Kubernetes多节点二进制部署
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Kubernetes多节点二进制部署
前言
本实验建立在Kubernetes单节点二进制部署基础之上。
实验环境
k8s集群master01:192.168.19.11 kube-apiserver kube-controller-manager kube-scheduler etcd
k8s集群master02:192.168.19.33 （为多节点准备）
k8s集群node01:192.168.19.44 kubelet kube-proxy docker flannel
k8s集群node02: 192.168.19.55
etcd集群节点1:192.168.19.11 etcd
etcd集群节点2:192.168.19.44
etcd集群节点3:192.168.19.55
负载均衡nginx+keepalive01 (master）:192.168.19.66
负载均衡nginx+keepalive02 (backup）:192.168.19.77
systemetl stop firewalld
systemctl disable firewalldsetenforce 0
一、部署master02 节点
修改主机名，关闭防火墙
# k8smaster02（192.168.19.33）
hostnamectl set-hostname k8smaster02
su
systemctl stop firewalld.service
systemctl disable firewalld.service
setenforce 0
# lb01（192.168.19.66）
hostnamectl set-hostname lb01
su
systemctl stop firewalld.service
systemctl disable firewalld.service
setenforce 0
# lb02（192.168.19.77）
hostnamectl set-hostname lb02
su
systemctl stop firewalld.service
systemctl disable firewalld.service
setenforce 0
在k8smaster01上操作
#从 k8smaster01 节点上拷贝证书文件、各master组件的配置文件和服务管理文件到 k8smaster02 节点
scp -r /opt/etcd/ root@192.168.19.33:/opt/
scp -r /opt/kubernetes/ root@192.168.19.33:/opt
scp /usr/lib/systemd/system/kube-apiserver,kube-controller-manager,kube-scheduler.service root@192.168.19.33:/usr/lib/systemd/system/
在k8smaster02上操作
#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://192.168.19.11:2379,https://192.168.19.44:2379,https://192.168.19.55:2379 \\
--bind-address=192.168.19.33 \\ #修改
--secure-port=6443 \\
--advertise-address=192.168.19.33 \\ #修改
......
#在 master02 节点上启动各服务并设置开机自启
systemctl start kube-apiserver.service
systemctl enable kube-apiserver.service
systemctl start kube-controller-manager.service
systemctl enable kube-controller-manager.service
systemctl start kube-scheduler.service
systemctl enable kube-scheduler.service
#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、部署负载均衡
配置load balancer集群双机热备负载均衡（nginx实现负载均衡，keepalived实现双机热备）
1.配置nginx的官方在线yum源，配置本地nginx的yum源
在lb01、lb02节点上操作
#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/$basearch/
gpgcheck=0
EOF
yum install -y nginx
#修改nginx配置文件，配置四层反向代理负载均衡，指定k8s群集2台master的节点ip和6443端口
vim /etc/nginx/nginx.conf
events
worker_connections 1024;
#添加
stream
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver
server 192.168.19.11:6443;
server 192.168.19.33:6443;
server
listen 6443;
proxy_pass k8s-apiserver;
http
......
#检查配置文件语法
nginx -t
#启动nginx服务，查看已监听6443端口
systemctl start nginx
systemctl enable nginx
netstat -natp | grep nginx
2.部署keepalived服务
在lb01、lb02节点上操作
yum install keepalived -y
#修改keepalived配置文件
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
192.168.19.100/24 #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
#启动keepalived服务（一定要先启动了nginx服务，再启动keepalived服务）
systemctl start keepalived
systemctl enable keepalived
ip a #查看VIP是否生成
3.修改k8snode节点上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP
在node01和node02上操作
cd /opt/kubernetes/cfg/
ls
vim bootstrap.kubeconfig
server: https://192.168.19.100:6443
vim kubelet.kubeconfig
server: https://192.168.19.100:6443
vim kube-proxy.kubeconfig
server: https://192.168.19.100:6443
#重启kubelet和kube-proxy服务
systemctl restart kubelet.service
systemctl restart kube-proxy.service
4.在lb01上查看nginx的k8s日志
tail /var/log/nginx/k8s-access.log
三、测试
在 k8smaster01 节点上操作
#测试创建pod
kubectl run nginx --image=nginx
#查看Pod的状态信息
kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-dbddb74b8-5n654 1/1 Running 0 41s
kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
nginx-dbddb74b8-5n654 1/1 Running 0 71s 172.17.52.3 192.168.19.44 <none>
#READY为1/1，表示这个Pod中有1个容器
#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 172.17.52.3
#这时在master01节点上查看nginx日志，发现没有权限查看
kubectl logs nginx-dbddb74b8-5n654
#在master01节点上，将cluster-admin角色授予用户system:anonymous
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous
#再次查看nginx日志
kubectl logs nginx-dbddb74b8-5n654
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