infochanged

Containers - exec() is now available for Containers

Announced: 2026-06-18
Tags: Containers
Severity: info, set by reef/rss-rule-v1
Source: https://developers.cloudflare.com/changelog/post/2026-06-18-container-exec/

<code>exec()</code> is now available for <a href="https://developers.cloudflare.com/containers/">Containers</a>. Use <code>this.ctx.container.exec()</code> to start processes inside a running Container, stream standard input and output, inspect exit codes, and signal each process. Call <code>exec()</code> from a class extending <code>Container</code>, or from another Durable Object through <code>this.ctx.container</code>. The associated Container must already be running. This example starts the Container when needed, then reads its Node.js version: <div><div data-nb-tabs data-nb-sync-key="workersExamples" class><div class="relative flex border-b border-border" role="tablist" data-nb-tabs-list></div><div class="mt-3"><div role="tabpanel" data-nb-tabs-content data-nb-tab-label="JavaScript" class><figure class="nb-code-figure nb-code-figure-titled" data-nb-lang="js"><figcaption class="nb-code-title">src/index.jsjs</figcaption><pre class="astro-code astro-code-themes github-light github-dark nb-shiki-c6xiwz" tabindex="0" data-language="js" data-nb-lang="js"><code>import { Container } from "@cloudflare/containers"; export class MyContainer extends Container { async readVersion() { if (!this.ctx.container.running) { await this.start(); } const process = await this.ctx.container.exec(["node", "--version"]); const output = await process.output(); const decoder = new TextDecoder(); return { exitCode: output.exitCode, stdout: decoder.decode(output.stdout), stderr: decoder.decode(output.stderr), }; } }</code></pre></figure></div><div role="tabpanel" data-nb-tabs-content data-nb-tab-label="TypeScript" class><figure class="nb-code-figure nb-code-figure-titled" data-nb-lang="ts"><figcaption class="nb-code-title">src/index.tsts</figcaption><pre class="astro-code astro-code-themes github-light github-dark nb-shiki-c6xiwz" tabindex="0" data-language="ts" data-nb-lang="ts"><code>import { Container } from "@cloudflare/containers"; export class MyContainer extends Container { async readVersion() { if (!this.ctx.container.running) { await this.start(); } const process = await this.ctx.container.exec(["node", "--version"]); const output = await process.output(); const decoder = new TextDecoder(); return { exitCode: output.exitCode, stdout: decoder.decode(output.stdout), stderr: decoder.decode(output.stderr), }; } }</code></pre></figure></div></div></div><script type="module" src="https://developers.cloudflare.com/home/runner/work/cloudflare-docs/cloudflare-docs/src/components/ui/tabs/Tabs.astro?astro&type=script&index=0&lang.ts"></script></div> The command array starts an executable directly, without an implicit shell. Invoke a shell explicitly for pipes, redirects, or variable expansion. One RPC method can coordinate multiple <code>exec()</code> calls in one caller-to-Durable Object round trip. It can also pass byte-oriented <code>ReadableStream</code> input or return streamed output with flow control. For options and streaming examples, refer to <a href="https://developers.cloudflare.com/containers/guides/execute-commands/">Execute commands</a>.

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