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Pod Stuck in CrashLoopBackOff
Database connection timeout
Docker Container won't Start
Kubernetes ingress not working
Redis connection refused
CI/CD pipeline failing

MySQL 1170: Cannot open database.

  1. Check if the MySQL service is running:


- On Linux, run: `sudo systemctl status mysql`
- On Windows, open Services and look for MySQL service.

  1. Verify MySQL server is reachable:


- Run: `mysql -h [hostname] -u [username] -p`

  1. Check database existence:


- Connect to MySQL: `mysql -u [username] -p`
- List databases: `SHOW DATABASES;`
- Ensure the targeted database is listed.

  1. Examine user privileges:


- After connecting to MySQL: `SHOW GRANTS FOR 'youruser'@'yourhost';`

  1. Review error logs for specific error messages:


- Default location on Linux: `/var/log/mysql/error.log`
- On Windows, located in MySQL installation directory, `data` folder.

  1. Check for disk space:


- On Linux: `df -h`
- On Windows: Open This PC and check the disk where MySQL is installed.

  1. Assess MySQL server status and variables:


- Connect to MySQL and run: `SHOW STATUS LIKE 'uptime';` to check if the server is running.
- Check open connections: `SHOW STATUS LIKE 'Threads_connected';`

  1. Repair database in case of corruption (if the database is marked as crashed or corrupted):


- Connect to MySQL and run: `REPAIR TABLE tablename;` for the specific table(s) reported in errors, or
- Use myisamchk for MyISAM tables if the server is stopped: `myisamchk --recover /path/to/table.MYI`

  1. Increase connection limits if too many connections:


- Check max connections: `SHOW VARIABLES LIKE 'max_connections';`
- Temporarily increase: `SET GLOBAL max_connections = [higher number];`

  1. Restart MySQL Service:


- On Linux: `sudo systemctl restart mysql`
- On Windows: Restart the MySQL service from Services.

Perform these actions in sequence, checking after each step if the error persists before proceeding to the next.

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MySQL

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MORE ISSUES

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Debug Your Infrastructure

Get Instant Solutions for Kubernetes, Databases, Docker and more

AWS CloudWatch
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Pod Stuck in CrashLoopBackOff
Database connection timeout
Docker Container won't Start
Kubernetes ingress not working
Redis connection refused
CI/CD pipeline failing

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 debugging in Minutes

— Grab the Ultimate Cheatsheet

(Perfect for DevOps & SREs)

Most-used commands
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MORE ISSUES

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