kubernetes架构部署

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

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