Varnish Cache 4.0 HTTP reverse proxy Docker image

This container image includes Varnish 4.0 Cache server and a reverse proxy for OpenShift and general usage. Users can choose between RHEL and CentOS based images. The RHEL image is available in the Red Hat Container Catalog as registry.access.redhat.com/rhscl/varnish-4-rhel7. The CentOS image is then available on Docker Hub as centos/varnish-4-centos7.

Description

Varnish available as docker 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 4.0 or using s2i tool.

Usage

To build a simple sample-app application using standalone S2I and then run the resulting image with Docker execute:

• For RHEL based image

   $ docker pull registry.access.redhat.com/rhscl/varnish-4-rhel7
   $ s2i build https://github.com/sclorg/varnish-container.git --context-dir=4/test/test-app/ registry.access.redhat.com/rhscl/varnish-4-rhel7 sample-server
   $ docker run -p 8080:8080 sample-server
  

• For CentOS based image

   $ docker pull centos/varnish-4-centos7
   $ s2i build https://github.com/sclorg/varnish-container.git --context-dir=4/test/test-app/ centos/varnish-4-centos7 sample-server
   $ docker run -p 8080:8080 sample-server
  

Accessing the application:

$ curl 127.0.0.1:8080

Configuration

No further configuration is required.

S2I build support

The Varnish Cache 4.0 Docker 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:

docker logs <container>

See also

Dockerfile and other sources for this container image are available on https://github.com/sclorg/varnish-container. In that repository, Dockerfile for CentOS is called Dockerfile, Dockerfile for RHEL is called Dockerfile.rhel7.