SERVER-27383 Restrict use of queryableBackupMode to only shards when starting a cluster

1 files changed, 6 insertions, 3 deletions

diff --git a/src/mongo/db/mongod_options.cpp b/src/mongo/db/mongod_options.cpp
index 12e369d5e11..4738e96826d 100644
--- a/src/mongo/db/mongod_options.cpp
+++ b/src/mongo/db/mongod_options.cpp
@@ -603,9 +603,12 @@ Status storeMongodOptions(const moe::Environment& params) {
     }
     if (params.count("sharding.clusterRole")) {
         auto clusterRoleParam = params["sharding.clusterRole"].as<std::string>();
-        // Force to set up the node as a replica set, unless we're using queryable backup mode.
-        if (!params.count("storage.queryableBackupMode") && !params.count("replication.replSet") &&
-            !params.count("replication.replSetName")) {
+        const bool replicationEnabled =
+            params.count("replication.replSet") || params.count("replication.replSetName");
+        // Force to set up the node as a replica set, unless we're a shard and we're using queryable
+        // backup mode.
+        if ((clusterRoleParam == "configsvr" || !params.count("storage.queryableBackupMode")) &&
+            !replicationEnabled) {
             return Status(ErrorCodes::BadValue,
                           str::stream() << "Cannot start a " << clusterRoleParam
                                         << " as a standalone server. Please use the option "