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diff --git a/keyserver/flow-typed/npm/stoppable_vx.x.x.js b/keyserver/flow-typed/npm/stoppable_vx.x.x.js
new file mode 100644
--- /dev/null
+++ b/keyserver/flow-typed/npm/stoppable_vx.x.x.js
@@ -0,0 +1,10 @@
+// flow-typed signature: 4ffffaa246e31defe6bd7054e7869482
+// flow-typed version: <<STUB>>/stoppable_v1.1.0/flow_v0.202.1
+
+declare module 'stoppable' {
+ declare module.exports: {
+ <T: http$Server | ?https$Server>(server: T, grace?: number): T & {
+ +stop: (callback?: (error: ?Error, gracefully: boolean) => void) => void,
+ }
+ }
+}
diff --git a/keyserver/package.json b/keyserver/package.json
--- a/keyserver/package.json
+++ b/keyserver/package.json
@@ -85,6 +85,7 @@
"sharp": "^0.30.5",
"siwe": "^2.1.4",
"sql-template-strings": "^2.2.2",
+ "stoppable": "^1.1.0",
"tcomb": "^3.2.29",
"twin-bcrypt": "^2.1.1",
"uuid": "^3.4.0",
diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -11,6 +11,7 @@
import expressWs from 'express-ws';
import os from 'os';
import qrcode from 'qrcode';
+import stoppable from 'stoppable';
import './cron/cron.js';
import { qrCodeLinkURL } from 'lib/facts/links.js';
@@ -110,6 +111,23 @@
if (cluster.isMaster) {
if (isPrimaryNode) {
+ const healthCheckApp = express();
+ healthCheckApp.use(express.json({ limit: '250mb' }));
+ healthCheckApp.get('/health', (req: $Request, res: $Response) => {
+ res.send('OK');
+ });
+
+ // We use stoppable to allow forcibly stopping the health check server
+ // on the master process so that non-master processes can successfully
+ // initialize their express servers on the same port without conflict
+ const healthCheckServer = stoppable(
+ healthCheckApp.listen(
+ parseInt(process.env.PORT, 10) || 3000,
+ listenAddress,
+ ),
+ 0,
+ );
+
const didMigrationsSucceed: boolean = await migrate();
if (!didMigrationsSucceed) {
// The following line uses exit code 2 to ensure nodemon exits
@@ -117,6 +135,18 @@
// in https://github.com/remy/nodemon/issues/751
process.exit(2);
}
+
+ if (healthCheckServer) {
+ await new Promise((resolve, reject) => {
+ healthCheckServer.stop(err => {
+ if (err) {
+ reject(err);
+ } else {
+ resolve();
+ }
+ });
+ });
+ }
}
if (shouldDisplayQRCodeInTerminal && isPrimaryNode) {
diff --git a/yarn.lock b/yarn.lock
--- a/yarn.lock
+++ b/yarn.lock
@@ -22492,6 +22492,11 @@
resolved "https://registry.yarnpkg.com/stealthy-require/-/stealthy-require-1.1.1.tgz#35b09875b4ff49f26a777e509b3090a3226bf24b"
integrity sha512-ZnWpYnYugiOVEY5GkcuJK1io5V8QmNYChG62gSit9pQVGErXtrKuPC55ITaVSukmMta5qpMU7vqLt2Lnni4f/g==
+stoppable@^1.1.0:
+ version "1.1.0"
+ resolved "https://registry.yarnpkg.com/stoppable/-/stoppable-1.1.0.tgz#32da568e83ea488b08e4d7ea2c3bcc9d75015d5b"
+ integrity sha512-KXDYZ9dszj6bzvnEMRYvxgeTHU74QBFL54XKtP3nyMuJ81CFYtABZ3bAzL2EdFUaEwJOBOgENyFj3R7oTzDyyw==
+
stopwords-iso@^1.1.0:
version "1.1.0"
resolved "https://registry.yarnpkg.com/stopwords-iso/-/stopwords-iso-1.1.0.tgz#dc303db6b0842d4290bc1339b4eaf37b94219395"

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