In initdb, don't bother trying max_connections = 10.

tglsfdc · tglsfdc · commit 6a0b30f0401a · 2018-03-08T11:26:20.000-05:00
The server won't actually start with that setting anymore, not since we raised the default max_wal_senders to 10. Per discussion, we don't wish to back down on that default, so instead raise the effective floor for max_connections (to 20). It's still possible to configure a smaller setting manually, but initdb won't set it that way. Since that change happened in v10, back-patch to v10. Kyotaro Horiguchi Discussion: https://postgr.es/m/20180209.170823.42008365.horiguchi.kyotaro@lab.ntt.co.jp
diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
@@ -915,7 +915,7 @@ test_config_settings(void)
 #define MIN_BUFS_FOR_CONNS(nconns)	((nconns) * 10)
 
 	static const int trial_conns[] = {
-		100, 50, 40, 30, 20, 10
+		100, 50, 40, 30, 20
 	};
 	static const int trial_bufs[] = {
 		16384, 8192, 4096, 3584, 3072, 2560, 2048, 1536,
