should script "</dev/tcp/127.0.0.1/80" work out-of-the-box on linux?

[SjonHortensius]

Should the script mentioned in doc/samples/keepalived.conf.vrrp.localcheck work out of the box? On my linux machine, trying it results in:

Script </dev/tcp/127.0.0.1/80 cannot be accessed - No such file or directory
Disabling track script chk_http_port since not found/accessible

Some research suggests the linux kernel doesn't provide this, and if it works it is probably implemented in userspace, eg. bash.

Should this work or is there another method to quickly check if a process is listening on a port ?

[pqarmitage]

Yes, they should have worked.

Commit 5cd5fff resolves the problem.