云原生|kubernetes|kubeadm部署高可用集群(一)使用外部etcd集群(二)

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简介: 云原生|kubernetes|kubeadm部署高可用集群(一)使用外部etcd集群

完整的初始化清单文件:

[root@master ~]# cat kubeadm-init.yaml 
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: "0"
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.217.19
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  imagePullPolicy: IfNotPresent
  name: master
  taints: null
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns: {}
etcd:
  external:
    endpoints:     #下面为自定义etcd集群地址
    - https://192.168.217.19:2379
    - https://192.168.217.20:2379
    - https://192.168.217.21:2379
    caFile: /etc/kubernetes/pki/etcd/ca.pem
    certFile: /etc/kubernetes/pki/etcd/apiserver-etcd-client.pem
    keyFile: /etc/kubernetes/pki/etcd/apiserver-etcd-client-key.pem
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.22.2
networking:
  dnsDomain: cluster.local
  podSubnet: "10.244.0.0/16"
  serviceSubnet: "10.96.0.0/12"
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
bindAddressHardFail: false
clientConnection:
  acceptContentTypes: ""
  burst: 0
  contentType: ""
  kubeconfig: /var/lib/kube-proxy/kubeconfig.conf
  qps: 0
clusterCIDR: "10.244.0.0/16"
configSyncPeriod: 0s
conntrack:
  maxPerCore: null
  min: null
  tcpCloseWaitTimeout: null
  tcpEstablishedTimeout: null
detectLocalMode: ""
enableProfiling: false
healthzBindAddress: ""
hostnameOverride: "k8s-master"
iptables:
  masqueradeAll: false
  masqueradeBit: null
  minSyncPeriod: 0s
  syncPeriod: 0s
ipvs:
  excludeCIDRs: null
  minSyncPeriod: 0s
  scheduler: ""
  strictARP: false
  syncPeriod: 0s
  tcpFinTimeout: 0s
  tcpTimeout: 0s
  udpTimeout: 0s
kind: KubeProxyConfiguration
metricsBindAddress: ""
mode: ""
nodePortAddresses: null
oomScoreAdj: null
portRange: ""
showHiddenMetricsForVersion: ""
udpIdleTimeout: 0s
winkernel:
  enableDSR: false
  networkName: ""
  sourceVip: ""
---
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 0s
    cacheUnauthorizedTTL: 0s
cgroupDriver: systemd
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
cpuManagerReconcilePeriod: 0s
evictionPressureTransitionPeriod: 0s
fileCheckFrequency: 0s
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 0s
imageMinimumGCAge: 0s
kind: KubeletConfiguration
logging: {}
memorySwap: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 0s
rotateCertificates: true
runtimeRequestTimeout: 0s
shutdownGracePeriod: 0s
shutdownGracePeriodCriticalPods: 0s
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s

外部etcd集群的证书处理:

 (建立目录在三个节点都执行,在master节点拷贝好文件后,scp到工作节点20和21)
mkdir -p /etc/kubernetes/pki/etcd/ 
cp /opt/etcd/ssl/ca.pem /etc/kubernetes/pki/etcd/
cp /opt/etcd/ssl/server.pem  /etc/kubernetes/pki/etcd/apiserver-etcd-client.pem
cp /opt/etcd/ssl/server-key.pem  /etc/kubernetes/pki/etcd/apiserver-etcd-client-key.pem
scp /etc/kubernetes/pki/etcd/*  node1:/etc/kubernetes/pki/etcd/
scp /etc/kubernetes/pki/etcd/*  node2:/etc/kubernetes/pki/etcd/

使用config清单文件:

kubeadm init --config=kubeadm-init.yaml

此命令的输出如下:

其中的这些输出表示已经启用了外部etcd集群,按官方来说,就是External etcd mode (扩展etcd模式),因此,etcd相关证书不生成,Skipping了嘛。

[certs] External etcd mode: Skipping etcd/ca certificate authority generation

[certs] External etcd mode: Skipping etcd/server certificate generation

[certs] External etcd mode: Skipping etcd/peer certificate generation

[certs] External etcd mode: Skipping etcd/healthcheck-client certificate generation

[certs] External etcd mode: Skipping apiserver-etcd-client certificate generation

这个是kubelet环境变量配置,方便使用kubectl命令的

mkdir -p $HOME/.kube
 sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
 sudo chown $(id -u):$(id -g) $HOME/.kube/config

工作节点加入集群的命令,此命令复制后,在工作节点执行即可将工作节点加入集群:

kubeadm join 192.168.217.19:6443 --token abcdef.0123456789abcdef \
  --discovery-token-ca-cert-hash sha256:8245100f694c48a3171fd473fc2b9a1c6696394c89ff4ac902d4fde95c4740f1

两个网络相关插件coreDNS和kube-proxy以静态pod的方式部署在集群内了:

[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
[init] Using Kubernetes version: v1.22.2
[preflight] Running pre-flight checks
  [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master] and IPs [10.96.0.1 192.168.217.19]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] External etcd mode: Skipping etcd/ca certificate authority generation
[certs] External etcd mode: Skipping etcd/server certificate generation
[certs] External etcd mode: Skipping etcd/peer certificate generation
[certs] External etcd mode: Skipping etcd/healthcheck-client certificate generation
[certs] External etcd mode: Skipping apiserver-etcd-client certificate generation
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 16.008300 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.22" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node master as control-plane by adding the labels: [node-role.kubernetes.io/master(deprecated) node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node master as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: abcdef.0123456789abcdef
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
  export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.217.19:6443 --token abcdef.0123456789abcdef \
  --discovery-token-ca-cert-hash sha256:8245100f694c48a3171fd473fc2b9a1c6696394c89ff4ac902d4fde95c4740f1 

四,工作节点加入(在20和21服务器上都执行)


root@node1 ~]# kubeadm join 192.168.217.19:6443 --token abcdef.0123456789abcdef --discovery-token-ca-cert-hash sha256:8245100f694c48a3171fd473fc2b9a1c6696394c89ff4ac902d4fde95c4740f1
[preflight] Running pre-flight checks
  [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

两个服务器都执行完毕后,就可以使用kubectl 查看节点和pod了,只是节点状态会是notready,需要安装网络插件比如,flannel或者calico,weave,canal等等任意一种即可。

五,功能测试


网络插件的安装部署本文就省略了,因为本文主要就是讲述如何使用扩展etcd外部集群。假设正确安装了flannel。现查看集群的整体状态:

可以看到外部etcd集群可以在集群内看到:

[root@master bin]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS      MESSAGE                                                                                       ERROR
scheduler            Unhealthy   Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused   
controller-manager   Healthy     ok                                                                                            
etcd-1               Healthy     {"health":"true"}                                                                             
etcd-2               Healthy     {"health":"true"}                                                                             
etcd-0               Healthy     {"health":"true"}                                                                             
[root@master bin]# kubectl cluster-info
Kubernetes control plane is running at https://192.168.217.19:6443
CoreDNS is running at https://192.168.217.19:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

各个组件pod都运行正常,静态pod里没有etcd:

[root@master bin]# kubectl get po,svc -A
NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE
kube-system   pod/coredns-7f6cbbb7b8-4vrj7         1/1     Running   0          171m
kube-system   pod/coredns-7f6cbbb7b8-9x2kg         1/1     Running   0          171m
kube-system   pod/kube-apiserver-master            1/1     Running   0          171m
kube-system   pod/kube-controller-manager-master   1/1     Running   0          171m
kube-system   pod/kube-flannel-ds-c8d2t            1/1     Running   0          168m
kube-system   pod/kube-flannel-ds-cxvxs            1/1     Running   0          168m
kube-system   pod/kube-flannel-ds-v5s85            1/1     Running   0          168m
kube-system   pod/kube-proxy-kvq2z                 1/1     Running   0          170m
kube-system   pod/kube-proxy-rwtbz                 1/1     Running   0          171m
kube-system   pod/kube-proxy-wp2ft                 1/1     Running   0          171m
kube-system   pod/kube-scheduler-master            1/1     Running   0          171m
NAMESPACE     NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                  AGE
default       service/kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP                  171m
kube-system   service/kube-dns     ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP,9153/TCP   171m

DNS功能测试正常,并且pod正常生成,表明etcd功能完全正确,此次使用外部etcd集群完全成功:

kubectl run -it --image busybox:1.28.3   dns-test --restart=Never --rm
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name:      kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
/ # nslookup kubernetes.default
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name:      kubernetes.default
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
/ # nslookup baidu.com
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name:      baidu.com
Address 1: 39.156.66.10
Address 2: 110.242.68.66
相关实践学习
通过Ingress进行灰度发布
本场景您将运行一个简单的应用,部署一个新的应用用于新的发布,并通过Ingress能力实现灰度发布。
容器应用与集群管理
欢迎来到《容器应用与集群管理》课程,本课程是“云原生容器Clouder认证“系列中的第二阶段。课程将向您介绍与容器集群相关的概念和技术,这些概念和技术可以帮助您了解阿里云容器服务ACK/ACK Serverless的使用。同时,本课程也会向您介绍可以采取的工具、方法和可操作步骤,以帮助您了解如何基于容器服务ACK Serverless构建和管理企业级应用。 学习完本课程后,您将能够: 掌握容器集群、容器编排的基本概念 掌握Kubernetes的基础概念及核心思想 掌握阿里云容器服务ACK/ACK Serverless概念及使用方法 基于容器服务ACK Serverless搭建和管理企业级网站应用
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