replication - How to configure a replica set with MongoDB -

i've got problem can't solve. partly because can't explain right terms. i'm new sorry clumsy question.

below can see overview of goal.

i want configure replication set in mongodb tried

use local db.dropdatabase()  config = { _id: "rs0", members:[ {_id: 0, host: 'localhost:27017'}] }  rs.initiate(config)

i hope every thing correct here showing following error message

{ "errmsg" : "server not running --replset", "ok" : 0 }

anything wrong did here ?

any ideas ?

you can follow mongodb manual setup replica set. it's pretty clear. here critical steps described below:

change configuration file , add following line.don't mess master/slave replication, because replica set meant replacement of master/slave replication. may want remove master/slave related config configuration files.
```
replset = [set name] 
```

restart mongod instance:

systemctl restart mongodb // or service mongod restart

go local database , initiate replica set. don't pass initiate function, , mongodb handle well. note use hostname name of current instance , know it's not easy change. may want change host name before doing so.
```
use local rs.initiate() 
```

that's it. set go. if have other member join set, need 1/2 steps, , go primary instance , type:

rs.add("hostname:port")

only when want change configs of replica set, need type:

var conf = rs.conf(); // change conf here rs.reconfig(conf);

note lead server offline little bit time. if doing online, careful.

HR