(Hello it, linux learning document -keepalive+lvs building high availability server v1.1 this document involves the following contents: 1. Overview of keepalive software; 2. Overview of VRRP protocol; 3. Installation of keepalive software; 4. Detailed description of keepalive configuration; 5. Realization of high availability cluster by keepalive+lvs; 6. Some troubleshooting)