Dockerfile

FROM centos:7
LABEL maintainer "Phase2 <outrigger@phase2technology.com>"

# Install our yum wrapper.
COPY root /

# Install base packages.
RUN yum -y install epel-release yum-plugin-ovl deltarpm && \
    yum -y update && \
    yum -y install sudo ssh curl less vim-minimal dnsutils openssl && \
    yum clean all

# Add the s6 overlay.
ENV S6_VERSION v1.19.1.1
RUN curl -L "https://github.com/just-containers/s6-overlay/releases/download/$S6_VERSION/s6-overlay-amd64.tar.gz" > /tmp/s6-overlay-amd64.tar.gz
RUN tar xzf /tmp/s6-overlay-amd64.tar.gz -C / --exclude="./bin" && \
    tar xzf /tmp/s6-overlay-amd64.tar.gz -C /usr ./bin
ENV S6_BEHAVIOUR_IF_STAGE2_FAILS 1

# Download confd.
ENV CONFD_VERSION 0.11.0
RUN curl -L "https://github.com/kelseyhightower/confd/releases/download/v$CONFD_VERSION/confd-$CONFD_VERSION-linux-amd64" > /usr/bin/confd && \
    chmod +x /usr/bin/confd
ENV CONFD_OPTS '--backend=env --onetime'

# Run the s6-based init.
ENTRYPOINT ["/init"]

# Set up a standard volume for logs.
VOLUME ["/var/log/services"]