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-releaseetcd 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=""
·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/sysconf/flannel（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$SERVICESsystemctlenable$SERVICESsystemctl status$SERVICESdone
minion启动脚本
for SERVICES in kube-proxy kubelet flanneld docker; do
systemctl restart$SERVICES
systemctlenable$SERVICES
systemctl status$SERVICES
done
验证
$kubectl get nodes
NAME LABELS STATUS
centos-minion Ready