Error while changing password using mysqladmin command:
[user@server ~]# /usr/bin/mysqladmin -u root -p"$MYSQL_TEMP_PASS" password "$MYSQL_ROOT_PASSWORD" mysqladmin: [Warning] Using a password on the command line interface can be insecure. Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety. mysqladmin: unable to change password; error: 'Percona XtraDB Cluster doesn't allow use of CURRENT_USER/USER function for USER operation while operating in cluster mode'
Solution:
[user@server ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 19
Server version: 5.7.27-30-57-log
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'SOME_NEW_PASSWORD';
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql> QUIT