Supported operating systems

The following operating systems are supported out-of-the-box:

Tested and fully compatible

Preparing the system

The EVA ICS installer prepares the system automatically, installing required packages. The only necessary pre-installed packages is “curl” to download and start the installation.


Basic install

For a single node, which is going to host a HMI application, type:

sudo -s # the installer script requires root privileges
curl | sh /dev/stdin -a --hmi

If this is a secondary node and no web services / HTTP API are required, omit the “–hmi” argument.


As the installer script always installs at least the minimal list of required system packages, it must be executed under root.

The installer automatically prepares the system, installs the latest EVA ICS distribution to /opt/eva4 (default) folder and sets up Python virtual environment in /opt/eva4/venv (for mode >= 1).

Installer arguments

By adding “-h” or “–help” argument, the full list of the installer arguments can be obtained. Let us review the primary ones:

  • –hmi automatically setups authentication and web HMI services.

  • –mode prepares the system, by installing additional packages:

    • 0 installs the minimal list of required packages

    • 1 installs Python and eva-shell

    • 2 all of the above, plus C and C++ compilers, plus development headers

    • 3 all of the above, plus Rust compiler and additional development headers

The compilers and the development headers can be used to add custom Python modules into venv.

  • –prepare-only allows to install additional compilers / headers, without installing EVA ICS. Can be executed after the installation at any time.

Post-install configuration

Startup and watchdog options can be configured by editing configuration files in /opt/eva4/etc folder (create them from provided examples if missing).

Additional configuration can be performed by editing Registry database keys.

Read more in configuring documentation section.


If the automatic startup has been set up, EVA ICS node is started automatically either by Systemd or by OpenRC (Alpine). To start/stop the node server manually, use either “/opt/eva4/sbin/eva-control” script or eva-shell.

Configuring/rebuilding Python venv

An optional Python virtual environment can be configured using the command:


or by editing “eva/config/python-venv” registry key in eva-shell or in other tools.

/opt/eva4/sbin/venvmgr build

To rebuild the virtual environment from scratch, completely delete /opt/eva4/venv folder or call the above command with -S argument.


Local nodes

To update a local node, use the command:

eva update
# or
/opt/eva4/bin/eva-cloud-manager node update

Remote nodes

If any remote nodes are connected with replication services and configured as managed (admin key is set), they can be updated using cloud-update feature:

eva cloud update
# or
/opt/eva4/bin/eva-cloud-manager cloud update

After being started, the cloud-update firstly gathers facts about the available nodes and after offers the update plan, which must be additionally confirmed.

Remote nodes are always updated to the same version, which the management node has got.