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

mysql.yaml

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

mysql-service.yaml

kubectl create -f mysql-service.yaml

查询service

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

数据库容器连接测试