The **MySql server PID file could not be found error** occurs when `MySQL` cannot find the `PID` file. It may also occur if the `MySQL` process is killed abruptly. Since the process does not end properly, the `PID` file is mismatched.

# Solution
## Step 1. Check for the parameter `PID`-file and create `/var/run/mysqld/`
Check where your `PID`-file points to. You can do this by running:
```
my.cnf
```

If the parameter is not present, set it as shown below:
```
pid-file    = /var/run/mysqld/mysqld.pid
```

Next, create the following directory and give it the appropriate permissions, as follows:

```
mkdir /var/run/mysqld
touch /var/run/mysqld/mysqld.pid
chown -R mysql:mysql /var/run/mysqld
```

## Step 2. Change ownership of the `MySQL` folder
Change the ownership of the MySQL folder: 
```
sudo chown -R _mysql:_mysql mysql
```

## Step 3. Change permissions of the `MySQL` folder
You can change the permissions of the `MySQL` folder by typing:
```
sudo chmod 777 /usr/local/var/mysql
``` 

## Change permissions of /usr/local/var
If the above solutions do not work, try changing the permissions of `/usr/local/var` by typing:
```
sudo chmod 777 /usr/local/var
``` 




How to fix the MySQL server PID file could not be found error

Solution

Step 1. Check for the parameter PID-file and create /var/run/mysqld/

Step 2. Change ownership of the MySQL folder

Step 3. Change permissions of the MySQL folder

Change permissions of /usr/local/var

Step 1. Check for the parameter `PID`-file and create `/var/run/mysqld/`

Step 2. Change ownership of the `MySQL` folder

Step 3. Change permissions of the `MySQL` folder