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Use the AskDBA MySQL MCP server for the walkthrough below. It accepts a MYSQL_DSN connection string and can run either as a Docker process launched by a local MCP client or as a service in Docker Compose. “MySQL MCP server” is a category, not a single standard image: other projects use different images, environment variables, transports, and security controls.
This guide covers a same-Compose MySQL database, MySQL on the Docker host, and a remote database; shows stdio and HTTP deployment choices; and explains how to connect an MCP client without exposing an unauthenticated database bridge.
What you need before starting
- Docker Engine with the Compose plugin if you will run both services together.
- A MySQL instance and a database account created specifically for MCP access.
- An MCP client that supports either a local stdio process or the HTTP transport offered by your selected implementation.
- The current AskDBA image name and release documentation. Repository branches and image tags can change, so verify the tag before production use rather than assuming a floating
latesttag is permanent.
The commands here follow the AskDBA README’s interface: a MYSQL_DSN value such as mysql://user:password@mysql:3306/appdb. Do not mix these variables with the MYSQL_MCP_* settings used by the separate Futuretea project.
Choose your Docker networking topology
MySQL and MCP in one Compose project
Compose creates a private network and DNS entry for each service. If the database service is named mysql, the MCP container must use mysql as the hostname—not localhost. Inside a container, localhost means that same container.
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MySQL running on the Docker host
Use a host address resolvable from inside the container. The project examples use host.docker.internal. Docker Desktop supplies this name on common desktop platforms; Linux installations may require an explicit host-gateway mapping. Confirm the behavior for your Docker version and distribution before relying on it.
MySQL on another machine
Put the database’s routable DNS name or IP address in the DSN, open only the required network path, and configure MySQL to accept connections from the Docker host or network. A container cannot reach a remote database unless routing, firewall rules, MySQL bind settings, and credentials all permit it.
Option 1: run the prebuilt image with stdio
Stdio is the simplest choice when a local MCP client launches Docker as a child process. The client keeps standard input and output attached to the container, while Docker removes the container after the client exits.
- Create a dedicated MySQL account with only the permissions your tools need. A read-only account is safer for inspection tasks; grant writes only when they are genuinely required.
- Replace the image reference below with the current AskDBA image and verified release tag from its documentation.
- Configure your MCP client to execute Docker with interactive input:
docker run -i --rm
-e MYSQL_DSN='mysql://mcp_user:[email protected]:3306/appdb'
ASKDBA_IMAGE:VERIFIED_TAGDo not publish a port for this mode. The client communicates through stdio, so there is no network listener to protect. Keep the password out of shell history where possible: use an environment file with suitable permissions or your client’s secret-management facility.
Option 2: run MySQL and the MCP server with Docker Compose
This pattern is useful for a disposable development database or a self-contained stack. The database service is called mysql, and the DSN uses that service name.
services:
mysql:
image: mysql:8.0
environment:
MYSQL_DATABASE: appdb
MYSQL_USER: mcp_user
MYSQL_PASSWORD: change-this-in-a-secret-store
MYSQL_ROOT_PASSWORD: change-root-password
volumes:
- mysql_data:/var/lib/mysql
healthcheck:
test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-pchange-root-password"]
interval: 10s
timeout: 5s
retries: 10
mysql-mcp:
image: ASKDBA_IMAGE:VERIFIED_TAG
environment:
MYSQL_DSN: mysql://mcp_user:change-this-in-a-secret-store@mysql:3306/appdb
depends_on:
- mysql
volumes:
mysql_data:Save this as compose.yml, replace the image and secrets, then start it with:
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docker compose up -d
docker compose logs -f mysql-mcpdepends_on controls startup order but does not guarantee that MySQL is ready to accept queries. If the MCP process exits during initial startup, inspect the logs and restart it after MySQL becomes ready, or add a readiness-aware health dependency supported by your Compose version and image.
Use an existing MySQL container instead
If MySQL is already in another Compose project, the two projects must share a Docker network or the database must be reachable through a routable address. The hostname is the database container’s network alias or service name on that shared network; it is not automatically localhost.
Connecting to MySQL on the host
Adapt the same AskDBA command by changing only the DSN host:
docker run -i --rm
--add-host=host.docker.internal:host-gateway
-e MYSQL_DSN='mysql://mcp_user:[email protected]:3306/appdb'
ASKDBA_IMAGE:VERIFIED_TAGThe --add-host mapping is particularly relevant on Linux, where the special hostname may not be configured automatically. Your MySQL server must listen on an address reachable from Docker, and its firewall and account host restrictions must allow the connection. Leaving MySQL bound only to the host loopback interface commonly causes “connection refused” or timeout errors.
Transport choice: stdio, HTTP, or SSE
Stdio
Choose stdio for a local desktop client that starts the server itself. It avoids an exposed TCP port and keeps the trust boundary on one machine. The client configuration must invoke Docker with -i; omitting interactive input can prevent the MCP handshake.
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Network transports are useful when the MCP client is on another machine or when one server should serve multiple clients. Transport support and command-line flags are implementation-specific. Do not assume that an AskDBA stdio command accepts the HTTP flags from another repository.
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The Futuretea implementation documents a different image and variable schema, including MYSQL_MCP_HOST, MYSQL_MCP_DB_PORT, MYSQL_MCP_USERNAME, MYSQL_MCP_PASSWORD, and MYSQL_MCP_DATABASE. Its HTTP example publishes port 8080 and starts with --port 8080 --listen 0.0.0.0; documented paths include /healthz, /mcp, /sse, and /message. Those commands belong to Futuretea, not AskDBA.
Futuretea’s documentation explicitly warns that its HTTP and SSE modes provide no built-in authentication or TLS. Keep such a service on a trusted network or place it behind a correctly configured reverse proxy that supplies authentication, TLS, request limits, and logging. Other implementations may provide different controls; verify their current documentation instead of transferring this warning or assuming protection that is not stated.
Configure database permissions and secrets
- Create a separate account for the MCP workload instead of using MySQL root.
- Grant the minimum database, table, or routine privileges needed by the tools.
- Use a secret file, Docker secret, environment manager, or client vault rather than committing passwords to Git.
- Rotate credentials and remove unused accounts.
- Remember that database privileges are not the same as MCP tool restrictions. Do not describe a server as read-only unless its current implementation documentation guarantees that behavior.
Test the account independently with the MySQL client before debugging MCP. This separates DNS, routing, TLS, and permissions failures from protocol or client-configuration failures.
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Connect your MCP client and verify the setup
Local client using stdio
- Add a server entry using the exact Docker command for the AskDBA image, including
-i,--rm, andMYSQL_DSN. - Restart or reload the client so it launches the process.
- Ask the client to enumerate available tools, then run a harmless metadata query such as listing databases or tables permitted to the account.
- Check container output only for operational diagnostics; never paste passwords into support logs.
Remote HTTP client
Use the URL and transport path documented by the implementation you selected, and restrict ingress to the MCP client’s network. For Futuretea’s documented example, the health check is:
curl http://localhost:8080/healthzRun that check from the machine that can actually reach the container. A successful health response proves the service endpoint answered; it does not prove that MySQL credentials, permissions, or every MCP tool work.
Troubleshooting
“Unknown host mysql”
The MCP container is not on the Compose network containing the mysql service, or the service has a different name. Put both services in the same project/network and use the actual service name in MYSQL_DSN.
“Connection refused” or timeout
Check that MySQL is running and listening on the expected port, that the container can resolve and route to the host, and that firewalls permit traffic. For host MySQL, try host.docker.internal and, on Linux, the host-gateway mapping. For a remote server, verify DNS and security-group rules.
Authentication or access denied
Confirm the username, password, database name, and allowed client host in MySQL. Test the same credentials with a direct MySQL client from a network location equivalent to the MCP container.
The MCP client shows no tools
For stdio, make sure Docker is invoked with interactive input and that the image process is not writing non-protocol text to stdout. Inspect container logs and the client’s server status. For HTTP, confirm that you selected the implementation’s documented path and transport rather than copying flags from another project.
The server starts before MySQL
Compose startup order is not readiness. Review logs, wait for MySQL initialization to finish, then restart the MCP service. A persistent volume can also contain an old database configuration; verify the effective environment and data directory.
HTTP works locally but not remotely
Check published-port binding, container-network policy, host firewall rules, reverse-proxy routing, and TLS configuration. Do not solve this by exposing an unauthenticated endpoint to the public internet.
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- Keep the MCP container close to MySQL to reduce network latency and avoid sending database traffic over unnecessary hops.
- Use connection limits and query timeouts appropriate to your workload; an AI client can issue unexpected sequences of exploratory queries.
- Pin a verified image release for reproducibility and update it deliberately. Floating tags can change without a configuration-file edit.
- Back up MySQL independently of the MCP container. The MCP image is an interface, not a database backup system.
- Monitor container restarts, MySQL errors, connection saturation, and proxy access logs.
- Start with a least-privilege account and a private network; add write access or broader network reach only after a specific requirement is documented.
How the main implementations differ
| Implementation | Configuration style | Transport/deployment notes | Security point |
|---|---|---|---|
| AskDBA | MYSQL_DSN connection string |
Prebuilt Docker image; README shows stdio and Compose with a MySQL service named mysql |
Apply the controls of your chosen transport and network; verify current release documentation |
| Futuretea | Separate MYSQL_MCP_* variables |
Documents stdio, Streamable HTTP, and SSE; HTTP example uses port 8080 and paths including /healthz |
Documentation says HTTP/SSE have no built-in auth or TLS; use trusted networks or a reverse proxy |
| Neverinfamous | Project-specific CLI and image options | Offers explicit transport and host/container/remote networking examples | Inspect its current interface and security documentation before deployment |
These are selection dimensions, not a benchmark. Choose the implementation whose transport, configuration interface, release process, and security model match your client and network.
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Can I use localhost in the MCP container’s MySQL DSN?
Only when MySQL runs inside that same container. For a sibling Compose service use its service name, such as mysql; for the Docker host use a container-reachable host address.
Should I expose the MCP server on port 8080?
Only when your selected implementation documents an HTTP transport and your client needs network access. Keep stdio local when possible, and protect any HTTP endpoint with network controls and, where needed, a reverse proxy.
Is every MySQL MCP server read-only?
No. Permissions and tool behavior vary by implementation. Enforce the required limits in MySQL and verify the selected project’s documentation.
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