1 files changed, 50 insertions, 0 deletions
diff --git a/jstests/replsets/single_node_set_new_hostname.js b/jstests/replsets/single_node_set_new_hostname.js
new file mode 100644
index 00000000000..43b21a18998
--- /dev/null
+++ b/jstests/replsets/single_node_set_new_hostname.js
@@ -0,0 +1,50 @@
+/*
+ * When a one-node set is restarted on a different port and reconfigured with the new port, it
+ * should re-elect itself.
+ *
+ * @tags: [
+ *     requires_persistence,
+ * ]
+ */
+(function() {
+    "use strict";
+
+    load("jstests/replsets/rslib.js");
+
+    const replTest = new ReplSetTest({nodes: 1});
+    replTest.startSet();
+    replTest.initiate();
+    replTest.getPrimary();
+
+    /*
+     * Prepare to restart the sole node on a new port, it no longer finds itself in the old config.
+     */
+    const config = replTest.getReplSetConfigFromNode(0);
+    const newPort = replTest.getPort(0) + 1;
+    const hostname = config.members[0].host.split(":")[0];
+    const newHostAndPort = `${hostname}:${newPort}`;
+
+    jsTestLog("Restarting the sole node on a new port: " + newPort);
+    replTest.restart(0, {port: newPort});
+    let restartedNode;
+    assert.soonNoExcept(() => {
+        restartedNode = new Mongo(newHostAndPort);
+        return true;
+    }, `Couldn't connect to restarted node "${newHostAndPort}`);
+    waitForState(restartedNode, ReplSetTest.State.REMOVED);
+
+    /*
+     * Update the config to match the node's new port.
+     */
+    jsTestLog("Reconfiguring the set to change the sole node's port.");
+    jsTestLog(`Original config: ${tojson(config)}`);
+    config.version++;
+    config.members[0].host = newHostAndPort;
+    jsTestLog(`New config: ${tojson(config)}`);
+    // Force reconfig since the restarted node is in REMOVED state, not PRIMARY.
+    assert.commandWorked(
+        restartedNode.getDB("admin").runCommand({replSetReconfig: config, force: true}));
+    waitForState(restartedNode, ReplSetTest.State.PRIMARY);
+
+    replTest.stopSet();
+}());