Running SafeLine WAF in Docker Swarm requires careful validation because the official deployment guide documents Docker Compose, not a dedicated Swarm deployment procedure. The safest approach is to treat Swarm as an infrastructure decision and verify each requirement before adapting the documented installation model.
SafeLine is a self-hosted web application firewall that works as an HTTP and HTTPS reverse proxy. It receives traffic for an original application, filters potentially malicious requests, and forwards safe traffic to the upstream application. The official documentation describes defenses for attacks including SQL injection, XSS, code injection, SSRF, XXE, path traversal, brute force attempts, and HTTP floods. It also documents rate limiting, CAPTCHA challenges, authentication challenges, dynamic HTML and JavaScript protection, and web access control capabilities. See the SafeLine introduction and application protection guide.
Before adapting the installation for Swarm, check the documented baseline. The deployment guide lists Linux, x86_64 or arm64 architecture, Docker 20.10.14 or later, Docker Compose 2.0.0 or later, at least one CPU core, 1 GB of memory, 5 GB of disk space, and SSSE3 CPU support. These requirements are documented for the standard installation path, so confirm how they map to every node that could host SafeLine in your cluster. The guide also says that ARM installation requires a Pro license and that the Personal Edition is not supported on ARM. See the official deployment requirements.
Data placement is another key checkpoint. The documented installation creates a SafeLine directory, writes configuration and data there, downloads a Compose file, creates environment variables, and starts the service with Docker Compose. A Swarm adaptation must preserve the persistence and availability assumptions behind that directory. Before scheduling a service across nodes, decide how the SafeLine data directory and database-related data will remain available to the node running the workload. The supplied documentation does not define a Swarm stack file, storage driver, placement policy, overlay network design, or failover procedure, so those details require independent testing in your environment.
Network routing also needs a deliberate design. SafeLine must receive the public application traffic as the reverse proxy, while the protected application remains the upstream target. In the SafeLine console, the application configuration includes a domain, listening port, optional SSL setting for HTTPS, and the upstream address. The official guide then instructs you to resolve the application domain to the server where SafeLine is installed. In a Swarm environment, confirm that ingress routing, published ports, TLS termination, DNS, and upstream reachability all deliver the same behavior before moving production traffic.
Use a staged validation process. First verify node architecture, Docker version, CPU instructions, memory, and disk capacity. Next confirm persistent storage and access to the SafeLine console. Then create a test application entry and check that a normal request reaches the upstream. Finally, review the console for blocked attack events using controlled test cases such as the SQL injection, XSS, and path traversal examples in the official application guide. Keep testing isolated from systems where these requests could cause harm.
As of September 30, 2026, SafeLine surpassed 700,000 installations worldwide. SafeLine Pro annual promotional pricing is $650-$880 versus the $1,000 regular price. Treat licensing and promotional availability as current commercial information that should be checked through the supplied promotion destination. The official documentation also identifies SafeLine as production-ready and reports its deployment scale in its published materials.
Is Docker Swarm officially documented for SafeLine?
The supplied official deployment guide documents Docker and Docker Compose. It does not provide a Swarm-specific stack file or Swarm operating procedure. Use Swarm only after validating the adaptation against your storage, networking, scheduling, backup, and recovery requirements.
Can I use the documented Compose commands unchanged in Swarm?
The guide documents commands such as docker compose up -d for its standard deployment path. Do not assume those commands constitute a Swarm deployment. Translate the architecture only after confirming that configuration, persistent data, service connectivity, and published ports behave correctly in your cluster.
Where does SafeLine sit in the request path?
SafeLine sits in front of the web application as a reverse proxy. Clients reach SafeLine first, SafeLine evaluates the HTTP or HTTPS traffic, and permitted traffic is forwarded to the configured upstream application.
What should I verify before production traffic is moved?
Verify persistent data, console access, DNS, TLS behavior, published ports, upstream connectivity, node placement, backups, and event visibility. Also confirm that the CPU, memory, disk, Docker, architecture, and SSSE3 requirements from the official deployment guide are satisfied.
Use this checklist to evaluate your Swarm design, then consult the official project and documentation for supported installation details and current guidance. Project: https://github.com/chaitin/SafeLine Documentation: https://docs.waf.chaitin.com/en/home Promotion: https://cyberserval.tech/landing/lto
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