a year ago
Hi,
I'm having problems to connect a my golang service with a redis db, using the "github.com/redis/go-redis/v9" package.
I always obtain this error:
1.- If I use the redilslabs db: unable to connect to redis: dial tcp: lookup redis-11333.c77.eu-west-1-1.ec2.cloud.redislabs.com: i/o timeout
2.- If I use the selfhosted, railway private url: panic: unable to connect to redis: dial tcp: lookup redis.railway.internal: i/o timeout
I tried these combinations:
Use alpine:latest, ubuntu:latest and golang:1.22 (this last is the same image that i use for local development, and I'm able to connect with the redislabs redis database)
I print some logs to be sure that env variables are correct, double check they.
Service is able to connect and ping a mongo db hosted in atlas.
I wait 5 seconds prior to try ping the redis db.
The chunk of code that manages the redis connection is:
func MustNewConnectedRedis(ctx context.Context, connectionString string) *Redis {
r := NewRedis(ctx)
err := r.Connect(connectionString)
if err != nil {
panic(fmt.Sprintf("unable to connect to redis: %s", err.Error()))
}
return r
}
func NewRedis(ctx context.Context) *Redis {
return &Redis{
ctx: context.Background(),
}
}
func (r *Redis) Ping() error {
return r.client.Ping(r.ctx).Err()
}
func (r *Redis) Connect(connectionString string) error {
if r.client != nil {
return ErrRedisAlreadyConnect
}
opt, err := redis.ParseURL(connectionString)
if err != nil {
return err
}
fmt.Printf("redis options: %+v\n", opt)
r.client = redis.NewClient(opt)
return r.Ping()
}What are I doing wrong? The printed redis options looks ok, and looks like the printed redis options in my local env, that is able to connect to redislabs with same redis url.
Thanks!!!
ⓘ Deployment information is only viewable by project members and Railway employees.
12 Replies
a year ago
golang:1.22:
Dockerfile is so simple:
FROM golang:1.22
WORKDIR /root/
COPY ./app .
CMD ["./app"]I also tried ubuntu:latest and alpine:latest
a year ago
If it helps in the diagnosis, service has no domain generated in the Networking->Public Networking tab, because I have another services running caddy as a reverse proxy, so all my services can be accessed via api.example.com/service/endpoint...
a year ago
First, can you please write a proper Dockerfile? one that copies in your project, installs the deps and builds the binary.
a year ago
Yes, I can, bu why? I already have the binary compiled and tested in my pipelines, so I want to reuse it. Is this impossible?
a year ago
It's just not typically done, personally I would go as far as to say its bad practice.
Either way, please look at this docs section -
https://docs.railway.app/guides/private-networking#initialization-time
a year ago
ok, you are the expert. Now I have this```Dockerfile
From golang:1.22 as builder
ARG GITHUB_PAT
ARG GOPRIVATE
WORKDIR /src/app
RUN git config --global url."https://${GITHUB_PAT}:x-oauth-basic@github.com/kubik-app".insteadOf "https://github.com/kubik-app"
COPY go.* .
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -o server
FROM ubuntu:latest as prod
WORKDIR /root/
COPY --from=builder /src/app ./app
CMD ["./app/server"]```
I also try with alpine:latest and golang:1.22 as the prod stage. Connection error is the same, from logs:
panic: unable to connect to redis: dial tcp: lookup redis-15298.c77.eu-west-1-1.ec2.cloud.redislabs.com: i/o timeoutI also try with this simple dockerfile:
From golang:1.22 as builder
ARG GITHUB_PAT
ARG GOPRIVATE
WORKDIR /src/app
RUN git config --global url."https://${GITHUB_PAT}:x-oauth-basic@github.com/kubik-app".insteadOf "https://github.com/kubik-app"
COPY go.* .
RUN go mod download
COPY . .
RUN go build -o server
CMD [ "./server" ]but it has the same result: panic: unable to connect to redis: dial tcp: lookup redis-11333.c77.eu-west-1-1.ec2.cloud.redislabs.com: i/o timeout
a year ago
Please connect to a Railway hosted Redis database via the private network, see the docs page I linked.
a year ago
Do you have Static IPs enabled?
No, I doesn't have Static IPs enabled, i'm trying it
a year ago
Are you able to connect to this locally via redis-cli?
Could you try increasing redis-go's timeouts [0]?
[0] https://github.com/redis/go-redis/blob/master/options.go#L83-L91
a year ago
Hi got it. I was testing all your suggestions.
Static IPs doesn't works
I can connect with redislabs when I execute the same docker container locally, via docker-compose.
I can connect with redislabs via redis-cli, with same credentials:
```bash
redis-cli -u redis://default:**********@redis-11333.c77.eu-west-1-1.ec2.cloud.redislabs.com:11333
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
redis-11333.c77.eu-west-1-1.ec2.cloud.redislabs.com:11333> PING
PONG
redis-11333.c77.eu-west-1-1.ec2.cloud.redislabs.com:11333> This works, with no Static IPs:[0] https://github.com/redis/go-redis/blob/master/options.go#L83-L91
func (r *Redis) Connect(connectionString string) error {
if r.client != nil {
return ErrRedisAlreadyConnect
}
opt, err := redis.ParseURL(connectionString)
if err != nil {
return err
}
opt.DialTimeout = 30 * time.Second
opt.ReadTimeout = 30 * time.Second
opt.MaxRetries = 10
opt.MaxRetryBackoff = 1 * time.Second
fmt.Printf("redis options: %+v\n", opt)
r.client = redis.NewClient(opt)
return r.Ping()
}This does not work
CMD sleep 5 && /root/appI just change the redislabs urls and password just for security :)
I hate that press shift + enter add a new line in this editor, but the server trim this new line XDXDXD
Thanks a lot @rc and @brody