No temporary password in mysqld.log

Question

I used mysql 5.7.16 community and centos 7.

I'm following a video tutorial to install mysql:

1. wget http://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
2. yum localinstall dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
3. yum repolist enabled | grep "mysql.-community."
4. yum install mysql-community-server
5. service mysqld start

After starting mysql, I can see status is alive (running) with service mysqld status.

But I can' get anything by: grep 'temporary password' /var/log/mysqld.log

msyqld.log (ignore normal logs):

[Warning] InnoDB: Cannot open table mysql/plugin from the internal data dictionary of InnoDB though the .frm file for the table exists.
mysqld: Table 'mysql.plugin' doesn't exist

[ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

[Warning] InnoDB: Cannot open table mysql/gtid_executed from the internal data dictionary of InnoDB though the .frm file for the table exists.
mysqld: Table 'mysql.gtid_executed' doesn't exist

[Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.

[Warning] InnoDB: Cannot open table mysql/server_cost from the internal data dictionary of InnoDB though the .frm file for the table exists.

[Warning] Failed to open optimizer cost constant tables

[Warning] InnoDB: Cannot open table mysql/time_zone_leap_second from the internal data dictionary of InnoDB though the .frm file for the table exists.

[Warning] Can't open and lock time zone table: Table 'mysql.time_zone_leap_second' doesn't exist trying to live without them

[Warning] InnoDB: Cannot open table mysql/servers from the internal data dictionary of InnoDB though the .frm file for the table exists.

[ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist

Appreciate any help!

Answer 1

I figured this out.

1. I install centos 7 with mysql selected, mysql version is 5.5.
2. Remove it by: yum remove mysql-serverl.
3. Install 5.7.16 by this tutorial.
4. Has these error.
5. Yum remove mysql-community-server, install 5.7 again.
6. Still has these error.
7. Yum remove mysql-community-server, but delete dir /var/lib/mysql.
8. Then install again, it works.

The key point is need to remove /var/lib/mysql manually.

Answer 2

If there is no password, don't worry. Do it.

sudo mysql_secure_installation

just press the enter as you don't have password.

Answer 3

I simply restarted mysql and searched:

service mysqld start

grep 'temporary password' /var/log/mysqld.log

Default password was displayed.