How to reset mariadb root password on using Galera Cluster system?

e.g. reset root password
two machines in a cluster

1st step:
-> Activate "safe_to_bootstrap" parameter on first machine
# vi /var/lib/mysql/grastate.dat
safe_to_bootstrap: 1

2nd step on first/second machine:
# systemctl stop mariadb

3rd step:
-> Run database in safe mode on first machine
# /usr/bin/mysqld_safe --skip-grant-tables --wsrep-new-cluster "${@:2}" > /dev/null 2>&1 & 

4th step:
-> Note the process id of mysql service
# ps -ef | grep mysql

5th step:
-> Connect mysql terminal then run following commands on first machine
# mysql -u root
 use mysql;
 update user SET PASSWORD=PASSWORD("password") WHERE USER='root';
 flush privileges;
 exit

6th step:
-> Try to connect with new password on first machine
# mysql -u root -ppassword

7th step:
-> kill the odd service on first machine
# kill -9 1111

8th step:
-> Start new cluster on first machine
# galera_new_cluster

9th step:
-> Start mariadb on second machine
$ systemctl start mariadb

Done...

Ref:
https://robbinespu.github.io/eng/2018/03/29/Reset_mariadb_root_password.html
https://blog.toonormal.com/2015/11/23/mariadb-cluster-install-notes/

WSREP "Failed to open channel" solution

Error
ERROR WSREP "Failed to open channel 'my_mariadb_cluster'"

Detailed Error
WSREP: gcs/src/gcs.cpp:gcs_open():1458: Failed to open channel 'my_mariadb_cluster' at 'gcomm://10.10.10.10,10.10.10.11': -110 (Connection timed out)

Solution
On the first node: (e.g. node-1)
-> Stop mariadb service if it hangs
# systemctl stop mariadb.service

-> Make sure "safe_to_bootstrap" value is "1"
# cat /var/lib/mysql/grastate.dat
safe_to_bootstrap: 1

-> Run following command for starting cluster as new
# galera_new_cluster

-> mariadb service should be started automatically
# systemctl status mariadb.service

-> note wsrep_last_committed number by looking system table
# mysql -u root -p
> show status like 'wsrep_%';

-> note uuid number
# cat /var/lib/mysql/grastate.dat

On the second node: (e.g. node-2)
-> Stop mariadb service if it hangs
# systemctl stop mariadb.service

-> uuid and seqno (wsrep_last_committed) should be same with node-1
# vi /var/lib/mysql/grastate.dat
uuid: 0000
seqno: 100

-> start mariadb service
# systemctl start mariadb.service