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pushprox-fips

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Chainguard Container for pushprox-fips

Minimal FIPS compliant image with PushProx, a proxy to allow Prometheus to scrape through NAT etc.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/pushprox-fips:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Compatibility Notes

The pushprox-fips Chainguard image is meant to serve as a drop-in replacement for the PushProx image on DockerHub. Like most Chainguard images, this image is minimal, has few-to-zero CVEs and does not run as the root user.

Prerequisites

  • prometheus
  • prometheus-node-exporter (component to scrape)

Getting started

To begin, start the PushProx container with a command like the following:

# pushprox-proxy
docker run --rm cgr.dev/ORGANIZATION/pushprox-fips --help

# pushprox-client
docker run --rm --entrypoint="/app/pushprox-client" cgr.dev/ORGANIZATION/pushprox-fips --help

The PushProx client performs scrapes in a network environment that's not directly accessible by Prometheus. The PushProx proxy is accessible by both the Clients and Prometheus. Each client is identified by its fqdn.

Create isolated docker networks and deploy the target service (node_exporter) and the PushProx client on one network. Then deploy PushProx proxy and Prometheus will be deployed on the other.

Prometheus will scrape the target via the proxy. The client will then poll the proxy for scrape requests. The proxy routes the scrape to the client. This scrape request is executed by the client and the response containing metrics is posted to the proxy.

Create isolated networks

docker network create external-net
docker network create internal-net --internal

Deploy node_exporter

docker run -d --name target \
--network internal-net \
cgr.dev/ORGANIZATION/prometheus-node-exporter-fips:latest

Deploy PushProx proxy

docker run -d --name pushprox-proxy \
--network external-net \
-p 8080:8080 \
cgr.dev/ORGANIZATION/pushprox-fips:latest

Deploy PushProx client

docker run -d --name pushprox-client \
--network internal-net \
--entrypoint="/app/pushprox-client" \
cgr.dev/ORGANIZATION/pushprox-fips:latest \
--proxy-url="http://pushprox-proxy:8080" \
--fqdn="target"

Connect client to external network

docker network connect external-net pushprox-client

Deploy prometheus

  1. Create prometheus scrape config
cat << EOF > prometheus.yml
global:
  scrape_interval: 30s

scrape_configs:
  - job_name: pushprox
    proxy_url: http://pushprox-proxy:8080
    static_configs:
    - targets: ['target:9100']
EOF
  1. Deploy prometheus
docker run -d --name $prometheus_container \
--network external-net \
-p 9090:9090 \
-v ./prometheus.yml:/etc/prometheus/prometheus.yml \
cgr.dev/ORGANIZATION/prometheus-fips:latest \
--config.file=/etc/prometheus/prometheus.yml

Validate target is up and being scraped

curl http://localhost:9090/api/v1/targets | jq -r '.data.activeTargets'

expected response:

[
  {
    "discoveredLabels": {
      "__address__": "target:9100",
      "__metrics_path__": "/metrics",
      "__scheme__": "http",
      "__scrape_interval__": "5s",
      "__scrape_timeout__": "5s",
      "job": "pushprox"
    },
    "labels": {
      "instance": "target:9100",
      "job": "pushprox"
    },
    "scrapePool": "pushprox",
    "scrapeUrl": "http://target:9100/metrics",
    "globalUrl": "http://target:9100/metrics",
    "lastError": "",
    "lastScrape": "2025-07-16T19:59:32.623643339Z",
    "lastScrapeDuration": 0.02758125,
    "health": "up",
    "scrapeInterval": "30s",
    "scrapeTimeout": "30s"
  }
]

Documentation and Resources

What are Chainguard Containers?

Chainguard's free tier of Starter container images are built with Wolfi, our minimal Linux undistro.

All other Chainguard Containers are built with Chainguard OS, Chainguard's minimal Linux operating system designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a development, or -dev, variant.

In all other cases, including Chainguard Containers tagged as :latest or with a specific version number, the container images include only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager.

Although the -dev container image variants have similar security features as their more minimal versions, they include additional software that is typically not necessary in production environments. We recommend using multi-stage builds to copy artifacts from the -dev variant into a more minimal production image.

Need additional packages?

To improve security, Chainguard Containers include only essential dependencies. Need more packages? Chainguard customers can use Custom Assembly to add packages, either through the Console, chainctl, or API.

To use Custom Assembly in the Chainguard Console: navigate to the image you'd like to customize in your Organization's list of images, and click on the Customize image button at the top of the page.

Learn More

Refer to our Chainguard Containers documentation on Chainguard Academy. Chainguard also offers VMs and Libraries — contact us for access.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.

Licenses

Chainguard container images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" tag of this image:

  • Apache-2.0

  • GCC-exception-3.1

  • GPL-3.0-or-later

  • LGPL-2.1-or-later

  • MIT

  • MPL-2.0

For a complete list of licenses, please refer to this Image's SBOM.

Software license agreement

Compliance

This is a FIPS validated image for FedRAMP compliance.

This image is STIG hardened and scanned against the DISA General Purpose Operating System SRG with reports available.

Learn more about STIGsGet started with STIGs

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