Install mysql8.0.13 version under Linux CentOS7 system

Foreword

I recently sorted out some steps and problems encountered in installing mysql8.0.13 under Linux CentOS7 system, and share with you!

One

Installation and error handling

1. Go to the https://www.mysql.com/downloads/msyql download page and select the community version

2. Check the linux version, select the corresponding version to download

3. Copy the downloaded file mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz to a directory on the linux server, unzip it, and copy it to the usr/local directory, and rename it to mysql

[ root@VM_0_14_centos mysql]# tar -xvf mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz
[ root@VM_0_14_centos mysql]# cp -rv mysql-8.0.13-linux-glibc2.12-x86_64 /usr/local
[ root@VM_0_14_centos mysql]# cd /usr/local 
[ root@VM_0_14_centos local]# mv mysql-8.0.13-linux-glibc2.12-x86_64 mysql

4. Add mysql user

useradd -s /sbin/nologin -M mysql

5. msyql initialization

/usr/local/mysql/bin/mysqld --initialize --user=mysql

A temporary password will be generated at this time

[ root@VM_0_14_centos mysql]# /usr/local/mysql/bin/mysqld --initialize --user=mysql
2019- 01- 20 T10:56:07.718326Z 0[System][MY-013169][Server]/usr/local/mysql/bin/mysqld(mysqld 8.0.13) initializing of server in progress as process 58262019-01-20T10:56:16.915217Z 5[Note][MY-010454][Server] A temporary password is generated for root@localhost: twi=Tlsi<0O!2019-01-20T10:56:20.410563Z 0[System][MY-013170][Server]/usr/local/mysql/bin/mysqld(mysqld 8.0.13) initializing of server has completed

6. Copy startup and shutdown scripts

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

7. Modify the configuration file, save and exit wq

vim /etc/my.cnf
[ mysqld]
 basedir =/usr/local/mysql   
 datadir =/var/lib/mysql
 socket =/var/lib/mysql/mysql.sock
 character-set-server=utf8
 [ client]
 socket =/var/lib/mysql/mysql.sock
 default-character-set=utf8

8. Start the database service

service mysqld start

Report an error

mysqld_safe Directory '/var/lib/mysql'for UNIX socket file don't exists.

One is because there is no /var/lib/mysql directory, and the other is because there is no write permission, the mysql.sock file cannot be generated.

[ root@VM_0_14_centos lib]# mkdir mysql
[ root@VM_0_14_centos lib]# chmod 777/var/lib/mysql

Run service mysqld start again and report another error

Starting MySQL. ERROR! The server quit without updating PID file(/var/lib/mysql/VM_0_14_centos.pid).

Print out the specific error message

[ root@VM_0_14_centos mysql]# cat VM_0_14_centos.err
2019- 01- 20 T11:11:45.906800Z 0[System][MY-010116][Server]/usr/local/mysql/bin/mysqld(mysqld 8.0.13) starting as process 77882019-01-20T11:11:45.910813Z 0[Warning][MY-013242][Server]--character-set-server:'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.2019-01-20T11:11:45.925456Z 1[ERROR][MY-011011][Server] Failed to find valid data directory.2019-01-20T11:11:45.925586Z 0[ERROR][MY-010020][Server] Data Dictionary initialization failed.2019-01-20T11:11:45.925600Z 0[ERROR][MY-010119][Server] Aborting
2019- 01- 20 T11:11:45.926342Z 0[System][MY-010910][Server]/usr/local/mysql/bin/mysqld: Shutdown complete(mysqld 8.0.13)  MySQL Community Server - GPL.2019-01-20T11:12:00.049920Z 0[System][MY-010116][Server]/usr/local/mysql/bin/mysqld(mysqld 8.0.13) starting as process 79752019-01-20T11:12:00.052469Z 0[Warning][MY-013242][Server]--character-set-server:'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.2019-01-20T11:12:00.060600Z 1[ERROR][MY-011011][Server] Failed to find valid data directory.2019-01-20T11:12:00.060745Z 0[ERROR][MY-010020][Server] Data Dictionary initialization failed.2019-01-20T11:12:00.060759Z 0[ERROR][MY-010119][Server] Aborting
2019- 01- 20 T11:12:00.061610Z 0[System][MY-010910][Server]/usr/local/mysql/bin/mysqld: Shutdown complete(mysqld 8.0.13)  MySQL Community Server - GPL.

Can't see the specific problem, so run service --status-all, there is an error message

ERROR! MySQL is not running, but lock file(/var/lock/subsys/mysql) exists

Some netizens said that it was enough to delete the file, but it was useless if I deleted it.

Then check the err file just now, the key error should be these two lines

2019- 01- 20 T11:11:45.925456Z 1[ERROR][MY-011011][Server] Failed to find valid data directory.2019-01-20T11:11:45.925586Z 0[ERROR][MY-010020][Server] Data Dictionary initialization failed.

So I searched for my.cnf. The configuration related to the data directory is datadir=/var/lib/mysql. I tried to delete this line. The result was successful, and the service mysqld start was successful!

9. mysql -u root -p log in mysql error report

The solution is as follows:

cd /usr/local/bin  
ln -fs /usr/local/mysql/bin/mysql mysql

10. show databases error

you must reset your password using ALTER USER statement before executing this statement.

Solution:

alter user user() identified by '123456';

11. Cannot log in to mysql remotely with ip, but can only log in with localhost in linux server

Modify permissions configuration

grant all privileges on *.* to 'root'@'%' identified by '123456';

But error

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by '123456' at line 1

Solution:

use mysql;
update user set host ='%' where user ='root';
flush privileges;

Then an error is reported when connecting with Navicat

Client does not support authentication protocol requested by server; consider upgrading MySQL client

Solution:

ALTER USER 'root'@'*' IDENTIFIED WITH mysql_native_password BY '123456';