vDNS Debugging

Steps to debug virtual-DNS issues

If there is a specific host/VM not getting resolved,

• Find hypervisor on which requesting VM is running (via nova show or alternate)
• Access http://hypervisor-ip:8085/Snh_SandeshTraceRequest?x=DnsBind to get how vrouter-agent handled request for dns resolution
• Find hypervisor on which VM whose name is not resolving
• Access http://hypervisor-ip:8085/Snh_SandeshTraceRequest?x=XmppMessageTrace to see if vrouter-agent sent the VM details to the contrail-dns service
• Access http://controller-ip:8092/Snh_SandeshTraceRequest?x=XmppMessageTrace to see if contrail-dns received message from vrouter-agent about VM presence
• Access http://controller-ip:8092/Snh_SandeshTraceRequest?x=DnsBind to see whether contrail-dns programmed bind entries correctly on every controller
• grep in /etc/contrail/dns/* in every controller to check presence of entry