当前位置: 首页 > news >正文

K8S cluster with multi-masters on Azure VM

拓扑参考:

在这里插入图片描述

在 Azure VM 实例上部署 KubeSphere

  • 基础模板
    需要修改 IP 地址和 VM Image的可以在模板中修改。

    {"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#","contentVersion": "1.0.0.0","parameters": {"vmNamePrefix": {"defaultValue": "master-","type": "String","metadata": {"description": "The name of your VM master node."}},"vmssName": {"defaultValue": "node","type": "String","metadata": {"description": "The name of your VMSS cluster."}},"location": {"defaultValue": "[resourceGroup().location]","type": "String","metadata": {"description": "Location for all resources."}},"adminUsername": {"type": "String","metadata": {"description": "Username for the Virtual Machine."}},"adminKey": {"type": "SecureString","metadata": {"description": "SSH Key for the Virtual Machine."}},"defaultMasterCount": {"defaultValue": 3,"type": "Int","metadata": {"description": "The default instances count of master"}},"defaultNodeCount": {"defaultValue": 3,"type": "Int","metadata": {"description": "The initial node size of your VMSS cluster."}},"minNodeCount": {"defaultValue": 1,"type": "Int","metadata": {"description": "The min node size of your VMSS cluster."}},"maxNodeCount": {"defaultValue": 20,"type": "Int","metadata": {"description": "The max node size of your VMSS cluster."}},"dnsLabelPrefix": {"defaultValue": "[toLower(concat('k8s-cluster-', uniqueString(resourceGroup().id)))]","type": "String","metadata": {"description": "Unique DNS Name for the Public IP used to access the Virtual Machine."}},"vmSize": {"defaultValue": "Standard_DS2_v2","type": "String","metadata": {"description": "The size of the VM"}},"virtualNetworkName": {"defaultValue": "vNetwork","type": "String","metadata": {"description": "Name of the Virtual Network"}},"subnetName": {"defaultValue": "Subnet","type": "String","metadata": {"description": "Name of the subnet in the virtual network"}},"vmssSubnetName": {"defaultValue": "nodeSubnet","type": "String","metadata": {"description": "Name of the VMSS subnet in the virtual network"}},"publicLBName": {"defaultValue": "publicLB","type": "String","metadata": {"description": "Internal Load Balancer name"}}},"variables": {"publicIPAddressName": "[concat(parameters('publicLBName'), 'IP' )]","availabilitySetName": "masterAvSet","networkInterfaceName": "[concat(parameters('vmNamePrefix'),'Interface')]","networkSecurityGroupName": "[concat(parameters('virtualNetworkName'),'nsg-default')]","subnetRef": "[resourceId('Microsoft.Network/virtualNetworks/subnets', parameters('virtualNetworkName'), parameters('subnetName'))]","vmssSubnetRef": "[resourceId('Microsoft.Network/virtualNetworks/subnets', parameters('virtualNetworkName'), parameters('vmssSubnetName'))]","osDiskType": "Standard_LRS","publicLBID": "[resourceId('Microsoft.Network/loadBalancers',parameters('publicLBName'))]"},"resources": [{"type": "Microsoft.Network/networkSecurityGroups","apiVersion": "2015-06-15","name": "[variables('networkSecurityGroupName')]","location": "[parameters('location')]","properties": {"securityRules": [{"name": "Port_SSH","properties": {"description": "SSH","protocol": "*","sourcePortRange": "*","destinationPortRange": "22","sourceAddressPrefix": "*","destinationAddressPrefix": "*","access": "Allow","priority": 100,"direction": "Inbound","sourcePortRanges": [],"destinationPortRanges": [],"sourceAddressPrefixes": [],"destinationAddressPrefixes": []}},{"name": "Port_API_Server","properties": {"description": "k8s API Server","protocol": "TCP","sourcePortRange": "*","destinationPortRange": "6443","sourceAddressPrefix": "*","destinationAddressPrefix": "*","access": "Allow","priority": 140,"direction": "Inbound","sourcePortRanges": [],"destinationPortRanges": [],"sourceAddressPrefixes": [],"destinationAddressPrefixes": []}},{"name": "Port_Http","properties": {"description": "Web","protocol": "TCP","sourcePortRange": "*","destinationPortRange": "80","sourceAddressPrefix": "*","destinationAddressPrefix": "*","access": "Allow","priority": 120,"direction": "Inbound","sourcePortRanges": [],"destinationPortRanges": [],"sourceAddressPrefixes": [],"destinationAddressPrefixes": []}},{"name": "Port_Https","properties": {"protocol": "TCP","sourcePortRange": "*","destinationPortRange": "443","sourceAddressPrefix": "*","destinationAddressPrefix": "*","access": "Allow","priority": 130,"direction": "Inbound","sourcePortRanges": [],"destinationPortRanges": [],"sourceAddressPrefixes": [],"destinationAddressPrefixes": []}}]}},{"type": "Microsoft.Network/virtualNetworks","apiVersion": "2019-11-01","name": "[parameters('virtualNetworkName')]","location": "[parameters('location')]","dependsOn": ["[resourceId('Microsoft.Network/networkSecurityGroups/', variables('networkSecurityGroupName'))]"],"properties": {"addressSpace": {"addressPrefixes": ["10.211.0.0/16"]},"subnets": [{"name": "[parameters('vmssSubnetName')]","properties": {"networkSecurityGroup": {"id": "[resourceId('Microsoft.Network/networkSecurityGroups', variables('networkSecurityGroupName'))]"},"addressPrefix": "10.211.0.0/24"}},{"name": "[parameters('subnetName')]","properties": {"networkSecurityGroup": {"id": "[resourceId('Microsoft.Network/networkSecurityGroups', variables('networkSecurityGroupName'))]"},"addressPrefix": "10.211.1.0/24"}}]}},{"type": "Microsoft.Network/networkInterfaces","apiVersion": "2019-11-01","name": "[concat(variables('networkInterfaceName'), copyindex())]","location": "[parameters('location')]","dependsOn": ["[resourceId('Microsoft.Network/virtualNetworks/', parameters('virtualNetworkName'))]","[resourceId('Microsoft.Network/loadBalancers/', parameters('publicLBName'))]"],"properties": {"ipConfigurations": [{"name": "ipconfig1","properties": {"subnet": {"id": "[variables('subnetRef')]"},"loadBalancerBackendAddressPools": [{"id": "[concat(variables('publicLBID'), '/backendAddressPools/BackendPoolMaster')]"}],"loadBalancerInboundNatRules": [{"id": "[concat(variables('publicLBID'), '/inboundNatRules/lbNAT-master',copyindex())]"}],"privateIPAllocationMethod": "Dynamic"}}]},"copy": {"name": "nicLoop","count": "[parameters('defaultMasterCount')]"}},{"type": "Microsoft.Network/publicIPAddresses","apiVersion": "2019-09-01","name": "[variables('publicIPAddressName')]","location": "[parameters('location')]","sku": {"name": "Standard"},"properties": {"publicIPAllocationMethod": "Static","publicIPAddressVersion": "IPv4","dnsSettings": {"domainNameLabel": "[parameters('dnsLabelPrefix')]"},"idleTimeoutInMinutes": 10}},{"type": "Microsoft.Network/loadBalancers","apiVersion": "2018-06-01","name": "[parameters('publicLBName')]","location": "[parameters('location')]","dependsOn": ["[concat('Microsoft.Network/publicIPAddresses/', variables('publicIPAddressName'))]"],"sku": {"name": "Standard"},"properties": {"frontendIPConfigurations": [{"name": "LoadBalancerFrontEnd","properties": {"publicIPAddress": {"id": "[resourceId('Microsoft.Network/publicIPAddresses',variables('publicIPAddressName'))]"}}}],"backendAddressPools": [{"name": "BackendPoolNode"},{"name": "BackendPoolMaster"}],"loadBalancingRules": [{"name": "HttpLBRule","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"backendAddressPool": {"id": "[concat(variables('publicLBID'),'/backendAddressPools/BackendPoolNode')]"},"protocol": "Tcp","frontendPort": 80,"backendPort": 80,"enableFloatingIP": false,"disableOutboundSnat": false,"idleTimeoutInMinutes": 5,"probe": {"id": "[concat(variables('publicLBID'),'/probes/tcpProbe')]"}}},{"name": "APILBRule","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"backendAddressPool": {"id": "[concat(variables('publicLBID'),'/backendAddressPools/BackendPoolMaster')]"},"protocol": "Tcp","frontendPort": 6443,"backendPort": 6443,"enableFloatingIP": false,"disableOutboundSnat": false,"idleTimeoutInMinutes": 5,"probe": {"id": "[concat(variables('publicLBID'),'/probes/apitcpProbe')]"}}}],"probes": [{"name": "tcpProbe","properties": {"protocol": "Tcp","port": 80,"intervalInSeconds": 5,"numberOfProbes": 2}},{"name": "apitcpProbe","properties": {"protocol": "Tcp","port": 6443,"intervalInSeconds": 5,"numberOfProbes": 2}}],"inboundNatRules": [{"name": "lbNAT-master0","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"protocol": "Tcp","frontendPort": "50200","backendPort": "22"}},{"name": "lbNAT-master1","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"protocol": "Tcp","frontendPort": "50201","backendPort": "22"}},{"name": "lbNAT-master2","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"protocol": "Tcp","frontendPort": "50202","backendPort": "22"}}],"inboundNatPools": [{"name": "lbNAT-node","properties": {"frontendIPConfiguration": {"id": "[concat(variables('publicLBID'),'/frontendIPConfigurations/LoadBalancerFrontEnd')]"},"protocol": "Tcp","frontendPortRangeStart": 50100,"frontendPortRangeEnd": 50199,"backendPort": 22}}]}},{"type": "Microsoft.Compute/availabilitySets","apiVersion": "2016-04-30-preview","name": "[variables('availabilitySetName')]","location": "[parameters('location')]","properties": {"platformFaultDomainCount": 2,"platformUpdateDomainCount": 2,"managed": true}},{"type": "Microsoft.Compute/virtualMachines","apiVersion": "2019-07-01","name": "[concat(parameters('vmNamePrefix'), copyindex())]","location": "[parameters('location')]","dependsOn": ["[concat('Microsoft.Network/networkInterfaces/', variables('networkInterfaceName'), copyindex())]","[concat('Microsoft.Compute/availabilitySets/', variables('availabilitySetName'))]","[concat('Microsoft.Compute/virtualMachineScaleSets/', parameters('vmssName'))]"],"properties": {"availabilitySet": {"id": "[resourceId('Microsoft.Compute/availabilitySets',variables('availabilitySetName'))]"},"hardwareProfile": {"vmSize": "[parameters('vmSize')]"},"storageProfile": {"osDisk": {"createOption": "FromImage","managedDisk": {"storageAccountType": "[variables('osDiskType')]"}},"imageReference": {"publisher": "Canonical","offer": "0001-com-ubuntu-server-focal","sku": "20_04-lts-gen2","version": "latest"}},"networkProfile": {"networkInterfaces": [{"id": "[resourceId('Microsoft.Network/networkInterfaces',concat(variables('networkInterfaceName'),copyindex()))]"}]},"osProfile": {"computerName": "[concat(parameters('vmNamePrefix'), copyindex())]","adminUsername": "[parameters('adminUsername')]","adminPassword": "[parameters('adminKey')]","linuxConfiguration": {"disablePasswordAuthentication": true,"ssh": {"publicKeys": [{"path": "[concat('/home/', parameters('adminUsername'), '/.ssh/authorized_keys')]","keyData": "[parameters('adminKey')]"}]}}}},"copy": {"name": "virtualMachineLoop","count": "[parameters('defaultMasterCount')]"}},{"type": "Microsoft.Compute/virtualMachineScaleSets","apiVersion": "2019-07-01","name": "[parameters('vmssName')]","location": "[parameters('location')]","dependsOn": ["[concat('Microsoft.Network/virtualNetworks/', parameters('virtualNetworkName'))]","[concat('Microsoft.Network/loadBalancers/', parameters('publicLBName'))]"],"tags": {"cluster-autoscaler-enabled": "true","cluster-autoscaler-name": "[resourceGroup().name]","min": "[parameters('minNodeCount')]","max": "[parameters('maxNodeCount')]","poolName": "[parameters('vmssName')]"},"sku": {"name": "[parameters('vmSize')]","tier": "Standard","capacity": "[parameters('defaultNodeCount')]"},"properties": {"overprovision": false,"upgradePolicy": {"mode": "Manual"},"virtualMachineProfile": {"storageProfile": {"osDisk": {"createOption": "FromImage","caching": "ReadWrite"},"imageReference": {"publisher": "Canonical","offer": "0001-com-ubuntu-server-focal","sku": "20_04-lts-gen2","version": "latest"}},"osProfile": {"computerNamePrefix": "[parameters('vmssName')]","adminUsername": "[parameters('adminUsername')]","adminPassword": "[parameters('adminKey')]","linuxConfiguration": {"disablePasswordAuthentication": true,"ssh": {"publicKeys": [{"path": "[concat('/home/', parameters('adminUsername'), '/.ssh/authorized_keys')]","keyData": "[parameters('adminKey')]"}]}}},"networkProfile": {"networkInterfaceConfigurations": [{"name": "[concat(parameters('vmssName'),'nic')]","properties": {"primary": true,"ipConfigurations": [{"name": "[concat('ipconfigVmss', parameters('vmssName'))]","properties": {"subnet": {"id": "[variables('vmssSubnetRef')]"},"loadBalancerBackendAddressPools": [{"id": "[concat(variables('publicLBID'), '/backendAddressPools/BackendPoolNode')]"}],"loadBalancerInboundNatPools": [{"id": "[concat(variables('publicLBID'), '/inboundNatPools/lbNAT-node')]"}]}}]}}]}}}}],"outputs": {"adminUsername": {"type": "String","value": "[parameters('adminUsername')]"},"hostname": {"type": "String","value": "[reference(variables('publicIPAddressName')).dnsSettings.fqdn]"},"sshCommand": {"type": "String","value": "[concat('ssh ', parameters('adminUsername'), '@', reference(variables('publicIPAddressName')).dnsSettings.fqdn)]"}}
    }
    
    • 可以修改 master 和 node 的名字前缀、部署区域、数量和 VM 类型

      在这里插入图片描述

      • ssh 22 对外由 LB 配置 NAT 端口实现,如配置文件中 50200 → master-0
        • 已经包含的规则转换(不含 30880)

          服务协议规则后端端口前端端口节点池
          sshTCP入站 NAT2250200, 50201, 50202, 50100~50199主节点, 普通节点
          api 服务器TCP负载均衡64436443主节点
          ks 控制台TCP负载均衡3088030880主节点
          httpTCP负载均衡8080普通节点
          httpsTCP负载均衡443443普通节点
      • node 使用 VMSS
  • 部署 K8S cluster
    最简单的方式还是用 kk 完成,注意在 kubernetes 1.24 以后,psp 弃用,在 kk 中还有 psp 权限管理,安装的时候会报错。建议使用 1.23.10,也是 kk 现在默认的版本。

    • 证书传输 → Master-0

      scp  -i zyi.pem -P 50200 zyi.pem zyi@20.247.0.170:/home/zyi/.ssh/
    • 每一台安装 socat 等必须的软件

      ssh -i zyi.pem -p50200 zyi@20.247.0.170 'sudo apt install socat conntrack'
      
    • 登录到 Mater-0

      ssh -i zyi.pem -p50200 zyi@20.247.0.170
      
    • 下载 kk 并赋予可执行权限

    curl -sfL https://get-kk.kubesphere.io | VERSION=v3.0.10 sh -chmod +x kk
    
    • 创建配置文件模板

      ./kk create config --with-kubesphere v3.3.2 --with-kubernetes v1.22.12
      
      • KubeSphere 3.3 对应 Kubernetes 版本推荐:v1.20.x、v1.21.x、* v1.22.x、* v1.23.x 和 * v1.24.x。带星号的版本可能出现边缘节点部分功能不可用的情况。因此,如需使用边缘节点,推荐安装 v1.21.x。如果未指定 Kubernetes 版本,KubeKey 将默认安装 Kubernetes v1.23.10。有关支持的 Kubernetes 版本请参阅支持矩阵。

      • 如果在此步骤中的命令中未添加标志 -with-kubesphere,则不会部署 KubeSphere,除非您使用配置文件中的 addons 字段进行安装,或稍后使用 ./kk create cluster 时再次添加此标志。

      • 如果在未指定 KubeSphere 版本的情况下添加标志 --with kubesphere`,将安装 KubeSphere 的最新版本。

      • 修改的内容用红色标注

        apiVersion: kubekey.kubesphere.io/v1alpha2
        kind: Cluster
        metadata:name: kubeCluster
        spec:hosts:- {name: master-0, address: 20.210.0.156, port: 50200, internalAddress: 10.211.1.5, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}- {name: master-1, address: 20.210.0.156, port: 50201, internalAddress: 10.211.1.6, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}- {name: master-2, address: 20.210.0.156, port: 50202, internalAddress: 10.211.1.4, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}- {name: node000000, address: 20.210.0.156, port: 50100, internalAddress: 10.211.0.4, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}- {name: node000001, address: 20.210.0.156, port: 50101, internalAddress: 10.211.0.5, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}- {name: node000002, address: 20.210.0.156, port: 50102, internalAddress: 10.211.0.6, user: zyi, privateKeyPath: "~/.ssh/zyi.pem"}roleGroups:etcd:- master-0- master-1- master-2control-plane:- master-0- master-1- master-2worker:- node000000- node000001- node000002controlPlaneEndpoint:## Internal loadbalancer for apiservers# internalLoadbalancer: haproxydomain: lb.etaon.labaddress: "20.210.0.156"port: 6443kubernetes:version: v1.23.10clusterName: cluster.localautoRenewCerts: truecontainerManager: dockeretcd:type: kubekeynetwork:plugin: flannelkubePodsCIDR: 10.233.64.0/18kubeServiceCIDR: 10.233.0.0/18## multus support. https://github.com/k8snetworkplumbingwg/multus-cnimultusCNI:enabled: falseregistry:privateRegistry: ""namespaceOverride: ""registryMirrors: []insecureRegistries: []addons: []---
        apiVersion: installer.kubesphere.io/v1alpha1
        kind: ClusterConfiguration
        metadata:name: ks-installernamespace: kubesphere-systemlabels:version: v3.3.2
        spec:persistence:storageClass: ""authentication:jwtSecret: ""zone: ""local_registry: ""namespace_override: ""# dev_tag: ""etcd:monitoring: falseendpointIps: localhostport: 2379tlsEnable: truecommon:core:console:enableMultiLogin: trueport: 30880type: NodePort# apiserver:#  resources: {}# controllerManager:#  resources: {}redis:enabled: falsevolumeSize: 2Giopenldap:enabled: falsevolumeSize: 2Giminio:volumeSize: 20Gimonitoring:# type: externalendpoint: http://prometheus-operated.kubesphere-monitoring-system.svc:9090GPUMonitoring:enabled: falsegpu:kinds:- resourceName: "nvidia.com/gpu"resourceType: "GPU"default: truees:# master:#   volumeSize: 4Gi#   replicas: 1#   resources: {}# data:#   volumeSize: 20Gi#   replicas: 1#   resources: {}logMaxAge: 7elkPrefix: logstashbasicAuth:enabled: falseusername: ""password: ""externalElasticsearchHost: ""externalElasticsearchPort: ""alerting:enabled: false# thanosruler:#   replicas: 1#   resources: {}auditing:enabled: false# operator:#   resources: {}# webhook:#   resources: {}devops:enabled: false# resources: {}jenkinsMemoryLim: 8GijenkinsMemoryReq: 4GijenkinsVolumeSize: 8Gievents:enabled: false# operator:#   resources: {}# exporter:#   resources: {}# ruler:#   enabled: true#   replicas: 2#   resources: {}logging:enabled: falselogsidecar:enabled: truereplicas: 2# resources: {}metrics_server:enabled: falsemonitoring:storageClass: ""node_exporter:port: 9100# resources: {}# kube_rbac_proxy:#   resources: {}# kube_state_metrics:#   resources: {}# prometheus:#   replicas: 1#   volumeSize: 20Gi#   resources: {}#   operator:#     resources: {}# alertmanager:#   replicas: 1#   resources: {}# notification_manager:#   resources: {}#   operator:#     resources: {}#   proxy:#     resources: {}gpu:nvidia_dcgm_exporter:enabled: false# resources: {}multicluster:clusterRole: nonenetwork:networkpolicy:enabled: falseippool:type: nonetopology:type: noneopenpitrix:store:enabled: falseservicemesh:enabled: falseistio:components:ingressGateways:- name: istio-ingressgatewayenabled: falsecni:enabled: falseedgeruntime:enabled: falsekubeedge:enabled: falsecloudCore:cloudHub:advertiseAddress:- ""service:cloudhubNodePort: "30000"cloudhubQuicNodePort: "30001"cloudhubHttpsNodePort: "30002"cloudstreamNodePort: "30003"tunnelNodePort: "30004"# resources: {}# hostNetWork: falseiptables-manager:enabled: truemode: "external"# resources: {}# edgeService:#   resources: {}terminal:timeout: 600
        
    • 安装部署

      ./kk create cluster -f config-sample.yaml
      
      • 安装日志
      kubectl logs -n kubesphere-system $(kubectl get pod -n kubesphere-system -l 'app in (ks-install, ks-installer)' -o jsonpath='{.items[0].metadata.name}') -f
      
      #####################################################
      ###              Welcome to KubeSphere!           ###
      #####################################################Console: http://10.211.1.5:30880
      Account: admin
      Password: P@88w0rd
      NOTES:1. After you log into the console, please check themonitoring status of service components in"Cluster Management". If any service is notready, please wait patiently until all components are up and running.2. Please change the default password after login.#####################################################
      https://kubesphere.io             2023-08-11 03:31:56
      #####################################################
      
    • 在 LBer 上为 30880端口 配置规则并在 ASG 上 permit

      在这里插入图片描述

      在这里插入图片描述

    • http://hostip:30880

      在这里插入图片描述

  • 测试

    apiVersion: v1
    kind: Service
    metadata:name: hello-kubernetes
    spec:type: NodePortports:- port: 80targetPort: 8080selector:app: hello-kubernetes
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:name: hello-kubernetes
    spec:replicas: 3selector:matchLabels:app: hello-kubernetestemplate:metadata:labels:app: hello-kubernetesspec:containers:- name: hello-kubernetesimage: paulbouwer/hello-kubernetes:1.5ports:- containerPort: 8080env:- name: MESSAGEvalue: I just deployed a PodVM on the Azure VM Cluster!!
    
    • 配置外部访问30596 → 80

      kubectl get svc
      NAME               TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
      hello-kubernetes   NodePort    10.233.31.158   <none>        80:30596/TCP   167m
      
    • 负载均衡上配置

      在这里插入图片描述

    • 访问前端 公网 IP 或 DNS 名称

      在这里插入图片描述

      在这里插入图片描述

相关文章:

K8S cluster with multi-masters on Azure VM

拓扑参考&#xff1a; 在 Azure VM 实例上部署 KubeSphere 基础模板 需要修改 IP 地址和 VM Image的可以在模板中修改。 {"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#","contentVersion": &q…...

初阶c语言:趣味扫雷游戏

目录 前言 制作菜单 构建游戏选择框架 实现游戏功能 模块化编程&#xff1a;查看前节三子棋的内容 初始化雷区 ​编辑 优化棋盘 随机埋入地雷 点击后的决策 实现此功能代码 game&#xff08;&#xff09;&#xff1b;的安排 前言 《扫雷》是一款大众类的益智小游戏&…...

JVM——内存模型

1.java内存模型 1.1 原子性 1.2 问题分析 这里与局部变量自增不同&#xff0c;局部变量调用iinc是在局部变量表槽位上进行自增。 静态变量是在操作数栈自增。 这里的主内存和工作内存时再JMM里的说法。 因为操作系统是时间片切换的多个线程轮流使用CPU. 1.3解决方法 JMM中…...

java八股文面试[JVM]——元空间

JAVA8为什么要增加元空间 为什么要移除永久代&#xff1f; 知识来源&#xff1a; 【2023年面试】JVM8为什么要增加元空间_哔哩哔哩_bilibili...

科技云报道:云计算下半场,公有云市场生变,私有云风景独好

科技云报道原创。 大数据、云计算、人工智能&#xff0c;组成了恢弘的万亿级科技市场。这三个领域&#xff0c;无论远观近观&#xff0c;都如此性感和魅力&#xff0c;让一代又一代创业者为之杀伐攻略。 然而高手过招往往一瞬之间便已胜负知晓&#xff0c;云计算市场的巨幕甫…...

Oracle 如何给大表添加带有默认值的字段

一、讲故事 你是否遇到过开发人员添加字段&#xff0c;导致数据库锁表问题&#xff1f; 但是令开发疑惑的事&#xff0c;他们添加字段&#xff0c;有的时候很快&#xff0c;有的时候很慢&#xff1f; 为什么呢&#xff1f; 询问得知&#xff0c;**加的慢时候是带上了default默…...

记录Taro大坑2丢失api无法启动

现象 解决方案 看了很多。很多说要改成一致的版本号。其实没什么用。 正确方案 再新建一个模板跑起来对比config的配置&#xff0c;以及package.json发现关闭预编译即可。预编译导致api丢失...

Java-Maven-解决maven deploy时报 401 Reason Phrase Unauthorized 错误

Java-Maven-解决maven deploy时报 401 Reason Phrase Unauthorized 错误 环境 Java JDK 1.8Maven 3.3.9 引言 项目需要打成jar包上传到私服&#xff0c;供其它项目引用。此时需要执行 mvn clean deploy 命令&#xff0c;执行过程中报 401 错误。 解决401错误 报错信息 执…...

【数据结构】 栈(Stack)的应用场景

文章目录 &#x1f30f;前言&#x1f340;改变元素的序列&#x1f6a9;场景一&#x1f4cc;解析&#xff1a; &#x1f6a9;场景二&#x1f4cc;解析&#xff1a; &#x1f38d;将递归转化为循环&#x1f333;[括号匹配](https://leetcode.cn/problems/valid-parentheses/)&…...

人力资源小程序的设计原则与实现方法

随着移动互联网的快速发展&#xff0c;小程序成为了各行各业推广和服务的新利器。对于人力资源行业来说&#xff0c;开发一款定制化的小程序不仅可以提升服务效率&#xff0c;还可以增强品牌形象和用户粘性。那么&#xff0c;如何定制开发人力资源类的小程序呢&#xff1f;下面…...

检查Javascript对象数组中是否存在对象值,如果没有向数组添加新对象

需求&#xff1a; 如果我有以下对象数组&#xff1a; [ { id: 1, username: fred }, { id: 2, username: bill }, { id: 2, username: ted } ]有没有办法循环遍历数组&#xff0c;以检查特定的用户名值是否已经存在&#xff0c;如果它什么都不做&#xff0c;但是如果它没有用…...

UG\NX二次开发 使用录制功能录制操作记录时,如何设置默认的开发语言?

文章作者&#xff1a;里海 来源网站&#xff1a;王牌飞行员_里海_里海NX二次开发3000例,C\C,Qt-CSDN博客 简介&#xff1a; NX二次开发使用BlockUI设计对话框时&#xff0c;如何设置默认的代码语言&#xff1f; 效果&#xff1a; 方法&#xff1a; 依次打开“文件”->“实用…...

【业务功能篇83】微服务SpringCloud-ElasticSearch-Kibanan-docke安装-应用层实战

五、ElasticSearch应用 1.ES 的Java API两种方式 Elasticsearch 的API 分为 REST Client API&#xff08;http请求形式&#xff09;以及 transportClient API两种。相比来说transportClient API效率更高&#xff0c;transportClient 是通过Elasticsearch内部RPC的形式进行请求…...

VBJSON报错:缺少:语句结束

项目中使用JSON库VBJSON时报错&#xff1a; 编译错误&#xff1a;缺少&#xff1a;语句结束 cJSONScript和cStringBuilder报相同的错误&#xff0c;都在第一行: VERSION 1.0 CLASS 研究了半天没啥结果&#xff0c;之前使用这个库的时候没有什么问题&#xff0c;所以判定是当前…...

Docker安装ES+kibana8.9.1

参考&#xff1a;基于Docker安装Elasticsearch【保姆级教程、内含图解】_docker elasticsearch_Acloasia的博客-CSDN博客 创建网络 docker network create es-net 基于Docker安装Elasticsearch 拉取镜像 docker pull elasticsearch:8.9.1 挂载文件 mkdir -p /usr/local/e…...

12. Oracle中case when详解

格式&#xff1a; case expression when condition_01 then result_01 when condition_02 then result_02 ...... when condition_n then result_n else result_default end 表达式expression符合条件condition_01&#xff0c;则返回…...

【电路设计】220V AC转低压DC电路概述

前言 最近因项目需要,电路板上要加上一个交流220V转低压直流,比如12V或者5V这种。一般来说,比较常见也比较简单的做法是使用一个变压器将220V AC进行降压,比如降到22V AC,但是很遗憾的是,支持220V的变压器一般体积很大,而板子留给电源部分的面积又非常有限,所以不得不研…...

网络地址转换NAT-动态NAT的使用范围和配置-思科EI,华为数通

网络地址转换NAT-动态NAT的使用范围和配置 什么是动态NAT&#xff1f; 使用公有地址池&#xff0c;并以先到先得的原则分配这些地址。当具有私有 IP 地址的主机请求访问 Internet 时&#xff0c;动态 NAT 从地址池中选择一个未被其它主机占用的 IP 地址一对一的转化。当数据会话…...

远程连接虚拟机中ubuntu报错:Network error:Connection refused

ping检测一下虚拟机 可以ping通&#xff0c;说明主机是没问题 #检查ssh是否安装&#xff1a; ps -e |grep ssh发现ssh没有安装 #安装openssh-server sudo apt-get install openssh-server#启动ssh service ssh startps -e |grep ssh检查一下防火墙 #防火墙状态查看 sudo ufw…...

快速排序三种思路详解!

一、快速排序的介绍 快速排序是Hoare于1962年提出的一种二叉树结构的交换排序方法&#xff0c;其基本思想为&#xff1a;任取待排序元素序列中 的某元素作为基准值&#xff0c;按照该排序码将待排序集合分割成两子序列&#xff0c;左子序列中所有元素均小于基准值&#xff0c;…...

Vim 调用外部命令学习笔记

Vim 外部命令集成完全指南 文章目录 Vim 外部命令集成完全指南核心概念理解命令语法解析语法对比 常用外部命令详解文本排序与去重文本筛选与搜索高级 grep 搜索技巧文本替换与编辑字符处理高级文本处理编程语言处理其他实用命令 范围操作示例指定行范围处理复合命令示例 实用技…...

树莓派超全系列教程文档--(62)使用rpicam-app通过网络流式传输视频

使用rpicam-app通过网络流式传输视频 使用 rpicam-app 通过网络流式传输视频UDPTCPRTSPlibavGStreamerRTPlibcamerasrc GStreamer 元素 文章来源&#xff1a; http://raspberry.dns8844.cn/documentation 原文网址 使用 rpicam-app 通过网络流式传输视频 本节介绍来自 rpica…...

【入坑系列】TiDB 强制索引在不同库下不生效问题

文章目录 背景SQL 优化情况线上SQL运行情况分析怀疑1:执行计划绑定问题?尝试:SHOW WARNINGS 查看警告探索 TiDB 的 USE_INDEX 写法Hint 不生效问题排查解决参考背景 项目中使用 TiDB 数据库,并对 SQL 进行优化了,添加了强制索引。 UAT 环境已经生效,但 PROD 环境强制索…...

mongodb源码分析session执行handleRequest命令find过程

mongo/transport/service_state_machine.cpp已经分析startSession创建ASIOSession过程&#xff0c;并且验证connection是否超过限制ASIOSession和connection是循环接受客户端命令&#xff0c;把数据流转换成Message&#xff0c;状态转变流程是&#xff1a;State::Created 》 St…...

Swift 协议扩展精进之路:解决 CoreData 托管实体子类的类型不匹配问题(下)

概述 在 Swift 开发语言中&#xff0c;各位秃头小码农们可以充分利用语法本身所带来的便利去劈荆斩棘。我们还可以恣意利用泛型、协议关联类型和协议扩展来进一步简化和优化我们复杂的代码需求。 不过&#xff0c;在涉及到多个子类派生于基类进行多态模拟的场景下&#xff0c;…...

渗透实战PortSwigger靶场-XSS Lab 14:大多数标签和属性被阻止

<script>标签被拦截 我们需要把全部可用的 tag 和 event 进行暴力破解 XSS cheat sheet&#xff1a; https://portswigger.net/web-security/cross-site-scripting/cheat-sheet 通过爆破发现body可以用 再把全部 events 放进去爆破 这些 event 全部可用 <body onres…...

Spring Boot面试题精选汇总

&#x1f91f;致敬读者 &#x1f7e9;感谢阅读&#x1f7e6;笑口常开&#x1f7ea;生日快乐⬛早点睡觉 &#x1f4d8;博主相关 &#x1f7e7;博主信息&#x1f7e8;博客首页&#x1f7eb;专栏推荐&#x1f7e5;活动信息 文章目录 Spring Boot面试题精选汇总⚙️ **一、核心概…...

select、poll、epoll 与 Reactor 模式

在高并发网络编程领域&#xff0c;高效处理大量连接和 I/O 事件是系统性能的关键。select、poll、epoll 作为 I/O 多路复用技术的代表&#xff0c;以及基于它们实现的 Reactor 模式&#xff0c;为开发者提供了强大的工具。本文将深入探讨这些技术的底层原理、优缺点。​ 一、I…...

Angular微前端架构:Module Federation + ngx-build-plus (Webpack)

以下是一个完整的 Angular 微前端示例&#xff0c;其中使用的是 Module Federation 和 npx-build-plus 实现了主应用&#xff08;Shell&#xff09;与子应用&#xff08;Remote&#xff09;的集成。 &#x1f6e0;️ 项目结构 angular-mf/ ├── shell-app/ # 主应用&…...

【VLNs篇】07:NavRL—在动态环境中学习安全飞行

项目内容论文标题NavRL: 在动态环境中学习安全飞行 (NavRL: Learning Safe Flight in Dynamic Environments)核心问题解决无人机在包含静态和动态障碍物的复杂环境中进行安全、高效自主导航的挑战&#xff0c;克服传统方法和现有强化学习方法的局限性。核心算法基于近端策略优化…...