Requirements

We recommend using the following setup:

Virtual Hardware:

• 2 vCPUs

• 8 GB RAM

• 50 GB disc space

Software:

• nginx 1.30.4 https://nginx.org/en/download.html (stable version)

• mongodb 8.3 https://www.mongodb.com/docs/manual/administration/install-on-linux/

• java 17 (jdk) https://www.oracle.com/technetwork/java/javase/downloads/index.html

• mariadb 11.8 (lts) https://mariadb.com/kb/en/mariadb-server-release-dates/

Operating System:

• Debian GNU/Linux 12 “Bookworm”

• Ubuntu 24.04 LTS “Noble Numbat”

• SUSE Linux Enterprise Server (SLES) 15 SP5

• Red Hat Enterprise Linux (RHEL) 9

Network config:

• open frontend 80 / 443 (SSL)

• open backend 9090

Note

The hardware and software requirements are unchanged in 5.0 — it still runs on Java 17.

5.0 does make more use of the WebSocket channel than earlier versions: the workflow test run, the live dashboard metrics and the support-log notifications all depend on it. The backend serves it under /ws on the same port, so no additional port has to be opened, but a reverse proxy in front of OpenCelium must proxy /ws with the Upgrade headers. The shipped conf/nginx_default.conf already does this.

Browser:

• A current version of Chrome, Edge, Firefox or Safari. The frontend is an ES-module build and does not support Internet Explorer.