一文学会k8s多master集群+keepalived高可用实战
一、概述
Apiserver是 kubernetes 集群交互的入口,封装了核心对象的增删改查操作,提供了 RESTFul 风格的 API 接口,通过etcd来实现持久化并维护对象的一致性。所以在整个K8S集群中,Apiserver服务至关重要,一旦宕机,整个K8S平台将无法使用,所以保障企业高可用是运维必备的工作之一。
二、安装keepalived
1.安装keepalived
yum install keepalived.x86_64
2.修改配置
cd /etc/keepalived/ vi keepalived.conf
修改master1配置文件keepalived.conf
global_defs { router_id keepalive-master}vrrp_script check_apiserver { # 检测脚本路径 script "/etc/keepalived/check-apiserver.sh" # 多少秒检测一次 interval 3 # 失败的话权重-2 weight -2}vrrp_instance VI-kube-master { state MASTER # 定义节点角色 interface eth0 # 网卡名称 virtual_router_id 68 priority 100 dont_track_primary advert_int 3 virtual_ipaddress { # 自定义虚拟ip 192.168.1.199 } track_script { check_apiserver }}
修改master2配置文件keepalived.conf
global_defs { router_id keepalive-master}vrrp_script check_apiserver { # 检测脚本路径 script "/etc/keepalived/check-apiserver.sh" # 多少秒检测一次 interval 3 # 失败的话权重-2 weight -2}vrrp_instance VI-kube-master { state BACKUP # 定义节点角色 interface eth0 # 网卡名称 virtual_router_id 68 priority 99 dont_track_primary advert_int 3 virtual_ipaddress { # 自定义虚拟ip 192.168.1.199 } track_script { check_apiserver }}
修改master3配置文件keepalived.conf
global_defs { router_id keepalive-master}vrrp_script check_apiserver { # 检测脚本路径 script "/etc/keepalived/check-apiserver.sh" # 多少秒检测一次 interval 3 # 失败的话权重-2 weight -2}vrrp_instance VI-kube-master { state BACKUP # 定义节点角色 interface eth0 # 网卡名称 virtual_router_id 68 priority 99 dont_track_primary advert_int 3 virtual_ipaddress { # 自定义虚拟ip 192.168.1.199 } track_script { check_apiserver }}
3.重启keepalived
systemctl start keepalived.service systemctl status keepalived.service
虚拟vip出现在网卡上
作者:sknfie
链接:https://www.jianshu.com/p/4b4725a1e6c9
来源:简书
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