k8s入門和集羣安裝

如下操作在所有機器執行
1.確保系統已經安裝epel-release源
# yum -y install epel-release
2.關閉防火牆服務，避免與Docker容器的防火牆規則衝突。
# systemctl stop firewalld
# systemctl disable firewalld

•安裝配置Kubernetes Master
如下操作在master上執行
1.使用yum安裝etcd和kubernetes-master
# yum -y install etcd kubernetes-master
2.編輯/etc/etcd/etcd.conf文件
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”
3.編輯/etc/kubernetes/apiserver文件

KUBE_API_ADDRESS=”–insecure-bind-address=0.0.0.0”
KUBE_API_PORT=”–port=8080”
KUBELET_PORT=”–kubelet-port=10250”
KUBE_ETCD_SERVERS=”–etcd-servers=http://127.0.0.1:2379”
KUBE_SERVICE_ADDRESSES=”–service-cluster-ip-range=10.254.0.0/16”
KUBE_ADMISSION_CONTROL=”–admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota”
KUBE_API_ARGS=”“

4.啓動etcd、kube-apiserver、kube-controller-manager、kube-scheduler等服務，並設置開機啓動。
# for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart SERVICES;systemctlenable SERVICES;systemctl status $SERVICES ; done
5.在etcd中定義flannel網絡
# etcdctl mk /atomic.io/network/config ‘{“Network”:”172.17.0.0/16”}’

•安裝配置Kubernetes Node
如下操作在node1、node2、node3、node4上執行
1.使用yum安裝flannel和kubernetes-node
# yum -y install flannel kubernetes-node
2.爲flannel網絡指定etcd服務，修改/etc/sysconfig/flanneld文件
FLANNEL_ETCD=”http://192.168.30.20:2379”
FLANNEL_ETCD_KEY=”/atomic.io/network”
3.修改/etc/kubernetes/config文件
KUBE_LOGTOSTDERR=”–logtostderr=true”
KUBE_LOG_LEVEL=”–v=0”
KUBE_ALLOW_PRIV=”–allow-privileged=false”
KUBE_MASTER=”–master=http://192.168.30.20:8080”
4.按照如下內容修改對應node的配置文件/etc/kubernetes/kubelet
node1:

KUBELET_ADDRESS=”–address=0.0.0.0”
KUBELET_PORT=”–port=10250”
KUBELET_HOSTNAME=”–hostname-override=192.168.30.21” #修改成對應Node的IP
KUBELET_API_SERVER=”–api-servers=http://192.168.30.20:8080” #指定Master節點的API Server
KUBELET_POD_INFRA_CONTAINER=”–pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest”
KUBELET_ARGS=”“

node2:

KUBELET_ADDRESS=”–address=0.0.0.0”
KUBELET_PORT=”–port=10250”
KUBELET_HOSTNAME=”–hostname-override=192.168.30.22”
KUBELET_API_SERVER=”–api-servers=http://192.168.30.20:8080”
KUBELET_POD_INFRA_CONTAINER=”–pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest”
KUBELET_ARGS=”“

node3:

KUBELET_ADDRESS=”–address=0.0.0.0”
KUBELET_PORT=”–port=10250”
KUBELET_HOSTNAME=”–hostname-override=192.168.30.23”
KUBELET_API_SERVER=”–api-servers=http://192.168.30.20:8080”
KUBELET_POD_INFRA_CONTAINER=”–pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest”
KUBELET_ARGS=”“

node4:

KUBELET_ADDRESS=”–address=0.0.0.0”
KUBELET_PORT=”–port=10250”
KUBELET_HOSTNAME=”–hostname-override=192.168.30.24”
KUBELET_API_SERVER=”–api-servers=http://192.168.30.20:8080”
KUBELET_POD_INFRA_CONTAINER=”–pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest”
KUBELET_ARGS=”“

5.在所有Node節點上啓動kube-proxy,kubelet,docker,flanneld等服務，並設置開機啓動。
# for SERVICES in kube-proxy kubelet docker flanneld;do systemctl restart SERVICES;systemctlenable SERVICES;systemctl status $SERVICES; done

•驗證集羣是否安裝成功
在master上執行如下命令

[root@master ~]# kubectl get node
NAME STATUS AGE
192.168.30.21 Ready 1m
192.168.30.22 Ready 1m
192.168.30.23 Ready 1m
192.168.30.24 Ready 1m