[root@wallet01 ~]# mysql -uroot -p
Enter password:

mysql> grant all privileges on *.* to 'root'@'wallet01' identified by 'abcd@1234';
Query OK, 0 rows affected, 1 warning (0.05 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)

[root@wallet01 ~]# yum install -y mysql-shell

[root@wallet01 ~]#  mysqlsh --log-level=DEBUG3
MySQL Shell 8.0.18

Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
Other names may be trademarks of their respective owners.

Type '\help' or '\?' for help; '\quit' to exit.

 MySQL  JS > shell.connect('root@wallet01:3306')
Creating a session to 'root@wallet01:3306'
Please provide the password for 'root@wallet01:3306': *********
Save password for 'root@wallet01:3306'? [Y]es/[N]o/Ne[v]er (default No): y
Fetching schema names for autocompletion... Press ^C to stop.
Your MySQL connection id is 290
Server version: 5.7.27-log MySQL Community Server (GPL)
No default schema selected; type \use <schema> to set one.
<ClassicSession:root@wallet01:3306>

 MySQL  wallet01:3306  JS > var cluster = dba.createCluster('walletCluster', {adoptFromGR: true})
A new InnoDB cluster will be created based on the existing replication group on instance 

'wallet01:3306'.

Creating InnoDB cluster 'walletCluster' on 'wallet01:3306'...

Adding Seed Instance...
Adding Instance 'wallet03:3306'...
Adding Instance 'wallet01:3306'...
Adding Instance 'wallet02:3306'...
Resetting distributed recovery credentials across the cluster...
Cluster successfully created based on existing replication group.

 MySQL  wallet01:3306  JS > cluster.status();
{
    "clusterName": "walletCluster", 
    "defaultReplicaSet": {
        "name": "default", 
        "primary": "wallet01:3306", 
        "ssl": "DISABLED", 
        "status": "OK", 
        "statusText": "Cluster is ONLINE and can tolerate up to ONE failure.", 
        "topology": {
            "wallet01:3306": {
                "address": "wallet01:3306", 
                "mode": "R/W", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }, 
            "wallet02:3306": {
                "address": "wallet02:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }, 
            "wallet03:3306": {
                "address": "wallet03:3306", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE"
            }
        }, 
        "topologyMode": "Single-Primary"
    }, 
    "groupInformationSourceMember": "wallet01:3306"
}

 MySQL  wallet01:3306  JS > \quit
Bye!

[root@wallet01 ~]# yum install -y mysql-router 
[root@wallet01 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router01
Please enter MySQL password for root: 
WARNING: The MySQL server does not have SSL configured and metadata used by the router may be 

transmitted unencrypted.
# Reconfiguring system MySQL Router instance...

- Checking for old Router accounts
  - No prior Router accounts found
- Creating mysql account 'mysql_router1_a8933v9tcn8v'@'%' for cluster management
- Storing account in keyring
- Adjusting permissions of generated files
- Creating configuration /etc/mysqlrouter/mysqlrouter.conf

# MySQL Router 'router01' configured for the InnoDB cluster 'walletCluster'

After this MySQL Router has been started with the generated configuration

    $ /etc/init.d/mysqlrouter restart
or
    $ mysqlrouter -c /etc/mysqlrouter/mysqlrouter.conf

the cluster 'walletCluster' can be reached by connecting to:

## MySQL Classic protocol

- Read/Write Connections: localhost:6446
- Read/Only Connections:  localhost:6447

## MySQL X protocol

- Read/Write Connections: localhost:64460
- Read/Only Connections:  localhost:64470

Existing configuration backed up to '/etc/mysqlrouter/mysqlrouter.conf.bak'

[root@wallet01 ~]# /etc/init.d/mysqlrouter start
Starting mysqlrouter:                                      [  OK  ]

[root@wallet01 ~]# /etc/init.d/mysqlrouter status
mysqlrouter (pid  24451) is running...

[root@wallet02 ~]# yum install -y mysql-router 
[root@wallet02 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router02 

[root@wallet02 ~]# /etc/init.d/mysqlrouter start
Starting mysqlrouter:                                      [  OK  ]

[root@wallet02 ~]# /etc/init.d/mysqlrouter status
mysqlrouter (pid  6906) is running...

[root@wallet03 ~]# yum install -y mysql-router 
[root@wallet03 ~]# mysqlrouter --bootstrap root@wallet01:3306 --user=mysqlrouter --name=router03

[root@wallet03 ~]# /etc/init.d/mysqlrouter start
Starting mysqlrouter:                                      [  OK  ]

[root@wallet03 ~]# /etc/init.d/mysqlrouter status
mysqlrouter (pid  18081) is running...