Problem essence
Writing the API server in NodeJS (Express) using the PostgreSQL database (connecting to it remotely through the service ElephantSQL and work through Sequelize). Today appeared an error "SequelizeHostNotFoundError". It occurs even in the checked endpoints.
Error text
(it remains only a screenshot of the error)
My attempts to solve the problem
Tried to perform a GET request to my API not via Postman and via the browser (did not help).
Tried to create a new DB on the same service ElephantSQL (didn't help, but migrations to create new tables and relationships somehow executed and endpoints still not working).
Tried to connect to the database directly via IDE DataGrip (connection test is successful and the database is loaded with all the tables).
What could be the problem ? On stackoverflow some wrote that the problem may occur due to the lack of a paid subscription to Google Cloude Functions, but I do not seem to use it. There is an option to connect to PostgreSQL locally, but I want to understand.
Related
So I have an Node API hosted on AWS' Beanstalk and it's connected to a DocumentDB database hosted within the same VPC, unfortunately I can't share too much info on the project since I've inherited it, but currently we have a terrible logic of creating a new db for each tenant in the system so when they sign in we create a new mongoose connection (with the proper string). Upon that there is also a global connection to a central db which is supposed to be established upon the initial start of the API - this works as expected. What doesn't work for some reason is that whenever I make a request that's supposed to go through for a certain tenant I get the following error on AWS Beanstalk logs:
ERROR IMAGE
Unfortunately, I can't fully disclose the connection strings, but I can tell you that there are no references to "locahost" within the project (noted in the picture):
PROJECT SEARCH RESULT
Has anyone encountered similar issues ?
We have multiple APIs running on AWS instance on different ports. One of the API is giving error "No valid replicaset instance servers found". Other APIs is working fine. No messages in mongodb log. Tried all other options mentioned in stackoverflow such as increasing timeout etc. However did not help.
Same API works properly when run on local server. Restarted AWS instance and it started working fine.
Not able to replicate the issue. Any direction to check the root cause. Would like to avoid happening again. Would appreciate any areas to investigate further to find root cause.
I'm deploying a node app to an ec2 instance through aws elastic beanstalk. I set up a cron job with the cron node package that, on tick, will run a sequelize query, parse the data returned, then send it in the body of an email.
When testing locally, it works fine and the email gets sent. When i deploy it using awsebcli command eb deploy, it says the deploy was successful, but I don't receive any emails.
At first I believed the npm start command wasn't working on the server, but I checked the error logs and it appears sequelize is throwing a time out error when trying to connect.
I wrote a configuration for sequelize to connect to multiple schemas at once. Three of those schemas are hosted on the same RDS, one on a seperate RDS.
I've done almost the exact same thing with another node app and it worked fine. The only thing different is the additional schema on a seperate RDS that I'm connecting to fine on my local machine.
Any thoughts or suggestions would be appreciated.
EDIT: Checked server logs and found Sequelize connection error.
Found that the issue was caused by security groups on aws preventing my instance from connecting to one of the DBs it needed.
Edit:
Specifics have been requested. Since this is a very old post and I don't have access to AWS anymore, I can venture a guess on what I did.
If my memory serves correct, the db I was blocked by was hosted in a different aws account. Changing the security group on the DB was not an option as security on that account was firmly maintained. The reason I was able to connect locally was because the facility I was working at had a whitelisted IP on the DB security groups. I eventually settled on running the script on my local machine, since my machine rarely left that location and it did not matter where the script was run, just that it ran periodically. Ideally though, I would have been able to change the security group on the db to allow incoming traffic from my server.
So I have a Azure website. It uses "code-first" entity framework for its database. It works like a champ.
I have a new console application turned webjob that I am connecting to this website and it is supposed to use the same database.
Now everything I have read points me to the direction that the webjob should share the configuration settings of the website which leads me to believe that it should be able to access the database through this sharing of info.
However...when the schedule runs I get the classic
"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections."
error that signifies that my connection string is missing or incorrect.
In my console application for the webjob I have specifically not put in a connection string because, again, I thought they were linked somehow.
My question is simply, what am I misunderstanding here, and/or is there something else I need to do in my console application to get the web job to connect correctly?
UPDATE
So I added a traditional connection string into the app and that seems to work just fine. I suppose this is fine, but I was really hoping that I wouldn't have to change my config each time I change environments...thought we were finally passed that.
Thanks!
David
you can use the ConfigurationManager to grab your connection string...
e.g., ConfigurationManager.ConnectionStrings["YOUR_CONNECTION_STRING_NAME"]
I know this is kind of trivial, but I have been searching on google for a solution to this problem, this here is my first time deploying a mongodb+node.js application, I have succeeded in hosting a node.js application with static data, I have changed it to use a database -mongodb, I have created a mongodb database on mongolab.com,
I have tried connecting but I keep getting this error
Database error
Error details: Error: failed to connect to [subdomain.mongolab.com:10027]
I have been searching over google, did not get a solution, have also contacted the site admin, my database connection and the entire code to fetch from mongodb remotely is
here on github , thanks