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
