18、企业级容错与监控：Apache、Nagios与Cacti的应用指南

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分类专栏：构建高效Linux基础设施实践文章标签： Apache HAProxy Keepalived

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企业级容错与监控：Apache、Nagios与Cacti的应用指南

1. Apache企业级容错

1.1 HAProxy与Keepalived故障转移测试

在主节点上停止HAProxy服务，可使用以下命令：

# service haproxy stop

检查主节点的 /var/log/messages 日志，会发现虚拟IP地址被移除，日志示例如下：

Nov 19 13:48:07 haproxy Keepalived_vrrp[2471]: VRRP_Script(check_haproxy) failed
Nov 19 13:48:07 haproxy Keepalived_vrrp[2471]: VRRP_Instance(VI_1) Entering FAULT STATE
Nov 19 13:48:07 haproxy Keepalived_vrrp[2471]: VRRP_Instance(VI_1) removing protocol VIPs.
Nov 19 13:48:07 haproxy Keepalived_vrrp[2471]: VRRP_Instance(VI_1) Now in FAULT state
Nov 19 13:48:07 haproxy Keepalived_healthcheckers[2470]: Netlink reflector reports IP 172.16.127.214 removed