App Platform service connecting to Manage MySQL receives 'self signed certificate in certificate chain' error

I have two projects, one containing a database and the other containing an app via the App Platform.

I’m trying to connect to my database via my deployed app but I receive a self signed certificate in certificate chain error on connection attempts. The credentials themselves work via a GUI and the app itself is marked as a trusted source. This has been done via manually inputting the CA Cert as an env variable.

I’ve also tried creating a component specific env variable from this guide in the App Platform’s config but it can’t find my database service.

My connection code looks like the below. I’m aware I can set rejectUnauthorized: false against my connection, but I don’t want to have to do this. How can I get my App Platform component to successfully connect to my Database?

const mysql = require("mysql2/promise");
let pool;
pool = mysql.createPool({
    host: MYSQL_HOST,
    password: MYSQL_PASSWORD,
    database: MYSQL_DATABASE,
    port: MYSQL_PORT,
    waitForConnections: true,
    connectionLimit: 10,
    maxIdle: 10,
    idleTimeout: 60000,
    queueLimit: 0,
    enableKeepAlive: true,
    keepAliveInitialDelay: 0,
    supportBigNumbers: true,
    timezone: "Z",
    ssl: {
        ca: process.env.MYSQL_CA_CERT,

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Bobby Iliev
Site Moderator
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June 13, 2024


Does this error occur during the build process or the actual run process? Database values are not available during build time but are available at runtime.

Also, if you were to try and console log the process.env.MYSQL_CA_CERT value, do you see the correct certificate?

As per the official docs, the mysql2/promis requires a file path rather than passing the certificate directly:

What you could do is to add a command to the app that creates the certificate file upon runtime, such as echo $MYSQL_CA_CERT > ca_cert.cert && <original run command>. App Platform requires the original run time command to start the app upon runtime.

Then you can reference that file in the connection string, eg:

ca: fs.readFileSync('./ca_cert.cert'),

Let me know how it goes!

- Bobby

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