Railway•12mo ago

Connecting to Private Services Node API <> Redis

My node js sever is having troubling finding the redis/redis-stack-server image in the network. I'm using the traditional 6379 port and the redis-stack-server.railway.internal host name but my node DNS keeps throwing

[ioredis] Unhandled error event: Error: getaddrinfo ENOTFOUND redis-stack-server.railway.internal

at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:107:26)

When I spin up my node server. This works fine on local and together in a docker compose file with the same redis image locally. What am I doing wrong to connect to the redis-stack-server?

Solution:

I went with this set-up and its all working: Dockerfile ```# Start with a node base image FROM node:21...

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36 Replies

Percy•12mo ago

Project ID: N/A

Brody•12mo ago

are you using ioredis?

bigvikingOP•12mo ago

yes

Brody•12mo ago

show me the connection object please

bigvikingOP•12mo ago

const options = {
    host: REDIS_HOST,
    port: REDIS_PORT,
    retryStrategy: (times) => {
        return Math.min(times * 50, 2000);
    },
};

const pubsub = new RedisPubSub({
    publisher: new Redis(options),
    subscriber: new Redis(options),
});

PORT: 6379, HOST: redis-stack-server.railway.internal

Brody•12mo ago

triple backticks btw

bigvikingOP•12mo ago

Brody•12mo ago

you're missing username, password, and, family: 0

bigvikingOP•12mo ago

If I have the UN and PW then the address will resolve? At the moment it seems like it can't pick up the internal addy

Brody•12mo ago

if you have family: 0 the address should resolve, you'd need the username and password regardless

bigvikingOP•12mo ago

interesting, may I ask why 'family' is required? So ...

const options = {
    host: REDIS_HOST,
    port: REDIS_PORT,
    username: REDIS_USER,
    password: REDIS_PASSWORD,
    family: 0, 
    retryStrategy: (times) => {
        // reconnect after
        return Math.min(times * 50, 2000);
    },
};

const options = {
    host: REDIS_HOST,
    port: REDIS_PORT,
    username: REDIS_USER,
    password: REDIS_PASSWORD,
    family: 0, 
    retryStrategy: (times) => {
        // reconnect after
        return Math.min(times * 50, 2000);
    },
};

Brody•12mo ago

the internal network is ipv6 only, ioredis assumes ipv4 by default, family: 0 tells ioredis to use both ipv6 and ipv4 yeah looks good

bigvikingOP•12mo ago

I knew it had something to do with the IPv6 thanks I'll get back to hacking 🚀

Brody•12mo ago

no problem, let me know if it works though this is how i would do it in the variables for your app, reference the redis database's private url like this

REDIS_PRIVATE_URL=${{Redis.REDIS_PRIVATE_URL}}

REDIS_PRIVATE_URL=${{Redis.REDIS_PRIVATE_URL}}

then connect to redis like this

import Redis from "ioredis";

const redisURL = new URL(process.env.REDIS_PRIVATE_URL);

const redis = new Redis({
    family: 0,
    host: redisURL.hostname,
    port: redisURL.port,
    username: redisURL.username,
    password: redisURL.password
});

import Redis from "ioredis";

const redisURL = new URL(process.env.REDIS_PRIVATE_URL);

const redis = new Redis({
    family: 0,
    host: redisURL.hostname,
    port: redisURL.port,
    username: redisURL.username,
    password: redisURL.password
});

bigvikingOP•12mo ago

Hmm.. here's the stack trace. Still throwing the ENOTFOUND with the private address

Brody•12mo ago

you may need to add a 3 second sleep to your start script whats your current start script

bigvikingOP•12mo ago

const main = async () => {
    // Apollo/GraphQL server start.
    await server.start();

    if (server) {
        logger.info(
            `Apollo/GraphQL API is now live on endpoint: ${NODE_PORT}/graphql`
        );
    } else {
        logger.fatal(`Could not start Apollo/GraphQL API`);
        process.exit(1);
    }

    // Middleware for the express application.
    app.use(
        '/graphql',
        cors(),
        helmet(),
        limiter,
        bodyParser.json(),
        expressMiddleware(server, {
            context: async ({ req }) => {
                return { prisma, pubsub, req };
            },
        })
    );

    app.get('/health', (req, res) => {
        res.status(200).send('Okay!');
    });

    // WS server start
    httpServer.listen(NODE_PORT, () => {
        logger.info(
            `Apollo/GraphQL websocket service is live on endpoint: ${NODE_PORT}/graphql`
        );
    });
};

main();

const main = async () => {
    // Apollo/GraphQL server start.
    await server.start();

    if (server) {
        logger.info(
            `Apollo/GraphQL API is now live on endpoint: ${NODE_PORT}/graphql`
        );
    } else {
        logger.fatal(`Could not start Apollo/GraphQL API`);
        process.exit(1);
    }

    // Middleware for the express application.
    app.use(
        '/graphql',
        cors(),
        helmet(),
        limiter,
        bodyParser.json(),
        expressMiddleware(server, {
            context: async ({ req }) => {
                return { prisma, pubsub, req };
            },
        })
    );

    app.get('/health', (req, res) => {
        res.status(200).send('Okay!');
    });

    // WS server start
    httpServer.listen(NODE_PORT, () => {
        logger.info(
            `Apollo/GraphQL websocket service is live on endpoint: ${NODE_PORT}/graphql`
        );
    });
};

main();

is that what you're looking for?

Brody•12mo ago

nope, im looking for your start script, it would be in your package.json

bigvikingOP•12mo ago

oh yeah duh one second "prod": "NODE_ENV=production node app.js",

Brody•12mo ago

how have you told railway to run that script?

bigvikingOP•12mo ago

It runs from a Dockerfile I have in the project

# Start your image with a node base image
FROM node:21

# The /app directory should act as the main application directory
WORKDIR /app

# Copy the app package and package-lock.json file
COPY package*.json ./
COPY package-lock.json package-lock.json

# Copy local directories to the current local directory of our docker image (/app)
COPY . .

# Install node packages. 
RUN npm install 

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "prod"]

# Start your image with a node base image
FROM node:21

# The /app directory should act as the main application directory
WORKDIR /app

# Copy the app package and package-lock.json file
COPY package*.json ./
COPY package-lock.json package-lock.json

# Copy local directories to the current local directory of our docker image (/app)
COPY . .

# Install node packages. 
RUN npm install 

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "prod"]

Brody•12mo ago

do you use this Dockerfile locally too?

bigvikingOP•12mo ago

yes

Brody•12mo ago

okay then in your service settings, set the start command to sleep 3 && npm run prod and just a quick question, why Dockerfile instead of nixpacks?

bigvikingOP•12mo ago

I didn't really know what nixpacks was until I started working on Railway last week

Brody•12mo ago

fair enough mind if i make a suggestion on your dockerfile?

bigvikingOP•12mo ago

Sure thing. I'm relatively new to coding ~2 years.

Brody•12mo ago

nothing major

# Start your image with a node base image
FROM node:21

ENV NPM_CONFIG_UPDATE_NOTIFIER false
ENV NPM_CONFIG_FUND false

# The /app directory should act as the main application directory
WORKDIR /app

# Copy in the package and package-lock.json file
COPY package*.json ./

# Install node packages
RUN npm ci

# Copy local directories to the current local directory of our docker image (/app)
COPY . ./

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "prod"]

# Start your image with a node base image
FROM node:21

ENV NPM_CONFIG_UPDATE_NOTIFIER false
ENV NPM_CONFIG_FUND false

# The /app directory should act as the main application directory
WORKDIR /app

# Copy in the package and package-lock.json file
COPY package*.json ./

# Install node packages
RUN npm ci

# Copy local directories to the current local directory of our docker image (/app)
COPY . ./

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "prod"]

bigvikingOP•12mo ago

neat, I'll have a look at the ci command thanks very much. One question, when you mention my project's service settings what are you referring to

Brody•12mo ago

im referring to the service's settings 😅

bigvikingOP•12mo ago

I see, my fault. I thought you were referring to something related to the node app

Brody•12mo ago

no worries

bigvikingOP•12mo ago

Wanted to follow up and thank you for all the help. The "sleep 3 &&.." custom start command completes the build just fine but I see no deployment logs. The service reports completed but that doesn't seem normal.

Brody•12mo ago

completed means it exited without an error code try setting the start command to

/bin/sh -c "sleep 3 && npm run start"

/bin/sh -c "sleep 3 && npm run start"

Solution

bigviking•12mo ago

I went with this set-up and its all working: Dockerfile

# Start with a node base image
FROM node:21

ENV NPM_CONFIG_UPDATE_NOTIFIER false
ENV NPM_CONFIG_FUND false

# The /app directory should act as the main application directory
WORKDIR /app

# Copy in the package and package-lock.json file
COPY package*.json ./

# Install node packages
RUN npm ci  

# Copy local directories to the current local directory of our docker image (/app)
COPY . .

RUN npx prisma generate

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "railway"]

# Start with a node base image
FROM node:21

ENV NPM_CONFIG_UPDATE_NOTIFIER false
ENV NPM_CONFIG_FUND false

# The /app directory should act as the main application directory
WORKDIR /app

# Copy in the package and package-lock.json file
COPY package*.json ./

# Install node packages
RUN npm ci  

# Copy local directories to the current local directory of our docker image (/app)
COPY . .

RUN npx prisma generate

# Expose the server port
EXPOSE 8080

# Start the container
CMD [ "npm", "run", "railway"]

Start scripts

"railway": "sleep 3 && npm run prod",
"prod": "export NODE_ENV=production && node app.js",

"railway": "sleep 3 && npm run prod",
"prod": "export NODE_ENV=production && node app.js",

Brody•12mo ago

thats a very good way of doing it

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Connecting to Private Services Node API <> Redis