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# aws
s
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s
My code is:
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const readReplica = new aws.rds.Instance('read-replica', {
  engine: 'postgres',
  engineVersion: '13',
  instanceClass: instanceClass,
  allocatedStorage: 5,
  dbSubnetGroupName: dbSubnetGroup.id,
  vpcSecurityGroupIds: [dbSecurityGroup.id],
  name: dbName,
  username: dbUsername,
  password: dbPassword,
  allowMajorVersionUpgrade: false,
  autoMinorVersionUpgrade: true,
  storageEncrypted: true,
  maxAllocatedStorage: 500,
  deletionProtection: true,
  performanceInsightsEnabled: true,
  backupRetentionPeriod: 30,
  replicateSourceDb: db.arn,
});
b
it looks like the dbpassword isn't the same as your master instance?
s
That's almost exactly the same code that generates my main instance, so I don't know how that would happen
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username: dbUsername,
  password: dbPassword,
pulls from the same place
b
I don't think you need to set the master password and username on replicas, try removing those params
s
yeah, looking at https://github.com/terraform-aws-modules/terraform-aws-rds/issues/103 I was just about to try that
Yep, that worked. Thank you!
Hm, but oddly, if I run 
pulumi up
a second time, it wants to change it again.
I created a read replica and it looks fine
but the second time I run pulumi up, I get 
└─ aws:rds:Instance  read-replica  update     [diff: ~replicateSourceDb]
and I believe that will fail if I run it again
Yep,
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aws:rds:Instance (read-replica):
    error: 1 error occurred:
        * updating urn:pulumi:dev::core::aws:rds/instance:Instance::read-replica: 1 error occurred:
        * cannot elect new source database for replication
b
you'll need to see 
ignoreChanges
perhaps?
s
huh, nifty. I've never used that before.
I wonder why I need that here
But adding 
{ ignoreChanges: ['replicateSourceDb']  }
seems to work
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