K8S笔记-通过kubeadm方式搭建高可用集群（keepalived+haproxy）
作者：myluzh 分类： Kubernetes 长度：9949 阅读：536
0x00 介绍
虚拟ip 172.16.10.20 master.k8s.io k8s-vip
master01 172.16.10.21 master01.k8s.io master01
master02 172.16.10.22 master02.k8s.io master02
node01 172.16.10.23 node01.k8s.io node01
0x01 初始化（所有节点）
# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
# 关闭selinux
setenforce 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
# 关闭swap
swapoff -a
# 永久关闭swap
sed -ri 's/.*swap.*/#&/' /etc/fstab
# 根据规划设置master、worker节点主机名
hostnamectl set-hostname <hostname>
# 添加 hosts（所有节点）
cat >> /etc/hosts << EOF
172.16.10.20 master.k8s.io k8s-vip
172.16.10.21 master01.k8s.io k8s-master01
172.16.10.22 master02.k8s.io k8s-master02
172.16.10.23 node01.k8s.io ks8-node01
EOF
# 将桥接的 IPv4 流量传递到 iptables 的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
# 时间同步
yum install ntpdate -y
ntpdate time.windows.com
# 重启系统
reboot0x02 部署keepalived（两个master节点）
1、在master节点中安装keepalived相关包
yum install -y conntrack-tools libseccomp libtool-ltdl psmisc
yum install -y keepalived2、配置master节点keepalived配置
可以把master01 priority 设置为101，master02 priority 设置为100，这样master01的优先级就会高于02。默认情况下vip也会在01上。
# master01 master02 配置是一样的
cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
global_defs {
router_id k8s
}
vrrp_script check_haproxy {
script "killall -0 haproxy"
interval 3
weight -2
fall 10
rise 2
}
vrrp_instance VI_1 {
state MASTER
# 网卡接口
interface ens192
virtual_router_id 51
priority 250
advert_int 1
authentication {
auth_type PASS
auth_pass ceb163ec013d66163d6ab
}
virtual_ipaddress {
# vip地址
172.16.10.20
}
track_script {
check_haproxy
}
}
EOF3、keepalived启动与检查
# 启动自启keepalived
systemctl start keepalived
systemctl enable keepalived
systemctl status keepalived
# 查看master网卡信息
ip address show ens1920x03 部署haproxy
1、安装haproxy
yum install -y haproxy2、配置haproxy
两台master节点的配置一样的，配置中声明了后端代理的两个master节点服务器，指定了haproxy运行的端口为16443等，因此16443端口为集群的入口。
cat > /etc/haproxy/haproxy.cfg << EOF
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# kubernetes apiserver frontend which proxys to the backends
#---------------------------------------------------------------------
frontend kubernetes-apiserver
mode tcp
bind *:16443
option tcplog
default_backend kubernetes-apiserver
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend kubernetes-apiserver
mode tcp
balance roundrobin
server master01.k8s.io 172.16.10.21:6443 check
server master02.k8s.io 172.16.10.22:6443 check
#---------------------------------------------------------------------
# collection haproxy statistics message
#---------------------------------------------------------------------
listen stats
bind *:1080
stats auth admin:awesomePassword
stats refresh 5s
stats realm HAProxy\ Statistics
stats uri /admin?stats
EOF3、启动与检查
# 启动与开机自启
systemctl enable haproxy
systemctl start haproxy
systemctl status haproxy
# 检查端口
netstat -lntup | grep haproxy0x04 安装docker、kubeadm、kubelet（所有节点）
1、安装docker
yum -y install yum-utils
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce-18.06.3.ce-3.el7
docker --version
cat <<EOF > daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
}
EOF
mv daemon.json /etc/docker/
systemctl daemon-reload
systemctl enable docker
systemctl restart docker
systemctl status docker2、安装k8s组件
# 添加k8s阿里云yum软件源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 指定版本号部署
yum install -y kubelet-1.16.3 kubeadm-1.16.3 kubectl-1.16.3
systemctl enable kubelet0x05 部署k8s master
1、在具有vip的master节点上创建kubeadm配置文件（我这里的master01）
mkdir /usr/local/kubernetes/manifests -p
cd /usr/local/kubernetes/manifests/
# 编辑配置文件
vi kubeadm-config.yaml
apiServer:
certSANs:
- master01
- master02
- master.k8s.io
- 172.16.10.20
- 172.16.10.21
- 172.16.10.22
- 127.0.0.1
extraArgs:
authorization-mode: Node,RBAC
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta1
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "master.k8s.io:16443"
controllerManager: {}
dns:
type: CoreDNS
etcd:
local:
dataDir: /var/lib/etcd
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.16.3
networking:
dnsDomain: cluster.local
podSubnet: 10.244.0.0/16
serviceSubnet: 10.1.0.0/16
scheduler: {}2、在具有vip的master节点运行（我这里是master01）
kubeadm init --config kubeadm-config.yaml3、根据提示配置环境变量
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# 验证节点状态是否正常
kubectl get nodes
kubectl get pods -n kube-system4、按照提示保存下面内容，一会需要用到
kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
--discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 \
--control-plane0x06 master02节点加入集群
1、复制密钥及相关文件
# 从master1复制密钥及相关文件到master02
ssh root@172.16.10.22 mkdir -p /etc/kubernetes/pki/etcd
scp /etc/kubernetes/admin.conf root@172.16.10.22:/etc/kubernetes
scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@172.16.10.22:/etc/kubernetes/pki
scp /etc/kubernetes/pki/etcd/ca.* root@172.16.10.22:/etc/kubernetes/pki/etcd2、master02加入集群
执行在master1上init后输出的join命令,需要带上参数--control-plane表示把master控制节点加入集群。
kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
--discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 \
--control-plane \3、检查
kubectl get node
kubectl get pods --all-namespaces0x07 加入k8s node节点
1、在node01上执行join
kubeadm join master.k8s.io:16443 --token g57ri1.wci79ladrai0hw2s \
--discovery-token-ca-cert-hash sha256:adf6bfdd443b970a6db50c05882c2316a7d71b7f4df763a863d819cc6d3d3d70 2、在master上检查
kubectl get node
kubectl get pods --all-namespaces0x08 安装集群网络
# 从官方地址获取到flannel的yaml，在master1上执行
mkdir flannel
cd flannel
wget -c https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 安装flannel网络
kubectl apply -f kube-flannel.yml
# 检查
kubectl get pods -n kube-system