centos 7 部署k8s集群

架构图：

前期准备

systemctl stop firewalld
systemctl disable firewalld

yum -y install ntp

systemctl start ntpd
systemctl enable ntpd

yum update -y

安装etcd  Kubernetes 

yum -y install etcd kubernetes  flannel

配置etcd

[root@kubernetes-master ~]# egrep -v "^#|^$" /etc/etcd/etcd.conf
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"

配置k8s api

[root@kubernetes-master ~]# egrep -v "^#|^$" /etc/kubernetes/apiserver
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_ETCD_SERVERS="--etcd-servers=http://10.64.8.68:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
KUBE_API_ARGS=""

配置flannel网络

[root@kubernetes-master ~]# egrep -v "^#|^$" /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://10.64.8.68:2379"
FLANNEL_ETCD_PREFIX="/atomic.io/network"

启动etcd k8s服务

for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler flanneld; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done

定义flannel network

[root@kubernetes-master ~]# etcdctl mk /atomic.io/network/config '{"Network":"172.17.0.0/16"}'

配置Kubernetes Minions (Nodes节点都执行一遍)

yum -y install flannel kubernetes

配置/etc/sysconfig/flanneld

[root@kubernetes-node2 ~]# egrep -v "^#|^$" /etc/sysconfig/flanneld
FLANNEL_ETCD_ENDPOINTS="http://10.64.8.68:2379"
FLANNEL_ETCD_PREFIX="/atomic.io/network"
FLANNEL_OPTIONS="" #这里可以指定哪个网卡-iface=ens192

配置k8s   /etc/kubernetes/config

[root@kubernetes-node2 ~]# egrep -v "^#|^$" /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://10.64.8.68:8080"

配置kubelet服务 /etc/kubernetes/kubelet 

[root@kubernetes-node2 ~]# egrep -v "^#|^$" /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=10.64.8.70" #这个是节点自己的IP
KUBELET_API_SERVER="--api-servers=http://10.64.8.68:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
KUBELET_ARGS=""

启动服务

for SERVICES in kube-proxy kubelet docker flanneld; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done

查看每个k8s node上的iflannel ip

 

查询相关节点

[root@kubernetes-master ~]# kubectl get nodes
NAME STATUS AGE
10.64.8.69 Ready 5d
10.64.8.70 Ready 5d
10.64.8.72 Ready 5d

创建pod测试

mkdir pods
cd pods
vim mysql.yaml

apiVersion: v1
kind: Pod
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  containers:
    - resources:
        limits :
          cpu: 1
      image: mysql
      name: mysql
      env:
        - name: MYSQL_ROOT_PASSWORD
          # change this
          value: yourpassword
      ports:
        - containerPort: 3306
          name: mysql

创建pod

kubectl create -f mysql.yaml

查看pod

[root@kubernetes-master ~]#  kubectl get pods

 创建 Creating Service

apiVersion: v1
kind: Service
metadata:
  labels:
    name: mysql
  name: mysql
spec:
  externalIPs:
    - 10.64.8.69
  ports:
    # the port that this service should serve on
    - port: 3306
  # label keys and values that must match in order to receive traffic for this service
  selector:
    name: mysql

kubectl create -f mysql-service.yaml

查询service

[root@kubernetes-master ~]# kubectl get services

 数据库容器连接测试