sharding_configdb_on_default_ports.js

// This test confirms that mongos interprets host names passed to it via the
// --configdb command line argument *without* a port number as referring to
// processes listening on the config server port (27019) rather than the default
// mongod port of 27017.
//
// That is, mongos --configdb=localhost should look for a config server on port 27019,
// not port 27017.
//
// The test confirms this behavior for 1-node config servers, SCCC config servers and
// CSRS config servers.

function getHostPart(hostAndPort) {
    return hostAndPort.substr(0, hostAndPort.lastIndexOf(':'));
}
var c1, c2, c3;

// The config servers must support readConcern: majority to be run as a replica set, so
// explicitly set storage engine to wiredTiger.
c1 = MongoRunner.runMongod(
    {configsvr: "", port: 27019, replSet: "csrs", storageEngine: "wiredTiger"});
assert.commandWorked(c1.adminCommand("replSetInitiate"));
c2 = MongoRunner.runMongod({configsvr: "", storageEngine: "wiredTiger"});
c3 = MongoRunner.runMongod({configsvr: "", storageEngine: "wiredTiger"});

assert(MongoRunner.runMongos({configdb: "csrs/" + getHostPart(c1.host)}));