kubernetes系列（一）安装和配置

   谈到kubernetes（或者说k8s）不得不提到云计算、虚拟化以及容器技术，相关介绍网上一大堆，不再赘述。而kubernetes的出现就是为了高效的管理云端运行的docker容器。

环境

docker 1.30  ----------docker的安装请参考官方文档

golang 1.8.3 ----------自行百度

etcd 3.2.5 --------------安装文档参考官方文档

kubernetes 1.6.8 ---稍后介绍

部署方案

master+etcd    10.0.45.44

node1          10.0.48.50

node2          10.0.48.59

安装和配置

从github.com/kubernetes/kubernetes上下载1.6.8已编译好的二进制文件

tar xzvf kubernetes.tar.gz
cd kubernetes

./cluster/get-kube-binaries.sh

执行该shell会自动下载kube的server和client可执行文件，其中客户端文件会自动安装在kubernetes目录下的client文件夹下，服务端文件会安装在kubernetes/server/kubernetes/server/bin/下面（包含客户端文件)

master节点需要：kube-apiserver, kube-controller-manager, kube-scheduler

node节点需要：kubelet和kube-proxy

这些程序我们通过systemctl的方式来进行管理（包括etcd）

1、master配置

kube-etcd.service

[Unit]
Description=Kube-etcd Service
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd 
    --name "etcd1" 
    --data-dir="~/.k8s/etcd" 
    --listen-client-urls="http://10.0.45.44:2379,http://127.0.0.1:2379" 
    --listen-peer-urls="http://10.0.45.44:2380" 
    --advertise-client-urls="http://10.0.45.44:2379" 
    --initial-advertise-peer-urls="http://10.0.45.44:2380" 
    --initial-cluster="etcd1=http://10.0.45.44:2380" 
    --initial-cluster-state="new"    

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

kube-apiserver.service

[Unit]
Description=Kube-apiserver Service
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/kube-apiserver 
            --admission-control=NamespaceAutoProvision,LimitRanger,SecurityContextDeny 
            --apiserver-count=1 
            --cors-allowed-origins=.* 
            --enable-garbage-collector=false 
            --etcd-servers=http://10.0.45.44:2379 
            --insecure-bind-address=0.0.0.0 
            --insecure-port=8080 
            --log-dir=~/.kube/log/kube-apiserver 
            --logtostderr=false 
            --service-cluster-ip-range=10.0.0.0/16 
            --v=5 

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

kube-controller-manager.service

[Unit]
Description=Kube-controller-manager Service
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/kube-controller-manager 
          --enable-garbage-collector=false 
          --logtostderr=false 
          --log-dir=~/.kube/log/kube-controller-manager 
          --pod-eviction-timeout=5m0s 
          --master=http://0.0.0.0:8080 
          --node-monitor-grace-period=40s 
          --terminated-pod-gc-threshold=12500 
          --leader-elect=true 
          --v=4 

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

kube-scheduler.service

[Unit]
Description=Kube-scheduler Service
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/kube-scheduler 
            --log-dir=~/.k8s/log/kube-scheduler 
            --logtostderr=false 
            --master=http://0.0.0.0:8080 
            --leader-elect=true 
            --v=5 

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

注意修改自己的IP地址，下面启动服务……

//add to path

cd etcd-v3.2.5-linux-amd64; sudo cp -rf etcd /usr/local/bin
cd kubernetes/server/kubernetes/server/bin/; sudo cp -rf kube-apiserver kube-controller-manager kube-scheduler kubectl /usr/local/bin
sudo cp -rf kube-etcd.service kube-apiserver.service kube-controller-manager.service kube-scheduler.service /lib/systemd/system/

//start server

sudo -i
systemctl --system daemon-reload
systemctl start kube-apiserver.service
systemctl start kube-controller-manager.service
systemctl start kube-scheduler.service

 2. node  1

kubelet.service

[Unit]
Description=Kubelet Service
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/kubelet 
            --api-servers=http://10.0.45.44:8080 
            --hostname-override=10.0.48.50 
            --image-gc-high-threshold=80 
            --image-gc-low-threshold=50 
            --log-dir=~/.k8s/log/kubelet 
            --logtostderr=false 
            --pod-infra-container-image=docker.cloudin.com/google_containers/pause-amd64:3.0 
            --system-reserved cpu=2000m,memory=4G 
            --v=5 

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

kube-proxy.service

[Unit]
Description=Kube-proxy Service
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/bin/kube-proxy  
            --log-dir=~/.k8s/log/kube-proxy 
            --logtostderr=false 
            --master=http://10.0.48.50:8080 
            --v=5 

Restart=always
LimitNOFILE=65536

[Install]
WantedBy=default.target

node 2需要将相应ip地址中的10.0.48.50改为10.0.48.59
下面启动服务……

//add to path
cd kubernetes/server/kubernetes/server/bin/; sudo cp -rf kubelet kube-proxy /usr/local/bin
sudo cp -rf kubelet.service kube-proxy.service /lib/systemd/system/

//start
sudo -i
systemctl --system daemon-reload
systemctl start kubelet.service
systemctl start kube-proxy.service

 3、测试环境是否搭建成功

$kubectl get nodes
NAME         STATUS     AGE       VERSION
10.0.48.50   NotReady   1h        v1.6.8
10.0.48.59   Ready      1h        v1.6.8


$kubectl get service
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.0.0.1 <none> 443/TCP 1h

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