一、K8s快速部署

1. 节点规划

k8s-m :10.0.0.11
k8s-n1 :10.0.0.12
k8s-n2 :10.0.0.13

2.所有节点安装docker环境及依赖

2.1 上传docker-k8s.zip软件到各节点/opt,并解压

2.2 进入目录进行安装

cd /opt/docker-k8s 
yum localinstall -y *.rpm

3.master端软件安装

3.1 上传k8s-master.zip到/opt,并解压

3.2 进入目录并安装

cd /opt/k8s-master
yum localinstall -y *.rpm 

4.node节点软件安装

4.1 上传k8s-node到两个node节点/opt并解压

4.2 进入目录进行安装

cd /opt/k8s-node 
yum localinstall -y *.rpm

5.配置主节点ETCD

vim /etc/etcd/etcd.conf
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://10.0.0.11:2379"
重启服务并测试
 systemctl restart etcd.service
 systemctl enable etcd.service
 etcdctl set name oldguo
 etcdctl get name

6.配置Master节点

vim /etc/kubernetes/apiserver 
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBE_ETCD_SERVERS="--etcd-servers=http://10.0.0.11:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

vim /etc/kubernetes/config

重启服务
systemctl enable kube-apiserver.service
systemctl start kube-apiserver.service
systemctl enable kube-controller-manager.service
systemctl start kube-controller-manager.service
systemctl enable kube-scheduler.service
systemctl start kube-scheduler.service

7.node节点配置

vim /etc/kubernetes/config 
KUBE_MASTER="--master=http://10.0.0.11:8080"
vim /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=10.0.0.12/13"
KUBELET_HOSTNAME="--hostname-override=10.0.0.12/13"
KUBELET_API_SERVER="--api-servers=http://10.0.0.11:8080"

重启服务
systemctl enable kubelet.service
systemctl start kubelet.service
systemctl enable kube-proxy.service
systemctl start kube-proxy.service

8.验证节点状态

[root@k8s-m ~]# kubectl get nodes

9.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" }'
etcdctl get /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

ifconfig -a

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

10.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

配置本地register
docker tag nginx 10.0.0.11:5000/oldguo/nginx:v1 
docker run -d -p 5000:5000 --restart=always --name registry -v /opt/myregistry:/var/lib/registry  registry
docker push 10.0.0.11:5000/oldguo/nginx:v1

#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

docker pull 10.0.0.11:5000/oldguo/nginx:v1

二.k8s核心资源管理

1.PODS

1.1 创建第一个pod

mkdir /opt/yml  -p 
cd /opt/yml
[root@k8s-m yml]# cat k8s_pod.yml 
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    app: web
spec:
  containers:
    - name: nginx
      image: 10.0.0.11:5000/oldguonginx:v1
      ports:
        - containerPort: 80
[root@k8s-m yml]# kubctl create -f k8s_pod.yml

1.2 查询

kubectl get pod
kubectl get pod -o wide
kubectl get pods -o wide -l app=web
kubectl descrie pod

报错分析

++++++++++++++++++++++++++++++++++++++++
failed to "StartContainer" for "POD" with ErrImagePull: "image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request.  details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)"
+++++++++++++++++++++++++++++++++++++++

registry.access.redhat.com/rhel7/pod-infrastructure:latest
++++++++++++++++++++++++++++++++++++++

解决：
master：上传准备好的容器为本地register（pod-infrastructure-latest.tar.gz）
[root@k8s-m opt]# docker load -i pod-infrastructure-latest.tar.gz 
[root@k8s-m opt]# docker images
[root@k8s-m opt]# docker tag docker.io/tianyebj/pod-infrastructure:latest 10.0.0.11:5000/oldguo/pod-infrastructure:latest
[root@k8s-m opt]# docker images
[root@k8s-m opt]# docker push 10.0.0.11:5000/oldguo/pod-infrastructure:latest

node：（所有node节点）
[root@k8s-n1 ~]# vim /etc/kubernetes/kubelet
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=10.0.0.11:5000/oldguo/pod-infrastructure:latest"

systemctl restart kubelet.service

1.3 删除

[root@k8s-m yml]# kubectl delete pod nginx

1.4 更新

master:
[root@k8s-m yml]# docker pull nginx
[root@k8s-m yml]# docker tag docker.io/nginx:latest 10.0.0.11:5000/oldguo/nginx:v2
[root@k8s-m yml]# docker push  10.0.0.11:5000/oldguo/nginx:v2
[root@k8s-m yml]# kubectl replace  --force -f k8s_pod.yml

2.RC应用

master:
配置yml文件
vim k8s_nginx_rc.yml
 [root@master yml]# cat k8s_nginx_rc.yml 
apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx
spec:
  replicas: 3
  selector:
    app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.11:5000/oldguo/nginx:v1
        ports:
        - containerPort: 80     
[root@k8s-m yml]# kubectl create -f k8s_nginx_rc.yml        
[root@k8s-m yml]# kubectl get  rc
[root@k8s-m yml]# kubectl delete   rc nginx

副本数增删
1.修改配置文件
vim k8s_nginx_rc.yml
[root@k8s-m yml]# kubectl replace  -f k8s_nginx_rc.yml
2.kubectl edit rc nginx
3.kubectl scale rc nginx --replicas=4

滚动升级及回滚：
cp k8s_nginx_rc.yml k8s_nginx2_rc.yml
kubectl rolling-update nginx -f k8s_nginx2_rc.yml  --update-period=10s
注：
在升级过程中，可以进行回退。
# kubectl rolling-update nginxrc nginxrc1 --rollback 
如果升级完成，则不可以，使用这条指令进行回退。
# kubectl rolling-update nginx2 -f  k8s_nginx_rc.yml --update-period=10s 

3.Service

创建svc配置文件
cat >k8s_nginx_svc.yml<<EOF
apiVersion: v1
kind: Service
metadata:
  name: nginxsvc
spec:
  type: NodePort
  ports:
    - port: 80
      nodePort: 30001
  selector:
    app: nginx
EOF
[root@k8s-m yml]# kubectl create -f k8s_nginx_svc.yml 
[root@k8s-m yml]# kubectl get svc
[root@k8s-m yml]# curl -I 10.0.0.13:30001
[root@k8s-m yml]# curl -I 10.0.0.12:30001

4. deployment资源管理：

vim  k8s_nginx_dev.yml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.11:5000/oldguo/nginx:v2
        ports:
        - containerPort: 80

[root@k8s-m yml]# kubectl create -f k8s_nginx_dev.yml
[root@k8s-m yml]# kubectl get deployment

deployment滚动升级
kubectl set image deployment/nginx nginx=10.0.0.11:5000/oldguo/nginx:v1
kubectl rollout undo deployment/nginx

实现自动pod伸缩
[root@k8s-m yml]# kubectl autoscale deployment nginx --min=2 --max=6 --cpu-percent=80

HPA:

horizontalpodautoscalers
kubectl get horizontalpodautoscalers 
kubectl edit horizontalpodautoscalers nginx

K8s图形化管理

[root@k8s-m yml]# kubectl get pod --namespace=kube-system

K8s实现wordpress项目

PV
master：
yum install -y nfs-utils-*
mkdir /data
vim /etc/exports
/data 10.0.0.0/24(rw,async,no_root_squash,no_all_squash)
systemctl restart rpcbind
systemctl restart nfs
systemctl enable rpcbind
systemctl enable nfs


[root@k8s-m yml]# cat nfs_pv.yml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0001
  labels:
    type: nfs001
spec:
  capacity:
    storage: 10Gi 
  accessModes:
    - ReadWriteMany 
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: "/data"
    server: 10.0.0.11
    readOnly: false
    
[root@k8s-m yml]# cat nfs_pvc_mysql.yml     
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-mysql
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
      
          
[root@k8s-m yml]# cp  nfs_pvc_mysql.yml nfs_pvc_wp.yml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-wp
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
  selector:
    matchLabels:
      pv: nfs-pv2

[root@k8s-m yml]# kubectl create -f mysql-rc.yaml 
[root@k8s-m yml]# kubectl create -f mysql-svc.yaml  
[root@k8s-m yml]# cat mysql-rc.yaml 
apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: docker.io/mysql:5.7
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: nfs-vol
          mountPath: /var/lib/mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "somewordpress"
        - name: MYSQL_DATABASE
          value: "wordpress"
        - name: MYSQL_USER
          value: "wordpress"
        - name: MYSQL_PASSWORD
          value: "wordpress"
      volumes:
      - name: nfs-vol
        persistentVolumeClaim:
          claimName: pvc-mysql

[root@k8s-m yml]# cat mysql-svc.yaml 
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
    - port: 3306
  selector:
    app: mysql
          
[root@k8s-m yml]# kubectl get svc
mysql        10.254.63.57     <none>        3306/TCP       19s        
          

[root@k8s-m yml]# cat myweb-rc.yaml 
apiVersion: v1
kind: ReplicationController
metadata:
  name: myweb
spec:
  replicas: 1
  selector:
    app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
      - name: myweb
        image: docker.io/wordpress:latest
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nfs-vol
          mountPath: /var/www/html
        env:
        - name: WORDPRESS_DB_HOST
          value: '10.254.9.3'
        - name: WORDPRESS_DB_USER
          value: 'wordpress'
        - name: WORDPRESS_DB_PASSWORD
          value: 'wordpress'
      volumes:
      - name: nfs-vol
        persistentVolumeClaim:
          claimName: nfs2

[root@k8s-m yml]# cat myweb-svc.yaml 
apiVersion: v1
kind: Service
metadata:
  name: myweb
spec:
  type: NodePort
  ports:
    - port: 80
      nodePort: 30008
  selector:
    app: myweb

[root@k8s-m yml]# kubectl create -f myweb-rc.yaml 
[root@k8s-m yml]# kubectl create -f myweb-svc.yaml 

namespace使用

kubectl get pods --namespace=default
kubectl get pods --namespace=kube-admin
kubectl create namespace mynamespace
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
  namespace: mynamespace
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: 10.0.0.11:5000/oldguo/nginx:v2
        ports:
        - containerPort: 80

docker pull myhub.fdccloud.com/library/kube-dnsmasq-amd64:1.4
docker pull myhub.fdccloud.com/library/dnsmasq-metrics-amd64:1.0
docker pull myhub.fdccloud.com/library/kubedns-amd64:1.9
docker pull myhub.fdccloud.com/library/exechealthz-amd64:1.2

KUBELET_ARGS="--cluster_dns=10.254.230.254 --cluster_domain=cluster.local"