After mysql installation, we need to change the password of root as below

1. initial mysql like below, With the --initialize-insecure option, no root password is generated.

[LAB] root@jptkytcdh01vl /etc/init.d # /usr/sbin/MysqLd --initialize-insecure --user=MysqL --datadir=/var/lib/MysqL

2018-08-03T01:26:56.052349Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2018-08-03T01:26:56.054339Z 0 [ERROR] --initialize specified but the data directory has files in it. Aborting.

2018-08-03T01:26:56.054378Z 0 [ERROR] Aborting

 

2. got error as above, need to move existing datadir first.

 

mv /var/lib/MysqL /var/lib/MysqL_20180803

 

[LAB] root@jptkytcdh01vl /etc/init.d # /usr/sbin/MysqLd --initialize-insecure --user=MysqL --datadir=/var/lib/MysqL

 

[LAB] root@jptkytcdh01vl /etc/init.d # service MysqLd start

Starting MysqLd:                                           [  OK  ]

 

3. then login and reset the password.

 

[LAB] root@jptkytcdh01vl /etc/init.d # MysqL -u root

Welcome to the MysqL monitor.  Commands end with ; or \g.

Your MysqL connection id is 3

Server version: 5.7.23 MysqL Community Server (GPL)

 

copyright (c) 2000, 2018, 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 '\h' for help. Type '\c' to clear the current input statement.

 

MysqL>

 

 

MysqL> alter user 'root'@'localhost' identified by 'root';

Query OK, 0 rows affected (0.00 sec)

 

Doc.

https://dev.MysqL.com/doc/refman/5.7/en/data-directory-initialization-MysqLd.html