#### Follow steps from the report

 ./dbdeployer --sandbox-binary=/export/home/tmp/ushastry/ deploy replication --topology=group 8.0.32 --my-cnf-options="group_replication_ssl_mode=REQUIRED" --my-cnf-options="ssl_ca=ca.pem" --my-cnf-options="ssl_cert=server-cert.pem" --my-cnf-options="ssl_key=server-key.pem"
Installing and starting node 1
... sandbox server started
Installing and starting node 2
... sandbox server started
Installing and starting node 3
... sandbox server started
$HOME/sandboxes/group_msb_8_0_32/initialize_nodes
# Node 1 # reset master; CHANGE MASTER TO MASTER_USER='rsandbox', MASTER_PASSWORD='rsandbox'  FOR CHANNEL 'group_replication_recovery';
# Node 2 # reset master; CHANGE MASTER TO MASTER_USER='rsandbox', MASTER_PASSWORD='rsandbox'  FOR CHANNEL 'group_replication_recovery';
# Node 3 # reset master; CHANGE MASTER TO MASTER_USER='rsandbox', MASTER_PASSWORD='rsandbox'  FOR CHANNEL 'group_replication_recovery';

# Node 1 # SET GLOBAL group_replication_bootstrap_group=ON;
# Node 1 # START GROUP_REPLICATION;
# Node 2 # START GROUP_REPLICATION;
# Node 3 # START GROUP_REPLICATION;
# Node 1 # SET GLOBAL group_replication_bootstrap_group=OFF;
# Node 1 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
# Node 2 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
# Node 3 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
Group Replication directory installed in $HOME/sandboxes/group_msb_8_0_32
run 'dbdeployer usage multiple' for basic instructions'


# Then stop one node from your group:


[umshastr@support-cluster03:~/work/binaries/utils]$ ~/sandboxes/group_msb_8_0_32/node3/stop;
stop /home/umshastr/sandboxes/group_msb_8_0_32/node3


## Then connect to group replication port (33061 by default; in the sandbox env the port was something else like 23358) on node1 with a simple mysql client:

 bin/mysql -h127.0.0.1 -uroot -P23233 -pmsandbox
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 33
Server version: 8.0.32 MySQL Community Server - GPL

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>


## 
Finally, in a separate terminal, try bringing back node3 to the group, and you will see it's not possible. 

 ~/sandboxes/group_msb_8_0_32/node3/start;
... sandbox server started
[umshastr@support-cluster03:~/work/binaries/utils]$

 ~/sandboxes/group_msb_8_0_32/node3/use -e "START GROUP_REPLICATION";
[umshastr@support-cluster03:~/work/binaries/utils]$

## Nothing is observed

pstack $(cat ~/sandboxes/group_msb_8_0_32/node1/data/*pid) |grep -iB3 -A7 BIO_read
pstack $(cat ~/sandboxes/group_msb_8_0_32/node2/data/*pid) |grep -iB3 -A7 BIO_read

## Confirmed that node 3 has joined

./check_nodes
# Node 1 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
# Node 2 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
# Node 3 # select * from performance_schema.replication_group_members
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 00023233-1111-1111-1111-111111111111 | 127.0.0.1   |       23233 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023234-2222-2222-2222-222222222222 | 127.0.0.1   |       23234 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
| group_replication_applier | 00023235-3333-3333-3333-333333333333 | 127.0.0.1   |       23235 | ONLINE       | PRIMARY     | 8.0.32         | XCom                       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+