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K8S基础项目配置
2020/11/05 2k 11 分钟 点击

K8S

之前安装过docker需进行卸载

yum -y remove docker docker-common docker-selinux docker-engine docker-engine-selinux container-selinux docker-ce

或者
yum -y remove docker*

#删除所有的镜像、容器、数据卷、配置文件等
sudo rm -rf /var/lib/docker

查看安装的docker相关软件 卸载情况

yum list installed | grep docker

用国内阿里云安装

Set up repository

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

Use Aliyun Docker

sudo yum-config-manager –add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

查看指定版本

yum list docker-ce –showduplicates

安装指定版本

yum install -y –setopt=obsoletes=0
docker-ce-17.03.2.ce-1.el7.centos.x86_64
docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch

不指定版本号 默认安装最新版

sudo yum install docker-ce

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
  3. 1 上传docker-k8s.zip软件到各节点/opt,并解压
  4. 2 进入目录进行安装
    cd /opt/docker-k8s
    yum localinstall -y *.rpm
  5. master端软件安装
  6. 1 上传k8s-master.zip到/opt,并解压
  7. 2 进入目录并安装
    cd /opt/k8s-master
    yum localinstall -y *.rpm
  8. node节点软件安装
  9. 1 上传k8s-node到两个node节点/opt并解压
  10. 2 进入目录进行安装
    cd /opt/k8s-node
    yum localinstall -y *.rpm
  11. 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://172.16.69.145:2379"
    重启服务并测试
    systemctl restart etcd.service
    systemctl enable etcd.service
    etcdctl set name yang
    etcdctl get name
  12. 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://172.16.69.145:2379"
    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-co ntroller-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://172.16.69.145:8080"
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

所有节点
yum install flannel -y
sed -i ‘s#http://127.0.0.1:2379#http://172.16.69.145:2379#g' /etc/sysconfig/flanneld

master节点:
etcdctl mk /atomic.io/network/config ‘{ “Network”: “172.16.0.0/16” }’
etcdctl get /atomic.io/network/config
{ “Network”: “172.16.0.0/16” }

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=172.16.69.145:5000’

systemctl restart docker

配置本地register
docker pull nginx
docker tag nginx 172.16.69.145:5000/yang/nginx:v1
docker run -d -p 5000:5000 –restart=always –name registry -v /opt/myregistry:/var/lib/registry registry
docker push 172.16.69.145:5000/yang/nginx:v1

#node节点
vim /etc/sysconfig/docker
OPTIONS=’–selinux-enabled –log-driver=journald –signature-verification=false –insecure-registry=172.16.69.145:5000’
systemctl restart docker

docker pull 172.16.69.145:5000/yang/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]a# cat k8s_pod.yml 
apiVersion: v1
kind: Pod
metadata: 
  name: nginx
  labels:
    app: web
spec:
  containers:
    - name: nginx
      image: 172.16.69.145:5000/yang/nginx:v1
      ports:
        - containerPort: 80
[root@k8s-m yml]# kubectl 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 describe 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)”
+++++++++++++++++++++++++++++++++++++++
11
registry.access.redhat.com/rhel7/pod-infrastructure:latest
++++++++++++++++++++++++++++++++++++++

解决1:
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 172.16.69.145:5000/yang/pod-infrastructure:latest
[root@k8s-m opt]# docker images
[root@k8s-m opt]# docker push 172.16.69.145:5000/yang/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

解决2:

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-rc
spec:
replicas: 3
selector:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: 172.16.69.145:5000/yang/nginx:v1
ports:
- containerPort: 80
command: [“nginx”,”-g”,”daemon off;”]
[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_nginx_rc1.yml
kubectl rolling-update nginx-rc -f k8s_nginx_rc1.yml –update-period=10s
注:
在升级过程中,可以进行回退。
#kubectl rolling-update nginx-rc nginx-rc1 –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:
      - nam=e: 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=172.16.69.145:5000/yang/nginx:v1
kubectl rollout undo deployment/nginx

HPA:

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

horizontalpodautoscalers
kubectl get horizontalpodautoscalers 
kubectl edit horizontalpodautoscalers nginx

K8s图形化管理

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

K8s实现wordpress项目

PV
master:
yum install -y nfs-utils-*
mkdir /data /code
vim /etc/exports
/data 172.16.69.0/24(rw,async,no_root_squash,no_all_squash)
/code 172.16.69.0/24(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_data.yml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0001
  labels:
    type: nfs001
spec:
  capacity:
    storage: 10Gi 
  accessModes:
    - ReadWriteMany 
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: "/data"
    server: 172.16.69.145
    readOnly: false

[root@k8s-m yml]# cat nfs_pv_code.yml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv0002
  labels:
    type: nfs002
spec:
  capacity:
    storage: 10Gi 
  accessModes:
    - ReadWriteMany 
  persistentVolumeReclaimPolicy: Recycle
  nfs:
    path: “/code”
    server: 172.16.69.145
    readOnly: false


[root@k8s-m yml]# cat nfs_pvc_mysql.yml     
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pv0001
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
selector:
    matchLabels:
      pv: nfs001


[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: nfs002


[root@k8s-master wordpress]# kubectl create -f nfs_pv_data.yml
[root@k8s-master wordpress]# kubectl create -f nfs_pv_code.yml
[root@k8s-master wordpress]# kubectl create -f nfs_pvc_mysql.yml
[root@k8s-master wordpress]# kubectl create -f nfs_pvc_wp.yml


[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: 172.16.69.145:5000/yang/mysql:5.7
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: nfs-vol
          mountPath: /var/lib/mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: “1”
        - name: MYSQL_DATABASE
          value: "wordpress"
        - name: MYSQL_USER
          value: "wordpress"
        - name: MYSQL_PASSWORD
          value: "wordpress"
      volumes:
      - name: nfs-vol
        persistentVolumeClaim:
          claimName: pv0001

[root@k8s-m yml]# cat mysql-svc.yaml 
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  type: NodePort
  ports:
    - port: 3306
    nodePort: 33060
  selector:
    app: mysql

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


[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: 2
  selector:
    app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
      - name: myweb
        image: 172.16.69.145:5000/yang/wordpress:latest
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nfs-vol
          mountPath: /var/www/html
        env:
        - name: WORDPRESS_DB_HOST
          value: '10.254.237.109'
        - name: WORDPRESS_DB_USER
          value: 'wordpress'
        - name: WORDPRESS_DB_PASSWORD
          value: 'wordpress'
      volumes:
      - name: nfs-vol
        persistentVolumeClaim:
          claimName: pv0002

[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.fdcclod.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”

Kubernetes