Docker+K8S 集群环境搭建及分布式应用部署

yum install docker
#启动服务
systemctl start docker.service
systemctl enable docker.service
#测试
docker version

yum install etcd -y
#启动etcd
systemctl start etcd
systemctl enable etcd
#输入如下命令查看 etcd 健康状况
etcdctl -C http://localhost:2379 cluster-health
#安装 Kubernetes
yum install kubernetes -y

KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"

systemctl start kube-apiserver
systemctl enable kube-apiserver
systemctl start kube-controller-manager
systemctl enable kube-controller-manager
systemctl start kube-scheduler
systemctl enable kube-scheduler

systemctl start kubelet
systemctl enable kubelet
systemctl start kube-proxy
systemctl enable kube-proxy

yum install flannel -y

--logtostderr=false --log_dir=/var/log/k8s/flannel/ --etcd-prefix=/atomic.io/network --etcd-endpoints=http://localhost:2379 --iface=enp0s3

etcdctl mk /atomic.io/network/config '{ "Network": "10.0.0.0/16" }' 

systemctl enable flanneld 
systemctl start flanneld
service docker restart
systemctl restart kube-apiserver
systemctl restart kube-controller-manager
systemctl restart kube-scheduler
systemctl enable flanneld
systemctl start flanneld
service docker restart
systemctl restart kubelet
systemctl restart kube-proxy

#下载java8的镜像
FROM java:8
#将本地文件挂到到/tmp目录
VOLUME /tmp
#复制文件到容器
ADD demo-0.0.1-SNAPSHOT.jar /demo.jar
#暴露8080端口
EXPOSE 8080
#配置启动容器后执行的命令
ENTRYPOINT ["java","-jar","/demo.jar"]

docker build -t demo .

apiVersion: v1
kind: ReplicationController
metadata:
 name: demo
spec:
 # 节点数，设置为多个可以实现负载均衡效果
 replicas: 1
 selector:
  app: demo
 template:
  metadata:
   labels:
    app: demo
  spec:
   containers:
   - name: demo
    #镜像名
    image: demo
    #本地有镜像就不会去仓库拉取
    imagePullPolicy: IfNotPresent
    ports:
    - containerPort: 8080

kubectl create -f demo-rc.yaml 

yum install *rhsm* -y

touch /etc/rhsm/ca/redhat-uep.pem

[root@MiWiFi-R3-srv ~]# kubectl delete rc demo
replicationcontroller "demo" deleted
[root@MiWiFi-R3-srv ~]# kubectl create -f demo-rc.yaml 
replicationcontroller "demo" created

[root@MiWiFi-R3-srv ~]# kubectl get po
NAME     READY   STATUS  RESTARTS  AGE
demo-hdmxs  1/1    Running  0     1m

apiVersion: v1
kind: Service
metadata:
 name: demo
spec:
 type: NodePort
 ports:
 - port: 8080
  targetPort: 8080
  # 节点暴露给外部的端口（范围必须为30000-32767）
  nodePort: 30001
 selector:
  app: demo

[root@MiWiFi-R3-srv ~]# kubectl create -f demo-svc.yaml 
service "demo" created

systemctl stop firewalld
iptables -P FORWARD ACCEPT