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Cannot connect to AWS RDS PostgreSQL with Golang using Helm Charts

12/13/2018

I am unable to connect to AWS RDS PostgeSQL when running Helm Chart for a Go App (GORM). All credentials are stored in a kubernetes secret, and the secret is being used in the helm chart.

Few Points:

Able to connect locally just fine.
The PostgreSQL database is already created in RDS, and made sure that the kubernetes secret as matches with the same creds.
Docker image is pushed and pulled from Gitlab without any errors.
Command "helm ls" displays the deployment status as "DEPLOYED"
When taking "kubectl get pod", I get STATUS as "CrashLoopBackoff"
When taking "kubectl describe pod", I get back MESSAGE "Back-off restarting failed container"
I then take "kubectl logs pod_name" to track the error, and get back the following:
1. failed to connect to the database
2. dial tcp 127.0.0.1:5432: connect: connection refused (Not sure why it is still specifying "127.0.0.1" when i have the secret mounted)
Unable to exec into the pod because it is not running.

I have tried:

Secure a connection in the same cluster from a different pod using psql to ensure that the creds in the secret are in sync with what was set up in RDS PostgreSQL
Changing the api from DB_HOST, to host=%s
Tried connecting using fmt.Sprintf, as well as os.Getenv

"Versions"

GO version:

go1.11.1 darwin/amd64

DOCKER version:

Client: Version: 18.06.1-ce API version: 1.38

API.GO (file)

package controllers

import (
    "fmt"
    "log"
    "net/http"
    "os"
    "time"

    "github.com/gorilla/mux"
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/postgres"
    _ "gitlab.torq.trans.apps.ge.com/503081542/torq-auth-api/models"
)
var err error
type API struct {
    Database *gorm.DB
    Router   *mux.Router
}

func (api *API) Initialize(opts string) {

    // Initialize DB
    dbinfo := os.Getenv("DB_HOST, DB_USER, DB_PASSWORD, DB_NAME, 
DB_PORT sslmode=disable")
    // dbinfo := os.Getenv("host=%s user=%s password=%s dbname=%s port=%s sslmode=disable")
    api.Database, err = gorm.Open("postgres", dbinfo)

    if err != nil {
        log.Print("failed to connect to the database")
        log.Fatal(err)
    }

    // Bind to a port and pass our router in
    // log.Fatal(http.ListenAndServe(":8000", handlers.CORS() . 
  (api.Router)))

    fmt.Println("Connection established")
    log.Printf("Postgres started at %s PORT", config.DB_PORT)
    // MODELS
    type application struct {
        ID        string    `json:"id" gorm:"primary_key"`
        CreatedAt time.Time `json:"-"`
        UpdatedAt time.Time `json:"-"`
        Name      string    `json:"name"`
        Ci        string    `json:"ci"`
    }
    type Cloud struct {
        ID   string `json:"id" gorm:"primary_key"`
        Name string `json:"name"`
    }
    fmt.Println("Tables are created")
    // Enable this line for DB logging
    api.Database.LogMode(true)}

// Initialize Router
    api.Router = mux.NewRouter()
    api.Router.HandleFunc("/api/v1/applications", 
api.HandleApplications)
    api.Router.HandleFunc("/api/v1/application/{id}", 
api.HandleApplication)
    api.Router.HandleFunc("/api/v1/clusters", api.handleClusters)
}

I am not exactly sure where the issue could be here, this is a learning experience for myself. Any ideas would be appreciated.

Thanks in advance!

-- Khaled Aman

go

kubernetes-helm

postgresql

rds

1 Answer

12/13/2018

I think your database initialization code is not doing what you want. Try something like this

var driver = "postgres"
var name = os.Getenv("DB_NAME")
var host = os.Getenv("DB_HOST")
var user = os.Getenv("DB_USER")
var pass = os.Getenv("DB_PASSWORD")
var conn = fmt.Sprintf("host=%v user=%v password=%v dbname=%v sslmode=disable", host, user, pass, name)
api.Database, err := gorm.Open(driver, conn)

-- Mad Wombat

Source: StackOverflow

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Cannot connect to AWS RDS PostgreSQL with Golang using Helm Charts

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