Description
Varnish available as container is a base platform for
running Varnish server or building Varnish-based application.
Varnish Cache stores web pages in memory so web servers don't have to create
the same web page over and over again. Varnish Cache serves pages much faster
than any application server, giving the website a significant speed up.
The image can be used as a base image for other applications based on Varnish Cache 6.0 using Openshift's s2i feature.
Usage
For this, we will assume that you are using the rhel8/varnish-6 image, available via varnish:6 imagestream tag in Openshift.
Building a simple sample-app application
in Openshift can be achieved with the following step:
$ oc new-app varnish:6~https://github.com/sclorg/varnish-container.git --context-dir=6/test/test-app/
The same application can also be built using the standalone S2I application on systems that have it available:
$ s2i build https://github.com/sclorg/varnish-container.git --context-dir=6/test/test-app/ rhel8/varnish-6 sample-server
Accessing the application:
$ curl 127.0.0.1:8080
Configuration
No further configuration is required.
S2I build support
The Varnish Cache 6.0 Container image supports the S2I tool (see Usage section).
Note that the default.vcl configuration file in the directory accessed by S2I needs
to be in the VCL format.
Environment variables and volumes
No special environment variables or volumes available.
Troubleshooting
Varnish logs into standard output, so the log is available in the container log. The log can be examined by running:
podman logs <container>
See also
Dockerfile and other sources for this container image are available on
https://github.com/sclorg/varnish-container.
In that repository you also can find another versions of Python environment Dockerfiles.
Dockerfile for CentOS is called Dockerfile, Dockerfile for RHEL7 is called Dockerfile.rhel7,
for RHEL8 it's Dockerfile.rhel8 and the Fedora Dockerfile is called Dockerfile.fedora.
