平台环境：Centos 7.0
一、架构模式
二、核心服务
Master
1）etcd服务
etcd是一个高可用的键值存储系统，Kubernetes使用它来存储各个资源的状态，从而实现了Restful的API。etcd服务作为kubernetes集群的主数据库，在安装Kubernetes各服务之前需要先安装和启动。
2）kube-apiserver
APIserver负责对外提供RESTful的kubernetes API的服务，它是系统管理指令的统一接口，任何对资源的增删改查都要交给APIserver处理钴在交给etcd。
3）schedule
schedule负责调度Pod到合适的Node上。
4）controller manager
controller在kubernetes中担任资源控制器功能。
Node
kube-proxy：该模块实现了kubernetes中的服务发现和反向代理功能。kube-proxy支持TCP和UDP连接转发，默认基Round Robin算法将客户端流量转发到与service对应的一组后端pod.服务发现方面，kube-proxy使用etcd的watch机制监控集群中service和endpoint对象数据的动态变化，并且维护一个service到endpoint的映射关系，从页保证了后端pod的IP变化不会对访问者造成影响。kube-proxy还支持session affinity。
kublet：kublet是Master在每个Node节点上面的agent，是Node节点上面最重要的模块，它负责维护和管理该Node上的所有容器，但是如果容器不是通过kubernetes创建的，它并不会管理。本质上，它负责使Pod的运行状态与期望的状态一致。
三、部署安装
服务器分配
master:192.168.56.155
node1:192.168.56.163
Master
1、安装
yum -y install etcd kubernetes-master
2、配置etcd服务
systemd服务文件:/usr/lib/systemd/system/etcd.service [Unit] Description=Etcd Server After=network.target [Service] Type=notify WorkingDirectory=/var/lib/etcd/ EnvironmentFile=-/etc/etcd/etcd.conf User=root # set GOMAXPROCS to number of processors ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name="${ETCD_NAME}" --data-dir="${ETCD_DATA_DIR}" --listen-client-urls="${ETCD_LISTEN_CLIENT_URLS}"" Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target
服务配置文件:/etc/etcd/etcd.conf(修改这四项)
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="default"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.56.155:2379"
3、配置kube-apiserver
systemd配置文件：/usr/lib/systemd/system/kube-apiserver.service [Unit] Description=Kubernetes API Server Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=network.target After=etcd.service Wants=etcd.service [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/apiserver User=root ExecStart=/usr/bin/kube-apiserver $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBE_ETCD_SERVERS $KUBE_API_ADDRESS $KUBE_API_PORT $KUBELET_PORT $KUBE_ALLOW_PRIV $KUBE_SERVICE_ADDRESSES $KUBE_ADMISSION_CONTROL $KUBE_API_ARGS Restart=on-failure Type=notify LimitNOFILE=65536 [Install] WantedBy=multi-user.target
服务配置文件：/etc/kubernetes/apiserver
###
# kubernetes system config
#
# The following values are used to configure the kube-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 minions listen on
KUBELET_PORT="--kubelet-port=10250"
# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.56.155:2379"
# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
# default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
# Add your own!
KUBE_API_ARGS=""
4、配置kube-scheduler.service
systemd配置文件：/usr/lib/systemd/system/kube-scheduler.service [Unit] Description=Kubernetes Scheduler Plugin Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=etcd.service After=kube-apiserver.service Requires=etcd.service Requires=kube-apiserver.service [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/scheduler User=root ExecStart=/usr/bin/kube-scheduler $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBE_MASTER $KUBE_SCHEDULER_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target
服务配置文件：/etc/kubernetes/scheduler
###
# kubernetes scheduler config
# default config should be adequate
# Add your own!
KUBE_SCHEDULER_ARGS=""
5、配置kube-controller-manager
systemd配置文件：/usr/lib/systemd/system/kube-controller-manager.service [Unit] Description=Kubernetes Controller Manager Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=etcd.service After=kube-apiserver.service Requires=etcd.service Requires=kube-apiserver.service [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/controller-manager User=root ExecStart=/usr/bin/kube-controller-manager $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBE_MASTER $KUBE_CONTROLLER_MANAGER_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target
服务配置文件:/etc/kubernetes/controller-manager
###
# The following values are used to configure the kubernetes controller-manager
# defaults from config and apiserver should be adequate
# Add your own!
KUBE_CONTROLLER_MANAGER_ARGS=""
6、启动服务
for i in {"etcd.service","kube-apiserver.service","kube-scheduler.service","kube-controller-manager.service"};do systemctl enable $i;done for i in {"etcd.service","kube-apiserver.service","kube-scheduler.service","kube-controller-manager.service"};do systemctl start $i;done
Node
1、安装
yum -y install kubernetes-node
2、配置kubelet
systemd配置文件：/usr/lib/systemd/system/kubelet.service [Unit] Description=Kubernetes Kubelet Server Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=docker.service Requires=docker.service [Service] WorkingDirectory=/var/lib/kubelet EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/kubelet ExecStart=/usr/bin/kubelet $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBELET_API_SERVER $KUBELET_ADDRESS $KUBELET_PORT $KUBELET_HOSTNAME $KUBE_ALLOW_PRIV $KUBELET_POD_INFRA_CONTAINER $KUBELET_ARGS Restart=on-failure KillMode=process [Install] WantedBy=multi-user.target
服务配置文件：/etc/kubernetes/kubelet
###
# kubernetes kubelet (minion) config
# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=127.0.0.1"
# The port for the info server to serve on
KUBELET_PORT="--port=10250"
# You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname-override=nginx2"
# location of the api-server
KUBELET_API_SERVER="--api-servers=http://192.168.56.155:8080"
# pod infrastructure container
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
# Add your own!
KUBELET_ARGS=""
3、配置kube-proxy
systemd配置文件：/usr/lib/systemd/system/kube-proxy.service [Unit] Description=Kubernetes Kube-Proxy Server Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=network.target [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/proxy ExecStart=/usr/bin/kube-proxy $KUBE_LOGTOSTDERR $KUBE_LOG_LEVEL $KUBE_MASTER $KUBE_PROXY_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target 服务配置文件：vim /etc/kubernetes/proxy ### # kubernetes proxy config # default config should be adequate # Add your own! KUBE_PROXY_ARGS=""
4、启动服务
for i in {"etcd.service","kube-apiserver.service","kube-scheduler.service","kube-controller-manager.service"};do systemctl enable $i;done for i in {"etcd.service","kube-apiserver.service","kube-scheduler.service","kube-controller-manager.service"};do systemctl start $i;done
四、检查
[root@master kubernetes]# kubectl get nodes NAME STATUS AGE node1 Ready 3h
文献：https://blog.csdn.net/chenmeng729970897/article/details/76269853