k8s kubeadm 集群部署

k8s 集群 容器镜像准备

使用kubeadm部署k8s集群，所以k8s集群的所有核心组件均以pod运行、

需要准备镜像，不然初始化的时候会自动下载，时间会很长。

所有用到的镜像，已经上传到百度云中

链接：https://pan.baidu.com/s/1LjApqxw44q-xX–05Rs8pw

提取码：6666

# 查看所需要的镜像
kubeadm config images list
W0804 17:55:12.248884   13607 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
k8s.gcr.io/kube-apiserver:v1.18.6
k8s.gcr.io/kube-controller-manager:v1.18.6
k8s.gcr.io/kube-scheduler:v1.18.6
k8s.gcr.io/kube-proxy:v1.18.6
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.7

kubeadm config images list >> image.list
# 修改image.list，改为脚本

可能会因为网络问题而找不到响应的镜像，我们可以去国内可以访问的docker镜像源下载,然后修改tag

#!/bin/bash
img_list='k8s.gcr.io/kube-apiserver:v1.18.6
k8s.gcr.io/kube-controller-manager:v1.18.6
k8s.gcr.io/kube-scheduler:v1.18.6
k8s.gcr.io/kube-proxy:v1.18.6
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.7'

for img in ${img_list}
do
    docker pull $img
done


#!/bin/bash
img_list='kubesphere/kube-apiserver:v1.18.6
kubesphere/kube-controller-manager:v1.18.6
kubesphere/kube-scheduler:v1.18.6
kubesphere/kube-proxy:v1.18.6
kubesphere/pause:3.2
docker pull mirrorgcrio/etcd:3.4.3-0
coredns/coredns:1.6.7'

for img in ${img_list}
do
    docker pull $img
done



docker tag kubesphere/kube-apiserver:v1.18.6 k8s.gcr.io/kube-apiserver:v1.18.6
docker tag kubesphere/kube-controller-manager:v1.18.6 k8s.gcr.io/kube-controller-manager:v1.18.6
docker tag kubesphere/kube-scheduler:v1.18.6 k8s.gcr.io/kube-scheduler:v1.18.6
docker tag kubesphere/kube-proxy:v1.18.6 k8s.gcr.io/kube-proxy:v1.18.6
docker tag kubesphere/pause:3.2 k8s.gcr.io/pause:3.2
docker tag mirrorgcrio/etcd:3.4.3 k8s.gcr.io/etcd:3.4.3-0
docker tag coredns/coredns:1.6.7 k8s.gcr.io/coredns:1.6.7


docker save k8s.gcr.io/kube-apiserver:v1.18.6 -o kube-apiserver_v1.18.6.tar
docker save k8s.gcr.io/kube-controller-manager:v1.18.6  -o kube-controller-manager_v1.18.6.tar
docker save k8s.gcr.io/kube-scheduler:v1.18.6  -o kube-scheduler_v1.18.6.tar
docker save k8s.gcr.io/kube-proxy:v1.18.6  -o kube-proxy_v1.18.6.tar
docker save k8s.gcr.io/pause:3.2  -o pause_3.2.tar
docker save k8s.gcr.io/etcd:3.4.3-0  -o etcd_3.4.3-0.tar
docker save k8s.gcr.io/coredns:1.6.7  -o coredns_1.6.7.tar


docker load -i kube-apiserver_v1.18.6.tar
docker load -i kube-controller-manager_v1.18.6.tar
docker load -i kube-scheduler_v1.18.6.tar
docker load -i kube-proxy_v1.18.6.tar
docker load -i pause_3.2.tar
docker load -i etcd_3.4.3-0.tar
docker load -i coredns_1.6.7.tar

worker节点 不需要全部的镜像，只需要以下两个镜像

kube-proxy
pause

docker load -i xxx

k8s 集群初始化

# 在master节点操作
# 指定k8s版本 pod网络 和 apiserver地址为当前master的ip
kubeadm init --kubernetes-version=v1.18.6 --pod-network-cidr=172.16.0.0/16 --apiserver-advertise-address=192.168.56.100

初始化成功,如果失败了,调整镜像或者配置，重启 kubeadm 即可 sudo kubeadm reset

[root@master1 ~]# kubeadm init --kubernetes-version=v1.18.6 --pod-network-cidr=172.16.0.0/16 --apiserver-advertise-address=192.168.56.100
W0805 04:54:47.572575    6614 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
[init] Using Kubernetes version: v1.18.6
[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'
[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
[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 [master1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.56.100]
[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 [master1 localhost] and IPs [192.168.56.100 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [master1 localhost] and IPs [192.168.56.100 127.0.0.1 ::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
[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"
W0805 04:54:52.181396    6614 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[control-plane] Creating static Pod manifest for "kube-scheduler"
W0805 04:54:52.182423    6614 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[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 23.015400 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.18" 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 master1 as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node master1 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: 419shm.tyxdhbuymbaaujfr
[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

# kubeadm init 成功信息
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

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 192.168.56.100:6443 --token 419shm.tyxdhbuymbaaujfr \
    --discovery-token-ca-cert-hash  sha256:1d496f3d960a14dae56cc689847866f10354bef455d80815374b73a24b46557d

按照返回的提示信息执行

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

安装网络插件

wget https://docs.projectcalico.org/v3.15/manifests/calico.yaml
vim  calico.yaml
# 大概在3580行，取消注释，将ip修改为我们指定的 172.16.0.0/16
- name: CALICO_IPV4POOL_CIDR
  value: "172.16.0.0/16"

kubectl apply -f  calico.yaml
# kubectl get nodes Ready 则准备好了, 如果没有事先导入calico镜像，这个会很久

安装完毕网络 加入集群(卡在这里，加入不了)

kubeadm join 192.168.56.100:6443 --token 419shm.tyxdhbuymbaaujfr \
    --discovery-token-ca-cert-hash  sha256:1d496f3d960a14dae56cc689847866f10354bef455d80815374b73a24b46557d

验证集群可用

# 查看节点 , Ready 则准备好了
kubectl get nodes
master1   Ready    master   5h41m   v1.18.6