k8s 集群搭建

一,环境介绍

	master	node1	node2
IP	192.168.0.164	192.168.0.165	192.168.0.167
环境	centos 7	centos 7	centos 7

二,配置安装

　　　三台节点操作实例:"

　　　01,配置yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]

name=Kubernetes

baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64

enabled=1

gpgcheck=0

repo_gpgcheck=0

gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg

        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

　　　　02,安装ETCD

yum install -y etcd

　　　　　节点加入:

master节点加入:(IP 192.168.1.164)

etcd -name infra1 -initial-advertise-peer-urls http://192.168.0.164:2380 -listen-peer-urls http://192.168.0.164:2380 -listen-client-urls http://192.168.0.164:2379,http://127.0.0.1:2379 -advertise-client-urls http://192.168.0.164:2379 -initial-cluster-token etcd-cluster-1 -initial-cluster infra1=http://192.168.0.164:2380,infra2=http://192.168.0.165:2380,infra3=http://192.168.0.167:2380 -initial-cluster-state new

node1节点加入:(IP 192.168.1.165)

etcd -name infra2 -initial-advertise-peer-urls http://192.168.0.165:2380 -listen-peer-urls http://192.168.0.165:2380 -listen-client-urls http://192.168.0.165:2379,http://127.0.0.1:2379 -advertise-client-urls http://192.168.0.165:2379 -initial-cluster-token etcd-cluster-1 -initial-cluster infra1=http://192.168.0.164:2380,infra2=http://192.168.0.165:2380,infra3=http://192.168.0.167:2380 -initial-cluster-state new

node2节点加入:(IP 192.168.1.167)

etcd -name infra3 -initial-advertise-peer-urls http://192.168.0.167:2380 -listen-peer-urls http://192.168.0.167:2380 -listen-client-urls http://192.168.0.167:2379,http://127.0.0.1:2379 -advertise-client-urls http://192.168.0.167:2379 -initial-cluster-token etcd-cluster-1 -initial-cluster infra1=http://192.168.0.164:2380,infra2=http://192.168.0.165:2380,infra3=http://192.168.0.167:2380 -initial-cluster-state new

　　　　　　ECTD节点检查:

　　启动后另起一个窜口输入命令

　etcdctl cluster-health

　　　　说明成功

　　　　　　节点管理:(更改ip即可完成多台)

　　　　　　vim /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/root
ExecStart=etcd -name infra1 -initial-advertise-peer-urls http://192.168.0.164:2380 -listen-peer-urls http://192.168.0.164:2380 -listen-client-urls http://192.168.0.164:2379,http://127.0.0.1:2379 -advertise-client-urls http://192.168.0.164:2379 -initial-cluster-token etcd-cluster-1 -initial-cluster infra1=http://192.168.0.164:2380,infra2=http://192.168.0.165:2380,infra3=http://192.168.0.167:2380 -initial-cluster-state new
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

　　　　

#!/bin/bash
echo '################ Prerequisites...'
systemctl stop firewalld
systemctl disable firewalld
yum -y install ntp
systemctl start ntpd
systemctl enable ntpd

echo '################ Installing flannel...'
#安装flannel
yum install flannel -y

echo '################ Add subnets for flannel...'
A_SUBNET=172.17.0.0/16
B_SUBNET=192.168.0.0/16
C_SUBNET=10.254.0.0/16

FLANNEL_SUBNET=$A_SUBNET
SERVICE_SUBNET=$B_SUBNET
OCCUPIED_IPs=(`ifconfig -a | grep 'inet ' | cut -d ':' -f 2 |cut -d ' ' -f 1 | grep -v '^127'`)
for ip in ${OCCUPIED_IPs[@]};do
    if [ $(ipcalc -n $ip/${A_SUBNET#*/}) == $(ipcalc -n ${A_SUBNET}) ];then
        FLANNEL_SUBNET=$C_SUBNET
        SERVICE_SUBNET=$B_SUBNET
        break
    fi
    if [ $(ipcalc -n $ip/${B_SUBNET#*/}) == $(ipcalc -n ${B_SUBNET}) ];then
        FLANNEL_SUBNET=$A_SUBNET
        SERVICE_SUBNET=$C_SUBNET
        break
    fi
    if [ $(ipcalc -n $ip/${C_SUBNET#*/}) == $(ipcalc -n ${C_SUBNET}) ];then
        FLANNEL_SUBNET=$A_SUBNET
        SERVICE_SUBNET=$B_SUBNET
        break
    fi
done

while ((1));do
    sleep 2
    etcdctl cluster-health
    flag=$?
    if [ $flag == 0 ];then
etcdctl mk /coreos.com/network/config '{"Network":"'${FLANNEL_SUBNET}'"}'
        break
    fi
done

echo '################ Starting flannel...'
echo -e "FLANNEL_ETCD=\"http://192.168.0.164:2379,http://192.168.0.165:2379,http://192.168.0.167:2379\"
FLANNEL_ETCD_KEY=\"/coreos.com/network\"" > /etc/sysconfig/flanneld
systemctl enable flanneld
systemctl start flanneld

echo '################ Installing K8S...'
yum -y install kubernetes
echo 'KUBE_API_ADDRESS="--address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet_port=10250"
KUBE_ETCD_SERVERS="--etcd_servers=http://192.168.0.164:2379,http://192.168.0.165:2379,http://192.168.0.167:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range='${SERVICE_SUBNET}'"
KUBE_ADMISSION_CONTROL="--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
KUBE_API_ARGS=""' > /etc/kubernetes/apiserver

echo '################ Start K8S components...'
for SERVICES in kube-apiserver kube-controller-manager kube-scheduler; do
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES
done

#!/bin/bash

echo '################ Prerequisites...'
#关闭firewall 开启ntp时间同步
systemctl stop firewalld
systemctl disable firewalld
yum -y install ntp
systemctl start ntpd
systemctl enable ntpd

#安装kubernetes所需要的几个软件
yum -y install kubernetes docker flannel bridge-utils

#此处使用了一个vip 命名为vip 实际部署时需要替换为你的集群的vip 使用此ip的服务有 kube-master（8080） registry（5000） skydns（53）

echo '################ Configuring nodes...'
echo '################ Configuring nodes > Find Kube master...'
KUBE_REGISTRY_IP="192.168.0.169"
KUBE_MASTER_IP="192.168.0.170"
echo '################ Configuring nodes > Configuring Minion...'
echo -e "KUBE_LOGTOSTDERR=\"--logtostderr=true\"
KUBE_LOG_LEVEL=\"--v=0\"
KUBE_ALLOW_PRIV=\"--allow_privileged=false\"
KUBE_MASTER=\"--master=http://${KUBE_MASTER_IP}:8080\"" > /etc/kubernetes/config
echo '################ Configuring nodes > Configuring kubelet...'
#取每个node机器的eth0的ip作为标识
KUBE_NODE_IP=`ifconfig eth0 | grep "inet " | awk '{print $2}'`

#api_servers 使用master1 master2 master3的ip数组形式
echo -e "KUBELET_ADDRESS=\"--address=0.0.0.0\"
KUBELET_PORT=\"--port=10250\"
KUBELET_HOSTNAME=\"--hostname_override=${KUBE_NODE_IP}\"
KUBELET_API_SERVER=\"--api_servers=http://192.168.0.164:8080,http://192.168.0.165:8080,http://192.168.0.167:8080\"
KUBELET_ARGS=\"--cluster-dns=vip --cluster-domain=k8s --pod-infra-container-image=${KUBE_REGISTRY_IP}:5000/pause:latest\"" > /etc/kubernetes/kubelet

#flannel读取etcd配置信息 为本机的docker0分配ip 保证node集群子网互通
echo '################ Configuring flannel...'
echo -e "FLANNEL_ETCD=\"http://192.168.0.162:2379,http://192.168.0.165:2379,http://192.168.0.167:2379\"
FLANNEL_ETCD_KEY=\"/coreos.com/network\"" > /etc/sysconfig/flanneld

echo '################ Accept private registry...'
echo "OPTIONS='--selinux-enabled --insecure-registry ${KUBE_REGISTRY_IP}:5000'
DOCKER_CERT_PATH=/etc/docker" > /etc/sysconfig/docker

echo '################ Start K8S Components...'
systemctl daemon-reload
for SERVICES in kube-proxy flanneld; do
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES
done

echo '################ Resolve interface conflicts...'
systemctl stop docker
ifconfig docker0 down
brctl delbr docker0

echo '################ Accept private registry...'
echo -e "OPTIONS='--selinux-enabled --insecure-registry ${KUBE_REGISTRY_IP}:5000'
DOCKER_CERT_PATH=/etc/docker" > /etc/sysconfig/docker

for SERVICES in docker kubelet; do
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES
done