unrelated. Is GitOps something that application developers use? Is it for infra- structure folks or system administrators? Is it something you can buy off the shelf? Or is it just a fancy new term for DevOps change took down their entire hosting platform, but the DevOps engineers were able to bring back the system in about 40 minutes. When asked how they did it so quickly, they described their process, which cofounder Alexis Richardson called “GitOps.” The DevOps engineers over at Weaveworks came up with a system that allowed them to return their entire platform (not just the workloads running on them) back

significantly speed up your team’s ability to ship features. eBook 4 The Principles of GitOps The entire system is described declaratively. Kubernetes is just one example of many modern cloud native tools that reproduced. --------------- --- The canonical desired system state is versioned in Git. With the declaration of your system stored in a version control system, and serving as your canonical source of truth automatically applied to the system. Once you have the declared state kept in Git, the next step is to allow any changes to that state to be automatically applied to your system. What’s significant about

straight-forward: ● Infrastructure as Code: Git is always the source of truth on what happens in the system ● Code changes always go through an automated process ● Deployments, tests, and rollbacks controlled at any moment. Those continuously compare the current state with the desired state to ensure the system is running like expected. The most popular GitOps tools today are ​Flux ​and ​ArgoCD​. As several GitOps has been heralded as a way to decouple CI from deployments. In the classic use of a CI/CD system, the last step in the pipeline is a deployment step. Classic pipeline With GitOps you

• GitOps for Kubernetes Essentials • Conclusion Git is the most widely used version control system, with more than 80 percent of its market share in today’s software industry. GitOps is a methodology infrastructure definitions can be kept alongside application code in Git. Keeping your entire system in Git means that your development team uses familiar Git-based workflows and pull requests to (VCS) like Git should be the only source of truth. Whatever changes one wants to perform in the system should be declared and always committed first in Git or the GitLab repo alone. This helps to identify

delivery teams can release software continuously, and with full confidence in the reliability of the system. THE GITOPS GUIDE TO BUILDING & MANAGING INTERNAL PLATFORMS 3 weave.works ▼ Self-service In the past, the only way a developer could get access to servers, data, or software was to ask a system administrator. In the modern era, however, developers require on-demand access to a variety of tools better way to access these tools and resources that eliminate obstacles. Developers should not have to file a list of support tickets and wait forever to get what they need. It’s a good idea to have a consistent

Everyone Developers Operations Kubernetes Cluster Node 1 Kubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications. TLDR; It is hierarchical directory structure of bases and overlays. ● A base is a directory with a kustomization.yaml file that contains a set of resources and associated customization. ○ A base has no knowledge of an overlay overlay and can be used in multiple overlays. ● An overlay is a directory with a kustomization.yaml file that refers to other kustomization directories as its bases ○ An overlay may have multiple bases

truth for declarative infrastructure and application code. In GitOps, the desired state of the system is versioned and stored in a Git repository, and a reconciliation loop continuously monitors and published by the GitOps Working Group: The desired state of a GitOps managed system must be: 1. Declarative A system managed by GitOps must have its desired state expressed declaratively the source. 4. Continuously reconciled Software agents continuously observe the actual system state and attempt to apply the desired state. The Philosophy of GitOps | 07 3 KEY ELEMENTS

apply when implementing and dealing with GitOps. Let’s take a look. Declarative system In the GitOps model, the complete system is configured declaratively. This declarative approach is focused on the result facilitating convenient deployments and rollbacks. The system state is versioned in Git All the declarative states are stored in the version-controlled system, which acts as the single source of truth. With With this version-controlled approach, all the system infrastructure changes are available chronologically, enabling users to identify infrastructure changes over time easily. It is also helpful in: Troubleshooting

code. The system’s entire infrastructure must be described in Git. After a PR is merged, the changes are automatically applied using tools like Weave Kubernetes Platform. Once the system is described require cluster credentials or manual intervention to make a change to the system. As a segregated environment, the system can only be changed through Git, thereby reducing user error and speeding WKP includes enterprise-grade features that extend the richness of GitOps using a model-based system to configure and define clusters and components. The underlying architecture of WKP is based entirely

接口实现的调研及方案设计。 rename 操作，主要操作的是 dentry，如 rename /dir1/file1 /dir2/file2，主要有 2 个步骤：(1) 删除 file1 的 dentry，(2) 增加 file2 的 dentry（该 dentry 的 inodeid 等同 file1 的 inode id）。 关于 rename 接口的实现，主要调研了 chubaofs 和 juicefs，而 4. (1) 用户不能在源目录或目标目录下创建相应文件了，因为文件名被占用了（如 rename /dir1/file1 /dir2/file2，既不能在 /dir1 目录下创建 file1，也不能在 /dir2 目录下创建 file2 ） (2) 并且因为存在硬链接，不能通过再次 rename 来获取成功（一般用户 rename 返回失败后，有可能希望再次执行 when overwriting there will probably be a window in which both oldpath and newpath refer to the file being renamed rename(3) - Linux man page This rename() function is equivalent for regular files