Spotter-VM/postfix/Dockerfile

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Docker
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FROM alpine
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MAINTAINER Disassembler <disassembler@dasm.cz>
RUN \
# Create OS user (which will be picked up later by apk add)
addgroup -S -g 587 postfix \
&& adduser -S -u 587 -h /var/spool/postfix -s /bin/false -g postfix -G postfix postfix \
# Add edge/main repository
&& echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/main' >>/etc/apk/repositories \
# Install Postfix 3.3
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&& apk --no-cache add ca-certificates postfix@edge \
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# Build aliases database
&& newaliases \
# Cleanup
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&& sed -ir '/^(#.*)?$/d' /etc/postfix/aliases \
&& rm -r /etc/postfix/access /etc/postfix/canonical /etc/postfix/dynamicmaps.cf* /etc/postfix/generic /etc/postfix/header_checks /etc/postfix/postfix-files.d /etc/postfix/relocated /etc/postfix/transport /etc/postfix/virtual
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COPY docker/ /
VOLUME ["/etc/postfix", "/var/spool/postfix"]
EXPOSE 25
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CMD ["s6-svscan", "/etc/services.d"]