1. The background of HashMap In this part, we first introduce hash tables and hashes from the advantages and disadvantages of arrays and linked lists. Take a look at the characteristics of hash tables and hashes compared to the first two. 1.1 Advantages and disadvantages of arrays First look at the memory structure diagram of the array. Looking at this picture, you should clearly see the characteristics, advantages and disadvantages of the array.

***The following content is for reference only and does not involve any investment. For specific content, please refer to the official government release! ! ! *** 1. Types of housing in Singapore Housing in Singapore is divided into HDB flats planned and built by the government, executive condominiums, and private commercial housing. Among them, private commercial housing is divided into landed housing and non-landed housing (ie apartments). HDB (House&Development Board)-built HDB flats and executive condominiums are all 99-year leasehold**, private residences are built by private real estate developers with 99-year, 999-year and permanent leaseholds difference.

1. Certified Kubernetes Administrator 2. The Exam Info 3. Certification Verification Tool You can access this link to verify the certification. Certification Verification Tool

We know that the core of Docker is resource isolation. Docker is equivalent to a process running on the Host, but how do these processes run independently without interfering with each other? This is about Docker’s CGroup and Namespace. The full name of CGroup is Control Group, which is used to set the limit of CPU, memory and IO resources used by the process. So CGroup is equivalent to resource control.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 #查看所有namespace的pods运行情况 kubectl get pods --all-namespaces #查看具体pods，记得后边跟namespace名字哦 kubectl get pods kubernetes-dashboard-76479d66bb-nj8wr --namespace=kube-system # 查看pods具体信息 kubectl get pods -o wide kubernetes-dashboard-76479d66bb-nj8wr --namespace=kube-system # 查看集群健康状态 kubectl get cs # 获取所有deployment kubectl get deployment --all-namespaces # 列出该 namespace 中的所有 pod 包括未初始化的 kubectl get pods --include-uninitialized # 查看deployment() kubectl get deployment nginx-app # 查看rc和servers kubectl get rc,services # 查看pods结构信息（重点，通过这个看日志分析错误） # 对控制器和服务，node同样有效 kubectl describe pods xxxxpodsname --namespace=xxxnamespace # 其他控制器类似吧，就是kubectl get 控制器 控制器具体名称 # 查看pod日志 kubectl logs $POD_NAME # 查看pod变量 kubectl exec my-nginx-5j8ok -- printenv | grep SERVICE # 集群 kubectl get cs # 集群健康情况 kubectl cluster-info # 集群核心组件运行情况 kubectl get namespaces # 表空间名 kubectl version # 版本 kubectl api-versions # API kubectl get events # 查看事件 kubectl get nodes //获取全部节点 kubectl delete node k8s2 //删除节点 kubectl rollout status deploy nginx-test # 创建 kubectl create -f .

1. Test center distribution CKA: Certified Kubernetes Administrator. CNCF: Cloud Native Computing Foundation. Knowledge point division： 5%: scheduling 5%: Logging/Monitoring 8%: Application Lifecycle Management 11%: Cluster 12%: Security 7%: Storage 10%: Troubleshooting 19%:Core Concepts 11%:Networking s12%:Installation, Configuration & Validation