On 10/07/2019 11:02 AM, Lukas Tribus wrote:
Hello,
On Mon, Oct 7, 2019 at 6:30 AM rihad <ri...@mail.ru> wrote:
Thanks! But according to the manual, shouldn't haproxy re-resolve AWS server
name regardless of its resolver settings?
A few other events can trigger a name resolution at run time:
- when a server's health check ends up in a connection timeout: this may be
because the server has a new IP address. So we need to trigger a name
resolution to know this new IP.
No. That is when the resolver is actually configured. Please read from
the same section:
Oh, ok, I must have misunderstood "A few other events *can trigger* a
name resolution at run time"
But that doesn't mean it will necessarily succeed in case no resolvers
have been configured )
I should say that no errors or warnings regarding failed name resolution
even appeared in syslog which left me puzzled about what the root cause
could be.
Anyway, I've added this:
resolvers mydns
# this sugar seems to require haproxy-2.0:
# parse-resolv-conf
nameserver mydns0 127.0.0.1:53
hoping it will help.
Thanks!
HAProxy allows using a host name on the server line to retrieve its IP address
using name servers. By default, HAProxy resolves the name when parsing the
configuration file, at startup and cache the result for the process' life.
This is not sufficient in some cases, such as in Amazon where a server's IP
can change after a reboot or an ELB Virtual IP can change based on current
workload.
This chapter describes how HAProxy can be configured to process server's name
resolution at run time.
Regards,
Lukas
.
