localhost:8088: Superset, YARN or Splunk
Port 8088 belongs to data tools. Apache Superset's web app runs on localhost:8088 when started with Docker Compose or superset run -p 8088. Hadoop's YARN ResourceManager shows its cluster UI there, and Splunk receives events on 8088 through the HTTP Event Collector, which is an API, not a page.
| Program | What 8088 is | Typical check |
|---|---|---|
| Apache Superset | Web app and API | Login page; admin user created at setup |
| Hadoop YARN | ResourceManager web UI | /cluster page lists applications |
| Splunk HEC | Event intake API | curl with Authorization: Splunk <token> |
Updated
Each of these takes a while to become ready. Superset waits on its database setup, YARN on the rest of the cluster, so a refused connection right after start can simply mean you are early.
Start Superset on 8088
First-run commands
Set SUPERSET_SECRET_KEY before these commands in recent versions.
superset db upgrade
superset fab create-admin
superset init
superset run -p 8088 --with-threads --reloadSuperset first-run steps
Local installs need a metadata database upgrade, an admin user and an init step before the server starts. Skipping any of them leaves an app that loads but cannot sign you in or shows empty menus.
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How it works
- Identify the tool from its logs or docker ps.
- Wait for the startup to finish before opening the page.
- For Superset, make sure an admin user exists.
- For Splunk, test HEC with curl and a token, not a browser.
Tips
- Superset's docker compose setup runs an init container; the web UI fails until it completes.
- A fresh Superset install without superset fab create-admin leaves you at a login page with no valid user.
- Splunk HEC is often configured for HTTPS, so http requests fail with an empty reply.
- YARN's UI links to node managers on 8042, which may not resolve from your browser outside the cluster network.
Frequently asked questions
What runs on localhost:8088?
Usually Apache Superset, Hadoop YARN's ResourceManager UI or Splunk's HTTP Event Collector.
How do I log in to Superset at localhost:8088?
Use the admin account created during setup. In local installs, run superset db upgrade, then superset fab create-admin, then superset init.
Why does Splunk on 8088 show nothing in a browser?
HEC is an API endpoint for sending events. Post to /services/collector with a token; the Splunk web UI is on 8000.
Why does the YARN UI refuse to connect?
The ResourceManager is not running or listens on a different host name. Check yarn.resourcemanager.webapp.address in yarn-site.xml.
Related: localhost:9090, localhost:8080, localhost:8000, localhost refused to connect.
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