搭建K8S集群：kubernetes-1.11.3

搭建K8S集群 kubernetes 1.11.3

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1.1 实验架构：

kubernetes架构

node1: master 10.192.44.129

node2: node2 10.192.44.127

node3: node3 10.192.44.126

etcd架构

node1: master 10.192.44.129

node2: node 10.192.44.127

node3: node 10.192.44.126

harbor服务器

redhat128.example.com

10.192.44.128

2.安装

2.1配置系统相关参数（每台）：

2.1.1 临时禁用selinux

sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux

setenforce 0

2.1.2 临时关闭swap ,永久关闭直接注释fstab中swap行

swapoff -a

2.1.3 开启forward

iptables -P FORWARD ACCEPT

2.1.3 配置转发相关参数，否则可能会出错

cat < /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

vm.swappiness=0

EOF

sysctl --system

2.1.4 配置hosts

10.192.44.126 node3

10.192.44.127 node2

10.192.44.128 redhat128

10.192.44.129 node1

2.1.5 安装docker 参考我此前的blog。

2.1.6 时间同步

yum install ntpdate -y &&ntpdate 0.asia.pool.ntp.org

3.创建TLS证书和秘钥（master节点）

3.1 生成的证书文件如下：

ca-key.pem #根私钥

ca.pem #根证书

kubernetes-key.pem #集群私钥

kubernetes.pem #集群证书

kube-proxy.pem #proxy私钥-node节点进行认证

kube-proxy-key.pem #proxy证书-node节点进行认证

admin.pem #管理员私钥-主要用于kubectl认证

admin-key.pem #管理员证书-主要用于kubectl认证

知识点补充：

TLS: TLS 的作用就是对通讯加密，防止中间人窃听；同时如果证书不信任的话根本就无法与 apiserver 建立连接，更不用提有没有权限向 apiserver 请求指定内容。

RBAC作用：RBAC 中规定了一个用户或者用户组(subject)具有请求哪些 api 的权限；在配合 TLS 加密的时候，实际上 apiserver 读取客户端证书的 CN 字段作为用户名，读取 O 字段作为用户组。

总结：想要与 apiserver 通讯就必须采用由 apiserver CA 签发的证书，这样才能形成信任关系，建立 TLS 连接；第二，可以通过证书的 CN、O 字段来提供 RBAC 所需的用户与用户组。

3.2 下载安装CFSSL(用于签名，验证和捆绑TLS证书的HTTP API工具)（master节点）

wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64

wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64

mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo

mv cfssl_linux-amd64 /usr/local/bin/cfssl

mv https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 /usr/local/bin/cfssljson

chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssl-certinfo /usr/local/bin/cfssljson

3.3创建CA(Certificate Authority)（master节点）

mkdir /root/ssl

cd /root/ssl

cfssl print-defaults config > config.json

cfssl print-defaults csr > csr.json

# 根据config.json文件的格式创建如下的ca-config.json文件

# 过期时间设置成了 87600h

cat > ca-config.json <

{

"signing": {

"default": {

"expiry": "87600h"

"profiles": {

"kubernetes": {

"usages": [

"signing",

"key encipherment",

"server auth",

"client auth"

"expiry": "87600h"

}

EOF

知识点：

ca-config.json：可以定义多个 profiles，分别指定不同的过期时间、使用场景等参数；后续在签名证书时使用某个 profile；

signing：表示该证书可用于签名其它证书；生成的 ca.pem 证书中 CA=TRUE；

server auth：表示client可以用该 CA 对server提供的证书进行验证；

client auth：表示server可以用该CA对client提供的证书进行验证；

3.4 创建证书请求

cat > ca-csr.json <

{

"CN": "kubernetes",

"key": {

"algo": "rsa",

"size": 2048

"names": [

{

"C": "CN",

"ST": "GuangDong",

"L": "ShenZhen",

"O": "k8s",

"OU": "System"

}

"ca": {

"expiry": "87600h"

}

EOF

知识点：

"CN"：Common Name，kube-apiserver 从证书中提取该字段作为请求的用户名 (User Name)

"O"：Organization，kube-apiserver 从证书中提取该字段作为请求用户所属的组 (Group)

3.5 生成CA证书和私钥

cfssl gencert -initca ca-csr.json | cfssljson -bare ca

3.6 创建kubernetes证书请求文件

cat > kubernetes-csr.json <

{

"CN": "kubernetes",

"hosts": [

"127.0.0.1",

"10.192.44.129",

"10.192.44.128",

"10.192.44.126",

"10.192.44.127",

"10.254.0.1",

"*.kubernetes.master",

"localhost",

"kubernetes",

"kubernetes.default",

"kubernetes.default.svc",

"kubernetes.default.svc.cluster",

"kubernetes.default.svc.cluster.local"

"key": {

"algo": "rsa",

"size": 2048

"names": [

{

"C": "CN",

"ST": "GuangDong",

"L": "ShenZhen",

"O": "k8s",

"OU": "System"

}

]

}

EOF

知识点：

这个证书目前专属于 apiserver加了一个 *.kubernetes.master 域名以便内部私有 DNS 解析使用(可删除)；至于很多人问过 kubernetes 这几个能不能删掉，答案是不可以的；因为当集群创建好后，default namespace 下会创建一个叫 kubenretes 的 svc，有一些组件会直接连接这个 svc 来跟 api 通讯的，证书如果不包含可能会出现无法连接的情况；其他几个 kubernetes 开头的域名作用相同

hosts包含的是授权范围，不在此范围的的节点或者服务使用此证书就会报证书不匹配错误。

10.254.0.1是指kube-apiserver 指定的 service-cluster-ip-range 网段的第一个IP。

3.7 生成kubernetes证书和私钥

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes

3.8 创建admin证书

cat > admin-csr.json <

{

"CN": "admin",

"hosts": [],

"key": {

"algo": "rsa",

"size": 2048

"names": [

{

"C": "CN",

"ST": "GuangDong",

"L": "ShenZhen",

"O": "system:masters",

"OU": "System"

}

]

}

EOF

3.9 生成admin证书和私钥

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

知识点：

这个admin 证书，是将来生成管理员用的kube config 配置文件用的，现在我们一般建议使用RBAC 来对kubernetes 进行角色权限控制， kubernetes 将证书中的CN 字段作为User， O 字段作为 Group

3.10 创建Kube-proxy 证书

cat > kube-proxy-csr.json <

{

"CN": "system:kube-proxy",

"hosts": [],

"key": {

"algo": "rsa",

"size": 2048

"names": [

{

"C": "CN",

"ST": "GuangDong",

"L": "ShenZhen",

"O": "k8s",

"OU": "System"

}

]

}

EOF

3.11 生成kube-proxy客户端证书和私钥

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

3.12 校验证书

openssl x509 -noout -text -in kubernetes.pem

3.13分发证书将生成的证书和秘钥文件（后缀名为.pem）拷贝到所有机器的 /etc/kubernetes/ssl 目录下备用

mkdir -p /etc/kubernetes/ssl

scp *.pem {node2,node3}:/etc/kubernetes/ssl

4.创建kubeconfig文件（master节点）

4.1 生成token文件

export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')

export KUBE_APISERVER="https://10.192.44.129:6443"

echo $BOOTSTRAP_TOKEN

cat > token.csv <

${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:bootstrappers"

EOF

cp token.csv /etc/kubernetes/

知识点：不要质疑 system:bootstrappers 用户组是否写错了，有疑问请参考官方文， https://kubernetes.io/docs/admin/kubelet-tls-bootstrapping/

4.2 创建kubelete-kubeconfig文件

kubeconfig 设置其实是权限配置文件，是对k8s集群层面的访问控制。如果不使用--kubeconfig=xx.kubeconfig,他就会默认保存在~/.kube/conf中文件，然后作为默认配置文件。其实通过kubeadm配置也会发现，他要求你将kubeconfig拷贝到~/.kube/conf。

cd /etc/kubernetes/ssl

4.2.1设置集群参数

kubectl config set-cluster kubernetes \

--certificate-authority=/etc/kubernetes/ssl/ca.pem \

--embed-certs=true \

--server=${KUBE_APISERVER} \

--kubeconfig=bootstrap.kubeconfig

4.2.2设置客户端认证参数

kubectl config set-credentials kubelet-bootstrap \

--token=${BOOTSTRAP_TOKEN} \

--kubeconfig=bootstrap.kubeconfig

4.2.3设置上下文参数

kubectl config set-context default \

--cluster=kubernetes \

--user=kubelet-bootstrap \

--kubeconfig=bootstrap.kubeconfig

4.2.4设置默认上下文

kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

4.3 创建kube-proxy文件

4.3.1 设置集群参数

kubectl config set-cluster kubernetes \

--certificate-authority=/etc/kubernetes/ssl/ca.pem \

--embed-certs=true \

--server=${KUBE_APISERVER} \

--kubeconfig=kube-proxy.kubeconfig

4.3.2 设置客户端认证参数

kubectl config set-credentials kube-proxy \

--client-certificate=/etc/kubernetes/ssl/kube-proxy.pem \

--client-key=/etc/kubernetes/ssl/kube-proxy-key.pem \

--embed-certs=true \

--kubeconfig=kube-proxy.kubeconfig

4.3.3 设置上下文参数

kubectl config set-context default \

--cluster=kubernetes \

--user=kube-proxy \

--kubeconfig=kube-proxy.kubeconfig

4.3.4 设置默认上下文

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

4.4 分发kubeconfig 证书

scp bootstrap.kubeconfig kube-proxy.kubeconfig {node2,node3}:/etc/kubernetes/

4.5 创建 admin kubeconfig文件

4.5.1 设置集群参数

kubectl config set-cluster kubernetes \

--certificate-authority=/etc/kubernetes/ssl/ca.pem \

--embed-certs=true \

--server=${KUBE_APISERVER} \

--kubeconfig=admin.conf

4.5.2设置客户端认证参数

kubectl config set-credentials admin \

--client-certificate=/etc/kubernetes/ssl/admin.pem \

--embed-certs=true \

--client-key=/etc/kubernetes/ssl/admin-key.pem \

--kubeconfig=admin.conf

4.5.3设置上下文参数

kubectl config set-context default \

--cluster=kubernetes \

--user=admin \

--kubeconfig=admin.conf

4.5.4设置默认上下文

kubectl config use-context default --kubeconfig=admin.conf

4.6 创建高级审计文件

cat >> audit-policy.yaml <

# Log all requests at the Metadata level.

apiVersion: audit.k8s.io/v1beta1

kind: Policy

rules:

- level: Metadata

EOF

4.7 文件拷贝：

#cp ~/.kube/config /etc/kubernetes/kubelet.kubeconfig (#关于这一步当时我是添加node节点出问题，如果没有问题请忽略这操作，下面的kubelet.kubeconfig一样）

scp /etc/kubernetes/{kubelet.kubeconfig,bootstrap.kubeconfig,kube-proxy.kubeconfig} node2:/etc/kubernetes/

scp /etc/kubernetes/{kubelet.kubeconfig,bootstrap.kubeconfig,kube-proxy.kubeconfig} node3:/etc/kubernetes/

5 创建etcd集群

5.1创建etcd启动服务（每台）

cat > /usr/lib/systemd/system/etcd.service << EOF

[Unit]

Description=Etcd Server

After=network.target

After=network-online.target

Wants=network-online.target

Documentation=https://github.com/coreos

[Service]

Type=notify

WorkingDirectory=/var/lib/etcd/

EnvironmentFile=-/etc/etcd/etcd.conf

ExecStart=/usr/local/bin/etcd \

--name ${ETCD_NAME} \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

--peer-cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--peer-key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

--trusted-ca-file=/etc/kubernetes/ssl/ca.pem \

--peer-trusted-ca-file=/etc/kubernetes/ssl/ca.pem \

--initial-advertise-peer-urls ${ETCD_INITIAL_ADVERTISE_PEER_URLS} \

--listen-peer-urls ${ETCD_LISTEN_PEER_URLS} \

--listen-client-urls ${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \

--advertise-client-urls ${ETCD_ADVERTISE_CLIENT_URLS} \

--initial-cluster-token ${ETCD_INITIAL_CLUSTER_TOKEN} \

--initial-cluster infra1=https://172.20.0.113:2380,infra2=https://172.20.0.114:2380,infra3=https://172.20.0.115:2380 \

--initial-cluster-state new \

--data-dir=${ETCD_DATA_DIR}

Restart=on-failure

RestartSec=5

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

EOF

知识点： systemd是配置管理驱动服务的。环境变量 = -/ "-"表示抑制错误，即发生错误的时候，也不影响其他命令的执行。

5.2 编辑配置文件(以ectd1为例，etcd2,etcd3注意替换IP地址)

mkdir /etc/etcd && vim /etc/etcd/etcd.conf

cat > /etc/etcd/etcd.conf << EOF

ETCD_NAME=infra1

ETCD_DATA_DIR="/var/lib/etcd"

ETCD_LISTEN_PEER_URLS="https://10.192.44.129:2380"

ETCD_LISTEN_CLIENT_URLS="https://10.192.44.129:2379"

#[cluster]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.192.44.129:2380"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_ADVERTISE_CLIENT_URLS="https://10.192.44.129:2379"

5.3启动etcd服务器，记得创建/var/lib/etcd。

mkdir /var/lib/etcd

systemctl enable etcd && systemctl start etcd

6 部署master节点：（好像需要自己到服务器文件解压）

6.1 下载kubernetes 文件

下载kubernetes (v1.11.3)

wget https://github.com/kubernetes/kubernetes/releases/download/v1.11.3/kubernetes.tar.gz

tar -xzvf kubernetes.tar.gz

cd kubernetes

./cluster/get-kube-binaries.sh

#如果不行，请手动操作

cd server/

tar -zxvf kubernetes-server-linux-amd64.tar.gz

cp kubernetes/server/bin/kube-apiserver /usr/local/bin/kube-apiserver

cp kubernetes/server/bin/kube-controller-manager /usr/local/bin/kube-controller-manager

cp kubernetes/server/bin/kube-scheduler /usr/local/bin/kube-scheduler

chmod +x /usr/local/bin/{kube-apiserver,kube-controller-manager,kube-scheduler}

6.2配置系统服务启动kube-apiserver，kube-controller-manager,kube-scheduler

6.2.1创建kube-apiserver.service

cat > /usr/lib/systemd/system/kube-apiserver.service << EOF

[Unit]

Description=Kubernetes API Service

Documentation=https://github.com/GoogleCloudPlatform/kubernetes

After=network.target

After=etcd.service

[Service]

EnvironmentFile=-/etc/kubernetes/config

EnvironmentFile=-/etc/kubernetes/apiserver

ExecStart=/usr/local/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

EOF

6.2.2 创建kube-controller-manager.service

cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF

[Unit]

Description=Kubernetes Controller Manager

Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]

EnvironmentFile=-/etc/kubernetes/config

EnvironmentFile=-/etc/kubernetes/controller-manager

ExecStart=/usr/local/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

EOF

6.2.3 创建kube-scheduler.service

cat > /usr/lib/systemd/system/kube-scheduler.service << EOF

[Unit]

Description=Kubernetes Scheduler Plugin

Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]

EnvironmentFile=-/etc/kubernetes/config

EnvironmentFile=-/etc/kubernetes/scheduler

ExecStart=/usr/local/bin/kube-scheduler \

$KUBE_LOGTOSTDERR \

$KUBE_LOG_LEVEL \

$KUBE_MASTER \

$KUBE_SCHEDULER_ARGS

Restart=on-failure

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

EOF

6.2.4 编辑/etc/kubernetes/config文件

cat > /etc/kubernetes/config << EOF

###

# kubernetes system config

# The following values are used to configure various aspects of all

# kubernetes services, including

# kube-apiserver.service

# kube-controller-manager.service

# kube-scheduler.service

# kubelet.service

# kube-proxy.service

# logging to stderr means we get it in the systemd journal

KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level, 0 is debug

KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers

KUBE_ALLOW_PRIV="--allow-privileged=true"

# How the controller-manager, scheduler, and proxy find the apiserver

#KUBE_MASTER="--master=http://test-001.jimmysong.io:8080"

KUBE_MASTER="--master=http://10.192.44.129:8080"

EOF

6.2.5 编辑apiserver配置文件

cat > /etc/kubernetes/apiserver << EOF

###

## 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="--insecure-bind-address=test-001.jimmysong.io"

KUBE_API_ADDRESS="--advertise-address=10.192.44.129 --bind-address=10.192.44.129 --insecure-bind-address=10.192.44.129"

## The port on the local server to listen on.

KUBE_API_PORT="--secure-port=6443"

## Port minions listen on

#KUBELET_PORT="--kubelet-port=10250"

## Comma separated list of nodes in the etcd cluster

KUBE_ETCD_SERVERS="--etcd-servers=https://10.192.44.129:2379,https://10.192.44.127:2379,https://10.192.44.126:2379"

## 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="--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota,NodeRestriction"

## Add your own!

KUBE_API_ARGS="--anonymous-auth=false \

--authorization-mode=Node,RBAC \

--kubelet-https=true \

--kubelet-timeout=3s \

--enable-bootstrap-token-auth \

--enable-garbage-collector \

--enable-logs-handler \

--token-auth-file=/etc/kubernetes/token.csv \

--service-node-port-range=30000-32767 \

--tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

--client-ca-file=/etc/kubernetes/ssl/ca.pem \

--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \

--etcd-cafile=/etc/kubernetes/ssl/ca.pem \

--etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem \

--etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem \

--etcd-compaction-interval=5m0s \

--etcd-count-metric-poll-period=1m0s \

--enable-swagger-ui=true \

--apiserver-count=3 \

--log-flush-frequency=5s \

--audit-log-maxage=30 \

--audit-log-maxbackup=3 \

--audit-log-maxsize=100 \

--audit-log-path=/var/lib/audit.log \

--audit-policy-file=/etc/kubernetes/audit-policy.yaml \

--storage-backend=etcd3 \

--event-ttl=1h"

EOF

6.2.6 编辑controller-manager配置文件

cat > /etc/kubernetes/controller-manager << EOF

###

# 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="--address=127.0.0.1

--service-cluster-ip-range=10.254.0.0/16

--cluster-name=kubernetes

--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem

--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem

--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem

--root-ca-file=/etc/kubernetes/ssl/ca.pem

--leader-elect=true"

EOF

6.2.7 编辑scheduler配置文件

cat > /etc/kubernetes/scheduler << EOF

###

# kubernetes scheduler config

# default config should be adequate

# Add your own!

KUBE_SCHEDULER_ARGS="--leader-elect=true --address=127.0.0.1 --algorithm-provider=DefaultProvider"

6.2.8 启动服务

systemctl daemon-reload

systemctl enable kueb-apiserver kube-controller-manager kube-scheduler

systemctl start kueb-apiserver kube-controller-manager kube-scheduler

6.2.9 验证master节点功能

kubectl get componentstatuses

如下：

NAME STATUS MESSAGE ERROR

scheduler Healthy ok

controller-manager Healthy ok

etcd-0 Healthy {"health": "true"}

etcd-1 Healthy {"health": "true"}

etcd-2 Healthy {"health": "true"}

6.2.10 kubectl命令补全

echo "source <(kubectl completion bash)" >> ~/.bashrc

source ~/.bashrc

7. 安装flannel网络插件

7.1 通过yum安装配置flannel（每节点）

yum install -y flannel

7.2 配置服务文件（每节点）

cat > /usr/lib/systemd/system/flanneld.service << EOF

[Unit]

Description=Flanneld overlay address etcd agent

After=network.target

After=network-online.target

Wants=network-online.target

After=etcd.service

Before=docker.service

[Service]

Type=notify

EnvironmentFile=/etc/sysconfig/flanneld

EnvironmentFile=-/etc/sysconfig/docker-network

ExecStart=/usr/bin/flanneld-start \

-etcd-endpoints=${FLANNEL_ETCD_ENDPOINTS} \

-etcd-prefix=${FLANNEL_ETCD_PREFIX} \

$FLANNEL_OPTIONS

ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker

Restart=on-failure

[Install]

WantedBy=multi-user.target

RequiredBy=docker.service

知识点：mk-docker-opts.sh生成环境变量/run/flannel/subnet.env，/run/docker_opts.env。后续要docker要调用其配置文件。

7.3 创建flanneld配置文件（每节点）

cat > /etc/sysconfig/flanneld << EOF

# Flanneld configuration options

# etcd url location. Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="https://10.192.44.129:2379,https://10.192.44.127:2379,https://10.192.44.126:2379"

# etcd config key. This is the configuration key that flannel queries

# For address range assignment

FLANNEL_ETCD_PREFIX="/kube-centos/network"

# Any additional options that you want to pass

FLANNEL_OPTIONS="-etcd-cafile=/etc/kubernetes/ssl/ca.pem -etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem -etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem"

7.4 在etcd创建网络配置（每节点，gw模式）

etcdctl --endpoints=https://10.192.44.129:2379,https://10.192.44.127:2379,https://10.192.44.126:2379 \

--ca-file=/etc/kubernetes/ssl/ca.pem \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

mkdir /kube-centos/network

etcdctl --endpoints=https://10.192.44.129:2379,https://10.192.44.127:2379,https://10.192.44.126:2379 \

--ca-file=/etc/kubernetes/ssl/ca.pem \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

mk /kube-centos/network/config '{"Network":"172.30.0.0/16","SubnetLen":24,"Backend":{"Type":"host-gw"}}'

7.5 启动flannel（每节点）

systemctl daemon-reload

systemctl restart flanneld

systemctl start flanneld

7.6 查看etcd内容(随便一个节点执行就行了，因为数据是同步的)

etcdctl --endpoints=https://10.192.44.129:2379 \

--ca-file=/etc/kubernetes/ssl/ca.pem \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

ls /kube-centos/network/subnets

etcdctl --endpoints=https://10.192.44.129:2379 \

--ca-file=/etc/kubernetes/ssl/ca.pem \

--cert-file=/etc/kubernetes/ssl/kubernetes.pem \

--key-file=/etc/kubernetes/ssl/kubernetes-key.pem \

get /kube-centos/network/config

7.7 将flannel启动后生成的环境变量添加到docker的systemd目录。（每节点）

vim /usr/lib/systemd/system/docker.service

EnvironmentFile=-/run/flannel/docker

systemctl daemon-reload && systemctl restart docker

7.8 更改dockerd启动配置(每节点)

vim /usr/lib/systemd/system/docker.service

EnvironmentFile=-/run/flannel/docker

ExecStart=/usr/bin/dockerd \

$DOCKER_OPT_BIP \

$DOCKER_OPT_IPMASQ \

$DOCKER_OPT_MTU \

--log-driver=json-file

8.部署node节点

8.1 TLS bootstrapping配置(master节点)

cd /etc/kubernetes

kubectl create clusterrolebinding kubelet-bootstrap \

--clusterrole=system:node-bootstrapper \

--user=kubelet-bootstrap

kubectl create clusterrolebinding kubelet-nodes \

--clusterrole=system:node \

--group=system:nodes

知识点：

kubelet 启动时向 kube-apiserver 发送 TLS bootstrapping 请求，需要先将 bootstrap token 文件中的 kubelet-bootstrap 用户赋予 system:node-bootstrapper cluster 角色(role)，然后 kubelet 才能有权限创建认证请求(certificate signing requests)：

kubelet 通过认证后向 kube-apiserver 发送 register node 请求，需要先将 kubelet-nodes 用户赋予 system:node cluster角色(role) 和 system:nodes 组(group)，然后 kubelet 才能有权限创建节点请求：

8.2 下载kubelet和kube-proxy 二进制文件（每节点）

wget https://github.com/kubernetes/kubernetes/releases/download/v1.11.3/kubernetes.tar.gz

tar -xzvf kubernetes.tar.gz

cd kubernetes

./cluster/get-kube-binaries.sh

#如果不行，请手动操作

cd server/

tar -zxvf kubernetes-server-linux-amd64.tar.gz

cp kubernetes/server/bin/kubelet /usr/local/bin/kubelet

cp kubernetes/server/bin/kube-proxy /usr/local/bin/kube-proxy

chmod +x /usr/local/bin/{kubelet,kube-proxy}

8.3 配置系统服务启动kubelet，kube-proxy

8.3.1 创建kubelete

cat > /usr/lib/systemd/system/kubelet.service << EOF

[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/local/bin/kubelet \

$KUBE_LOGTOSTDERR \

$KUBE_LOG_LEVEL \

$KUBELET_ADDRESS \

$KUBELET_PORT \

$KUBELET_HOSTNAME \

$KUBE_ALLOW_PRIV \

$KUBELET_POD_INFRA_CONTAINER \

$KUBELET_ARGS

Restart=on-failure

[Install]

WantedBy=multi-user.target

EOF

8.3.2 创建Kube-proxy

cat > /usr/lib/systemd/system/kube-proxy.service << EOF

[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/local/bin/kube-proxy \

$KUBE_LOGTOSTDERR \

$KUBE_LOG_LEVEL \

$KUBE_MASTER \

$KUBE_PROXY_ARGS

Restart=on-failure

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

EOF

8.3.3 创建conf文件

cd /etc/kubernetes

cat >/etc/kubernetes/config<

KUBE_LOGTOSTDERR="--logtostderr=true"

KUBE_LOG_LEVEL="--v=2"

EOF

8.3.4 创建kubelete-conf文件(master)

cat > /etc/kubernetes/kubelet << EOF

###

## 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=10.192.44.129"

## 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=master"

## location of the api-server

## COMMENT THIS ON KUBERNETES 1.8+

## pod infrastructure container

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=gcr.io/google_containers/pause-amd64:3.0"

## Add your own!

KUBELET_ARGS="--cluster-dns=10.254.0.2 --bootstrap-kubeconfig=/etc/kubernetes/bootstrap.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --cert-dir=/etc/kubernetes/ssl --cluster-domain=cluster.local. --allow-privileged=true --serialize-image-pulls=false --fail-swap-on=false --log-dir=/var/log/kubernetes/kubelet"

EOF

8.3.5 创建kubelete-conf文件(node2)

cat > /etc/kubernetes/kubelet << EOF

###

## 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=10.192.44.127"

## 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=node2"

## location of the api-server

## COMMENT THIS ON KUBERNETES 1.8+

## pod infrastructure container

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=gcr.io/google_containers/pause-amd64:3.0"

## Add your own!

EOF

8.3.6 创建kubelete-conf文件(node3)

cat > /etc/kubernetes/kubelet << EOF

###

## 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=10.192.44.126"

## 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=node3"

## location of the api-server

## COMMENT THIS ON KUBERNETES 1.8+

## pod infrastructure container

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=gcr.io/google_containers/pause-amd64:3.0"

## Add your own!

EOF

8.3.7 创建kube-proxy文件(master)

cat > /etc/kubernetes/proxy << EOF

###

# kubernetes proxy config

# default config should be adequate

# Add your own!

KUBE_PROXY_ARGS="--bind-address=10.192.44.129 --hostname-override=master --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig --cluster-cidr=10.254.0.0/16 --log-dir=/var/log/kubernetes/proxy"

EOF

8.3.7 创建kube-proxy文件(node2)

cat > /etc/kubernetes/proxy << EOF

###

# kubernetes proxy config

# default config should be adequate

# Add your own!

KUBE_PROXY_ARGS="--bind-address=10.192.44.127 --hostname-override=node2 --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig --cluster-cidr=10.254.0.0/16 --log-dir=/var/log/kubernetes/proxy"

EOF

8.3.8 创建kube-proxy文件(node3)

cat > /etc/kubernetes/proxy << EOF

###

# kubernetes proxy config

# default config should be adequate

# Add your own!

KUBE_PROXY_ARGS="--bind-address=10.192.44.126 --hostname-override=node3 --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig --cluster-cidr=10.254.0.0/16 --log-dir=/var/log/kubernetes/proxy"

EOF

8.3.9 启动kubelet

systemctl daemon-reload && systemctl enable kubelet && systemctl start kubelet

8.3.10 启动kube-proxy

systemctl daemon-reload && systemctl enable kube-proxy && systemctl start kube-proxy

8.3.11 查看证书申请请求（node节点自动去kubeapi节点申请）

kubectl get csr

8.3.12 master节点允许请求，查看证书请求状态

kubectl certificate approve node-csr-Yiiv675wUCvQl3HH11jDr0cC9p3kbrXWrxvG3EjWGoE

kubectl describe csr node-csr-Yiiv675wUCvQl3HH11jDr0cC9p3kbrXWrxvG3EjWGoE

状态标注下如下：

kubectl describe csr node-csr-hsBS9OyhOa8rK_Q48ee81giH17t6Nk4FL9IRWRt4ygw

Name: node-csr-hsBS9OyhOa8rK_Q48ee81giH17t6Nk4FL9IRWRt4ygw

Labels:

Annotations:

CreationTimestamp: Thu, 22 Nov 2018 20:19:09 +0800

Requesting User: kubelet-bootstrap

Status: Approved,Issued

Subject:

Common Name: system:node:node3

Serial Number:

Organization: system:nodes

8.3.13 查看节点状态

kubectl get nodes

8.3.14 创建测试

vim deploy.yaml

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

spec:

replicas: 2

template:

metadata:

labels:

app: nginx

spec:

containers:

- name: nginx

image: ngxin:1.7.9

ports:

- containerPort: 80

kubectl create -f deploy.yaml

kubectl scale deployment nginx --replicas=4

9.部署集群DNS(CoreDNS)

9.1 下载coredns配置文件，如下:

coredns.yaml.sed

apiVersion: v1

kind: ServiceAccount

metadata:

namespace: kube-system

---

apiVersion: rbac.authorization.k8s.io/v1beta1

kind: ClusterRole

metadata:

labels:

kubernetes.io/bootstrapping: rbac-defaults

rules:

- apiGroups:

- ""

resources:

- endpoints

- services

- pods

- namespaces

verbs:

- list

- watch

---

apiVersion: rbac.authorization.k8s.io/v1beta1

kind: ClusterRoleBinding

metadata:

annotations:

rbac.authorization.kubernetes.io/autoupdate: "true"

labels:

kubernetes.io/bootstrapping: rbac-defaults

roleRef:

apiGroup: rbac.authorization.k8s.io

kind: ClusterRole

subjects:

- kind: ServiceAccount

namespace: kube-system

---

apiVersion: v1

kind: ConfigMap

metadata:

namespace: kube-system

data:

Corefile: |

.:53 {

errors

health

kubernetes CLUSTER_DOMAIN REVERSE_CIDRS {

pods insecure

upstream

fallthrough in-addr.arpa ip6.arpa

}

prometheus :9153

proxy . /etc/resolv.conf

cache 30

}

---

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

namespace: kube-system

labels:

k8s-app: kube-dns

kubernetes.io/name: "CoreDNS"

spec:

replicas: 2

strategy:

type: RollingUpdate

rollingUpdate:

maxUnavailable: 1

selector:

matchLabels:

k8s-app: kube-dns

template:

metadata:

labels:

k8s-app: kube-dns

spec:

serviceAccountName: coredns

tolerations:

- key: "CriticalAddonsOnly"

operator: "Exists"

containers:

- name: coredns

image: coredns/coredns:1.1.1

imagePullPolicy: IfNotPresent

args: [ "-conf", "/etc/coredns/Corefile" ]

volumeMounts:

- name: config-volume

mountPath: /etc/coredns

ports:

- containerPort: 53

protocol: UDP

- containerPort: 53

protocol: TCP

- containerPort: 9153

protocol: TCP

livenessProbe:

httpGet:

path: /health

port: 8080

scheme: HTTP

initialDelaySeconds: 60

timeoutSeconds: 5

successThreshold: 1

failureThreshold: 5

dnsPolicy: Default

volumes:

- name: config-volume

configMap:

items:

- key: Corefile

path: Corefile

---

apiVersion: v1

kind: Service

metadata:

namespace: kube-system

annotations:

prometheus.io/scrape: "true"

labels:

k8s-app: kube-dns

kubernetes.io/cluster-service: "true"

kubernetes.io/name: "CoreDNS"

spec:

selector:

k8s-app: kube-dns

clusterIP: CLUSTER_DNS_IP

ports:

- name: dns

port: 53

protocol: UDP

- name: dns-tcp

port: 53

protocol: TCP

9.2 编写部署脚本

cat > deploy.sh << EOF

#!/bin/bash

# Deploys CoreDNS to a cluster currently running Kube-DNS.

SERVICE_CIDR=${1:-10.254.0.0/16}

POD_CIDR=${2:-172.30.0.0/16}

CLUSTER_DNS_IP=${3:-10.254.0.2}

CLUSTER_DOMAIN=${4:-cluster.local}

YAML_TEMPLATE=${5:-`pwd`/coredns.yaml.sed}

sed -e s/CLUSTER_DNS_IP/$CLUSTER_DNS_IP/g -e s/CLUSTER_DOMAIN/$CLUSTER_DOMAIN/g -e s?SERVICE_CIDR?$SERVICE_CIDR?g -e s?POD_CIDR?$POD_CIDR?g $YAML_TEMPLATE > coredns.yaml

EOF

知识点：根据自己的node网络，cluster修改自己的地址段。

9.3 部署coredns

chmod + deploy.sh

./deploy.sh

kubectl create -f coredns.yaml

9.4 验证dns服务

9.4.1 创建deployment

cat > busyboxdeploy.yaml << EOF

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

spec:

replicas: 2

template:

metadata:

labels:

app: busybox

spec:

containers:

- name: busybox

image: busybox

ports:

- containerPort: 80

args: ["/bin/sh","-c","sleep 1000"]

EOF

9.4.2 进入pod，ping自己的SVC

kubectl exec busybox-deployment-6679c4bb96-86kfg -it -- /bin/sh

# ping kubernetes

# ...

# 虽然因为网络的问题ping不同，但是可以解析出名称。

10. 部署heapster

10.1.下载yaml文件

mkdir heapter

cd hapster

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/grafana.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/heapster.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/influxdb.yaml

wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/rbac/heapster-rbac.yaml

10.2. 修改yaml的container镜像源文件（默认使用goolge镜像源，我们下载不到只能改成其他人上传至dockerhub上的）

10.2.1 修改grafana.yaml

k8s.gcr.io/heapster-grafana-amd64:v5.0.4 mirrorgooglecontainers/heapster-grafana-amd64:v5.0.4

10.2.2 修改heapster.yaml

k8s.gcr.io/heapster-amd64:v1.5.4 cnych/heapster-amd64:v1.5.4

10.2.3 修改influxdb.yaml

k8s.gcr.io/heapster-influxdb-amd64:v1.5.2 fishchen/heapster-influxdb-amd64:v1.5.2

10.3 查看heapster状态

kubectl get svc -n kube-system

10.4 在master设置代理可以允许外部访问

kubectl proxy --port=8096 --address="10.192.44.129" --accept-hosts='^*$'

11.部署dashboard

11.1 下载dashboard的yaml文件

wget https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml -O kubernetes-dashboard.yaml

11.2 修改如下：（使用的是官方镜像，但是更换了images，添加了nodePort）

# ------------------- Dashboard Secret ------------------- #

apiVersion: v1

kind: Secret

当前名称：搭建K8S集群：kubernetes-1.11.3
文章起源：http://cdiso.cn/article/ggopog.html

搭建K8S集群：kubernetes-1.11.3

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