Kubernates集群入门（1）

阅读原文：http://click.aliyun.com/m/22408/
摘要： 一、K8s安装准备 1.至少两台主机，一台作为master，一台作为node。两台主机需要关闭防火墙。 #centos6 service stop firewalld && service disable firewalld #centos7 systemctl stop iptables && systemctl disable iptables; 2.

一、K8s安装准备

1.至少两台主机，一台作为master，一台作为node。两台主机需要关闭防火墙。

#centos6
service stop firewalld  && service disable firewalld
#centos7
systemctl stop iptables && systemctl disable iptables;
2.两台机器需要各自编辑/etc/hosts文件，互相添加hostname，然后相互ping通，以下为例

echo "192.168.18.128 centos-master
192.168.18.130 centos-minion
" >> /etc/hosts
二、K8s的安装

1.两台主机都需要安装docker，kubernetes，如有docker版本冲突需要卸载重新安装docker.

yum -y install docker kubernetes
2.master节点需要安装etcd数据库服务，etcd作为kubernetes的数据库

yum -y install etcd
3.每个节点修改kubernetes配置文件

vim /etc/kubernetes/config

# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://centos-master:8080"
KUBE_ETCD_SERVERS="--etcd_servers=http://centos-master:4001"

4.master节点上，配置api服务给node

vim /etc/kubernetes/apiserver

# The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"
KUBE_API_PORT="--port=8080"
# Comma separated list of nodes in the etcd cluster
#KUBE_ETCD_SERVERS="--etcd_servers=http://127.0.0.1:2379"

5.master节点上编写启动相关kubernetes服务的脚本

vim k8s-up.sh

#!/bin/bash

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

查看服务状态的脚本

vim k8s-stat.sh

#!/bin/bash

for SERVICES in etcd kube-apiserver kube-controllermanager
kube-scheduler; do
systemctl status $SERVICES
done
6.node节点修改/etc/kubernetes/kubelet，配置与master的连接

###
# kubernetes kubelet (minion) config
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname_override=centos-minion"
KUBELET_API_SERVER="--api_servers=http://centos-master:8080“
# Add your own!
KUBELET_ARGS=""
7.node节点编写启动和查看服务脚本

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

for SERVICES in kube-proxy kubelet docker; do
systemctl status $SERVICES
done
8.node节点查看是否成功注册到master节点，如果没关闭防火墙会报错

tail -f /var/log/messages |grep kube
9.master节点查看刚才注册的节点，节点status为ready为正常

kubectl get nodes
10.kubectl是master端的交互工具，可以通过子命令查看节点等信息

kubectl get nodes #获取节点列表

kubectl cluster-info #查看节点信息
----
**下一节演示一个简单的kubernetes实例，master节点通过yaml文件，让node节点自动pull镜像并运行。**
阅读原文：http://click.aliyun.com/m/22408/