云服务器如何配置keepalived,云服务器配置指南,深入解析Keepalived实现高可用性
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- 2025-04-06 00:16:20
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云服务器配置Keepalived实现高可用性的指南,深入解析了Keepalived的配置过程,旨在帮助用户了解如何在云服务器上部署Keepalived,确保服务稳定性和...
云服务器配置Keepalived实现高可用性的指南,深入解析了Keepalived的配置过程,旨在帮助用户了解如何在云服务器上部署Keepalived,确保服务稳定性和故障转移。
随着互联网的快速发展,云计算已经成为企业信息化建设的重要手段,云服务器作为云计算的核心组成部分,为企业提供了高效、稳定、安全的服务,在云服务器部署过程中,如何实现高可用性成为企业关注的焦点,本文将深入解析Keepalived在云服务器配置中的应用,帮助您实现高可用性。
Keepalived简介
Keepalived是一款开源的高可用性软件,主要用于实现虚拟IP(VIP)的故障转移和负载均衡,通过Keepalived,可以实现云服务器集群中主备节点的自动切换,确保服务的连续性和稳定性。
Keepalived配置步骤
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安装Keepalived
在云服务器上,首先需要安装Keepalived,以下以CentOS 7为例,展示安装过程:
(1)执行以下命令安装EPEL源:
sudo yum install epel-release
(2)执行以下命令安装Keepalived:
sudo yum install keepalived
配置Keepalived
(1)编辑主节点(VIP所在节点)的Keepalived配置文件:
sudo vi /etc/keepalived/keepalived.conf
(2)添加以下内容:
! Configuration File for keepalived
global_defs {
notification_email {
admin@example.com
}
notification_email_subject "Keepalived Alert"
notification_email_from "Keepalived <admin@example.com>"
smtp_server 192.168.1.1
smtp_connect_timeout 30
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.1.100/24 dev eth0 label eth0:0
}
}
virtual_server 192.168.1.100 80 {
delay_loop 6
lb_algorithm roundrobin
persistence_timeout 50
health_check {
url http://192.168.1.100:80/health
interval 2
timeout 2
retries 3
ignore_errors 1
}
server 192.168.1.101 80
server 192.168.1.102 80
}
(3)解释配置文件内容:
global_defs
:全局配置,包括邮件通知、SMTP服务器等。vrrp_instance
:VRRP实例配置,包括状态、接口、虚拟路由ID、优先级、通告间隔、认证等。virtual_ipaddress
:虚拟IP地址配置,包括IP地址、子网掩码、设备名等。virtual_server
:虚拟服务器配置,包括端口号、延迟循环、负载均衡算法、持久化超时、健康检查等。health_check
:健康检查配置,包括URL、间隔、超时、重试次数、忽略错误等。server
:后端服务器配置,包括IP地址、端口号等。
配置备份节点
(1)编辑备份节点的Keepalived配置文件:
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sudo vi /etc/keepalived/keepalived.conf
(2)添加以下内容:
! Configuration File for keepalived
global_defs {
notification_email {
admin@example.com
}
notification_email_subject "Keepalived Alert"
notification_email_from "Keepalived <admin@example.com>"
smtp_server 192.168.1.1
smtp_connect_timeout 30
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.1.100/24 dev eth0 label eth0:0
}
}
virtual_server 192.168.1.100 80 {
delay_loop 6
lb_algorithm roundrobin
persistence_timeout 50
health_check {
url http://192.168.1.100:80/health
interval 2
timeout 2
retries 3
ignore_errors 1
}
server 192.168.1.101 80
server 192.168.1.102 80
}
(3)解释配置文件内容:
state BACKUP
:将节点设置为备份节点。priority 90
:将备份节点的优先级设置为90,低于主节点的100。
启动Keepalived服务
(1)在主节点上执行以下命令启动Keepalived服务:
sudo systemctl start keepalived
(2)在备份节点上执行以下命令启动Keepalived服务:
sudo systemctl start keepalived
验证配置
(1)在主节点上执行以下命令查看VIP是否已经分配:
ip addr show eth0:0
(2)在备份节点上执行以下命令查看VIP是否已经分配:
ip addr show eth0:0
通过以上步骤,您已经成功配置了Keepalived在云服务器中的应用,实现了高可用性,在实际应用中,您可以根据需要调整Keepalived配置,以满足不同场景的需求。
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