Kubernetes集群部署文档

 

官网文档：https://kubernetes.io/docs/getting-started-guides/centos/centos_manual_config/

 

Kubernetes包提供了几个服务：kube-apiserver，kube-scheduler，kube-controller-manager，kubelet，kube-proxy。这些服务由systemd管理，配置文件位置：/etc/kubernetes。我们通过kubernetes实现跨主机。第一个主机，centos-master，将是Kubernetes管理。这个主机将运行kube-apiserver，kube-controller-manager和kube-scheduler，也将运行etcd。其余主机，centos-minion-n将是节点并运行kubelet，etcd，cadector和docker。

所有节点都运行flanneld作为网络覆盖。

 

准备环境：

准备三台centos7主机，请将主机IP替换为您的环境。

centos-master = 192.168.2.68

centos-minion = 192.168.2.78

 

禁用主节点和所有节点上的防火墙，因为docker与其他防火墙规则管理器不能很好地工作。CentOS不会让你禁用防火墙，只要SELinux强制，所以需要先禁用。

setenforce 0

vim /etc/selinux/config

SELINUX=disabled

systemctl disable iptables-services firewalld

systemctl stop iptables-services firewalld

 

官方配置centos的yum源为docker官方源，也可以不配置，使用默认的centos源

# vim /etc/yum.repos.d/virt7-docker-common-release.repo（所有主机上）

[virt7-docker-common-release]

name=virt7-docker-common-release

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

gpgcheck=0

 

 

配置主机名，也可以不配置，使用ip来管理

# vim /etc/hosts（所有主机上）

或

echo "192.168.2.68 centos-master

192.168.2.78 centos-minion" >> /etc/hosts

 

安装

所有的主机通过yum安装下列服务，如果使用centos源，请将红色部分去掉。其实一样，装出来都是1.4.0+1.12.5

# yum -y install --enablerepo=virt7-docker-common-release etcd flannel kubernetes（所有主机上）

# yum -y install etcd flannel kubernetes

配置

#vim /etc/kubernetes/config（所有节点）

# 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://centos-master:8080"

 

 

# vim /etc/etcd/etcd.conf（master）

# [member]

ETCD_NAME=default

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"

#[cluster]

ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"

 

Default可以改掉 dir也可以改会自动创建

 

 

# vim /etc/kubernetes/apiserver（master） 一定把多余的去掉，尤其是认证那块

# 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://centos-master: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=""

 

<!--[if !supportLists]-->·         <!--[endif]-->警告此网络必须在网络基础设施中未使用！172.30.0.0/16在我们的网络是没有用过的

 

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\" } }"

 

# vim /etc/sysconfig/flannel（master）

# Flanneld configuration options

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

FLANNEL_ETCD_ENDPOINTS="http://centos-master: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=""

 

 

# vim /etc/kubernetes/kubelet（minion）

# 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=centos-minion-n"

# Location of the api-server

KUBELET_API_SERVER="--api-servers=http://centos-master:8080"

# Add your own!

KUBELET_ARGS=""

 

# vim /etc/sysconfig/flanneld（minion）

# Flanneld configuration options

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

FLANNEL_ETCD_ENDPOINTS="http://centos-master: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=""

 

 

 

 

master 启动脚本

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

 

 

minion启动脚本

for SERVICES in kube-proxy kubelet flanneld docker; do

    systemctl restart $SERVICES

    systemctl enable$SERVICES

    systemctl status $SERVICES

done

 

 

验证

$ kubectl get nodes

NAME                   LABELS            STATUS

centos-minion        <none>            Ready