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Langflow on Ubuntu 24.04 LTS — Support & Quick Start

Langflow on Ubuntu 24.04 LTS — Langflow is a visual builder for LLM applications: drag-and-drop chains, agents, and RAG pipelines on top of LangChain. Published by Derek Coleman & Associates Inc on the Azure Marketplace, deployed in your own Azure subscription.

Email support Product page Azure Marketplace listing

Fixed on image version 2026.916.1356 (published 2026-09-16)

First boot now waits up to 15 minutes for Langflow's slow first start (it needs about 3 minutes on a 4-vCPU VM) and verifies the generated sign-in against the running service before reporting done, on a fresh build of the current Langflow release.

If you deployed this VM before 2026-09-16, it came from the older image and is not changed by the new publication — redeploy from the current Marketplace version, or apply the one-time repair below:

  1. On a VM from an earlier image the credential file was still written correctly — first boot simply gave up waiting. Give Langflow several more minutes (`sudo journalctl -u langflow -f`), then sign in at http://<VM-IP>:7860/ as dcaadmin with the password in /var/lib/langflow/admin-password.

Image change: see the pull request.

Source: the Marketplace live version set for this offer, read from Partner Center on 2026-09-16. New deployments take the newest version by default.

At a glance

Application ports7860 (web UI)
Open in browserhttp://<VM-IP>:7860/
Admin credential filesudo cat /var/lib/langflow/admin-password
Sign in asdcaadmin
Service(s)langflow
Configuration/opt/langflow/ (venv + data in /opt/langflow/data/)
Logsjournalctl -u langflow -f
VersionLangflow 1.12.4 (Python 3.12 venv)
PlatformUbuntu 24.04 LTS

Quick start

  1. Deploy from the Azure Marketplace (Get It Now → Create), choosing your SSH key at the Administration step.
  2. Allow inbound SSH (22) for yourself plus the application port(s): 7860 (web UI) — restrict to your own IP where possible. The in-image firewall already allows them; only the Network Security Group (NSG) keeps them closed.
  3. Open http://<VM-IP>:7860/ and sign in as dcaadmin (see First login below).
  4. Add your model provider keys in Settings → Global Variables and build your first flow.

First login / credentials

This image generates its admin credential on the VM at first boot — nothing is pre-set. SSH into the VM with the username + key you chose at deploy, then print the generated credential:

ssh <your-username>@<VM-IP>
sudo cat /var/lib/langflow/admin-password

Sign in as dcaadmin.

  1. Print the credential file: LANGFLOW_SUPERUSER=dcaadmin and LANGFLOW_SUPERUSER_PASSWORD.
  2. Open http://<VM-IP>:7860/ and sign in as dcaadmin.
  3. Change the password in Settings and delete the file once stored securely.

Sign in as dcaadmin with the password in the file. Langflow allows 5 sign-in attempts per minute per client address; the next one is answered with HTTP 429 — wait a minute and try again.

Still stuck?

Email support@dcassociatesgroup.com (response within 1 business day) or send a message via the contact form. Include the offer name, VM size, region, and any log output — sudo journalctl -u <service> -n 100 usually tells the story.