dosubot[bot] commented on issue #7808:
URL:
https://github.com/apache/incubator-devlake/issues/7808#issuecomment-2261163618
<!-- Answer -->
It seems like the authentication error persists. Before proceeding with a
clean install, let's ensure that the MySQL user `merico` has the correct
permissions and that the credentials are correct.
1. **Verify MySQL Credentials and Permissions**:
- Log in to MySQL as the root user:
```sh
mysql -u root -p
```
- Once logged in, check if the `merico` user exists and has the necessary
permissions:
```sql
SELECT user, host FROM mysql.user WHERE user = 'merico';
SHOW GRANTS FOR 'merico'@'localhost';
```
- If the user does not exist or lacks permissions, you can create the
user and grant the necessary permissions:
```sql
CREATE USER 'merico'@'localhost' IDENTIFIED BY 'merico';
GRANT ALL PRIVILEGES ON lake.* TO 'merico'@'localhost';
FLUSH PRIVILEGES;
```
2. **Check MySQL Configuration**:
- Ensure that the MySQL server is configured to accept connections from
`localhost`. Check the MySQL configuration file (usually located at
`/etc/mysql/my.cnf` or `/etc/mysql/mysql.conf.d/mysqld.cnf`) for the
`bind-address` setting. It should be set to `127.0.0.1` or `0.0.0.0` to allow
connections from localhost.
If the above steps do not resolve the issue, you can proceed with a clean
install of MySQL:
### Clean Install MySQL
1. **Uninstall MySQL**:
- On Ubuntu/Debian:
```sh
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo rm -rf /etc/mysql /var/lib/mysql
sudo deluser mysql
sudo delgroup mysql
```
- On CentOS/RHEL:
```sh
sudo yum remove mysql-server mysql-client mysql-common
sudo rm -rf /etc/mysql /var/lib/mysql
sudo userdel mysql
sudo groupdel mysql
```
2. **Install MySQL**:
- On Ubuntu/Debian:
```sh
sudo apt-get update
sudo apt-get install mysql-server
```
- On CentOS/RHEL:
```sh
sudo yum install mysql-server
```
3. **Secure MySQL Installation**:
```sh
sudo mysql_secure_installation
```
4. **Create the `merico` User and Database**:
- Log in to MySQL as the root user:
```sh
mysql -u root -p
```
- Create the `merico` user and grant permissions:
```sql
CREATE USER 'merico'@'localhost' IDENTIFIED BY 'merico';
CREATE DATABASE lake;
GRANT ALL PRIVILEGES ON lake.* TO 'merico'@'localhost';
FLUSH PRIVILEGES;
```
After completing these steps, try running the `mysqldump` command again:
```sh
mysqldump -u merico -pmerico lake > db.sql
```
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