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Q&A When configuring load balancer access logs, what permission does the S3 bucket need?

It needs the s3:PutObject permisson, but the Principal in the policy depends on the AWS region. For instance, in us-east-1, this should work (assuming it will log under s3://test-bucket-access-logs...

posted 6mo ago by philipp.classen‭ · edited 6mo ago by philipp.classen‭

Answer

#3: Post edited by

philipp.classen‭ · 2024-06-20T16:43:12Z (6 months ago)

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It needs the `s3:PutObject` permisson, but the `Principal` in the policy depends on the AWS region. For instance, in `us-east`, this should work (assuming it will log under `s3://test-bucket-access-logs/AWSLogs/<account-name>/`):
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::127311923021:root"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::test-bucket-access-logs/*"
}
]
}
```
As said, the magic number `127311923021` is for `us-east` (N. Virginia) and will differ across regions. The full list can be [found here](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy):
```
US East (N. Virginia) – 127311923021
US East (Ohio) – 033677994240
US West (N. California) – 027434742980
US West (Oregon) – 797873946194
Africa (Cape Town) – 098369216593
Asia Pacific (Hong Kong) – 754344448648
Asia Pacific (Jakarta) – 589379963580
Asia Pacific (Mumbai) – 718504428378
Asia Pacific (Osaka) – 383597477331
Asia Pacific (Seoul) – 600734575887
Asia Pacific (Singapore) – 114774131450
Asia Pacific (Sydney) – 783225319266
Asia Pacific (Tokyo) – 582318560864
Canada (Central) – 985666609251
Europe (Frankfurt) – 054676820928
Europe (Ireland) – 156460612806
Europe (London) – 652711504416
Europe (Milan) – 635631232127
Europe (Paris) – 009996457667
Europe (Stockholm) – 897822967062
Middle East (Bahrain) – 076674570225
South America (São Paulo) – 507241528517
```
If it is successfully configured, it should immediately put a test file called `ELBAccessLogTestFile` in that folder (in this example under `s3://test-bucket-access-logs/AWSLogs/470602773899/ELBAccessLogTestFile`).
Note that the magic numbers above apply only for historical regions; for newer ones that became available after August 2022), it again differs. According to the [same documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy), it now looks like that:
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "logdelivery.elasticloadbalancing.amazonaws.com"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::bucket-name/prefix/AWSLogs/aws-account-id/*"
}
]
}
```

It needs the `s3:PutObject` permisson, but the `Principal` in the policy depends on the AWS region. For instance, in `us-east-1`, this should work (assuming it will log under `s3://test-bucket-access-logs/AWSLogs/<account-name>/`):
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::127311923021:root"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::test-bucket-access-logs/*"
}
]
}
```
As said, the magic number `127311923021` is for `us-east-1` and will differ if the load balancer is in a different region. The full list can be [found here](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy):
```
US East (N. Virginia) – 127311923021
US East (Ohio) – 033677994240
US West (N. California) – 027434742980
US West (Oregon) – 797873946194
Africa (Cape Town) – 098369216593
Asia Pacific (Hong Kong) – 754344448648
Asia Pacific (Jakarta) – 589379963580
Asia Pacific (Mumbai) – 718504428378
Asia Pacific (Osaka) – 383597477331
Asia Pacific (Seoul) – 600734575887
Asia Pacific (Singapore) – 114774131450
Asia Pacific (Sydney) – 783225319266
Asia Pacific (Tokyo) – 582318560864
Canada (Central) – 985666609251
Europe (Frankfurt) – 054676820928
Europe (Ireland) – 156460612806
Europe (London) – 652711504416
Europe (Milan) – 635631232127
Europe (Paris) – 009996457667
Europe (Stockholm) – 897822967062
Middle East (Bahrain) – 076674570225
South America (São Paulo) – 507241528517
```
If it is successfully configured, it should immediately put a test file called `ELBAccessLogTestFile` in that folder (in this example under `s3://test-bucket-access-logs/AWSLogs/470602773899/ELBAccessLogTestFile`).
Note that the magic numbers above apply only for historical regions; for newer ones that became available after August 2022), it again differs. According to the [same documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy), it now looks like that:
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "logdelivery.elasticloadbalancing.amazonaws.com"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::bucket-name/prefix/AWSLogs/aws-account-id/*"
}
]
}
```

#2: Post edited by

philipp.classen‭ · 2024-06-20T16:34:13Z (6 months ago)

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It needs the `s3:PutObject` permisson, but the `Principal` in the policy depends on the AWS region. For instance, in `us-east`, this should work (assuming it will log under `s3://test-bucket-access-logs`):
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::127311923021:root"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::test-bucket-access-logs/*"
}
]
}
```
As said, the magic number `127311923021` is for `us-east` (N. Virginia) and will differ across regions. The full list can be [found here](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy):
```
US East (N. Virginia) – 127311923021
US East (Ohio) – 033677994240
US West (N. California) – 027434742980
US West (Oregon) – 797873946194
Africa (Cape Town) – 098369216593
Asia Pacific (Hong Kong) – 754344448648
Asia Pacific (Jakarta) – 589379963580
Asia Pacific (Mumbai) – 718504428378
Asia Pacific (Osaka) – 383597477331
Asia Pacific (Seoul) – 600734575887
Asia Pacific (Singapore) – 114774131450
Asia Pacific (Sydney) – 783225319266
Asia Pacific (Tokyo) – 582318560864
Canada (Central) – 985666609251
Europe (Frankfurt) – 054676820928
Europe (Ireland) – 156460612806
Europe (London) – 652711504416
Europe (Milan) – 635631232127
Europe (Paris) – 009996457667
Europe (Stockholm) – 897822967062
Middle East (Bahrain) – 076674570225
South America (São Paulo) – 507241528517
```
Note that this applies for historical regions, but for newer one (available after August 2022), it again differs. According to the [same documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy), it now looks like that:
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "logdelivery.elasticloadbalancing.amazonaws.com"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::bucket-name/prefix/AWSLogs/aws-account-id/*"
}
]
}
```

It needs the `s3:PutObject` permisson, but the `Principal` in the policy depends on the AWS region. For instance, in `us-east`, this should work (assuming it will log under `s3://test-bucket-access-logs/AWSLogs/<account-name>/`):
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::127311923021:root"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::test-bucket-access-logs/*"
}
]
}
```
As said, the magic number `127311923021` is for `us-east` (N. Virginia) and will differ across regions. The full list can be [found here](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy):
```
US East (N. Virginia) – 127311923021
US East (Ohio) – 033677994240
US West (N. California) – 027434742980
US West (Oregon) – 797873946194
Africa (Cape Town) – 098369216593
Asia Pacific (Hong Kong) – 754344448648
Asia Pacific (Jakarta) – 589379963580
Asia Pacific (Mumbai) – 718504428378
Asia Pacific (Osaka) – 383597477331
Asia Pacific (Seoul) – 600734575887
Asia Pacific (Singapore) – 114774131450
Asia Pacific (Sydney) – 783225319266
Asia Pacific (Tokyo) – 582318560864
Canada (Central) – 985666609251
Europe (Frankfurt) – 054676820928
Europe (Ireland) – 156460612806
Europe (London) – 652711504416
Europe (Milan) – 635631232127
Europe (Paris) – 009996457667
Europe (Stockholm) – 897822967062
Middle East (Bahrain) – 076674570225
South America (São Paulo) – 507241528517
```
If it is successfully configured, it should immediately put a test file called `ELBAccessLogTestFile` in that folder (in this example under `s3://test-bucket-access-logs/AWSLogs/470602773899/ELBAccessLogTestFile`).
Note that the magic numbers above apply only for historical regions; for newer ones that became available after August 2022), it again differs. According to the [same documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy), it now looks like that:
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "logdelivery.elasticloadbalancing.amazonaws.com"
},
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::bucket-name/prefix/AWSLogs/aws-account-id/*"
}
]
}
```

#1: Initial revision by

philipp.classen‭ · 2024-06-20T16:31:17Z (6 months ago)

Copy Link

Raw

Markdown

It needs the `s3:PutObject` permisson, but the `Principal` in the policy depends on the AWS region. For instance, in `us-east`, this should work (assuming it will log under `s3://test-bucket-access-logs`):

```
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::127311923021:root"
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::test-bucket-access-logs/*"
        }
    ]
}
```

As said, the magic number `127311923021` is for `us-east` (N. Virginia) and will differ across regions. The full list can be [found here](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy):

```
US East (N. Virginia) – 127311923021
US East (Ohio) – 033677994240
US West (N. California) – 027434742980
US West (Oregon) – 797873946194
Africa (Cape Town) – 098369216593
Asia Pacific (Hong Kong) – 754344448648
Asia Pacific (Jakarta) – 589379963580
Asia Pacific (Mumbai) – 718504428378
Asia Pacific (Osaka) – 383597477331
Asia Pacific (Seoul) – 600734575887
Asia Pacific (Singapore) – 114774131450
Asia Pacific (Sydney) – 783225319266
Asia Pacific (Tokyo) – 582318560864
Canada (Central) – 985666609251
Europe (Frankfurt) – 054676820928
Europe (Ireland) – 156460612806
Europe (London) – 652711504416
Europe (Milan) – 635631232127
Europe (Paris) – 009996457667
Europe (Stockholm) – 897822967062
Middle East (Bahrain) – 076674570225
South America (São Paulo) – 507241528517
```

Note that this applies for historical regions, but for newer one (available after August 2022), it again differs. According to the [same documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/enable-access-logging.html#attach-bucket-policy), it now looks like that:
```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "logdelivery.elasticloadbalancing.amazonaws.com"
      },
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::bucket-name/prefix/AWSLogs/aws-account-id/*"
    }
  ]
}
```

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