Don’t run a long Puppeteer task synchronously in a Rails controller. Enqueue it as a background job, run that job in a live worker, and limit browser concurrency to what the container’s measured memory and CPU can support. Then diagnose container exits and Chromium launch failures separately: an OOM kill, a small /dev/shm, missing browser dependencies, and unreaped child processes need different fixes.
Why Puppeteer can take down a Rails container
A Rails controller request and a browser automation task have different lifetimes. When a controller launches Chromium and waits for a screenshot, scrape, or render, the browser competes for resources with the Rails web process. If memory pressure triggers an out-of-memory event, Docker documents that the kernel kills processes in the container by default. The immediate symptom may be a container exit, a failed request, or both; the cause needs to be confirmed from the container’s termination information and resource usage.
Moving browser work to a background queue keeps it out of the HTTP request-response cycle, but it does not make the work free or automatically isolated. A worker in the same container can still compete with Rails for memory and CPU. A separate worker service can provide a stronger resource boundary, at the cost of additional deployment and queue operations.
Rails’ Active Job guide describes background jobs as a way to move long-running or non-critical work out of the request-response cycle. The current guide documents Solid Queue as the default starting with Rails 8.0; older applications or applications configured differently may use another adapter. Check your actual Rails version and config.active_job.queue_adapter before adopting a setup. Rails Active Job Basics; Docker resource constraints.
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Move browser work out of the controller
Enqueue a job and return promptly
Keep the controller responsible for validating and authorizing the request, enqueueing work, and returning an accepted response or job identifier. Pass serializable identifiers and arguments to the job rather than browser objects or other live resources.
class BrowserTaskJob < ApplicationJob
queue_as :browser
def perform(record_id)
record = Record.find(record_id)
# Invoke the browser integration here and persist the result.
# Ensure browser resources are closed on both success and failure.
end
end
class BrowserTasksController < ApplicationController
def create
job = BrowserTaskJob.perform_later(params.require(:record_id))
render json: { job_id: job.job_id }, status: :accepted
end
endThis is an architecture sketch, not drop-in code for a particular application: it does not define your browser wrapper, authorization policy, queue adapter, result persistence, or job-status endpoint. The client needs a separate way to learn whether the job completed and to retrieve its result.
Make sure a worker is actually running
Enqueuing is only half the system. The configured backend must accept the job, and a worker must be running to process it. For Solid Queue, Rails documents starting workers with bin/jobs start; its worker configuration includes thread and process counts. Other adapters, such as Sidekiq or GoodJob, have their own service and configuration requirements. Consult the guide for your adapter and deployment rather than assuming a web process will run queued jobs.
The in-process async adapter is not the same as a durable independent worker: Rails documents that its jobs are held in memory and outstanding work can be lost if the process crashes or the machine resets. Choose a backend according to the reliability your task needs. Rails Active Job Basics.
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Close browser resources and reap child processes
Scope the browser lifecycle to the job. Close pages and the browser in cleanup paths on both success and failure, and make sure Chrome’s child processes are reaped. Puppeteer’s Docker guidance recommends an init process, such as Docker’s --init, to manage child processes. Process cleanup helps avoid accumulating stray processes; it does not solve an undersized memory limit. Puppeteer Docker guide.
Choose where the browser worker runs
| Architecture | What it helps with | Trade-off |
|---|---|---|
| Browser work in the controller request | Can return the browser result in the same request when the client truly needs it synchronously. | Browser runtime and resource use affect request latency and the web process; long work can outlast request or platform limits. |
| Queued worker in the same container | Decouples browser task duration from the HTTP response and keeps controller code thin. | Rails and Chromium still share the container’s CPU and memory budget; a worker must be started and monitored. |
| Separate browser-worker service | Allows browser workload resources and concurrency to be managed separately from the web service. | Adds deployment, queue, monitoring, and service-configuration work. |
These are architectural trade-offs, not measured performance results. If the user needs a browser result before the HTTP response, synchronous execution may be necessary, but it still needs a realistic request budget and resource limits. Otherwise, prefer a queue and worker; isolate the worker when shared-container contention remains a problem. Rails’ queue model and Puppeteer’s Docker requirements make the relevant operational differences explicit. Rails Active Job Basics; Puppeteer Docker guide.
Build and run Chromium with Docker requirements in mind
Installing the Puppeteer package alone does not guarantee that a container can launch Chrome. The browser needs compatible Linux libraries, a workable sandbox configuration, and writable locations for its profile and cache. Puppeteer’s official Docker image includes Chrome for Testing and its dependencies, runs in sandbox mode, and its documented setup requires the SYS_ADMIN capability. Follow the current image guidance rather than copying a capability setting into a different image or runtime without understanding its security implications. The guide also recommends an init process for child-process management. Puppeteer Docker guide.
If you build a custom image, check the browser dependencies, browser/image compatibility, user permissions, sandbox setup, and writable Chrome configuration, cache, and user-data paths. In a read-only container, explicitly provide writable locations where Chrome needs them. Use the troubleshooting guide for the error you actually see; a generic flag change can obscure the real cause. Puppeteer troubleshooting.
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Set browser concurrency from measurements
Do not assume one browser job per worker thread is safe, or copy a concurrency number from another deployment. Each concurrent browser task adds workload alongside the Rails server and any other processes in the container. Start conservatively, observe memory and CPU during representative jobs, then adjust worker threads, processes, or per-job concurrency. Solid Queue exposes worker thread and process configuration and per-job concurrency controls, but the right values depend on the application, pages, and container limits.
- Measure under the heaviest browser pages and task patterns your application supports, not only a trivial page.
- Watch total container usage while Rails requests and browser jobs run together.
- Reduce simultaneous browser jobs if usage approaches the configured memory limit or CPU saturation makes work unstable.
- Increase a resource limit or move browser work to a separate service only after evidence points to resource pressure.
Docker’s Linux CLI memory statistic subtracts cache usage, so interpret docker stats accordingly. A single displayed number is not a complete explanation of an exit; pair it with the configured limit and the container’s exit or OOM evidence. Docker container stats; Docker resource constraints.
Diagnose the failure before changing Chromium flags
Container exited or was killed under memory pressure
- Check the container or hosting platform’s termination reason and exit information; inspect kernel or platform OOM events where available.
- Check the configured memory limit and observe usage with
docker statswhile reproducing representative browser jobs. - If evidence points to memory pressure, lower browser-job concurrency, increase the container’s memory budget, or isolate browser work in a separately resourced worker.
Docker’s default behavior is to let the kernel kill processes in a container when an OOM error occurs. Do not treat a browser launch flag or an init process as a substitute for a sufficient memory budget. Docker resource constraints; Docker container stats.
Chromium fails to launch
Look for missing shared libraries, an incompatible browser image, sandbox or capability problems, incorrect user permissions, or unwritable profile and cache paths. Check the specific Chromium error and the image’s configuration. Puppeteer’s troubleshooting guide also describes errors such as spawn ENOMEM and chrome_crashpad_handler: --database is required; the strings alone do not prove that the whole container was OOM-killed. Puppeteer troubleshooting.
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Shared-memory errors or Chromium crashes
Puppeteer’s troubleshooting guide says Docker’s default /dev/shm size is 64 MB. That is a documented Docker default, not a guarantee for every host or runtime. If the observed failure indicates shared-memory pressure, Puppeteer documents --disable-dev-shm-usage as a workaround that directs those files to /tmp:
const browser = await puppeteer.launch({
args: ['--disable-dev-shm-usage'],
});Use it as a targeted workaround, ensure /tmp is writable, and do not mistake it for more total container memory. If overall memory is the problem, address the memory budget or concurrency instead. Puppeteer troubleshooting.
Child processes accumulate
Configure a proper init process as PID 1 or run the container with Docker’s --init option, as Puppeteer recommends. This addresses child-process management; it is distinct from increasing memory or changing /dev/shm. Puppeteer Docker guide.
Work slows after the request returns
Some runtime platforms change CPU allocation after responding to a request. Puppeteer’s troubleshooting documentation gives Google Cloud Run as a specific example. Verify whether your own platform behaves this way before attributing post-response slowdown to a general Docker behavior. Puppeteer troubleshooting.
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Frequently asked questions
Does putting Puppeteer in a background job guarantee the container will stay up?
No. A worker removes browser work from the controller’s request path, but jobs still consume resources. Concurrency and container limits must be set for the workload and checked against actual usage.
Should I always add --disable-dev-shm-usage?
No. Use it when shared-memory pressure is implicated in the failure. It redirects relevant files to /tmp; it does not raise the container’s total memory limit.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIs Rails 8 required to use Solid Queue?
No. The Rails guide documents Solid Queue as the default starting with Rails 8.0, but applications may use other adapters. Verify the adapter configured in your application and follow its worker instructions.
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