. In Kubernetes environments, this is often handled by running a logging agent (such as Filebeat) as a sidecar container within the Pod^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]
  2. Aggregation: The collected logs are forwarded to Logstash or directly to Elasticsearch for storage^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]
  3. Visualization: Users can query and visualize the log data using Kibana^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

Configuration

To ensure logs are correctly captured and shipped, the application deployment configuration must include the necessary logging agents. For example, a Pod definition may be extended with a specific container for Filebeat that mounts the application's log directory^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]

Sources

^[400-devops-06-kubernetes-k8s-paas-08spinaker.md]