FAQ

Frequently Asked Questions

The following questions have been asked (and hopefully answered) at least once.

EACCES / permissions problems and IVC / Rendezvous

Symptom: HaLVMs running the runLeftSide or runServer routines (found in in Communication.Rendezvous) are throwing EACCES and dying. This is a XenStore permissions problem.

Solution: The mkrenddir script must be run (as root, in Dom0) prior to using any IVC. This probably should be done at every boot, after xenstored has started.

I can't access my HaLVM WebServer / HaNS appliance!

Symptom: The HaLVM WebServer example (or some other HaNS device) compiles, runs, and obtains an IP address over some Xen bridge xenbr0, but cannot be reached from a browser / using the relevant TCP or UDP protocol.

Possible solution: Checksum offloading could lead to your packets being discarded. A quick fix involves disabling offloading for your bridge (xenbr0 here) using ethertool.

If you happen to be using Fedora's network service (and not NetworkManager), this involves appending the following line to your bridge definition:

ETHTOOL_OPTS=" --offload xenbr0 tx off rx off"