Ubuntu20.0.04安装kubernetes1.23.5

题记
这几天苦受kubernetes的折磨一直使用的Centos突然换到Ubuntu有那么点不适应

这里编写博客的内容是kubernetes踩坑的地方和安装的方法

kubernetes官方安装#已经支持中文的阅读了

Ubuntu 20.0.04	4G内存,两核CPU,100G硬盘
Ubuntu 20.0.04	4G内存,两核CPU,100G硬盘
Ubuntu 20.0.04	4G内存,两核CPU,100G硬盘

首先先去阿里云镜像仓库下载docker

阿里云镜像docker镜像仓库

进行安装完成之后

配置下镜像加速器

#这里就使用我自己的了 如果不想用可以去 ---->阿里云控制台----->容器镜像服务----->镜像加速器

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://bvx1i6ic.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl enable docker

安装kubernetes

阿里云镜像kubernetes

这里如果apt-get update更新不成功 导入公钥失败可以查看我上篇文章

查看版本信息 # apt-cache madison kubeadm

**安装 kubeadm kubectl kubelet # apt install kubeadm= ${值} kubectl= ${值} kubelet= ${值} **

启动并验证 kubelet # systemctl start kubelet && systemctl enable kubelet && systemctl status kubelet

查看安装指定版本k8s需要的镜像有那些

kubeadm config images list --kubernetes-version v1.23.5

这里推荐阿里云下载镜像

这里呢就编写一个docker pull的脚本scp传递给其他的节点

scp images-download.sh root@kubernetes2:/root #需要配置hosts文件和传递ssh密钥

scp images-download.sh root@kubernetes3:/root

cat images-download.sh
docker	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.23.5
docker	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.23.5
docker	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.23.5
docker 	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.23.5
docker 	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6
docker 	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.5.1-0
docker	 pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns/coredns:v1.8.6
docker   pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.8.6

这里注意的是三台主机都要下载

开始注意事项

设置开机自启动kubelet

systemctl  enable kubelet

首先要关闭交换分区

#临时关闭交换分区  swapoff -a
#永久关闭 vim /etc/fstab 注释swap那一行

同步时间

timedatectl set-timezone Asia/Shanghai

配置hosts文件

10.0.0.101 master
10.0.0.102 kubernetes2
10.0.0.103 kubernetes3
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

配置路由转发

sudo /bin/su -c "echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf"
sudo /bin/su -c "echo 'net.bridge.bridge-nf-call-iptables = 1' >> /etc/sysctl.conf"
sysctl -p

开始踩坑了

踩坑1

kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 --kubernetes-version=v1.23.5

[init] Using Kubernetes version: v1.23.5
[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'
error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.23.5: output: Error response from daemon: Get "https://k8s.gcr.io/v2/": context deadline exceeded
, error: exit status 1
	[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.23.5: output: Error response from daemon: Get "https://k8s.gcr.io/v2/": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
	[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.23.5: output: Error response from daemon: Get "https:/

#出现这个错误 我开始排查了很长时间以为是镜像的问题这里我就修改了镜像名称应为当时是从阿里云哪里下载过来的

docker tag 3fc1d62d6587   k8s.gcr.io/v2/kube-apiserver:v1.23.5
docker tag 3c53fa8541f9   k8s.gcr.io/v2/kube-proxy:v1.23.5
docker tag b0c9e5e4dbb1   k8s.gcr.io/v2/kube-contorller-manager:v1.23.5
docker tag 884d49d6d8c9   k8s.gcr.io/v2/kube-scheduler:v1.23.5
docker tag 25f8c7f3da61   k8s.gcr.io/v2/etcd:3.5.1-0
docker tag a4ca41631cc7   k8s.gcr.io/v2/coredns:1.8.6
docker tag 6270bb605e12   k8s.gcr.io/v2/pause:3.6

解决方法

#原来国外的不行 这里使用的镜像就变成了阿里云的
kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 --kubernetes-version=v1.23.5

踩坑2

kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.

	Unfortunately, an error has occurred:
		timed out waiting for the condition

	This error is likely caused by:
		- The kubelet is not running
		- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)

	If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:
		- 'systemctl status kubelet'
		- 'journalctl -xeu kubelet'

解决方法

vim /usr/lib/systemd/system/docker.service

ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock –exec-opt native.cgroupdriver=systemd

进行重新启动和加载容器就行了

sudo systemctl daemon-reload
sudo systemctl restart docker

踩坑3 初始化完成之后

root@master:~# kubectl  get pod --all-namespaces
NAMESPACE     NAME                             READY   STATUS    RESTARTS       AGE
kube-system   coredns-6d8c4cb4d-9pb9w          0/1     Running   2 (109s ago)   25h
kube-system   coredns-6d8c4cb4d-cspc7          0/1     Running   2 (109s ago)   25h

解决方法

root@master:~# kubectl  delete  pod coredns-6d8c4cb4d-9pb9w  -n kube-system
pod "coredns-6d8c4cb4d-9pb9w" deleted
root@master:~# kubectl  delete  pod coredns-6d8c4cb4d-cspc7  -n kube-system
pod "coredns-6d8c4cb4d-cspc7" deleted

---

望以上的错误,如君所找