Cilium v1.7 Documentation

### Cilium v1.7 Documentation Summary Cilium v1.7 documentation provides comprehensive guidance on setting up, configuring, and managing Cilium, a modern network and security controller for Kubernetes. Below is a structured summary of the key sections and their core content: --- #### **1. Introduction** - Cilium is designed to simplify networking and security for containerized applications, focusing on high performance and scalability. - The documentation is organized into sections covering installation, concepts, architecture, policy enforcement, monitoring, troubleshooting, and more. --- #### **2. Key Sections Overview** - **Getting Started Guides**: Offers tutorials for running Cilium on a local machine and applying security policies between containers. - **Concepts**: Explains Cilium's components, deployment models, and essential concepts needed for a full deployment. - **Architecture**: Details Cilium's architecture and its integration with Kubernetes and other orchestration systems. - **Installation**: Provides instructions for installing, configuring, and troubleshooting Cilium in various deployment modes. - **Policy Enforcement Modes**: Walks through the structure of Cilium's policy language and supported formats. - **Monitoring & Metrics**: Guides users on configuring metrics collection for monitoring Cilium's performance. - **Troubleshooting**: Helps resolve issues during Cilium deployment and operation. - **BPF and XDP Reference Guide**: Offers technical insights into BPF and XDP for developers. - **API Reference**: Details the Cilium agent API for interacting with a local instance. - **Contributing**: Provides instructions for contributing to the Cilium project, including setting up a development environment and submitting pull requests. --- #### **3. Upgrade Notes (1.7.13)** - **Important Pre-Upgrade Steps**: - Ensure Kubernetes version is at least 1.11.0. - Helm 3 (v3.0.3 or later) is required. - Enable the `enable-remote-node-identity` flag in ConfigMap to avoid connectivity issues during upgrades. - **ENI IPAM Mode Fix**: - A new flag `--egress-multi-home-ip-rule-compat` is introduced to handle compatibility during upgrades. - Setting this flag to `true` prevents migration, while `false` triggers a migration to the new ENI datapath. - Users must set the flag to `true` before downgrading to v1.7.12 or earlier to avoid connectivity disruption. --- #### **4. Installation and Setup** - **Helm Installation**: - Add the Cilium Helm repository: `helm repo add cilium https://helm.cilium.io/`. - Validate installation using `kubectl` commands to check pod status. - **Connectivity Testing**: - A connectivity test (`connectivity-check`) is available to verify pod-to-pod communication under various network policies. --- #### **5. Architecture and Components** - Cilium leverages BPF and XDP for efficient networking and security enforcement. - It integrates seamlessly with Kubernetes, Istio, and other orchestration systems. - The architecture emphasizes scalability, performance, and compatibility with existing infrastructure. --- #### **6. Policy Enforcement** - Cilium uses a flexible policy language to enforce network rules, including service-to-service communication and egress controls. - Policies can be defined in YAML or JSON formats and applied across clusters. --- #### **7. Monitoring and Metrics** - Cilium provides detailed metrics for monitoring network performance and security events. - Metrics can be collected and visualized using tools like Prometheus and Grafana. --- #### **8. Troubleshooting** - Troubleshooting guides help resolve common issues, such as connectivity problems and policy enforcement failures. - Logs and diagnostic tools are provided to assist in debugging. --- #### **9. Glossary** - Definitions of key terms like CNI, ConfigMap, CustomResourceDefinition, and others are included for reference. --- #### **10. Release Process and Versioning** - Cilium follows a structured release process with minor and micro releases. - Three stable branches are maintained, with micro releases for bug fixes and security updates. --- This summary captures the essential information from the Cilium v1.7 documentation, focusing on core concepts, installation, upgrade notes, and key features. For detailed instructions, refer to the full documentation.