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Connecting MariaDB via SSH Tunnel

In this article, we'll walk you through connecting your MariaDB database to Stitch via an SSH Tunnel.

Connecting MariaDB is a seven-step process:

  1. Retrieve the Stitch public key
  2. Whitelist the Stitch IP addresses
  3. Create a Linux user for Stitch
  4. Create a MariaDB user for Stitch
  5. Enter the connection info into Stitch
  6. Define the Replication Frequency
  7. Select tables and columns to sync

Retrieving the Stitch Public Key

The Public Key is used to authorize the Stitch Linux user. In the next step, we'll create the user and import the key.

To retrieve the key:

  1. On the Stitch dashboard page, click the Add an Integration button.
  2. Click the MariaDB icon.
  3. When the credentials page displays, click the Encryption Type menu and select the SSH Tunnel option.
  4. The Public Key will display, along with the other SSH fields.

Leave this page open throughout the tutorial - you'll need it in the next section and at the end.

Whitelisting the Stitch IP Addresses

For the connection to be successful, you must configure your firewall to allow access from our IP addresses. Whitelist the following IPs before continuing onto the next step:

  • 54.88.76.97/32
  • 52.23.137.21/32
  • 52.204.223.208/32
  • 52.204.228.32/32
  • 52.204.230.227/32

Creating a Linux User for Stitch

Important!
If the sshd_config file associated with the server is not set to the default option, only certain users will have server access - this will prevent a successful connection to Stitch. In these cases, it's necessary to run a command like AllowUsers to allow the Stitch user access to the server.

This can be a production or slave machine, as long as it contains real-time (or frequently updated) data. You may restrict this user any way you like as long as it retains the right to connect to the MariaDB server.

Note that anything inside square brackets - [like this], for example - is something you need to define when running the commands yourself.

To create the new user, run the following commands as root on your Linux server:

adduser [stitch username] -p
mkdir /home/[stitch username]
mkdir /home/[stitch username]/.ssh

To ensure the user has access to the database, we need to import the Public Key from the first step into authorized_keys. Copy the entire key into the authorized_keys file as follows:

touch /home/[stitch username]/.ssh/authorized_keys
"< [PASTE KEY HERE] >" >> /home/[stitch username]/.ssh/authorized_keys

To finish creating the user, alter the permissions on the /home/[stitch_username] directory to allow access via SSH:

chown -R [stitch username]:[stitch username] /home/[stitch username]
chmod -R 700 /home/[stitch username]/.ssh

In the next step, you'll create a database user for Stitch.

Creating a MariaDB User for Stitch

Your organization may require a different process, but the simplest way to create this user is to execute the following query when logged into MariaDB as a user with the right to grant privileges:

GRANT SELECT ON *.* TO '[stitch_username]'@'localhost' IDENTIFIED BY '[secure password here]';

Replace [secure password here] with a secure password, which can be different than the SSH password.

If you wish to restrict this user from accessing data in specific databases, tables, or columns, you can instead run GRANT queries that only allow access to the data you permit.

Entering the Connection Info into Stitch

To wrap things up, we need to enter the connection and user info into Stitch. Did you leave the MariaDB credentials page open? If not, click the Add an Integration button on the dashboard and then click the MariaDB icon. Don't forget to select the SSH Tunnel option from the Encryption Type menu.

  • Integration name: This is the name that will display on the Stitch dashboard for the integration; it’ll also be used to create the schema in your data warehouse.

    For example, the name “MariaDB Marketing” would create a schema called mariadb_marketing in the data warehouse.
  • Host: By default, this will be localhost. In general, it will be the bind-address value for your MariaDB server, which by default is 127.0.0.1 (localhost), but could also be some local network address (e.g. 192.168.0.1) or your server's public IP address.
  • Port: This is MariaDB's port on your server (3306 by default)
  • Username: This is the username of the MariaDB Stitch user
  • Password: This is the password of the MariaDB Stitch user
  • Remote Address: This is the IP address or hostname of the server we will SSH into
  • SSH Port: This is the SSH port on your server (22 by default)
  • SSH User: This is the username of the Linux (SSH) Stitch user

Defining the Replication Frequency

The Replication Frequency controls how often Stitch will attempt to replicate data from your data warehouse. The frequency is set to 30 minutes by default, but you can change it to better suit your needs.

When you're finished, click the Save Integration button to complete the setup.

Selecting Tables & Columns to Sync

Now that your MariaDB database is connected to Stitch, the next step is selecting the tables and fields you want to sync.

If you're missing tables or some have a Sync Status of Unsupported, try these troubleshooting tips.

Related:

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