kubernetes学习笔记

本文的环境介绍

[root@m-30-1 ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.2", GitCommit:"81753b10df112992bf51bbc2c2f85208aad78335", GitTreeState:"clean", BuildDate:"2018-04-27T09:22:21Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.2", GitCommit:"81753b10df112992bf51bbc2c2f85208aad78335", GitTreeState:"clean", BuildDate:"2018-04-27T09:10:24Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
[root@m-30-1 ~]# rpm -qf /etc/issue
centos-release-7-4.1708.el7.centos.x86_64

kubernetes集群是通过kubeadm安装的

本文中很多内容都参考了净超大神的网站,大家可以多看看，O(∩_∩)O~

kubernetes替换默认的kube-dns为coredns

之所以是因为好多人说kube-dns太不好用了，而且我是用kubeadm安装的运行了一段时间，master节点的pod的DNS就用不了了，我就换了coredns就好了。

# 导出原来的deployment
kubectl get -n kube-system deployment kube-dns -o yaml > /tmp/kube-dns-deployment.yaml
# 然后就开始替换了
cd /opt
git clone https://github.com/coredns/deployment.git
cd /opt/coredns/deployment/kubernetes
./deploy.sh |kubectl apply -f -
kubectl delete --namespace=kube-system deployment kube-dns

helm以daemonset方式部署ingress-nginx

首先查看整体的变量然后修改对应的参数，具体如下

[root@m-30-1 deploy]# helm inspect values stable/nginx-ingress|egrep -v "^$" > value2.yaml
[root@m-30-1 deploy]# diff value.yaml value2.yaml
1d0
<
17c16
<   hostNetwork: true
---
>   hostNetwork: false
24c23
<     useHostPort: true
---
>     useHostPort: false
66c65
<   kind: DaemonSet
---
>   kind: Deployment
88,89c87
<   nodeSelector:
<     kubernetes.io/hostname: m-30-2
---
>   nodeSelector: {}
270c268,287

我们还是测试环境所以设置了nodeSelector。