Kubernetes v1.22.1部署报错3:registry.aliyuncs.com/google_containers/coredns:v1.8.4...

环境介绍：

master 192.168.2.18

node1 192.168.2.19

node2 192.168.2.20

CentOS 7.5

Docker 19.03.13

2核+CPU，2GB+内存

报错信息：

 初始化Kubernetes时出现下面报错

[root@k8s-master ~]# kubeadm init --kubernetes-version=v1.22.1  --apiserver-advertise-address=192.168.1.18  --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --image-repository registry.aliyuncs.com/google_containers
[init] Using Kubernetes version: v1.22.1
[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 registry.aliyuncs.com/google_containers/coredns:v1.8.4: output: Error response from daemon: manifest for registry.aliyuncs.com/google_containers/coredns:v1.8.4 not found: manifest unknown: manifest unknown
, error: exit status 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher
           

 从上面的报错可以看出这个问题是因为在初始化Kubernetes的时候需要拉取阿里云的

registry.aliyuncs.com/google_containers/coredns:v1.8.4

这个版本的镜像，拉取失败就会报这个错误，我们可以手动拉取一下。

解决方法：

 由于安装的是Kubernetes v1.22.1版本，在初始化的时候报错信息中提示需要

registry.aliyuncs.com/google_containers/coredns:v1.8.4

版本的coredns镜像，手动拉取

registry.aliyuncs.com/google_containers/coredns:v1.8.4

版本的镜像时发现没有，所以就只能拉取一个默认版本的阿里云coredns镜像，拉取下来之后自己再手动修改一下镜像的tag信息为v1.8.4版本。

[root@k8s-master ~]# docker pull  registry.aliyuncs.com/google_containers/coredns    //手动拉取默认版本的coredns镜像
Using default tag: latest
latest: Pulling from google_containers/coredns
c6568d217a00: Pull complete
bc38a22c706b: Pull complete
Digest: sha256:6e5a02c21641597998b4be7cb5eb1e7b02c0d8d23cce4dd09f4682d463798890
Status: Downloaded newer image for registry.aliyuncs.com/google_containers/coredns:latest
registry.aliyuncs.com/google_containers/coredns:latest

[root@k8s-master ~]# docker images     //查看拉取下来的coredns镜像
...
registry.aliyuncs.com/google_containers/coredns                   latest              8d147537fb7d        3 months ago        47.6MB
...

[root@k8s-master ~]# docker tag registry.aliyuncs.com/google_containers/coredns:latest registry.aliyuncs.com/google_containers/coredns:v1.8.4       //将拉取的默认版本的coredns镜像tag信息修改为v1.8.4版本
 
[root@k8s-master ~]# docker images     //查看修改的coredns镜像tag信息
...
registry.aliyuncs.com/google_containers/coredns                   latest              8d147537fb7d        3 months ago        47.6MB
registry.aliyuncs.com/google_containers/coredns                   v1.8.4              8d147537fb7d        3 months ago        47.6MB
...