yum -y install etcd docker flannel kubenetes

一般會遇到沒有k8s源的問題，先 yum update -y 看是否有效，如果還是沒用就創建yum 源，再安裝 kubenetes

如下操作：

創建yum源

vi  virt7-docker-common-release.repo

加入以下內容：

[virt7-docker-common-release]
name=virt7-docker-common-release
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/
gpgcheck=0
 

安裝服務

執行以下命令，安裝kubernetes

yum -y install --enablerepo=virt7-docker-common-release kubernetes 

接下來開始部署：

禁用防火墻

systemctl disable iptables-services firewalld
systemctl stop iptables-services firewalld

啟動 etcd docker  flannel 服務：
1、先啟動etcd:
systemctl enable etcd.service
systemctl start etcd.service

2 配置Flannel

　　master、node上均編輯/etc/sysconfig/flanneld，修改紅色部分

# Flanneld configuration options

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://etcd:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass
#FLANNEL_OPTIONS=""
 

3 配置etcd中關於flannel的key

　　Flannel使用Etcd進行配置，來保證多個Flannel實例之間的配置一致性，所以需要在etcd上進行如下配置：（‘/atomic.io/network/config’這個key與上文/etc/sysconfig/flannel中的配置項FLANNEL_ETCD_PREFIX是相對應的，錯誤的話啟動就會出錯）

[root@k8s-master ~]# etcdctl mk /atomic.io/network/config ‘{ "Network": "10.0.0.0/16" }‘
{ "Network": "10.0.0.0/16" }

4 啟動

　　啟動Flannel之後，需要依次重啟docker

　　在master執行：

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart

　　在node上執行：

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart

在master節點配置kubernetes服務

1.修改文件/etc/kubernetes/config(所有節點)

註意，master和slave主機都要修改
指定master主機的ip，文件內容如下：

$ cat /etc/kubernetes/config


KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=0"

KUBE_ALLOW_PRIV="--allow-privileged=false"

KUBE_MASTER="--master=http://master:8080"

1.修改配置文件/etc/etcd/etcd.conf,確保etcd監聽所有地址。內容如下：

$ cat /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"

2.修改配置文件/etc/kubernetes/apiserver

cat /etc/kubernetes/apiserver


KUBE_API_ADDRESS="--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,ResourceQuota"

KUBE_API_ARGS=""

3.修改配置文件/etc/kubernetes/controller-manager，定義slave主機ip地址

KUBELET_ADDRESSES="--machines=master地址"

在master主機上，啟動服務

執行如下命令，批量啟動服務

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

slave節點配置

註意：slave節點主機，同樣要安裝docker，flannel ,k8s

yum 安裝kubernetes

yum -y install flannel docker

yum -y install --enablerepo=virt7-docker-common-release kubernetes

1.修改kubernetes配置文件，指定master。

$ cat /etc/kubernetes/config

KUBE_MASTER="--master=http://master:8080"

2.配置kubelet服務。

$ cat /etc/kubernetes/kubelet


KUBELET_ADDRESS="--address=0.0.0.0"

KUBELET_PORT="--port=10250"

KUBELET_HOSTNAME="--hostname-override=node自身"

KUBELET_API_SERVER="--api-servers=http://master:8080"

在slave主機上，啟動服務

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

驗證

現在登陸master，確認slave的狀態

$ kubectl get nodes

NAME           LABELS                                STATUS    AGE
10.16.93.182   kubernetes.io/hostname=node1   Ready     1h

這樣就配置完成了

在CentOS7上部署 Kubernetes集群