Railway•14mo ago

failed opening connection to sql: default addr for network

Hi, I am trying to deploy my golang web service which connects to mysql. I have added the mysql url reference variable in my web service but currently see this error in my web service logs: failed opening connection to sql: default addr for network

19 Replies

Percy•14mo ago

Project ID: 5b1457c9-94bf-4b38-9366-6949b7e8aa19

jd•14mo ago

project id - 5b1457c9-94bf-4b38-9366-6949b7e8aa19

Brody•14mo ago

can I see a screenshot of your service variables please?

jd•14mo ago

Sure only the one variable at the moment

Brody•14mo ago

looks good to me show me the code that connects to the database please

jd•14mo ago

Brody•14mo ago

still looks good do you happen to be using the private network?

jd•14mo ago

Not that I am aware of . New to railway to be honest. Just created to new services, one the web app and another the mysql service.

Brody•14mo ago

then that's basically a no go into the service settings and disable private networking

jd•14mo ago

Thanks done that and redeployed but still no joy. Same error in logs.

Brody•14mo ago

hmmm link me the library you are using for SQL and I'll see if I can whip something up

jd•14mo ago

Appreciate your help. https://entgo.io/docs/sql-integration/#use-pgx-with-postgresql Using second option currently under configure sql.DB

sql.DB Integration | ent

The following examples show how to pass a custom sql.DB object to ent.Client.

Brody•14mo ago

I think I know the problem, so I will get back to you with a definitive answer soon

jd•14mo ago

Amazing. Thanks again.

Brody•14mo ago

alright, so sql.Open wants a connection string in DSN format, you are providing a URL format and URL and DSN formats are not interchangeable, unfortunately railway doesn’t offer a DSN connection string variable so we have to construct our own. set this service variable in the raw editor

MYSQL_DSN=${{MySQL.MYSQLUSER}}:${{MySQL.MYSQLPASSWORD}}@tcp(${{MySQL.MYSQLHOST}}:${{MySQL.MYSQLPORT}})/${{MySQL.MYSQLDATABASE}}

MYSQL_DSN=${{MySQL.MYSQLUSER}}:${{MySQL.MYSQLPASSWORD}}@tcp(${{MySQL.MYSQLHOST}}:${{MySQL.MYSQLPORT}})/${{MySQL.MYSQLDATABASE}}

and heres some example code

mysqlDSN := os.Getenv("MYSQL_DSN")

db, err := sql.Open("mysql", mysqlDSN)
// ...

mysqlDSN := os.Getenv("MYSQL_DSN")

db, err := sql.Open("mysql", mysqlDSN)
// ...

you of cource can still append your query parameters to mysqlDSN like you where originally doing

jd•14mo ago

Ahh good spot. I will give that a go now! Brilliant worked a treat.

Brody•14mo ago

awsome

jd•14mo ago

Thank you.

Brody•14mo ago

no problem!

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failed opening connection to sql: default addr for network