redis: add debug log if communication with connected db failed (e.g. TLS mismatch)

diff --git a/src/knot/common/hiredis.c b/src/knot/common/hiredis.c
index f7f4933c072e06d1d94302b576bb4d37e127bc1f..bcf4e2e0a8a9abdb1b5cbdcf5fba2c6fa101b2e3 100644 (file)
--- a/src/knot/common/hiredis.c
+++ b/src/knot/common/hiredis.c
@@ -358,6 +358,8 @@ redisContext *rdb_connect(conf_t *conf, bool require_master, const char *info)
                                goto connected;
                        }
                } else {
+                       log_debug("rdb, failed to query, remote %s%s%.0u",
+                                 addr_str, (port != 0 ? "@" : ""), port);
                        redisFree(rdb);
                }