已经设置开机启动，但是开机后查看Keepalived没有运行。
查看系统开机日志，发现Keepalived启动的非常早，比nginx，mycat，mysql都早，
然后一运行检查脚本，kill掉了自己。
Keepalived是系统应用开机早于docker
Keepalived通常在Docker之前启动是因为它负责管理和提供虚拟IP（VIP）的高可用性功能。Docker是一个容器化平台，用于部署和管理应用程序。而Keepalived则是在主机级别上运行，并与网络服务和负载均衡器协同工作。
当您在Docker容器中运行应用程序时，Keepalived运行在宿主机操作系统上，而不是容器内部。这是因为虚拟IP（VIP）的管理通常需要底层主机的网络栈和防火墙配置来正确路由流量和实现故障转移。
通常，启动顺序如下：
- 主机操作系统启动。
- Keepalived作为系统服务在主机上启动，以提供虚拟IP的高可用。
- Docker引擎在主机上启动，并开始管理容器。
- 在Docker容器中启动和管理应用程序。
这种启动顺序确保了在Docker容器中部署的应用程序能够利用Keepalived提供的虚拟IP进行高可用性配置并进行故障转移。这样，在出现主机或容器故障时，Keepalived能够确保VIP在其他健康主机上可用，并将流量正确路由到相应的容器。
需要注意的是，具体的启动顺序可能会因环境、部署方式和配置而有所不同。确保在设计和设置环境时，理解和适应所使用的工具和服务之间的依赖关系，并采用适合您特定需求的启动顺序。
Yes, Keepalived is a system application. It is a lightweight and high-availability solution for Linux-based systems that provides virtual IP (VIP) failover functionality. Keepalived is typically used in conjunction with load balancers or other network services to ensure that a single virtual IP address is always available even if one of the servers or nodes fails.
Keepalived runs as a daemon process on the Linux system and utilizes the Virtual Router Redundancy Protocol (VRRP) to manage the assignment and failover of the virtual IP address. It monitors the health and availability of various nodes or servers and dynamically assigns or releases the VIP based on the configured rules and conditions.
Overall, Keepalived helps enhance the reliability and availability of network services by providing failover capabilities and ensuring uninterrupted service in the event of server failures or network issues.
