Fastly will upload log messages to the S3 bucket in the format specified in the S3 object.

Data model

access_keystringYour S3 account access key.
aclstringThe access control list (ACL) specific request header. See the AWS documentation for Access Control List (ACL) Specific Request Headers for more information.
bucket_namestringThe bucket name for S3 account.
compression_codecstringThe codec used for compression of your logs. Valid values are zstd, snappy, and gzip. If the specified codec is "gzip", gzip_level will default to 3. To specify a different level, leave compression_codec blank and explicitly set the level using gzip_level. Specifying both compression_codec and gzip_level in the same API request will result in an error.
created_atstringDate and time in ISO 8601 format.
deleted_atstringDate and time in ISO 8601 format.
domainstringThe domain of the Amazon S3 endpoint.
formatstringA Fastly log format string.
format_versionintegerThe version of the custom logging format used for the configured endpoint. The logging call gets placed by default in vcl_log if format_version is set to 2 and in vcl_deliver if format_version is set to 1.
1Version 1 log format.
2Version 2 log format.
gzip_levelintegerWhat level of gzip encoding to have when sending logs (default 0, no compression). If an explicit non-zero value is set, then compression_codec will default to "gzip." Specifying both compression_codec and gzip_level in the same API request will result in an error.
message_typestringHow the message should be formatted.
blankNo prefix. Useful for writing JSON and CSV.
classic(default) RFC 3164 syslog prefix.
logglyRFC 5424 structured syslog.
logplexHeroku-style length prefixed syslog.
namestringThe name for the real-time logging configuration.
pathstringThe path to upload logs to.
periodintegerHow frequently log files are finalized so they can be available for reading (in seconds, default 3600).
placementstringWhere in the generated VCL the logging call should be placed. If not set, endpoints with format_version of 2 are placed in vcl_log and those with format_version of 1 are placed in vcl_deliver.
noneDo not render a log statement into VCL. Use this option if you intend to write a log statement manually.
waf_debugPut the log statement in the waf_debug_log subroutine, which allows for logging of WAF-specific variables.
public_keystringA PGP public key that Fastly will use to encrypt your log files before writing them to disk.
redundancystringThe S3 redundancy level.
response_conditionstringThe name of an existing condition in the configured endpoint, or leave blank to always execute.
secret_keystringYour S3 account secret key.
server_side_encryptionstringSet this to AES256 or aws:kms to enable S3 Server Side Encryption.
server_side_encryption_kms_key_idstringOptional server-side KMS Key Id. Must be set if server_side_encryption is set to aws:kms or AES256.
service_idstringAlphanumeric string identifying the service.
timestamp_formatstringDate and time in ISO 8601 format.
updated_atstringDate and time in ISO 8601 format.
versionintegerInteger identifying a service version.


List AWS S3 log endpoints


Create an AWS S3 log endpoint


Get an AWS S3 log endpoint


Update an AWS S3 log endpoint


Delete an AWS S3 log endpoint