Programmer Group

1, File processing 1. Create an object of File class File Class creation function Method name: 1.public boolean creatNewFile()(When the file with this name does not exist, create a new empty file named by this abstract pathname) 2.public boolean mkdir()(Create a folder named after this abstract pathname) 3.public boolean mkdirs()(Create ...

1. Virtualized network Network Namespace is a function provided by Linux kernel and an important function to realize network virtualization. It can create multiple isolated network spaces with independent network stack information. Whether it is a virtual machine or a container, it seems as if it is running in an independent network. Moreo ...

Background: Network environment reference: Cloud networking experience Two vpc networks in Shanghai and Beijing. The servers are distributed as follows: Let's talk about why we use TencentOS Server 3.1 (TK4) system. It's not because CentOS 8 doesn't provide long-term maintenance... By the way, experience Tencent cloud's open source tencentos. ...

1, What is a vector? A Vector is a Sequence container that encapsulates a dynamic size array. Like any other type of container, it can hold various types of objects. It can be simply considered that a Vector is a dynamic array that can store any type. 2, Container characteristics 1. Sequence The elements in the order container are sorted ...

1 What is a Docker image The Docker image is an overlay of the file system. At the bottom is a file boot system, bootfs. Docker users will not have direct interaction with the boot file system. The second layer of the Docker image is the root file system rootfs, which is usually one or more operating systems, such as ubuntu. In Docker, the ...

Users Accounts Authenticationkubeconfig configuration fileAs mentioned earlier, communication between K8S is achieved through https, which requires authentication every time, such as when we enter a command from the command line[root@k8s-master ~]# kubectl get podRequires https authentication, and https is stateless link means that certificates ...

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 created in advance and the exact volume ID ...

Etcd is a very important Service of kubernetes cluster. It stores all data information of kubernetes cluster, such as Namespace, Pod, Service, routing and other status information. In case of etcd cluster disaster or etcd cluster data loss, it will affect k8s cluster data recovery. Therefore, it is very important to backup etcd data to realize ...

1, What is docker Containers in docker: lxc --> libcontainer --> runC 2, OCI & OCF OCI Open Container-initiative Led by the Linux foundation, it was founded in June 2015It aims to develop an open industrial standard around container format and runtimecontains two specifications the Runtime Specification(runtime-spec)the ...

Hello, I'm Zhang Jintao.Kubernetes, as the cornerstone of the cloud, has brought us great convenience. More and more companies have also applied kubernetes to the production environment. However, while enjoying the convenience it brings, we also need to pay attention to some potential safety hazards.In this article, I will focus on container im ...