Programmer Think

1, run method of QuorumPeer Above Just preparing for the Leader election, but it hasn't triggered the election process. In the start method, after calling startLeaderElection(), the QuorumPeer thread will start. Next we'll start with his run method. public void run() { try { while (running) { switch (ge ...

First meet Zookeeper Zookeeper is a sub project under the Apache Hadoop project. It is a tree directory service. The zoo keeper is used to manage Hadoop, Hive, Pig and other animals. Zookeeper is a distributed, open source, distributed application coordination service. The most commonly used functions: configuration management, distributed lo ...

Introduction to registration center Background analysis In microservices, the first problem we need to face is how to find services (software is a service), and the second is how to communicate between different services? How to manage each service in the application better and more conveniently, and how to establish the link between various ...

dispatch Create a pod workflow kubernetes realizes the decoupling of interaction between components based on the controller architecture of list watch mechanism. Other components monitor their own resources. When these resources change, Kube apiserver will notify these components. This process is similar to publish and subscribe. Main a ...

When dynamically allocating pv in ceph # rbd storage, I encountered the problem that pod cannot be deleted twice (the specific reason is not understood yet). All pods display the Terminating status. Use the following command to forcibly delete: kubectl delete pods <pod> --grace-period=0 --force However, after the pod is deleted, the pvc ...

Why should Kubernetes be deployed on arm64 platform, and it is the architecture of Kunpeng 920. it's a long story... 5000 words are omitted here. Introduce the system information; • architecture: Kunpeng 920 •OS: openEuler 20.03 (LTS-SP1) •CPU: 4c • memory: 16G • hard disk: Several Although the whole process refers to the post ...

Since Apache RocketMQ entered the vision of global developers in 2016, it has developed into the core data base of technology in e-commerce, finance, education, science and technology and other fields.According to incomplete statistics, more than 70% of domestic users (including top 100 enterprises in various fields such as finance, insurance, ...

kubernetes persistent storage PV and PVC 1. Introduction of PV and PVC Volume provides a very good data persistence scheme, but there are still deficiencies in manageability. Take the previous example of AWS EBS. To use Volume, Pod must know the following information in advance: The current Volume is from AWS EBS. The EBS Volume has been crea ...

1, kubectl command kubectl is the command line tool of Kubernetes cluster. kubectl can manage the cluster itself and install and deploy container applications on the cluster The command format is as follows kubectl [command] [type] [name] [flags] parameter command: Specifies the operations to be performed on the resource, such as crea ...

Earlier, we introduced the basic concepts of Prometheus, including data format and PromQL syntax. In this section, we will explain how to realize host monitoring through Prometheus. Prometheus uses various exporters to monitor resources. The Exporter can be regarded as the agent side of monitoring. It is responsible for collecting the indicato ...