Error occured with redis HMSEET, dial tcp :6379: connect: connection refused - docker

Question

I have a dockerized back-end with golang gin server, postgresql and redis.
Everything starts correctly with this docker-compose.yaml file :
version: '3.9'
services:
postgresql:
image: 'postgres:13.1-alpine'
volumes:
- data:/var/lib/postgresql/data
env_file:
- ./env/postgre.env
healthcheck:
test: ["CMD-SHELL", "pg_isready -U postgres"]
interval: 10s
timeout: 5s
retries: 5
ports:
- '5432:5432'
server:
build: ./server
ports:
- '8000:8000'
volumes:
- ./server:/app
depends_on:
- postgresql
redis:
image: "redis"
ports:
- "6379:6379"
volumes:
- $PWD/redis-data:/var/lib/redis
volumes:
data:
Than I initialize redis in main func :
func main() {
util.InitializeRedis()
(...)
// InitializeRedis func
func newPool() *redis.Pool {
return &redis.Pool{
MaxIdle:3,
IdleTimeout:240 * time.Second,
DialContext: func(context.Context) (redis.Conn, error) {
return redis.Dial("tcp",":6379")
},
}
}
var (
pool *redis.Pool
)
func InitializeRedis() {
flag.Parse()
pool = newPool()
}
It doesn't prompt any error, but I cannot get connection with pool.Get in another function :
// Handle "/redis" for test
router.GET("/redis", util.ServeHome)
// ServeHome func
func ServeHome(ctx *gin.Context){
conn := pool.Get()
defer conn.Close()
var p1 struct{
Title string `redis:"title" json:"title"`
Author string `redis:"author" json:"author"`
Body string `redis:"body" json:"body"`
}
p1.Title = "Example"
p1.Author = "Gary"
p1.Body = "Hello"
if _, err := conn.Do("HMSET", redis.Args{}.Add("id1").AddFlat(&p1)...); err != nil {
log.Fatalf("Error occured with redis HMSEET, %v", err) // Error in console is from here
return
}
(...)
And when I try to access /redis with Insomnia it shows: Error: Server returned nothing (no headers, no data) and in console logs : Error occured with redis HMSEET, dial tcp :6379: connect: connection refused
I couldn't find any article which solve this problem for me, so I do appreciate any help.

Answer 1

Since you're using docker-compose Redis won't be available on :6379, instead it will be available on the hostname redis.
I think you'll need to update your code to the following:
redis.Dial("tcp","redis:6379")