Failed to initialize database when running indexer for testnet

[hai-nguyen-van]

I am trying to run the indexer for delphinet as explained at this step. However, I am stuck at this error. I don't understand the error message:

$ dotnet Tzkt.Sync.dll
info: Tzkt.Sync.Program[0]
      Initialize database
crit: Tzkt.Sync.Program[0]
      Failed to initialize database: Resource temporarily unavailable
Unhandled exception. System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (00000001, 11): Resource temporarily unavailable
   at System.Net.Dns.InternalGetHostByName(String hostName)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at Npgsql.NpgsqlConnector.Connect(NpgsqlTimeout timeout)
   at Npgsql.NpgsqlConnector.RawOpen(NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken)
   at Npgsql.NpgsqlConnector.Open(NpgsqlTimeout timeout, Boolean async, CancellationToken cancellationToken)
   at Npgsql.NpgsqlConnection.<>c__DisplayClass32_0.<<Open>g__OpenLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlConnection.Open()
   at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlDatabaseCreator.Exists()
   at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists()
   at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.GetAppliedMigrations()
   at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.GetAppliedMigrations(DatabaseFacade databaseFacade)
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 60
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.IHostExt.Init(IHost host, Int32 attempt) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 83
   at Tzkt.Sync.Program.Main(String[] args) in /home/nguyen-van/tzkt/Tzkt.Sync/Program.cs:line 20
Aborted (core dumped)

Does this mean that it cannot have access to the database? Or to rpc.tzkt.io/delphinet? Yet, the database is available:

$ nmap -PN localhost
Starting Nmap 7.80 ( https://nmap.org ) at 2020-12-29 12:05 CET
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000068s latency).
Not shown: 998 closed ports
PORT     STATE SERVICE
631/tcp  open  ipp
5432/tcp open  postgresql

[Groxan]

This means that the indexer cannot connect to the database using the connection string you provided. Did you customize the connection string somehow? Also, look at the similar issue npgsql/efcore.pg#619 (comment), and let me know if that helps. You can find allowed connection string parameters here: https://www.npgsql.org/doc/connection-string-parameters.html

Also, try to connect to the database manually via psql with the same user as in the connection string, to make sure the database is available.

[hai-nguyen-van]

My bad! I found the tiny spot of the problem.