CnetOS7 k8s docker集群搭建

环境：

centos7系统（VMware中安装的阿里云镜像）机器两台：

192.168.84.129: 用来安装kubernetes master

192.168.84.128: 用作kubernetes minion （minion）

一、 关闭系统运行的防火墙及selinux（两台机器都要）

1. 关闭系统运行的防火墙

# systemctl stop firewalld 

# systemctl disable firewalld

2. 关闭selinux

# setenforce 0
# sed -i '/^SELINUX=/cSELINUX=disabled' /etc/sysconfig/selinux

二、 master安装配置

1. 安装Kubernetes

# yum -y install etcd kubernetes

2. 配置etcd

# vi /etc/etcd/etcd.conf

ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:4001"

ETCD_ADVERTISE_CLIENT_URLS="http://localhost:4001"

3. 配置kubernetes

# vi /etc/kubernetes/apiserver
  
KUBE_API_ADDRESS="--address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet_port=10250"  ## 注意kubelet与port用“_”连接。后面的配置参数有同样的问题（master，minion中都有）
KUBE_ETCD_SERVERS="--etcd_servers=http://127.0.0.1:4001"
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. 配置flannel网络

# vi /etc/sysconfig/flanneld

FLANNEL_ETCD_ENDPOINTS="http://192.168.84.129:4001"

FLANNEL_ETCD_PREFIX="/atomic.io/network"

5. 启动etcd，kube-apiserver, kube-controller-manager，kube-scheduler服务

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

6. 设置etcd网络

# etcdctl -C //192.168.84.129:4001 set /atomic.io/network/config '{"Network":"10.1.0.0/16"}'

7. 至此master配置完成，运行kubectl get nodes可以查看有多少minion在运行，以及其状态。这里我们的minion还都没有开始安装配置，所以运行之后结果为空

# kubectl get nodes

三、minion安装配置

1. 安装Kubernetes

(1). 卸载已有的Docker

# sudo yum -y remove docker-engine

# sudo rm -rf /var/lib/docker

# sudo yum -y remove docker docker-common container-selinux

# sudo yum -y remove docker-selinux

(2).

# yum -y install flannel kubernetes

2. 配置kubernetes连接的服务端IP

# vi /etc/kubernetes/config

KUBE_MASTER="--master=http://192.168.84.129:8080"

KUBE_ETCD_SERVERS="--etcd_servers=http://192.168.84.129:4001"  

3. 配置kubernetes

# vi /etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname_override=192.168.84.128"

KUBELET_API_SERVER="--api_servers=http://192.168.84.129:8080"

# KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

KUBELET_ARGS=""

4. 配置flannel网络

# vi /etc/sysconfig/flanneld

FLANNEL_ETCD_ENDPOINTS="http://192.168.84.129:4001"

FLANNEL_ETCD_PREFIX="/atomic.io/network"

5. 启动服务

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

四、配置完成验证安装

切换到master机器上，查看有多少minion在运行

# kubectl get nodes

NAME             STATUS    AGE

192.168.84.128   Ready     23s