1、 MySQL basic installation

Crying steamed bread 2021-08-08 21:55:21
mysql basic installation


One 、 build mysql database

mkdir /data
tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
mv mysql-8.0.19-linux-glibc2.12-x86_64 /data/mysql

Add environment variables

echo 'export PATH=/data/mysql/bin:$PATH
'>>/etc/profile
source /etc/profile

Create user

useradd mysql  
mkdir /data/mysql/data # Create a data directory
chown -R mysql.mysql /data # take /data Directory permissions granted to mysql user

Two 、 Initialize database

1、 Initialization data , Initialize the administrator's temporary password

mysqld --initialize  --user=mysql --basedir=/data/mysql --datadir=/data/mysql/data

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5.7 Start ,MySQL It's brand new The security mechanism of passwords :
1. Once the initialization is complete , A temporary password will be generated ( Display on screen , And I'll put a copy in my diary )
2. Password complexity : length : exceed 12 position ? Complexity : Chaotic combination of characters
3. stay 5.7.11 After version, expire the password. The default value is from 360 Turned into 0 That is, it will never expire

2、 Initialization data , The initialization administrator's password is empty

mysqld --initialize-insecure  --user=mysql --basedir=/data/mysql --datadir=/data/mysql/data

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3、 ... and 、 Configure the startup file and start the database

cat > /etc/my.cnf <<EOF
[mysqld]
user=mysql
basedir=/data/mysql
datadir=/data/mysql/data
server_id=6
port=3306
socket=/tmp/mysql.sock
[mysql]
socket=/tmp/mysql.sock
prompt=3306 [\\d]>
EOF

1、 Direct start

/data/mysql/bin/mysqld --defaults-file=/etc/my.cnf &

2、 adopt mysql The built-in startup script starts

cp /data/mysql/support-files/mysql.server /etc/init.d/mysqld
chmod +x /etc/init.d/mysqld
service mysqld start

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Set boot up
chkconfig --level 35 mysqld on
chmod +x /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
chkconfig --list

3、 Use systemd management mysql

cat > /etc/systemd/system/mysqld.service <<EOF
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=mysql
Group=mysql
ExecStart=/data/mysql/bin/mysqld --defaults-file=/etc/my.cnf
LimitNOFILE = 5000
EOF
systemctl daemon-reload
systemctl start mysqld
systemctl status mysqld

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systemctl enable mysqld.service # Add power on self start

Four 、 Start database

1、 If it is initialized with an administrator temporary password

mysql -uroot -p'pEckoe?q#4Kd'
alter user root@'localhost' identified by '123';
flush privileges;

2、 If the administrator empty password is used to initialize

[root@db01 ~]# mysqladmin -uroot -p password 123
Enter password:  ## Just go straight back , The password is empty.

5、 ... and 、 If the administrator user password is forgotten

Stop the database first

systemctl stop mysqld

--skip-grant-tables ## Skip Authorization Form
--skip-networking ## Skip remote login , Prevent malicious login of remote users
mysqld_safe --skip-grant-tables --skip-networking & # At this time, any password can log in to the database

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mysql ## Direct input mysql You can log in

alter user root@'localhost' identified by '1234';
flush privileges;
alter user root@'localhost' identified by '1234'; # It must be done again, or it won't take effect

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1、 If you use service management mysql

service mysqld restart # Just restart

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2、 If you use systemctl, Direct restart can't stop mysqld_safe

mysqladmin -uroot -p1234 shutdown

systemctl start mysqld

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