Hi HAproxy community, There is a requirement to dynamically construct server/server-template lines based on some variables.
*global section (dcname == us1) :- * set-var proc.dcname env(dcname) *Backend section:- * # svcname.us1.discovery.com is a valid DNS record server-template svcname 1-4 svcname.%[var(proc.dcname)].discovery.com It looks like this isn't possible because in my testing, it doesn't evaluate the var fetch while setting "server.hostname" from server-template. This seems to be true for the "server" directive as well. *Error with server block:- * Config: server abc.def.%[var(proc.dcname)] 127.0.0.1:1234 Error: : character '%' is not permitted in server name 'abc.def.%[var(proc.dcname)]' * Can someone point to the section in the configuration guide <https://docs.haproxy.org/dev/configuration.html#7.3.2> which highlights this limitation? * Are sample fetches only available in specific blocks or directives? Is there a general rule? -- Cheers, Abhijeet (https://abhi.host)
