Centos7搭建kubernetes搭建

安装前的准备工作：

Kubernetes包提供了一些服务：kube-apiserver，kube-scheduler，kube-controller-manager，kubelet，kube-proxy。 这些服务由systemd管理，配置位于：/etc/kubernetes。

Kubernetes master 将会跑这些服务：kube-apiserver, kube-controller-manager ，kube-scheduler和etcd。 kubernates工作节点跑的服务有：kubelet, proxy, cadvisor and docker。 所有节点都会起flanneld实现跨主机网络。

二.准备三台电脑

master：192.168.0.5

node1：192.168.0.6

node2：192.168.0.7

三.卸载系统自带docker

yum list installed | grep docker

yum remove -y docker.x86_64 docker-client.x86_64 docker-common.x86_64

四。关闭防火墙

systemctl disable iptables-services firewalld

systemctl stop iptables-services firewalld

五。安装配置Kubernetes

sh -x k8s-master.sh 172.31.17.187

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#!/usr/bin/env bash

set -e

 

MASTER_IP=$1

if [ ! $MASTER_IP ]

then

echo "MASTER_IP is null"

exit 1

fi

 

echo "=================install ntpd==================="

yum -y install ntp

systemctl start ntpd

systemctl enable ntpd

 

echo "=================install docker, k8s, etcd, flannel==================="

cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo

[virt7-docker-common-release]

name=virt7-docker-common-release

baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/

gpgcheck=0

EOF

 

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

 

echo "=================config kubernetes==================="

mv /etc/kubernetes/config /etc/kubernetes/config.bak

cat <<EOF >/etc/kubernetes/config

# logging to stderr means we get it in the systemd journal

KUBE_LOGTOSTDERR="--logtostderr=true"

 

# journal message level, 0 is debug

KUBE_LOG_LEVEL="--v=0"

 

# Should this cluster be allowed to run privileged docker containers

KUBE_ALLOW_PRIV="--allow-privileged=false"

 

# How the replication controller and scheduler find the kube-apiserver

KUBE_MASTER="--master=http://${MASTER_IP}:8080"

EOF

 

setenforce 0

#systemctl disable iptables-services firewalld

#systemctl stop iptables-services firewalld

 

echo "================= config etcd======================"

sed -i s#'ETCD_LISTEN_CLIENT_URLS="http://localhost:2379"'#'ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"'#g /etc/etcd/etcd.conf

sed -i s#'ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"'#'ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"'#g /etc/etcd/etcd.conf

 

echo "================= config apiserver==================="

mv /etc/kubernetes/apiserver /etc/kubernetes/apiserver.bak

cat <<EOF >/etc/kubernetes/apiserver

# The address on the local server to listen to.

KUBE_API_ADDRESS="--address=0.0.0.0"

 

# The port on the local server to listen on.

KUBE_API_PORT="--port=8080"

 

# Port kubelets listen on

KUBELET_PORT="--kubelet-port=10250"

 

# Comma separated list of nodes in the etcd cluster

KUBE_ETCD_SERVERS="--etcd-servers=http://${MASTER_IP}:2379"

 

# Address range to use for services

KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

 

# Add your own!

KUBE_API_ARGS=""

EOF

 

echo "=================start and set etcd==============="

systemctl start etcd

etcdctl mkdir /kube-centos/network

etcdctl mk /kube-centos/network/config "{ \"Network\": \"172.30.0.0/16\", \"SubnetLen\": 24, \"Backend\": { \"Type\": \"vxlan\" } }"

 

echo "=================config flannel==================="

mv /etc/sysconfig/flanneld /etc/sysconfig/flanneld.bak

cat <<EOF >/etc/sysconfig/flanneld

# Flanneld configuration options

 

# etcd url location. Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="http://${MASTER_IP}:2379"

 

# etcd config key. This is the configuration key that flannel queries

# For address range assignment

FLANNEL_ETCD_PREFIX="/kube-centos/network"

 

# Any additional options that you want to pass

#FLANNEL_OPTIONS=""

EOF

 

echo "=================start etcd k8s ==================="

for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler flanneld ; do

systemctl restart $SERVICES

systemctl enable $SERVICES

systemctl status $SERVICES

done

-------------------------------------------------------------------------------------------------------------------------------

注： 上面脚本并没有启动docker和kublet，如果测试时需要在master上运行服务，请启动docker，并按照node的kublet配置并启动kublet。

六。安装node

sh install-k8s-node.sh 172.31.17.187 172.31.25.80 # master_ip node_ip

 

------------------------------------------------------------------------------------------------------------------------------------------------------

#/usr/bin/env bash

set -e

 

MASTER_IP=$1

NODE_IP=$2

if [ ! $MASTER_IP ] || [ ! $NODE_IP ]

then

echo "MASTER_IP or NODE_IP is null"

exit 1

fi

 

echo '=================install ntpd==================='

yum -y install ntp

systemctl start ntpd

systemctl enable ntpd

 

echo "=================install docker, k8s, etcd, flannel==================="

cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo

[virt7-docker-common-release]

name=virt7-docker-common-release

baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/

gpgcheck=0

EOF

 

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

 

setenforce 0

 

echo "===============config kubernetes================"

mv /etc/kubernetes/config /etc/kubernetes/config.bak

cat <<EOF >/etc/kubernetes/config

# logging to stderr means we get it in the systemd journal

KUBE_LOGTOSTDERR="--logtostderr=true"

 

# journal message level, 0 is debug

KUBE_LOG_LEVEL="--v=0"

 

# Should this cluster be allowed to run privileged docker containers

KUBE_ALLOW_PRIV="--allow-privileged=false"

 

# How the replication controller and scheduler find the kube-apiserver

KUBE_MASTER="--master=http://${MASTER_IP}:8080"

EOF

 

echo "===============install docker, k8s, etcd, flannel================"

cat <<EOF > /etc/yum.repos.d/virt7-docker-common-release.repo

[virt7-docker-common-release]

name=virt7-docker-common-release

baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/

gpgcheck=0

EOF

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

 

echo "===============config kublet================"

mv /etc/kubernetes/kubelet /etc/kubernetes/kubelet.bak

cat <<EOF >/etc/kubernetes/kubelet

# The address for the info server to serve on

KUBELET_ADDRESS="--address=0.0.0.0"

 

# The port for the info server to serve on

KUBELET_PORT="--port=10250"

 

# You may leave this blank to use the actual hostname

# Check the node number!

KUBELET_HOSTNAME="--hostname-override=${NODE_IP}"

 

# Location of the api-server

KUBELET_API_SERVER="--api-servers=http://${MASTER_IP}:8080"

 

# Add your own!

KUBELET_ARGS=""

EOF

 

echo "===============config flanneld================"

mv /etc/sysconfig/flanneld /etc/sysconfig/flanneld.bak

cat <<EOF >/etc/sysconfig/flanneld

# Flanneld configuration options

 

# etcd url location. Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="http://${MASTER_IP}:2379"

 

# etcd config key. This is the configuration key that flannel queries

# For address range assignment

FLANNEL_ETCD_PREFIX="/kube-centos/network"

 

# Any additional options that you want to pass

#FLANNEL_OPTIONS=""

EOF

 

echo "==========start kube-proxy kubelet flanneld docker==========="

for SERVICES in kube-proxy kubelet flanneld docker; do

systemctl restart $SERVICES

systemctl enable $SERVICES

systemctl status $SERVICES

done

 

echo "==============set kubectl================"

kubectl config set-cluster default-cluster --server=http://${MASTER_IP}:8080

kubectl config set-context default-context --cluster=default-cluster --user=default-admin

kubectl config use-context default-context

-------------------------------------------------------------------------------------------------------------------------------------------

查看节点状态

$ kubectl get no

NAME STATUS AGE

NAME STATUS AGE

172.31.16.52 Ready 1h

172.31.25.80 Ready 2h

------------------------------------------------------------------------------------------------------------------------------------------------------

测试服务器

测试通过master部署两个nginx到node。
在master上新建文件nginx-deployment.yml

-------------------------------------------------------------------------------------------------------------------------------------------------------------

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

name: nginx-deployment

spec:

replicas: 2 # tells deployment to run 2 pods matching the template

template: # create pods using pod definition in this template

metadata:

# unlike pod-nginx.yaml, the name is not included in the meta data as a unique name is

# generated from the deployment name

labels:

app: nginx

spec:

containers:

- name: nginx

image: nginx:1.7.9

ports:

- containerPort: 80

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

创建deployment

$ kubectl create -f nginx-deployment.yml

deployment "nginx-deployment" created

查看pod：

$ kubectl get pods -o wide

NAME READY STATUS RESTARTS AGE IP NODE

nginx-deployment-4087004473-kbbgs 1/1 Running 0 1h 172.30.41.2 172.31.25.80

nginx-deployment-4087004473-m47bg 1/1 Running 0 1h 172.30.93.2 172.31.16.52

 

# 访问nginx

$curl 172.30.41

<!DOCTYPE html>

<html>

<head>

<title>Welcome to nginx!</title>

<style>

body {

width: 35em;

margin: 0 auto;

font-family: Tahoma, Verdana, Arial, sans-serif;

}

</style>

</head>

<body>

<h1>Welcome to nginx!</h1>

<p>If you see this page, the nginx web server is successfully installed and

working. Further configuration is required.</p>

 

<p>For online documentation and support please refer to

<a href="http://nginx.org/">nginx.org</a>.<br/>

Commercial support is available at

<a href="http://nginx.com/">nginx.com</a>.</p>

 

<p><em>Thank you for using nginx.</em></p>

</body>

</html>

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如果发现STATUS一直处于ContainerCreating状态，可能是正在拉取镜像。可以查看详细信息.