MariaDB [(none)]> select * from mysql.wsrep_allowlist;

+----------------+

| ip             |

+----------------+

| 192.168.100.10 |

| 192.168.100.20 |

| 192.168.100.30 |

+----------------+

3 rows in set (0.011 sec)

MariaDB [(none)]> show variables like 'wsrep_allowlist';

+-----------------+-------------------------------+

| Variable_name   | Value                         |

+-----------------+-------------------------------+

| wsrep_allowlist | 192.168.100.10,192.168.100.20 |

+-----------------+-------------------------------+

1 row in set (0.002 sec)

MariaDB [(none)]> \q

Bye

vagrant@node1:~$ grep wsrep_allowlist my.cnf 

wsrep_allowlist="192.168.100.10,192.168.100.20"

vagrant@node1:~$