mongodb replica set & sharding

mongodb replica set & sharding

### start server
    ```sh
    sudo mongod --reset --replSet replsetname --dbpath dbfilepath --port serverport --keyFile authkeyfile --auth
    ```

### show config
    ```javascript
    rs.conf()
    ```

### add replica
    ```javascript
    rs.add("replica_server:9090");
    rs.add({id:3, port:"replica_server:9090", abiterOnly:true/false, priority:1, hidden:true/false, });
    rs.addArb("broadway:27017"); // arbiter
    ```
### reconfig
    ```javascript
    config = rs.conf();
    // change config's content
    // ...
    config.version++;
    rs.reconfig(config);
    ```

mongodb_replica_set_and_sharding.markdown

start server

sudo mongod --reset --replSet replsetname --dbpath dbfilepath --port serverport --keyFile authkeyfile --auth

show config

rs.conf()

add replica

rs.add("replica_server:9090");
rs.add({id:3, port:"replica_server:9090", abiterOnly:true/false, priority:1, hidden:true/false, });
rs.addArb("broadway:27017"); // arbiter

reconfig

config = rs.conf();
// change config's content
// ...
config.version++;
rs.reconfig(config);