A bash script to initiate a replica set with 3 hosts we created earlier

elections-initiate.sh

$BIN_VERSION/bin/mongo --port 27000 <<EOF
rs.initiate({
 _id: 'rs0',
 members: [
  { _id: 0, host : 'mon01:27000' },
  { _id: 1, host : 'mon02:27000' },
  { _id: 2, host : 'mon03:27000' }
] })
EOF
# MongoDB shell version v3.6.5
# connecting to: mongodb://127.0.0.1:27000/
# MongoDB server version: 3.6.5
# {
#   "ok" : 1,
#   "operationTime" : Timestamp(1529022819, 1),
#   "$clusterTime" : {
#     "clusterTime" : Timestamp(1529022819, 1),
#     "signature" : {
#       "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
#       "keyId" : NumberLong(0)
#     }
#   }
# }
# bye
$BIN_VERSION/bin/mongo --port 27000
# rs0:PRIMARY>
rs.isMaster().me
# mon01:27000