diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..5413f97
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,14 @@
+
+name: Check
+
+on: [push, pull_request]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: denoland/setup-deno@v1
+      with:
+        deno-version: v1.x
+    - run: ./src/check.ts
diff --git a/.gitignore b/.gitignore
index 3a81145..efdf306 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,5 @@ services/webhook-handler
 !/.gitignore
 !/README.md
 !/SETUP.md
+
+!.github
diff --git a/src/check.ts b/src/check.ts
new file mode 100755
index 0000000..70c0f70
--- /dev/null
+++ b/src/check.ts
@@ -0,0 +1,58 @@
+#!/usr/bin/env -S COLI_CONC_BASE=. deno run --allow-env --allow-read --allow-sys --ext=ts
+
+/**
+ * Checks docker-compose.yml files for issues:
+ * 
+ * - Duplicate service names
+ * 
+ * Ideas for other issues to check:
+ * 
+ * - restart directive
+ * - Docker networks
+ * - volume paths
+ */
+
+Deno.env.set("FORCE_COLOR", "2")
+import { existsSync } from "https://deno.land/std/fs/mod.ts"
+
+// Determine available targets by reading docker-compose.yml files in service subfolders
+import { parse as parseYaml } from "https://deno.land/std@0.207.0/yaml/mod.ts"
+import { getEnv } from "../src/utils.ts"
+const { servicePath } = getEnv("")
+
+const serviceNamesToComposeFiles = {}
+let ok = true
+
+for await (const { name, isDirectory } of Deno.readDir(servicePath)) {
+  if (!isDirectory) {
+    continue
+  }
+  try {
+    // Try to read docker-compose.yml
+    const file = `${servicePath}/${name}/docker-compose.yml`
+    const fileShort = file.replace(servicePath, "")
+    const compose = parseYaml(await Deno.readTextFile(file))
+    const errors: String[] = []
+    for (const service of Object.keys(compose?.services || {})) {
+      if (serviceNamesToComposeFiles[service]) {
+        errors.push(`!!! Service "${service}" is already defined in ${serviceNamesToComposeFiles[service]}`)
+        ok = false
+      } else {
+        serviceNamesToComposeFiles[service] = fileShort
+      }
+    }
+    if (errors.length) {
+      console.error(`%c${fileShort}`, "color: red")
+      errors.forEach(error => console.error(`%c  ${error}`, "color: red"))
+    } else {
+      console.log(`%c${fileShort}`, "color: green")
+      console.log("%c  All good.", "color: green")
+    }
+  } catch (_) {
+    // Just ignore errors as we are expecting them
+  }
+}
+
+if (!ok) {
+  Deno.exit(1)
+}