kubernetes 1.13 install

External Dependencies kubernetes

Default etcd server is unchanged at v3.2.24 since Kubernetes 1.12. (#68318)
The list of validated docker versions remain unchanged at 1.11.1, 1.12.1, 1.13.1, 17.03, 17.06, 17.09, 18.06 since

docker install

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum list docker-ce --showduplicates | sort -r
yum -y install docker-ce-18.06.1.ce-3.el7
systemctl start docker
systemctl enable docker

1. 准备阶段

1.1 组建规划

主机名	地址	角色	组件
k8s-m1	10.16.32.85	k8s-master	etcd、kube-apiserver、kube-controller-manager、kube-scheduler
k8s-g1	10.16.32.86	k8s-node	kubelet、docker、kube_proxy
k8s-g2	10.16.32.87	k8s-node	kubelet、docker、kube_proxy

1.2 软件下载

(1) Kubernetes二进制文件下载

https://github.com/kubernetes/kubernetes/releases

https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.13.md#v1130-beta2
从上边的网址中选择相应的版本，从 CHANGELOG页面下载二进制文件，本文以1.13版本为例，

在/root/kubernetes/server/bin 路径下包含一些必须的组件 binary文件如下

(2) etcd数据库下载

https://github.com/coreos/etcd/releases/
这里选用的是最新版本v3.3.10。

2. Master安装

2.1 etcd数据库安装

（1）安装

将下载的etcd文件包进行解压，解压后将etcd、etcdctl二进制文件复制到/usr/bin目录。

（2）设置服务文件etcd.service

在/usr/lib/systemd/system/目录下创建文件etcd.service，内容为：

mkdir /var/lib/etcd/
vim /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Server

[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

（3）创建配置文件/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://10.16.32.85:2379"

（4）配置开机启动并运行

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

（5）检验etcd是否安装成功

etcdctl cluster-health

2.2 kube-apiserver、kube-controller-manager、kube-scheduler服务安装

2.2.1 复制二进制文件到/usr/bin目录

将kube-apiserver、kube-controller-manager、kube-scheduler 三个可执行文件复制到/usr/bin目录

2.2.2 组件安装及配置

2.2.2.1 kube-apiserver

（1）新建并编辑kube-apiserver.service 文件
路径：/usr/lib/systemd/system/kube-apiserver.service，内容为：

[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

其中EnvironmentFile为kube-apiserver的配置文件
（2）配置文件
apiserver配置文件路径为：/etc/kubernetes/apiserver，内容为：

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--insecure-port=8080"
KUBE_ETCD_SERVERS="--etcd-servers=http://10.16.32.85:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=192.168.0.0/16"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"
KUBE_API_LOG="--logtostderr=false --log-dir=/var/log/kubernets/apiserver --v=2"
KUBE_API_ARGS=" "

2.2.2.2 kube-controller-manager

（1）新建并编辑kube-controller-manager.service 文件
路径：/usr/lib/systemd/system/kube-controller-manager.service，内容为：

[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）配置文件
apiserver配置文件路径为：/etc/kubernetes/controller-manager，内容为：

KUBE_MASTER="--master=http://10.16.32.85:8080"
KUBE_CONTROLLER_MANAGER_ARGS=" "

2.2.2.3 kube-apiserver

（1）新建并编辑kube-scheduler 文件
路径：/usr/lib/systemd/system/kube-scheduler.service，内容为：

[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）配置文件
kube-scheduler配置文件路径为：/etc/kubernetes/scheduler，内容为：

KUBE_MASTER="--master=http://10.16.32.85:8080"
KUBE_SCHEDULER_ARGS="--logtostderr=true --log-dir=/var/log/kubernetes/scheduler --v=2"

2.2.3 将各组件加入开机自启

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

2.3 安装完后检验正确

运行命令 kubectl get cs

3 Node安装

Node节点上安装组件有：

docker
kube-proxy
kubelet

3.1 docker安装

Docker的版本需要与kubelete版本相对应，最好都使用最新的版本。

3.2 拷贝 kubelet、kube-proxy

在之前解压的 kubernetes 文件夹中拷贝二进制文件

cp kubernetes/server/bin/{kubelet,kube-proxy} /usr/bin/

3.3 kube-proxy安装

 vim /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

创建配置目录，并添加配置文件

 mkdir -p /etc/kubernetes

 vim /etc/kubernetes/proxy

KUBE_PROXY_ARGS=""

vim /etc/kubernetes/config

KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow_privileged=false"
KUBE_MASTER="--master=http://10.16.32.85:8080"

启动服务

systemctl daemon-reload
systemctl start kube-proxy

3.4 kubelet安装

vim /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/kubelet
ExecStart=/usr/bin/kubelet $KUBELET_ARGS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target

mkdir -p /var/lib/kubelet

vim /etc/kubernetes/kubelet

KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=10.16.32.87"   #your node ip address
KUBELET_API_SERVER="--api-servers=http://10.16.32.85:8080"
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"

vim /var/lib/kubelet/kubeconfig

apiVersion: v1
kind: Config
users:
- name: kubelet
clusters:
- name: kubernetes
  cluster:
    server: http://10.16.32.85:8080
contexts:
- context:
    cluster: kubernetes
    user: kubelet
  name: service-account-context
current-context: service-account-context

启动kubelet并进行验证

systemctl daemon-reload
systemctl start kubelet.service

3.5 验证成功及问题解决

在master上执行命令kubectl get node，返回如下结果：

问题1：

[root@k8s-m1 ~]# kubectl apply -f nginx_test.yaml 
Error from server (ServerTimeout): error when creating "nginx_test.yaml": No API token found for service account "default", retry after the token is automatically created and added to the service account

解决办法：

配置ServiceAccount

1、首先生成密钥： 
openssl genrsa -out /etc/kubernetes/serviceaccount.key 2048

2、编辑/etc/kubenetes/apiserver 
添加以下内容： 
KUBE_API_ARGS="--service-account-key-file=/etc/kubernetes/serviceaccount.key"

3、再编辑/etc/kubernetes/controller-manager 
添加以下内容： 
KUBE_CONTROLLER_MANAGER_ARGS="--service-account-private-key-file=/etc/kubernetes/serviceaccount.key"

需要再重启kubernetes服务： 
systemctl restart etcd kube-apiserver kube-controller-manager kube-scheduler

posted @ 2018-12-11 20:55 caocong 阅读(1654) 评论(0) 编辑收藏举报

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