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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-apiserverkube-schedulerkube-controller-managerkubeletkube-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-apiserverkube-controller-managerkube-scheduler,也将运行etcd。其余主机,centos-minion-n将是节点并运行kubeletetcdcadectordocker

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centosyum源为docker官方源,也可以不配置,使用默认的centos

# 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

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.confmaster

# [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/apiservermaster) 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/flannelmaster

# 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/kubeletminion

# 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/sysconf/flannelminion

# 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