K8S多节点部署

一、k8s多节点部署（接上篇博客）

1、环境准备

服务器	ip	组件
k8s集群master01	192.168.142.3	kube-apiserver、kube-controller-manager、kube-scheduler、etcd
k8s集群node1	192.168.142.4	kubelet、kube-proxy、docker、flannel
k8s集群node2	192.168.142.5	kubelet、kube-proxy、docker、flannel
k8s集群master02	192.168.142.6	kube-apiserver、kube-controller-manager、kube-scheduler、etcd
负载均衡器1	192.168.142.10
负载均衡器2	192.168.142.20
VIP	192.168.142.100

2、从master01节点上拷贝证书文件、配置文件和服务管理文件到master02

scp -r /opt/etcd/ root@192.168.142.6:/opt/

scp -r /opt/kubernetes/ root@192.168.142.6:/opt

scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.142.6:/usr/lib/systemd/system/

3、修改配置文件kube-apiserver中的IP

vim /opt/kubernetes/cfg/kube-apiserver

KUBE_APISERVER_OPTS="--logtostderr=true \

--v=4 \

--etcd-servers=https://192.168.142.3:2379,https://192.168.142.4:2379,https://192.168.142.5:2379 \

--bind-address=192.168.142.6 \ #修改master02的ip

--secure-port=6443 \

--advertise-address=192.168.142.6 \ #修改master02的ip

4、在master02节点上启动各服务并设置开机自启

systemctl enable --now kube-apiserver.service

systemctl enable --now kube-controller-manager.service

systemctl enable --now kube-scheduler.service

5、查看node节点状态

ln -s /opt/kubernetes/bin/* /usr/local/bin/

kubectl get nodes

kubectl get nodes -o wide #-o=wide：输出额外信息；对于Pod，将输出Pod所在的Node名

//此时在master02节点查到的node节点状态仅是从etcd查询到的信息，而此时node节点实际上并未与master02节点建立通信连接，因此需要使用一个VIP把node节点与master节点都关联起来

二、负载均衡部署（nginx实现负载均衡，keepalived实现双机热备）（192.168.142.10 192.168.142.20）

1、配置nginx的官方在线yum源，配置本地nginx的yum源

cat > /etc/yum.repos.d/nginx.repo << 'EOF'

[nginx]

name=nginx repo

baseurl=http://nginx.org/packages/centos/7/$basearch/

gpgcheck=0

EOF

yum install nginx -y

2、修改nginx配置文件，配置四层反向代理负载均衡

##指定k8s群集2台master的节点ip和6443端口

vim /etc/nginx/nginx.conf

events {

worker_connections 1024;

}

#添加

stream {

log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';

access_log /var/log/nginx/k8s-access.log main;

upstream k8s-apiserver {

server 192.168.142.3:6443;

server 192.168.142.6:6443;

}

server {

listen 6443;

proxy_pass k8s-apiserver;

}

http {

......

3、检查配置文件语法并启动nginx服务

1.检查配置文件语法

nginx -t

2.启动nginx服务，查看已监听6443端口

systemctl enable --now nginx

netstat -natp | grep nginx

4、部署keepalived服务

1	`yum install keepalived -y`

5、修改keepalived配置文件（额外编写健康检查脚本）

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

# 接收邮件地址

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

# 邮件发送地址

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id NGINX_MASTER #lb01节点的为NGINX_MASTER，lb02节点的为 NGINX_BACKUP

}

#添加一个周期性执行的脚本

vrrp_script check_nginx {

script "/etc/nginx/check_nginx.sh" #指定检查nginx存活的脚本路径

}

vrrp_instance VI_1 {

state MASTER #lb01节点的为 MASTER，lb02节点的为 BACKUP

interface ens33 #指定网卡名称 ens33

virtual_router_id 51 #指定vrid，两个节点要一致

priority 100 #lb01节点的为 100，lb02节点的为 90

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.142.100 #指定 VIP

}

track_script {

check_nginx #指定vrrp_script配置的脚本

}

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

##创建nginx状态检查脚本

vim /etc/nginx/check_nginx.sh

#!/bin/bash

#egrep -cv "grep|$$" 用于过滤掉包含grep 或者 $$ 表示的当前Shell进程ID

count=$(ps -ef | grep nginx | egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then

systemctl stop keepalived

fi

chmod +x /etc/nginx/check_nginx.sh

6、启动keepalived服务（一定要先启动了nginx服务，再启动keepalived服务）

systemctl enable --now nginx

systemctl enable --now keepalived

ip a #查看VIP是否生成

三、修改node节点上的kubeconfig配置文件

//修改bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP

cd /opt/kubernetes/cfg/

vim bootstrap.kubeconfig

server: https://192.168.80.100:6443

vim kubelet.kubeconfig

server: https://192.168.80.100:6443

vim kube-proxy.kubeconfig

server: https://192.168.80.100:6443

//重启kubelet和kube-proxy服务

systemctl restart kubelet.service

systemctl restart kube-proxy.service

四、在master01节点上操作

1.测试创建pod

kubectl create deployment nginx-test --image=nginx

2.查看Pod的状态信息

kubectl get pod

kubectl get pods -o wide

3.在对应网段的node节点上操作，可以直接使用浏览器或者curl命令访问

curl 172.17.45.2

4.这时在master01节点上查看nginx日志，发现没有权限查看

kubectl logs nginx-test-7d965f56df-v42rp

Error from server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy) (nginx-test-7d965f56df-v42rp)

5.在master01节点上，将cluster-admin角色授予用户system:anonymous

命令：kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous

clusterrolebinding.rbac.authorization.k8s.io/cluster-system-anonymous created

6.再次查看nginx日志

kubectl logs nginx-test-7d965f56df-v42rp

7.在master01和master02上分别创建pod来测试负载均衡

master01：已创建上面的pod

master02：kubectl create deployment nginx-testaa --image=nginx