Self-contained EC2 AMI of the S4 transparent S3 compression gateway with CPU codecs (zstd / gzip) preinstalled. Launch on any general-purpose or compute-optimized instance (t3 / m6i / m7i / c6i / c7i), point your S3 clients at it, and cut S3 storage bytes 50-80 percent for compressible data with zero application changes.
S4 is a drop-in S3-compatible gateway that transparently compresses every object on the way to your S3 bucket. This AMI bundles everything for EC2: Amazon Linux 2023, the container runtime, and the CPU build of S4 (zstd, gzip) preinstalled as a systemd service. No GPU drivers required - this is the CPU companion to the separate GPU AMI listing.
On any general-purpose or compute-optimized instance (t3, t3a, m6i, m7i, c6i, c7i) S4 chooses per object: CPU zstd for text and log data, CPU gzip for legacy interop, passthrough for already-compressed inputs. For integer or columnar payloads at high throughput, use the separate GPU AMI listing.
No application changes: same S3 wire protocol, same SigV4 authentication, same SDK calls. You only change the endpoint URL. Range GET requests stay fast through a sidecar frame index compatible with Parquet and ORC readers. The on-backend format is open, so there is no lock-in: stop the gateway and objects remain readable with the Apache-2.0 s4-codec CLI, the s4-codec Python package, or the s4fs fsspec adapter.
Operate it with built-in day-2 tooling: s4 estimate projects savings before you deploy, s4 migrate retro-compresses existing objects, s4 recompact re-compresses cold data, s4 maintain runs policy-driven maintenance, and s4 savings reports the storage bytes and dollars actually saved. Prometheus metrics and a Grafana dashboard are included.
Setup: launch the AMI on a t3 / m6i / m7i / c6i / c7i instance, attach an IAM instance profile granting access to your bucket, set your S3 endpoint in /etc/s4/s4.env, and start the service. This AMI is billed per instance hour through your AWS bill. The same software is also available free under the Apache-2.0 license.
Highlights
CPU compression preinstalled: zstd and gzip baked into the AMI. Launch on any general-purpose or compute-optimized instance (t3 / m6i / m7i / c6i / c7i) and S4 starts compressing on PUT and decompressing on GET out of the box.
50-80 percent fewer S3 storage bytes for compressible data, with measured per-bucket savings reporting (s4 savings) built in.
Zero application changes and no lock-in: S3 wire-compatible endpoint, and objects stay readable without the gateway via Apache-2.0 CLI / Python / fsspec tooling.
AWS Marketplace now accepts line of credit payments through the PNC Vendor Finance program. This program is available to select AWS customers in the US, excluding NV, NC, ND, TN, & VT.
Try this product free for 14 days according to the free trial terms set by the vendor. Usage-based pricing is in effect for usage beyond the free trial terms. Your free trial gets automatically converted to a paid subscription when the trial ends, but may be canceled any time before that.
S4 - Squished S3: CPU S3 Compression Gateway (EC2 AMI)
Pricing is based on actual usage, with charges varying according to how much you consume. Subscriptions have no end date and may be canceled any time. Alternatively, you can pay upfront for a contract, which typically covers your anticipated usage for the contract duration. Any usage beyond contract will incur additional usage-based costs.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
You pay an hourly software fee tied to the EC2 instance type you launch. The dimensions are not tiers or feature levels. Each one maps to a single instance size within a family, so your cost scales with the compute you pick. Smaller instances like t3.medium carry lower hourly rates, and larger sizes up to the 48xlarge carry higher ones. Families include t3, t3a, m6i, m7i, c6i, c7i, c6a, m6a, and the c7i-flex and m7i-flex options. The software fee bills on your regular AWS invoice, separate from the EC2 compute charge.
Top-of-mind questions for buyers
What do the hourly instance rates cover, and which part of my AWS bill actually gets cheaper?
The hourly rate is a software fee for the compression gateway, charged per running instance-hour. It cuts stored S3 bytes by 50-80% for compressible data. Storage bytes are the only part that shrinks. Request charges, data transfer, and the EC2 compute you launch stay unchanged.
Am I charged the software fee when the instance is stopped?
The software fee meters per running instance-hour on your regular AWS invoice. A stopped instance does not accrue the hourly software fee. Underlying AWS storage for the stopped instance may still apply separately. There are no license keys; metering runs through AWS Marketplace.
How does the software fee combine with my EC2 and S3 costs on the bill?
Three charges apply at once. The hourly software fee bills per chosen instance type. Your EC2 compute bills separately at its own rate. Your S3 storage bills on the reduced byte count after compression. The software fee and EC2 scale with instance size; S3 scales with stored bytes.
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Vendor refund policy
S4 is billed per instance hour on metered usage; charges stop when the instance is terminated. Usage already incurred is generally non-refundable. If you were billed in error or a defect prevented normal use, email aws-support@abyo.net within 30 days with your AWS account ID and the billing period. Valid refunds are processed through AWS Marketplace.
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An AMI is a virtual image that provides the information required to launch an instance. Amazon EC2 (Elastic Compute Cloud) instances are virtual servers on which you can run your applications and workloads, offering varying combinations of CPU, memory, storage, and networking resources. You can launch as many instances from as many different AMIs as you need.
Version release notes
Adds a CloudFormation Quick Launch delivery option. Software identical to version 1.4.1.
Additional details
Usage instructions
Launch this AMI on any general-purpose or compute-optimized instance (t3 / t3a / m6i / m7i / c6i / c7i). Attach an IAM instance profile that grants access to your S3 bucket (the gateway uses the instance role for AWS credentials).
Allow inbound TCP 8014 only from the clients that will use the S3-compatible endpoint; do not expose it to the public internet.
Set your S3 backend in /etc/s4/s4.env: S4_BACKEND_ENDPOINT=https://s3.<your-region>.amazonaws.com and AWS_REGION=<your-region>. S4_PORT defaults to 8014.
Start (or restart) the service: sudo systemctl restart s4 (it is enabled to start on boot).
Point your S3 clients (boto3, aws-sdk, Spark, Trino, DuckDB) at http://<instance>:8014 . No application code changes are required - v1.4.1 accepts any SigV4-signed client (the gateway re-signs to the real backend with its own instance-role credentials); ETag presented is MD5(original payload); ListObjects(V2) is client-transparent by default so aws s3 sync and rclone no longer over-transfer.
CPU codecs (zstd / gzip) are used automatically. For GPU (nvCOMP) compression on integer or columnar payloads, use the separate "GPU S3 Compression Gateway" AMI listing. Logs: journalctl -u s4 -f . Full docs: /home/ec2-user/README-S4.txt and https://github.com/abyo-software/s4#readme
Community support is available through GitHub issues at https://github.com/abyo-software/s4/issues. Marketplace subscribers can email aws-support@abyo.net for best-effort response within 2 business days. Documentation, an operations runbook, and a threat model are included in the repository.
AWS infrastructure support
AWS Support is a one-on-one, fast-response support channel that is staffed 24x7x365 with experienced and technical support engineers. The service helps customers of all sizes and technical abilities to successfully utilize the products and features provided by Amazon Web Services.
Self-contained EC2 AMI of the S4 transparent S3 compression gateway with NVIDIA nvCOMP GPU codecs preinstalled. Launch on a GPU instance (g4dn / g5 / g6), point your S3 clients at it, and cut S3 storage bytes 50-80 percent for compressible data with zero application changes.
Drop-in S3-compatible gateway that transparently compresses every object, cutting S3 storage bytes 50-80 percent for compressible data with zero application changes. This edition bills by measured savings: you pay per GB of backend storage avoided, per hour, at roughly one third of the avoided storage cost.
Drop-in S3-compatible gateway that transparently compresses every object (CPU zstd or GPU nvCOMP), cutting S3 storage bytes 50-80 percent for compressible data with zero application changes. Includes pre-deployment savings estimation and measured-savings reporting.
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