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