kubernetes初始化过程

 

[[email protected] ~]# rpm -ql kubelet-1.22.0-0.x86_64
/etc/kubernetes/manifests
/etc/sysconfig/kubelet
/usr/bin/kubelet
/usr/lib/systemd/system/kubelet.service
[[email protected] ~]# 
[[email protected] ~]# 

[[email protected] ~]# rpm -ql kubectl-1.22.0-0.x86_64
/usr/bin/kubectl
[[email protected] ~]# 

[[email protected] ~]# rpm -ql kubernetes-cni-0.8.7-0.x86_64
/opt/cni
/opt/cni/bin
/opt/cni/bin/bandwidth
/opt/cni/bin/bridge
/opt/cni/bin/dhcp
/opt/cni/bin/firewall
/opt/cni/bin/flannel
/opt/cni/bin/host-device
/opt/cni/bin/host-local
/opt/cni/bin/ipvlan
/opt/cni/bin/loopback
/opt/cni/bin/macvlan
/opt/cni/bin/portmap
/opt/cni/bin/ptp
/opt/cni/bin/sbr
/opt/cni/bin/static
/opt/cni/bin/tuning
/opt/cni/bin/vlan

[[email protected] ~]# rpm -ql kubeadm-1.22.0-0.x86_64
/usr/bin/kubeadm
/usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
[[email protected] ~]# 

[[email protected] ~]# kubeadm init --image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers --kubernetes-version v1.22.0 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12
[init] Using Kubernetes version: v1.22.0
[preflight] Running pre-flight checks
[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 [10.96.0.1 192.168.122.2]
[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] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [localhost master] and IPs [192.168.122.2 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master] and IPs [192.168.122.2 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[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"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[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 10.508408 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: mrch2t.b9zd4hof04zz785m
[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 192.168.122.2:6443 --token mrch2t.b9zd4hof04zz785m \
	--discovery-token-ca-cert-hash sha256:1a66bc128e254d95d8adc8d0ef62b45460de4bf7795c74bce59ca23140dad65b 
[[email protected] ~]# 

报错：The connection to the server localhost:8080 was refused - did you specify the right host or port?

K8s集群初始化成功后，kubectl get nodes 查看节点信息时报错

报错信息：The connection to the server localhost:8080 was refused - did you specify the right host or port?

[[email protected] ~]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决方法：

执行以下命令

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
再次查看节点信息即可看到：

kubectl get nodes

[[email protected] ~]# kubectl get nodes
NAME     STATUS     ROLES                  AGE     VERSION
master   NotReady   control-plane,master   4h32m   v1.22.0
[[email protected] ~]#