Requirements There is a integer array arr and a window of size w that slides from the leftmost to the rightmost part of the array, with the window sliding one position at a time to the right. For example, the array is [4,3,5,4,3,3,6,7], and the window size is 3. If the length of the array is n and the window size is w, …

Read More

kubernetes各个组件都是加密通信的, 那么都有哪些证书、各个证书怎么交互、这些证书什么时候过期，这个就变得至关重要; 本文引用了一些其他网络内容(均已附上原文链接)，并适当补充完善，用于让新手完善熟悉kubernetes证书体系(如有侵权联系邮箱可以删除)。 一、数字证书原理 1.1 传统非对称加密 1message --> (公钥加密) --> || 传输 || --> (私钥解密) --> message 注意: 1.这里与数字证书认证相反，是公钥加密私钥解密 2.公钥私钥需要是一个秘钥对 1.2 哈希函数 1message --> H(message) --> Hash …

Read More

ingress在将流量发往后端的时候是不经过kube-proxy的，ingress controller会直接和kube-apiserver进行交互，然后获取pod endpoints和service的对应关系，进行轮询，负载均衡到后端节点。 一、验证试验 从集群中删除kube-proxy，查看通过ingress的方式是否可以访问成功? 1# 实验中选择的是"iptables模式的kube-proxy" 2# 首先关闭kube-proxy 3$ sudo systemctl stop kube-proxy 4 5# 查看服务，ClusterIP的端口是8080，NodePort的端口是30948 6$ ks …

Read More

Requirements A stack whose elements are of type integer now wants to sort the stack from top to bottom in order from smallest to largest, and only one stack is allowed to be requested. Other than that, new variables can be requested, but no additional data structures can be requested. How to complete the sorting? …

Read More

kong、apisix是当前比较火的两款开源api网关，本文对比了二者的部署、使用方式；提供一个简单的参考; 对于kong，大家都比较熟悉，但是对于apisix可能熟悉的并不多，那么kong、apisix在使用方式，功能命名上是否有相似，还是理念不同，请看下文。 一、kong 1.1 安装 1# 安装kong 2$ helm repo add kong https://charts.konghq.com 3$ helm repo update 4$ helm fetch kong/kong 5$ tar xf kong-2.5.0.tgz 6$ cd kong 7$ ls 8CHANGELOG.md Chart.yaml …

Read More

Ansible 是一个开源的基于 OpenSSH 的自动化配置管理工具。可以用它来配置系统、部署软件和编排更高级的 IT 任务，比如持续部署或零停机更新。 一、ansible 简介 Ansible 的主要目标是简单和易用，并且它还高度关注安全性和可靠性。基于这样的目标，Ansible 适用于开发人员、系统管理员、发布工程师、IT 经理，以及介于两者之间的所有人。Ansible 适合管理几乎所有的环境，从拥有少数实例的小型环境到有数千个实例的企业环境。 1.1 ansible 变量优先级如下 command line values (eg "-u user") role defaults inventory …

Read More

Requirements Dog and cat have implemented the Pet interface, you can use getPetType() to view the corresponding animal type; NewDog(), NewCat() can create new dog and cat objects respectively. 1type Pet interface { 2 getPetType() string 3} 4 5type fatherPet struct { 6 Type string 7} 8 9func (fp *fatherPet) getPetType() …

Read More

Requirements A stack is pressed into 1, 2, 3, 4, 5, then from the top of the stack to the bottom of the stack is 5, 4, 3, 2, 1. After transposing this stack, from the top of the stack to the bottom of the stack is 1, 2, 3, 4, 5, that is, to achieve the reverse order of the stack elements, but only with recursive …

Read More

Requirements Write a class that implements a queue with two stacks and supports the basic operations of a queue: add, poll, peek Solving Ideas stacks are characterized by last-in-first-out, queues are characterized by first-in-first-out one stack as a press-in stack, the other stack as a pop-up stack, as long as the …

Read More

Requirements the time complexity of pop, push, getMin operations are O(1) the design of the stack type can use the ready-made stack structure Solving Ideas use two stacks, starkData and stackMin compare the size of the top data of stackMin with that of starkData each time it is pressed in, and press the new minimum …

Read More