MAJOR: server: postpone address resolution
Server addresses are not resolved anymore upon the first pass so that we
don't fail if an address cannot be resolved by the libc. Instead they are
processed all at once after the configuration is fully loaded, by the new
function srv_init_addr(). This function only acts on the server's address
if this address uses an FQDN, which appears in server->hostname.
For now the function does two things, to followup with HAProxy's historical
default behavior:
1. apply server IP address found in server-state file if runtime DNS
resolution is enabled for this server
2. use the DNS resolver provided by the libc
If none of the 2 options above can find an IP address, then an error is
returned.
All of this will be needed to support the new server parameter "init-addr".
For now, the biggest user-visible change is that all server resolution errors
are dumped at once instead of causing a startup failure one by one.
diff --git a/include/types/server.h b/include/types/server.h
index 5d89212..19da2ad 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -227,6 +227,7 @@
char *resolvers_id; /* resolvers section used by this server */
char *hostname; /* server hostname */
+ char *lastaddr; /* the address string provided by the server-state file */
struct dns_resolution *resolution; /* server name resolution */
struct dns_options dns_opts;