as the infrastructure layer managing the applications. One day there was an incident where a configuration change took down their entire hosting platform, but the DevOps engineers were able to bring back infrastructure stack instead of just one object. We’ve seen that the desired state is pulled from configuration information that is versioned and stored in an immutable storage system. If there is a difference the entire software infrastructure at a datacenter using configuration files that are both ma- chine-readable and human-readable. The configuration files are machine-readable in a structured format (usually

Production ⼀條龍 ⼯程師 Configuration Provision Code Deploy CI / CD Production ⼀條龍 ⼯程團隊 Configuration Automation Code Deploy CI / CD Production ⼀條龍 ⼯程團隊 Configuration Automation Ops / Infra GitLab 說的~ GitOps = IaC + MRs + CI/CD Infrastructure as Code Infrastructure System Configuration Application Configuration GitOps = IaC + MRs + CI/CD Merge Requests GitOps = IaC + MRs + CI/CD Continuous Monitor Production branch Feedback Code Review CI/CD Pipeline Commit 檢查 .gitlab-ci.yml GitLab Server 產⽣ CI/CD Pipeline GitLab Runner 執⾏ Job CI Job 回傳 Logs 顯⽰於 Pipeline Terraform Ansible Cloud

have no visibility or record of configuration changes in environments I can’t easily rollback changes to a specific version I can’t audit configuration changes 4 ● All changes are auditable OpenShift and GitOps - A Perfect Match ● OpenShift is a declarative environment ○ Cluster configuration is declared and Operators make it happen ○ Application deployments are declared and Kubernetes metadata: name: product-catalog-dev namespace: argocd spec: destination: namespace: argocd server: https://kubernetes.default.svc project: product-catalog source: path: manifests/app/overlays/dev-quay

native tools that are “declarative” and that can be treated as code. Declarative means that configuration is guaranteed by a set of facts instead of by a set of instructions. With your application’s continuous integration environment Runs inside the production cluster Read/Write access to configuration repository Read access to image repository Read/Write access to the production cluster GitOps clicking on the Explore tab. For automated deployments and GitOps, there is one additional configuration step that we will cover in part two of this tutorial. Part 1: Spin up a Kubernetes Cluster

to clusters through Git history Visibility and Audit Review changes beforehand, detect configuration drifts, and take action Enhanced Security Familiar tools and Git workflows from application Kubernetes-native declarative CI/CD ● Pipelines run on-demand in isolated containers ● No central server to maintain! No plugin conflicts! ● Task library and integration with Tekton Hub ● Secure pipelines Detect drift Take action Argo CD ● Cluster and application configuration versioned in Git ● Automatically syncs configuration from Git to clusters ● Drift detection, visualization and correction

规范，配备了业界领先的 Web Terminal 方案，交互界面美观、用户体验好。采纳分布式架构，支持多机 房跨区域部署，支持横向扩展，无资产数量及并发限制。 CMDB 全称为配置管理数据库，Configuration Management Database, 用于保 存构筑企业 IT 及应用的资源信息、资源归属信息、应用系统应用信息、以 及资源与资源关系信息，为 IT 系统运维、运营、管理，应用开发测试运维 每两小时整点 同步 LDAP 用户 sync.extra.user=0 0 0/2 * * ? * 每两小时整点 虚拟机服务 同步虚拟机/宿 主机监控 sync.cloud.resource.server.metric=0 35 0/1 * * ? 每个小时的 35 分 同步存储监控 sync.cloud.resource.datastore.metric=0 30 0/1 * * ?

Ecosystems NINAD DESAI STAFF ENGINEER, INFRACLOUD CONTENTS • About GitOps for Kubernetes • Configuration Management in Kubernetes • GitOps for Kubernetes Essentials • Conclusion Git is the most experience. In the last few years, the number of tools and systems needed to manage version control, configuration management, Infrastructure as Code, CI/CD, and observability have drastically increased. This Thus, to improve developer experience, GitOps emerged where infrastructure and application configuration changes revolve around Git, i.e., the version control ecosystem. The focus is entirely on

#IstioCon Target audience ✅ If you want to ... ● play with Istio offerings ● see the actual configuration files ● understand how Istio can be used / installed with other services ● know what multicluster Install into some cluster ● Tweak some simple configuration ● Add / remove offerings you are keen to test and see in action ● Add custom configuration on top of simple setup ● Install in cluster Install into some cluster ● Tweak some simple configuration ● Add / remove offerings you are keen to test and see in action ● Add custom configuration on top of simple setup With requirements such

entire software stack through Git and treat your servers as your source code. Every change and configuration is done through a pull request and everyone has access to the application, which can be rolled you should trust the platform you are building on. With GitOps, you can make sure that each configuration change is verified by your peers and automatically tested before it is deployed. Your platform Git as the single source of truth, and all platform configuration stored in Git, platform operations can be automated with ease. Whenever configuration drift occurs, it is immediately spotted and corrected

treat everything as code – from the application code itself to the underlying infrastructure and configuration – you can keep it in version control. This means the desired state and any changes of an entire ecosystem of cloud native tools are declarative, as opposed to imperative, which allows for configuration to be treated as code. It is this declarative nature that enables the infrastructure to be held make crucial decisions before they deploy new features. Features or other updates like cluster configuration can be pushed to Git and then observed in real-time – and rolled back if necessary. This means