k8s入門系列之集羣安裝篇

關於kubernetes組件的詳解介紹,請閱讀上一篇文章《k8s入門系列之介紹篇html

Kubernetes集羣安裝部署node

•Kubernetes集羣組件:
  - etcd 一個高可用的K/V鍵值對存儲和服務發現系統
  - flannel 實現誇主機的容器網絡的通訊
  - kube-apiserver 提供kubernetes集羣的API調用
  - kube-controller-manager 確保集羣服務
  - kube-scheduler 調度容器,分配到Node
  - kubelet 在Node節點上按照配置文件中定義的容器規格啓動容器
  - kube-proxy 提供網絡代理服務docker

•集羣示意圖
  Kubernetes工做模式server-client,Kubenetes Master提供集中化管理Minions。部署1臺Kubernetes Master節點和4臺Minion節點,
 示意圖以下:api

 

•先決條件網絡

以下操做在全部機器執行ide

1.確保系統已經安裝epel-release源post

# yum -y install epel-release

2.關閉防火牆服務和selinx,避免與docker容器的防火牆規則衝突。atom

# systemctl stop firewalld
# systemctl disable firewalld
# setenforce 0

 

•安裝配置Kubernetes Master
以下操做在master上執行
1.使用yum安裝etcd和kubernetes-masterspa

# yum -y install etcd kubernetes-master

2.編輯/etc/etcd/etcd.conf文件代理

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;systemctl enable $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
以下操做在node一、node二、node三、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.按照以下內容修改對應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" #修改爲對應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.在全部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;systemctl enable $SERVICES;systemctl status $SERVICES; done

 

•驗證集羣是否安裝成功
在master上執行以下命令

[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

*註釋:上述4個節點正常顯示,狀態爲Ready,則說明集羣搭建成功,至於集羣的應用會在後續文章中介紹。

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