Hey @log
First, thanks for making me smile today, PRIMARYGUY 
Your settings look correct, I see you using Differen port for each mondoDb, but did you configure each Mongo node with those ports?
vi /etc/mongod.conf
net:
port: 27017
bindIp: PRIMARYGUY
replication:
replicaSetName: mongoReplicaSet
net:
port: 27021
bindIp: SECONDARY1
replication:
replicaSetName: mongoReplicaSet
net:
port: 27022
bindIp: SECONDARY2
replication:
replicaSetName: mongoReplicaSet
Second, when you execute this mongo shell command , what do you see?
mongoReplicaSet:PRIMARYGUY> rs.config()
mongoReplicaSet:PRIMARYGUY> rs.status()
Here is my config output
{
"_id" : "mongoReplicaSet",
"version" : 3,
"protocolVersion" : NumberLong(1),
"writeConcernMajorityJournalDefault" : true,
"members" : [
{
"_id" : 0,
"host" : "mongo-node-1.domain.com:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "mongo-node-2.domain.com:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "mongo-node-3.domain.com:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"catchUpTimeoutMillis" : -1,
"catchUpTakeoverDelayMillis" : 30000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5d1e36618481a2906eb97171")
}
}
Here is my Status output
# Example output
mongoReplicaSet:PRIMARY> rs.status()
{
"set" : "mongoReplicaSet",
"date" : ISODate("2019-07-10T21:58:51.943Z"),
"myState" : 1,
"term" : NumberLong(11),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1562795931, 2),
"t" : NumberLong(11)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1562795931, 2),
"t" : NumberLong(11)
},
"appliedOpTime" : {
"ts" : Timestamp(1562795931, 2),
"t" : NumberLong(11)
},
"durableOpTime" : {
"ts" : Timestamp(1562795931, 2),
"t" : NumberLong(11)
}
},
"lastStableCheckpointTimestamp" : Timestamp(1562795908, 3),
"members" : [
{
"_id" : 0,
"name" : "mongo1.domain.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 5542,
"optime" : {
"ts" : Timestamp(1562795931, 1),
"t" : NumberLong(11)
},
"optimeDurable" : {
"ts" : Timestamp(1562795931, 1),
"t" : NumberLong(11)
},
"optimeDate" : ISODate("2019-07-10T21:58:51Z"),
"optimeDurableDate" : ISODate("2019-07-10T21:58:51Z"),
"lastHeartbeat" : ISODate("2019-07-10T21:58:51.622Z"),
"lastHeartbeatRecv" : ISODate("2019-07-10T21:58:50.303Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "gl-mongo2.domain.com:27017",
"syncSourceHost" : "gl-mongo2.domain.com:27017",
"syncSourceId" : 1,
"infoMessage" : "",
"configVersion" : 3
},
{
"_id" : 1,
"name" : "mongo2.domain.net:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 5669,
"optime" : {
"ts" : Timestamp(1562795931, 2),
"t" : NumberLong(11)
},
"optimeDate" : ISODate("2019-07-10T21:58:51Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1562790394, 1),
"electionDate" : ISODate("2019-07-10T20:26:34Z"),
"configVersion" : 3,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 2,
"name" : "mongo3.domain.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 5511,
"optime" : {
"ts" : Timestamp(1562795931, 1),
"t" : NumberLong(11)
},
"optimeDurable" : {
"ts" : Timestamp(1562795931, 1),
"t" : NumberLong(11)
},
"optimeDate" : ISODate("2019-07-10T21:58:51Z"),
"optimeDurableDate" : ISODate("2019-07-10T21:58:51Z"),
"lastHeartbeat" : ISODate("2019-07-10T21:58:51.686Z"),
"lastHeartbeatRecv" : ISODate("2019-07-10T21:58:50.938Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mongo2.enseva-labs.net:27017",
"syncSourceHost" : "mongo2.domain.com:27017",
"syncSourceId" : 1,
"infoMessage" : "",
"configVersion" : 3
}
],
"ok" : 1,
"operationTime" : Timestamp(1562795931, 2),
"$clusterTime" : {
"clusterTime" : Timestamp(1562795931, 2),
"signature" : {
"hash" : BinData(0,"K2p6/W2VrP3eycBcW9xzneDo9Gc="),
"keyId" : NumberLong("6709860293658279938")
}
}
}
EDIT:
I forgot to ask , when you created Mongo cluster did you go through Mongo shell
Example, this is from my PRIMARYGUY.
# Enter the following command to create the replica set.
> rs.initiate()
# Enter the following command to add other nodes, where the other node is named,
# for example, "mongo-node-2" and the domain is domain.com.
> rs.add("mongo-node-2.domain.com")
> rs.initiate()
# Enter the following command to add other nodes, where the other node is named,
# for example, "mongo-node-3" and the domain is domain.com.
> rs.add("mongo-node-3.domain.com")