一、下载Kubernetes(简称K8S)二进制文件,和 docker 离线包

下载离线docker安装包:

docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm
docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm

1)https://github.com/kubernetes/kubernetes/releases 
从上边的网址中选择相应的版本,本文以1.9.1版本为例,从 CHANGELOG页面 下载二进制文件。

kubernetes centos7 kubernetes centos7离线安装_kubernetes centos7

2)组件选择:选择Service Binaries中的kubernetes-server-linux-amd64.tar.gz 

该文件已经包含了 K8S所需要的全部组件,无需单独下载Client等组件。 

kubernetes centos7 kubernetes centos7离线安装_kubernetes centos7_02


二、安装规划 

1)下载K8S解压,把每个组件依次复制到/usr/bin目录文件下,然后创建systemd服务文见,最后启动该组件 

3) 本例:以三个节点为例。具体节点安装组件如下

节点IP地址

角色

安装组件名称

192.168.137.3

Master(管理节点)

etcd、kube-apiserver、kube-controller-manager、kube-scheduler

192.168.137.4

Node1(计算节点)

docker 、kubelet、kube-proxy

192.168.137.5

Node2(计算节点)

docker 、kubelet、kube-proxy

其中etcd为K8S数据库

三、Master节点部署 
注意:在CentOS7系统 以二进制文件部署,所有组件都需要4个步骤: 
1)复制对应的二进制文件到/usr/bin目录下 
2)创建systemd service启动服务文件 
3)创建service 中对应的配置参数文件 
4)将该应用加入到开机自启

1 etcd数据库安装 
(1) ectd数据库安装 
下载:K8S需要etcd作为数据库。以 v3.2.9为例,下载地址如下: 
https://github.com/coreos/etcd/releases/ 
下载解压后将etcd、etcdctl二进制文件复制到/usr/bin目录

(2)设置 etcd.service服务文件 
在/etc/systemd/system/目录里创建etcd.service,其内容如下: 

[root@k8s-master]# cat /etc/systemd/system/etcd.service
[Unit]
Description=etcd.service
[Service]
Type=notify
TimeoutStartSec=0
Restart=always
WorkingDirectory=/var/lib/etcd
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd 
[Install]
WantedBy=multi-user.target

 其中WorkingDirectory为etcd数据库目录,需要在etcd**安装前创建** 

(3)创建配置/etc/etcd/etcd.conf文件 
[root@k8s-master]# cat /etc/etcd/etcd.conf

ETCD_NAME=ETCD Server
ETCD_DATA_DIR="/var/lib/etcd/"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.137.3:2379"

  (4)配置开机启动

#systemctl daemon-reload
#systemctl enable etcd.service
#systemctl start etcd.service

  (5)检验etcd是否安装成功

# etcdctl cluster-health
\member 8e9e05c52164694d is healthy: got healthy result from http://localhost:2379

  2 kube-apiserver服务 
(1)复制二进制文件到/usr/bin目录 
将kube-apiserver、kube-controller-manger、kube-scheduler 三个可执行文件复制到/usr/bin目录 
(2)新建并编辑/kube-apiserver.service 文件 
[root@k8s-master]#cat /usr/lib/systemd/system/kube-apiserver.service

[Unit]
Description=Kubernetes API Server
After=etcd.service
Wants=etcd.service

[Service]
EnvironmentFile=/etc/kubernetes/apiserver
ExecStart=/usr/bin/kube-apiserver  \
        $KUBE_ETCD_SERVERS \
        $KUBE_API_ADDRESS \
        $KUBE_API_PORT \
        $KUBE_SERVICE_ADDRESSES \
        $KUBE_ADMISSION_CONTROL \
        $KUBE_API_LOG \
        $KUBE_API_ARGS 
Restart=on-failure
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

  3)新建参数配置文件/etc/kubernetes/apiserver 
[root@k8s-master]#cat /etc/kubernetes/apiserver

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--insecure-port=8080"
KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.137.5:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=169.169.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_API_LOG="--logtostderr=false --log-dir=/home/k8s-t/log/kubernets --v=2"
KUBE_API_ARGS=" "

  

3 kube-controller-manger部署

(1)配置kube-controller-manager systemd 文件服务 
命令内容如下: 
[root@k8s-master]#cat /usr/lib/systemd/system/kube-controller-manager.service

[Unit]
Description=Kubernetes Scheduler
After=kube-apiserver.service 
Requires=kube-apiserver.service

[Service]
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/bin/kube-controller-manager \
        $KUBE_MASTER \
        $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

  2)配置参数文件 /etc/kubernetes/controller-manager 内容如下: 
[root@k8s-master]#cat /etc/kubernetes/controller-manager \

KUBE_MASTER="--master=http://192.168.137.5:8080"
KUBE_CONTROLLER_MANAGER_ARGS=" "

  

4 kube-scheduler组件部署

(1)配置kube-scheduler systemd服务文件 
[root@k8s-master]#cat /usr/lib/systemd/system/kube-scheduler.service

[Unit]
Description=Kubernetes Scheduler
After=kube-apiserver.service 
Requires=kube-apiserver.service

[Service]
User=root
EnvironmentFile=-/etc/kubernetes/scheduler
ExecStart=/usr/bin/kube-scheduler \
        $KUBE_MASTER \
        $KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

  (2)配置/etc/kubernetes/scheduler参数文件 
[root@k8s-master]#cat /etc/kubernetes/scheduler

KUBE_MASTER="--master=http://192.168.137.5:8080"
KUBE_SCHEDULER_ARGS="--logtostderr=true --log-dir=/home/k8s-t/log/kubernetes --v=2"

  5 将各组件加入开机自启 
(1)命令如下:

systemctl daemon-reload 
systemctl enable kube-apiserver.service
systemctl start kube-apiserver.service
systemctl enable kube-controller-manager.service
systemctl start kube-controller-manager.service
systemctl enable kube-scheduler.service
systemctl start kube-scheduler.service

  

至此,k8smaster节点安装完毕

Master一键重启服务:

for i in etcd kube-apiserver kube-controller-manager kube-scheduler docker;do systemctl restart $i;done

====================================


Node节点安装:

Node节点安装需要复制kubernetes/service/bin的kube-proxy,kubelet到/usr/bin/目录下,

安装离线docker安装包

yum localinstall docler*

  1.    安装kube-proxy服务

(1)添加/usr/lib/systemd/system/kube-proxy.service文件,内容如下:

[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

  2)创建/etc/kubernetes目录

mkdir -p /etc/kubernetes

  3)添加/etc/kubernetes/proxy配置文件

        vim /etc/kubernetes/proxy,内容如下:

KUBE_PROXY_ARGS=""

  (4)添加/etc/kubernetes/config文件

KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=0"

KUBE_ALLOW_PRIV="--allow_privileged=false"

KUBE_MASTER="--master=http://192.168.1.10:8080"

  (5)启动kube-proxy服务

systemctl daemon-reload

systemctl start kube-proxy.service

  (6)查看kube-proxy启动状态

[root@server2 bin]# netstat -lntp | grep kube-proxy

tcp         0      0 127.0.0.1:10249    0.0.0.0:*        LISTEN      11754/kube-proxy   

tcp6       0      0 :::10256                :::*               LISTEN      11754/kube-proxy

  2.  安装kubelet服务

(1)    创建/usr/lib/systemd/system/kubelet.service文件

[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/kubelet

ExecStart=/usr/bin/kubelet $KUBELET_ARGS

Restart=on-failure

KillMode=process

 

[Install]

WantedBy=multi-user.target

  (2)    创建kubelet所需文件路径

mkdir -p /var/lib/kubelet

(3)    创建kubelet配置文件

vim /etc/kubernetes/kubelet,内容如下:

KUBELET_HOSTNAME="--hostname-override=192.168.1.128"

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=reg.docker.tb/harbor/pod-infrastructure:latest"

KUBELET_ARGS="--enable-server=true --enable-debugging-handlers=true --fail-swap-on=false --kubeconfig=/var/lib/kubelet/kubeconfig"

  

(4)    添加/var/lib/kubelet/kubeconfig文件

然后还要添加一个配置文件,因为1.9.0在kubelet里不再使用KUBELET_API_SERVER来跟API通信,而是通过别一个yaml的配置来实现。

vim /var/lib/kubelet/kubeconfig ,内容如下:

apiVersion: v1

kind: Config

users:

- name: kubelet

clusters:

- name: kubernetes

  cluster:

    server: http://192.168.1.10:8080

contexts:

- context:

    cluster: kubernetes

    user: kubelet

  name: service-account-context

current-context: service-account-context

  

5)启动kubelet

关闭swap分区:swapoff  -a (不然kubelet启动报错)

systemctl daemon-reload

systemctl start kubelet.service

(6)查看kubelet文件状态

[root@server2 ~]# netstat -lntp | grep kubelet

[root@server2 ~]# netstat -lntp | grep kubelet

tcp        0      0 127.0.0.1:10248     0.0.0.0:*            LISTEN      15410/kubelet      

tcp6       0      0 :::10250                :::*                   LISTEN      15410/kubelet      

tcp6       0      0 :::10255                :::*                   LISTEN      15410/kubelet      

tcp6       0      0 :::4194                 :::*                    LISTEN      15410/kubelet

获取节点:

kubectl get nodes