Table of contents
1. Change the source before installing MYSQL
2. The installation is complete
3. Unable to log in after installation
3.2 Switch database after login
3.3 Change the password (note that the account number and password are in double quotes)
3.5 Then refresh to make the configuration take effect
1. Change the source before installing MYSQL
1. Back up the previous source of the system, or not, comment out the previous source
cp /etc/apt/sources.list /etc/apt/sources.list.bak2. Modify the source file /etc/apt/sources.list
vim /etc/apt/sources.listDelete the original content and paste the source content below.
3. Here are two good domestic sources recommended
3.1 Ali source (arm64, fast, recommended)
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial main
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial main
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates main
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial universe
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-security universe
deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-security universe3.2 Huawei source (arm64, fast speed, choose one of the two)
deb https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
## Not recommended
# deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse
# deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse4. Update warehouse
apt-get update4.1 Handling Error Reporting
There may be an error
The following signatures cannot be verified because the public key is not available...
The following command solves it:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 40976EAF437D05B5 3B4FE6ACC0B21F325. Clear software repository cache
apt-get clean6. Update software repository
apt-get updateDone, you can install MYSQL
2. Install MYSQL
1. Installation
sudo apt-get install mysql-server //服务端
sudo apt-get install mysql-client //客户端
sudo apt-get install libmysqlclient-dev //程序编译时链接的库
2. The installation is complete
After the installation is complete, the dpkg command checks the status
dpkg -l | grep mysql
If the following information is output, the installation is successful
ii mysql-client-5.7 5.7.39-0ubuntu0.18.04.2 arm64 MySQL database client binaries
ii mysql-client-core-5.7 5.7.39-0ubuntu0.18.04.2 arm64 MySQL database core client binaries
ii mysql-common 5.8+1.0.5 all MySQL database common files, e.g. /etc/mysql/my.cnf
ii mysql-server 5.7.39-0ubuntu0.18.04.2 all MySQL database server (metapackage depending on the latest version)
ii mysql-server-5.7 5.7.39-0ubuntu0.18.04.2 arm64 MySQL database server binaries and system database setup
ii mysql-server-core-5.7 5.7.39-0ubuntu0.18.04.2 arm64 MySQL database server binaries
Start mysql with the following command
service mysql start
After startup, use the following command to view the status
sudo netstat -anp | grep mysql
The following display shows that the startup is successful:
tcp6 0 0 :::3306 :::* LISTEN 27608/mysqld
unix 2 [ ACC ] STREAM LISTENING 648125 27608/mysqld /var/run/mysqld/mysqld.sock
unix 3 [ ] STREAM CONNECTED 648111 27608/mysqld Log in with the command
mysql -u root -p
Enter the password to log in. If you have not set a password before, please see step 3
aaron@aaron-Raytine-PC:~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.7.30-0ubuntu0.18.04.1 (Ubuntu)
Copyright © 2000, 2020, 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>
3. Unable to log in after installation
3.1 Reasons
Reason one (mostly):
You installed it as root: Enter: mysql -uroot on the local command line to log in directly, and then modify the user name and password.
Reason two:
Use the mysql -u root -p command but do not know the root password because it has not been set before. At this time, configure the environment and set the root password.
1. First, log in by ignoring the password and open the configuration file
sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf2. Add skip-grant-tables at the end
# # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem skip-grant-tables -- 插入 --3. Save and exit
4. Restart the following mysql services
sudo service mysql stop
sudo service mysql start
5. Log in again
mysql -u mysqlGo to step 3.2, and comment out skip-grant-tables after all steps are executed
Reason 3: Did not uninstall the previous mysql cleanly
Remove MySQL completely
Before deleting mysql, you need to delete /var/lib/mysql and /etc/mysqlubuntu
Stop the mysql service first
systemctl stop mysqlNeed to enter the following commands
sudo rm /var/lib/mysql/ -R sudo rm /etc/mysql/ -R sudo apt-get autoremove mysql* --purge sudo apt-get remove apparmorMake sure there is no mysql folder to ignore this step
sudo find / -name mysqlinstall again
sudo apt-get install mysql-server //服务端 sudo apt-get install mysql-client //客户端 sudo apt-get install libmysqlclient-dev //程序编译时链接的库
3.2 Switch database after login
Log in
~$ sudo mysql -u root -p
Enter password:
Enter directly
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.39-0ubuntu0.18.04.2 (Ubuntu)
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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>
Change to database
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>
3.3 Change the password (note that the account number and password are in double quotes)
mysql> update user set authentication_string=PASSWORD("123456") where user="root";
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
3.4 Check the user
select user,host from mysql.user;
When the following information appears, the configuration is complete
mysql> select user,host from mysql.user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| debian-sys-maint | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
3.5 Then refresh to make the configuration take effect
flush privileges;
3.6 Exit
quit3.7 restart
sudo service mysql restartThree, mysql use test
1. Create a database
mysql> create database joyrun;
Query OK, 1 row affected (0.00 sec)
2. View the current database
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| joyrun |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.00 sec)3. Create a table
mysql> use joyrun
Database changed
mysql> create table tbl_run(id int,name varchar(5),primary key (id));
Query OK, 0 rows affected (0.01 sec)
4. View the structure of the table
mysql> desc tbl_run;
+-------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| name | varchar(5) | YES | | NULL | |
+-------+------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
5. Modify the byte length
mysql> alter table tbl_run modify column name varchar(20);
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> desc tbl_run;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| name | varchar(20) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
6. Chinese fields cannot be added to the table now, only after modifying the character set
修改库字符集：alter database joyrun character set utf8;
修改表字符集：alter table tbl_run character set utf8;
修改字段字符集：alter table tbl_run change name name varchar(20) character set utf8;
7. Add a piece of data
mysql> insert into tbl_run (id,name) values (1,'xiaoming');
Query OK, 1 row affected (0.01 sec)
mysql> select * from tbl_run;
+----+----------+
| id | name |
+----+----------+
| 1 | xiaoming |
+----+----------+
1 row in set (0.00 sec)