uSING DOCKERFILES TO SHARE IMAGES
sHARING IMAGES
Shipping images can be painful
docker pull goldmann/wildfly
117mb download with Fedora images cached locally
SHARING images
It's even worse if you don't have a registry
docker export 6f91f81c9293 > wildfly.tar
Creates 1.7G file700MB after gzip compression
getting the latest bits
Use the latest base image
No need to:
apt-get update
yum update
trusting images
Unless you know how an images is built, you shouldn't trust it
Dockerfiles show how the images is built:
FROM fedora
RUN yum install -y wildfly
EXPOSE 8080
ENTRYPOINT ["/usr/share/wildfly/bin/launch.sh"]
trusted build
Pulls the Dockerfile from git
Allows others to view source
Builds the images from the Dockerfile
wildfly8 example
FROM fedora
Downloads the latest fedora image from the docker indexWILDFLY8 EXAMPLE
RUN yum install -y wildfly
Downloads the Wildfly 8 bits from the fedora repoWILDFLY 8 EXAMPLE
EXPOSE 8080
Exposes port 8080 from the containerWILDFLY 8 ExAmple
ENTRYPOINT ["/usr/share/wildfly/bin/launch.sh]
Sets the default executable to runWILDFLY 8 EXAMPLE
FROM fedora
RUN yum install -y wildfly
EXPOSE 8080
ENTRYPOINT ["/usr/share/wildfly/bin/launch.sh"]
Build it:docker build -t wildfly8 .
Run it:docker run wildfly8
Dockerfile
By Jason Shepherd
Dockerfile
- 846