2019-05-27 kubernetes day1

1. kubernetes yum安装

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
1：修改IP地址、主机名和host解析
10.0.0.11  k8s-master
10.0.0.12  k8s-node-1
10.0.0.13  k8s-node-2

2：所有节点安装docker-1.12.6-68
yum localinstall docker-common-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y
yum localinstall docker-client-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y
yum localinstall docker-1.12.6-71.git3e8e77d.el7.centos.x86_64.rpm -y

3：master节点安装etcd
yum install etcd -y

vim /etc/etcd/etcd.conf
6行：ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
21行：ETCD_ADVERTISE_CLIENT_URLS="http://10.0.0.11:2379"
 
systemctl start etcd.service
systemctl enable etcd.service
 
etcdctl set testdir/testkey0 0
etcdctl get testdir/testkey0

etcdctl -C http://10.0.0.11:2379 cluster-health

4：master节点安装kubernetes
yum install kubernetes-master.x86_64 -y

vim /etc/kubernetes/apiserver 
8行:  KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
11行：KUBE_API_PORT="--port=8080"
17行：KUBE_ETCD_SERVERS="--etcd-servers=http://10.0.0.11:2379"
23行：KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

vim /etc/kubernetes/config
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"

systemctl enable kube-apiserver.service
systemctl restart kube-apiserver.service
systemctl enable kube-controller-manager.service
systemctl restart kube-controller-manager.service
systemctl enable kube-scheduler.service
systemctl restart kube-scheduler.service


[root@k8s-master opt]# kubectl get componentstatus   检查测试
NAME                 STATUS    MESSAGE             ERROR
etcd-0               Healthy   {"health":"true"}   
scheduler            Healthy   ok                  
controller-manager   Healthy   ok   

5：node节点安装kubernetes
yum install kubernetes-node.x86_64 -y

vim /etc/kubernetes/config 
22行：KUBE_MASTER="--master=http://10.0.0.11:8080"

vim /etc/kubernetes/kubelet
5行：KUBELET_ADDRESS="--address=0.0.0.0"
8行：KUBELET_PORT="--port=10250"
11行：KUBELET_HOSTNAME="--hostname-override=10.0.0.12"
14行：KUBELET_API_SERVER="--api-servers=http://10.0.0.11:8080"


systemctl enable kubelet.service
systemctl start kubelet.service
systemctl enable kube-proxy.service
systemctl start kube-proxy.service

6：所有节点配置flannel网络
yum install flannel -y

sed -i 's#http://127.0.0.1:2379#http://10.0.0.11:2379#g' /etc/sysconfig/flanneld

etcdctl mk /atomic.io/network/config '{ "Network": "172.16.0.0/16" }'

master节点：
systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kube-apiserver.service
systemctl restart kube-controller-manager.service
systemctl restart kube-scheduler.service

node节点：
systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kubelet.service
systemctl restart kube-proxy.service

7：配置master为镜像仓库
#master节点
vim /etc/sysconfig/docker
OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false --registry-mirror=https://registry.docker-cn.com --insecure-registry=10.0.0.11:5000'

systemctl restart docker

docker run -d -p 5000:5000 --restart=always --name registry -v /opt/myregistry:/var/lib/registry  registry

#node节点
vim /etc/sysconfig/docker
OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false --insecure-registry=10.0.0.11:5000'

systemctl restart docker

2.k8s: 一切皆资源

pod 创建

master的操作：
上传 k8s_pod.yaml 文件
vim k8s_pod.yaml 进行查看
wget http://192.168.21.15/docker_nginx1.13.tar.gz
docker load -i docker_nginx1.13.tar.gz 
docker tag docker.io/nginx:1.13 10.0.0.11:5000/nginx:1.13
docker push 10.0.0.11:5000/nginx:1.13
kubectl create -f k8s_pod.yaml 创建资源
systemctl restart kube-apiserver.service  
kubectl get pods  查看资源

kubectl describe pod nginx 详细查看资源
第一个问题：没有这个文件和目录
kubectl describe pod nginx

image.png

解决思路：
[root@k8s-node2 ~]# vim /etc/kubernetes/kubelet 修改成私有仓库地址

image.png

systemctl restart kubelet.service 

mster节点   上传镜像到私有仓库
docker load -i pod-infrastructure-latest.tar.gz 
docker tag docker.io/tianyebj/pod-infrastructure:latest 10.0.0.11:5000/pod-infrastructure:latest
docker push 10.0.0.11:5000/pod-infrastructure:latest
[root@k8s-master ~]# kubectl get pods
NAME      READY     STATUS    RESTARTS   AGE
nginx     1/1       Running   0          1h