Name

docker-almalinux9-systemd-perl-starman-psgi - Dockerfile for Starman PSGI server running on Alma Linux 9 under Systemd

Docker Image

This Docker image is built from almalinux/9-init.

Systemd

The docker image uses the Systemd configuration from https://serverfault.com/questions/1053187/systemd-fails-to-run-in-a-docker-container-when-using-cgroupv2-cgroupns-priva

Starman

Starman is a high-performance preforking PSGI/Plack web server. We install it with yum from RPMs at DavisNetworks

Systemd Unit File

The Starman Systemd Unit File is installed by the Dockerfile as /usr/lib/systemd/system/starman.service and then enabled with systemctl. Starman is configured to run 3 workers and to listen on port 80 (this port must match the Dockerfile exposed port).

PSGI App

The PSGI App app.psgi is saved inside the Docker image as /app/app.psgi. This path is hard coded in the service file.

PSGI App Dependencies

Dependencies to run the PSGI app inside the container must be installed in the Dockerfile. We install the dependencies for our example PSGI program one from the Alma Linux repositories and from the DavisNetworks.com repository.

• DateTime
• Plack::Middleware::Expires
• Plack::Middleware::Session::Cookie
• Plack::Middleware::Favicon_Simple
• Plack::Middleware::Method_Allow

Docker Build Command

$ make build

Docker Run Command

$ make run

See Also

• CentOS7-Systemd-Mojolicious