在CentOS7上部署 Kubernetes集群

yum -y install etcd docker flannel kubenetes

一般会遇到没有k8s源的问题，先 yum update -y 看是否有效，如果还是没用就创建yum 源，再安装 kubenetes

如下操作：

vi  virt7-docker-common-release.repo

加入以下内容：

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

安装服务

执行以下命令，安装kubernetes

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

接下来开始部署：

设置三台机器的主机名：

　　Master上执行：

[root@localhost ~]#  hostnamectl --static set-hostname  k8s-master

　　Node1上执行：

[root@localhost ~]# hostnamectl --static set-hostname  k8s-node-1

　　Node2上执行：

[root@localhost ~]# hostnamectl --static set-hostname  k8s-node-2

禁用防火墙（所有机器）

systemctl disable  firewalld.services

systemctl stop  firewalld.services

启动 etcd docker  flannel 服务：


1、先启动etcd:


systemctl enable etcd.service


systemctl start etcd.service

2 配置Flannel

　　master、node上均编辑/etc/sysconfig/flanneld，修改红色部分

[root@k8s-master ~]# vi /etc/sysconfig/flanneld

# 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中关于flannel的key

　　Flannel使用Etcd进行配置，来保证多个Flannel实例之间的配置一致性，所以需要在etcd上进行如下配置：（‘/atomic.io/network/config’这个key与上文/etc/sysconfig/flannel中的配置项FLANNEL_ETCD_PREFIX是相对应的，错误的话启动就会出错）

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

4 启动

　　启动Flannel之后，需要依次重启docker

　　在master执行：

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

　　在node上执行：

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

在master节点配置etcd

yum安装的etcd默认配置文件在/etc/etcd/etcd.conf。编辑配置文件，更改以下带颜色部分信息：

[root@localhost ~]# vi /etc/etcd/etcd.conf

# [member]
ETCD_NAME=master
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
#ETCD_WAL_DIR=""
#ETCD_SNAPSHOT_COUNT="10000"
#ETCD_HEARTBEAT_INTERVAL="100"
#ETCD_ELECTION_TIMEOUT="1000"
#ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379,http://0.0.0.0:4001"
#ETCD_MAX_SNAPSHOTS="5"
#ETCD_MAX_WALS="5"
#ETCD_CORS=""
#
#[cluster]
#ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"
# if you use different ETCD_NAME (e.g. test), set ETCD_INITIAL_CLUSTER value for this name, i.e. "test=http://..."
#ETCD_INITIAL_CLUSTER="default=http://localhost:2380"
#ETCD_INITIAL_CLUSTER_STATE="new"
#ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd:2379,http://etcd:4001"
#ETCD_DISCOVERY=""
#ETCD_DISCOVERY_SRV=""
#ETCD_DISCOVERY_FALLBACK="proxy"
#ETCD_DISCOVERY_PROXY=""

在master节点配置kubernetes服务

1.修改文件/etc/kubernetes/config(所有节点)

注意，master和slave主机都要修改

指定master主机的ip，文件内容如下：

$ 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,确保etcd监听所有地址。内容如下：

$ 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，定义slave主机ip地址

KUBELET_ADDRESSES="--machines=master地址"

在master主机上，启动服务

执行如下命令，批量启动服务

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

slave节点配置

注意：slave节点主机，同样要安装docker，flannel ,k8s

yum 安装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服务。

$ 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主机上，启动服务

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

验证

现在登陆master，确认slave的状态

$ kubectl get nodes

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


这样就配置完成了