Kubernetes升级coredns1.8.3
日常工作中，我们有时会对一些比较低的组件做升级。
版本的升级，可以解决一下bug和漏洞，稳定系统的性能。
这次我升级对coredns升级。
coredns主要是Kubernetes中对域名和ip解析，可以作为内网的dns解析服务器。
一、查看当前coredns版本
[root@k8s-master01 ~]# kubectl get pod -n kube-system coredns-7ff77c879f-h2jw9 -oyaml | grep image f:image: {} f:imagePullPolicy: {} image: registry.aliyuncs.com/google_containers/coredns:1.6.7 imagePullPolicy: IfNotPresent image: registry.aliyuncs.com/google_containers/coredns:1.6.7 imageID: docker-pullable://registry.aliyuncs.com/google_containers/coredns@sha256:695a5e109604331f843d2c435f488bf3f239a88aec49112d452c1cbf87e88405二、升级
2.1、查询最新版coredns的版本
# coredns官网：https://github.com/coredns/coredns# 老版本用：kube-dns# 新版的都用：coredns# 部署文档：https://github.com/coredns/deployment/tree/master/kubernetes最新版地址：https://github.com/coredns/deployment/blob/master/kubernetes/coredns.yaml.sed
现在最新版是1.8.3
2.2、备份原来的cm、deploy、clusterrole、clusterrolebinding
切记：日常我们做任何操作（升级，删除，修改），一定要备份，防止错误操作，导致数据丢失，或者功能无法使用
备份好处，可以确保数据安全性，如果出现功能不能使用，可以立刻回滚，不长时间影响业务
mkdir coredns && cd corednskubectl get cm -n kube-system coredns -oyaml > coredns-config.yamlkubectl get deploy -n kube-system coredns -oyaml > coredns-controllers.yamlkubectl get clusterrole system:coredns -oyaml > coredns-clusterrole.yamlkubectl get clusterrolebinding system:coredns -oyaml > coredns-clusterrolebinding.yaml2.3、升级coredns
下载地址：git clone https://github.com/coredns/deployment.git
# 1、下载文件git clone https://github.com/coredns/deployment.git# 2、升级cd deployment/kubernetes/./deploy.sh -s | kubectl apply -f -[root@k8s-master01 ~]# cd deployment/kubernetes/[root@k8s-master01 kubernetes]# ./deploy.sh -s | kubectl apply -f -Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applyserviceaccount/coredns configuredWarning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applyclusterrole.rbac.authorization.k8s.io/system:coredns configuredWarning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applyclusterrolebinding.rbac.authorization.k8s.io/system:coredns configuredWarning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applyconfigmap/coredns configuredWarning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applydeployment.apps/coredns configuredWarning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl applyservice/kube-dns configured已经升级成功
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