WP DB connection issue

services:
nginx:
image: nginx:latest
container_name: other7-nginx
ports:
– "5500:80"
networks:
– other-7app-network
volumes:
– ./nginx:/etc/nginx/conf.d
– ./applications/dndw-test:/var/www/dndw-test
depends_on:
– php

php:
build:
context: ./php
container_name: other-7php
volumes:
– ./applications/dndw-test:/var/www/dndw-test
expose:
– "9000"
working_dir: /var/www
networks:
– other-7app-network

ot7mysql2:
image: mysql:8.0
container_name: other-72mysql
environment:
MYSQL_ROOT_PASSWORD: rootpassword
MYSQL_DATABASE: site_db
MYSQL_USER: user
MYSQL_PASSWORD: userpassword
volumes:
– ./mysql/data:/var/lib/mysql
ports:
– "3308:3306"
networks:
– other-7app-network

adminer:
image: adminer
container_name: other-7adminer
restart: always
ports:
– '5501:8080'
networks:
– other-7app-network
depends_on:
– ot7mysql2

networks:
other-7app-network:
driver: bridge

This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at ot7mysql2. This could mean your host’s database server is down.

—

### 1. **Check `wp-config.php` Settings**
Ensure that the `wp-config.php` file in your WordPress application (`applications/dndw-test/wp-config.php`) has the correct database credentials:

define('DB_NAME', 'site_db');
define('DB_USER', 'user');
define('DB_PASSWORD', 'userpassword');
define('DB_HOST', 'ot7mysql2'); // Match the service name in your Docker Compose file

—

### 2. **Database Service Name**
Since you're using Docker Compose, the database host should be the name of the service defined in the Compose file (`ot7mysql2`). Ensure `DB_HOST` in `wp-config.php` matches this.

—

### 3. **Network Configuration**
All your services are connected to the `other-7app-network` network. Verify that this network is active:

docker network ls

If the network does not exist, recreate it with:

docker-compose down
docker-compose up -d

—

### 4. **Check Database Availability**
Access the MySQL container and verify that the database exists:

docker exec -it other-72mysql mysql -u root -p

After logging in:

SHOW DATABASES;

You should see `site_db`. If not, recreate the database:

CREATE DATABASE site_db;
CREATE USER 'user'@'%' IDENTIFIED BY 'userpassword';
GRANT ALL PRIVILEGES ON site_db.* TO 'user'@'%';
FLUSH PRIVILEGES;

—

### 5. **Verify MySQL Port**
Ensure MySQL is running on port `3306` within the container:

docker exec -it other-72mysql netstat -tuln

You should see MySQL listening on `0.0.0.0:3306`.

—

### 6. **Restart and Rebuild Containers**
Sometimes restarting the containers resolves connection issues:

docker-compose down
docker-compose up --build -d

—

### 7. **Inspect Logs**
Check the logs of your containers for errors:

docker logs other-72mysql
docker logs other7-nginx
docker logs other-7php

—

### 8. **Test WordPress Database Connection**
Use the following PHP script to test the connection:

<?php
$servername = "ot7mysql2";
$username = "user";
$password = "userpassword";
$dbname = "site_db";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>

Place it in the `dndw-test` directory and access it through your browser to confirm connectivity.

—

### 9. **Firewall or Configuration Issues**
If the above steps do not work, check for firewall rules on your host or misconfigurations in the MySQL container preventing access.

—

If the issue persists after following these steps, let me know what errors you encounter during testing.

Are you sure you have the correct username and password?
Are you sure you have typed the correct hostname?
Are you sure the database server is running?
If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

—

### 1. **Verify Database Credentials in `wp-config.php`**
Ensure that these credentials exactly match the setup in your MySQL container (`ot7mysql2`):

define('DB_NAME', 'site_db');
define('DB_USER', 'user');
define('DB_PASSWORD', 'userpassword');
define('DB_HOST', 'ot7mysql2');

—

### 2. **Check MySQL Logs**
Inspect the logs of your MySQL container for errors:

docker logs other-72mysql

Look for messages like authentication failures, database not found, or any indication of why the connection might fail.

—

### 3. **Test Database Connection From PHP Container**
Access your PHP container and try connecting to MySQL directly:

docker exec -it other-7php bash
apt update && apt install -y mysql-client
mysql -h ot7mysql2 -u user -p

– Use `userpassword` when prompted for the password.
– If the connection works, you should be able to run `SHOW DATABASES;` and see `site_db`.

—

### 4. **Ping MySQL Container**
From the PHP container, confirm you can ping the MySQL container:

ping ot7mysql2

If you cannot ping it, there may be a network issue.

—

### 5. **Check MySQL Configuration**
Access your MySQL container to verify users and permissions:

docker exec -it other-72mysql mysql -u root -p

Once logged in, check if the user `user` exists and has the correct permissions:

SELECT user, host FROM mysql.user;
SHOW GRANTS FOR 'user'@'%';

Ensure the user exists and has privileges to access `site_db` from `%` (all hosts).

—

### 6. **Recreate the Database and User (If Necessary)**
If the database or user is missing or misconfigured, recreate them:

DROP DATABASE IF EXISTS site_db;
CREATE DATABASE site_db;
DROP USER IF EXISTS 'user'@'%';
CREATE USER 'user'@'%' IDENTIFIED BY 'userpassword';
GRANT ALL PRIVILEGES ON site_db.* TO 'user'@'%';
FLUSH PRIVILEGES;

—

### 7. **Inspect WordPress and PHP Configuration**
Ensure that your PHP container has the necessary extensions for WordPress:

docker exec -it other-7php bash
php -m | grep mysqli

If `mysqli` is not listed, install it in your PHP Dockerfile:

RUN docker-php-ext-install mysqli pdo pdo_mysql

Rebuild the PHP container:

docker-compose build php
docker-compose up -d

—

### 8. **Check for Docker Network Issues**
Verify that all containers are on the same network:

docker network inspect other-7app-network

Ensure both `other-72mysql` and `other-7php` are listed as connected to the network.

—

### 9. **Debugging Tips**
– **Incorrect Hostname:** If `ot7mysql2` doesn't work, try using `127.0.0.1` or `localhost`. However, this is unlikely since the services are in separate containers.
– **MySQL Not Running:** Check the status of the MySQL container:

docker ps | grep other-72mysql

If it's not running, restart it:

docker-compose restart ot7mysql2

—

### 10. **Restart Everything**
Sometimes restarting all containers resolves unexplained issues:

docker-compose down
docker-compose up --build -d

—

### Let Me Know the Results
If the error persists, please provide:
1. Output of `docker logs other-72mysql`.
2. Results of the database connection test from the PHP container.

—

### 1. **Check Database Connectivity From the PHP Container**
Since the MySQL container is running, let’s confirm that the PHP container can communicate with it.

#### a) **Access the PHP Container**
Run the following to get a shell in your PHP container:

docker exec -it other-7php bash

#### b) **Test the Connection**
From inside the PHP container, use the MySQL client to test the connection:

apt update && apt install -y mysql-client
mysql -h ot7mysql2 -P 3306 -u user -p

– Use `userpassword` when prompted for the password.
– If the connection succeeds, you should see the MySQL prompt (`mysql>`). Then, run:

SHOW DATABASES;

If it fails, the issue is with the connection between the containers.

—

### 2. **Verify MySQL User Permissions**
If the database connection fails, it could be due to improper user permissions. Access the MySQL container and verify:

#### a) **Access the MySQL Container**
Run:

docker exec -it other-72mysql mysql -u root -p

Use the root password (`rootpassword`) to log in.

#### b) **Check User and Host**
Verify that the user `user` exists and has permissions to connect from `%`:

SELECT user, host FROM mysql.user WHERE user = 'user';
SHOW GRANTS FOR 'user'@'%';

You should see an entry for `user` with the host as `%` and appropriate grants.

#### c) **Fix Permissions (If Needed)**
If permissions are incorrect, re-create the user and grant privileges:

DROP USER IF EXISTS 'user'@'%';
CREATE USER 'user'@'%' IDENTIFIED BY 'userpassword';
GRANT ALL PRIVILEGES ON site_db.* TO 'user'@'%';
FLUSH PRIVILEGES;

—

### 3. **Test the Connection Again**
Return to the PHP container and re-run the connection test:

mysql -h ot7mysql2 -P 3306 -u user -p

—

### 4. **Inspect the Network**
Ensure the containers are on the same network and can communicate:

#### a) **List Networks**
Run:

docker network inspect other-7app-network

Ensure both `other-7php` and `other-72mysql` are listed as connected containers.

#### b) **Ping MySQL From PHP**
From the PHP container:

ping ot7mysql2

If this fails, there’s a network issue preventing communication.

—

### 5. **Check MySQL Logs**
Inspect the MySQL logs for any errors that might provide a clue:

docker logs other-72mysql

Look for errors like failed authentication attempts or other misconfigurations.

—

### 6. **Rebuild and Restart Containers**
After making changes, rebuild and restart the containers to ensure all updates are applied:

docker-compose down
docker-compose up --build -d

—

### 7. **Double-Check `wp-config.php`**
Ensure the database credentials in `wp-config.php` match the following:

define('DB_NAME', 'site_db');
define('DB_USER', 'user');
define('DB_PASSWORD', 'userpassword');
define('DB_HOST', 'ot7mysql2');

—

### Next Steps
If the issue persists, please share:
1. The results of the MySQL connection test from the PHP container.
2. Any errors from the MySQL logs (`docker logs other-72mysql`).
3. The output of `docker network inspect other-7app-network`.

—

### 1. **Ensure the Services are on the Same Docker Network**
Check if both `other-7php` and `other-72mysql` are connected to the same network (`other-7app-network`).

#### a) **Inspect the Network**
Run:

docker network inspect other-7app-network

– Look for both `other-7php` and `other-72mysql` in the list of connected containers.
– If one of them is missing, it means they are not correctly attached to the network.

#### b) **Reconnect Containers to the Network**
If either container is not on the network, reconnect them:

docker network connect other-7app-network other-7php
docker network connect other-7app-network other-72mysql

—

### 2. **Rebuild Containers**
If the issue persists, rebuild the containers to ensure the network configuration is applied:

docker-compose down
docker-compose up --build -d

—

### 3. **Verify Hostname Resolution**
Access the PHP container and attempt to resolve the `ot7mysql2` hostname:

docker exec -it other-7php bash
apt update && apt install -y dnsutils
nslookup ot7mysql2

– If this fails, Docker's internal DNS system is not resolving the hostname. This could be due to misconfiguration in the `docker-compose.yml` file.

—

### 4. **Double-Check the Docker Compose File**
Ensure the `php` and `ot7mysql2` services are correctly listed under the same network:

networks:
  other-7app-network:
    driver: bridge

Both services (`php` and `ot7mysql2`) should have:

networks:
  - other-7app-network

—

### 5. **Use Container Name as Hostname**
If Docker DNS resolution still fails, try using the MySQL container name (`other-72mysql`) instead of the service name (`ot7mysql2`) in your `wp-config.php` file:

define('DB_HOST', 'other-72mysql');

—

### 6. **Restart the Network**
If nothing works, recreate the Docker network and restart everything:

#### a) **Remove the Existing Network**

docker network rm other-7app-network

#### b) **Restart Containers**

docker-compose down
docker-compose up --build -d

This will recreate the network and reattach all containers.

—

### 7. **Test the Connection Again**
After making these changes, try connecting to MySQL from the PHP container again:

docker exec -it other-7php bash
mysql -h ot7mysql2 -u user -p

—

### Let Me Know the Results
If you still encounter issues, share:
1. The output of `docker network inspect other-7app-network`.
2. The results of `nslookup ot7mysql2` from the PHP container.

### Step-by-Step Fix

—

### 1. **Recreate the Docker Network**

First, let's recreate the `other-7app-network` that was removed:

docker network create other-7app-network

—

### 2. **Ensure the Network Is Defined in `docker-compose.yml`**

Check that your `docker-compose.yml` file correctly references the network. The `networks` section should look like this:

networks:
  other-7app-network:
    driver: bridge

And under each service (such as `php`, `nginx`, `ot7mysql2`), ensure that they are connected to the network:

services:
  nginx:
    ...
    networks:
      - other-7app-network

  php:
    ...
    networks:
      - other-7app-network

  ot7mysql2:
    ...
    networks:
      - other-7app-network

—

### 3. **Rebuild and Restart the Containers**

Once the network is created and your `docker-compose.yml` file is correctly configured, rebuild and restart the containers:

docker-compose down
docker-compose up --build -d

This will recreate the containers and connect them to the newly created network.

—

### 4. **Verify Network Connection**

After the containers are up and running, check if both `php` and `ot7mysql2` are connected to the `other-7app-network`:

docker network inspect other-7app-network

Make sure both containers are listed in the "Containers" section.

—

### 5. **Test the Connection Again**

Now, try to connect to MySQL from the `php` container again:

docker exec -it other-7php bash
mysql -h ot7mysql2 -u user -p

—

### 6. **Test DNS Resolution (If Needed)**

If MySQL still doesn't connect, test DNS resolution from the `php` container:

docker exec -it other-7php bash
apt update && apt install -y dnsutils
nslookup ot7mysql2

If `nslookup` resolves the hostname correctly, your network setup is working. If it doesn't, it might indicate a deeper issue with the Docker networking configuration.

—

Let me know the results or if any errors persist.

services:
nginx:
image: nginx:latest
container_name: other7-nginx
ports:
– "5500:80"
networks:
– other-7app-network
volumes:
– ./nginx:/etc/nginx/conf.d
– ./applications/dndw-test:/var/www/dndw-test
depends_on:
– php

php:
build:
context: ./php
container_name: other-7php
volumes:
– ./applications/dndw-test:/var/www/dndw-test
expose:
– "9000"
working_dir: /var/www
networks:
– other-7app-network

ot7mysql2:
image: mysql:8.0
container_name: other-72mysql
environment:
MYSQL_ROOT_PASSWORD: rootpassword
MYSQL_DATABASE: site_db
MYSQL_USER: user
MYSQL_PASSWORD: userpassword
volumes:
– ./mysql/data:/var/lib/mysql
ports:
– "3308:3306"
networks:
– other-7app-network

adminer:
image: adminer
container_name: other-7adminer
restart: always
ports:
– '5501:8080'
networks:
– other-7app-network
depends_on:
– ot7mysql2

networks:
other-7app-network:
driver: bridge

delete all and rebuild again

### 1. **Stop and Remove Containers**
Run the following to stop and remove all the containers:

docker-compose down

This will stop all running containers and remove them. It also removes the default network that Docker Compose creates for the services.

—

### 2. **Remove Volumes (Optional)**
If you want to remove the associated volumes (such as database data), which might be helpful if you want to reset the database, run:

docker-compose down -v

This will remove the volumes along with the containers.

—

### 3. **Rebuild the Containers**
Now, rebuild and restart the containers:

docker-compose up --build -d

This will:

– Rebuild the containers based on the latest configurations in your `docker-compose.yml`.
– Restart them in detached mode.

—

### 4. **Verify the Containers Are Running**
After the containers are up, check that all services are running:

docker ps

Ensure that `other-7nginx`, `other-7php`, `other-72mysql`, and `other-7adminer` are listed.

—

### 5. **Check Network Configuration**
Ensure that the containers are connected to the correct network (`other-7app-network`):

docker network inspect other-7app-network

You should see the containers listed under the "Containers" section.

—

### 6. **Test MySQL Connection Again**
If everything is up and running, test the MySQL connection from the PHP container:

docker exec -it other-7php bash
mysql -h ot7mysql2 -u user -p

If you still encounter issues, verify the `wp-config.php` file for correct database credentials:

define('DB_NAME', 'site_db');
define('DB_USER', 'user');
define('DB_PASSWORD', 'userpassword');
define('DB_HOST', 'ot7mysql2');

Let me know if the issue persists or if you encounter any errors during the rebuild!

### 1. **Remove Volumes (Optional but Recommended)**
If you want to ensure that all volumes are removed (including database volumes), run the following:

docker-compose down -v

This will remove any persistent data, including MySQL data stored in volumes.

—

### 2. **Recreate the Network**
To ensure everything is set up correctly, let's recreate the network manually:

docker network create other-7app-network

—

### 3. **Rebuild and Start the Containers**
Now, rebuild and start the containers again:

docker-compose up --build -d

This will rebuild the containers based on the `docker-compose.yml` configuration and start them in detached mode.

—

### 4. **Verify the Containers Are Running**
Once the containers are up, check the status:

docker ps

You should see the containers for `nginx`, `php`, `mysql`, and `adminer` running.

—

### 5. **Inspect the Network Again**
Ensure all services are connected to the correct network:

docker network inspect other-7app-network

Check that the containers `other-7php` and `other-72mysql` are in the "Containers" section.

—

### 6. **Test the MySQL Connection**
If everything is up, try testing the MySQL connection again:

docker exec -it other-7php bash
mysql -h ot7mysql2 -u user -p

If everything works, you should be able to log in to MySQL from the PHP container.

—

Let me know if you face any issues or errors during the process!

### 1. **Stop and Remove All Containers**
Run the following command to stop and remove all containers created by Docker Compose:

docker-compose down

This will stop the containers and remove them.

### 2. **Remove Volumes (Optional but Recommended)**
If you want to also remove all associated volumes (such as the MySQL data), run:

docker-compose down -v

This will remove the containers **and** the volumes.

### 3. **Remove All Containers (Optional)**
If you want to remove **all** containers on your system (not just the ones for your project), use:

docker container prune

This will remove all stopped containers.

You will be prompted for confirmation. Type `y` to proceed.

### 4. **Remove All Images (Optional)**
If you want to remove all Docker images (warning: this will delete all images from your system, not just project-specific ones):

docker rmi $(docker images -q)

This will delete all images stored locally.

### 5. **Remove Networks**
If you want to delete any custom Docker networks that are no longer needed, run:

docker network prune

This will remove all unused networks. You can also manually remove a specific network by using:

docker network rm <network_name>

—

After completing these steps, all containers, volumes, and networks related to your Docker setup will be deleted. You can now rebuild and restart everything from scratch using `docker-compose up`.

Let me know if you need any further assistance!

### 1. **Stop All Running Containers**
First, stop all running containers:

docker stop $(docker ps -q)

This will stop all containers that are currently running.

### 2. **Remove All Containers**
Once the containers are stopped, you can remove them with:

docker rm $(docker ps -a -q)

This will remove all containers, whether they are running or stopped.

### 3. **Verify Containers Are Removed**
You can confirm that all containers have been removed by running:

docker ps -a

This should return no containers.

—

These steps will remove **all** containers on your system. If you want to remove specific containers, just use their container IDs or names in place of `$(docker ps -a -q)`.

Let me know if you need any further help!

### 1. **Stop All Running Containers**
First, stop all running containers:

docker stop $(docker ps -q)

### 2. **Remove All Containers**
Next, remove all containers (including stopped ones):

docker rm $(docker ps -a -q)

### 3. **Remove All Images**
Finally, remove all Docker images:

docker rmi $(docker images -q)

This will delete all images on your system. If some images are being used by existing containers, Docker may prevent them from being deleted. In that case, ensure the containers are removed first.

### 4. **Verify Deletion**
You can verify that everything has been deleted:

– **No running containers:**

docker ps

– **No containers (including stopped ones):**

docker ps -a

– **No images:**

docker images

—

### Important Notes:
– These commands will **delete everything** related to Docker: all containers, images, and volumes.
– If you have important data or images, be sure to back them up before running these commands.

Let me know if you need more help!