Does Alpine Linux handle certs differently than Busybox? - docker

Question

I started with a base image errordeveloper/oracle-jdk. This Dockerfile is shown here for reference:
FROM progrium/busybox
MAINTAINER Ilya Dmitrichenko <errordeveloper#gmail.com>
RUN opkg-install curl ca-certificates
ENV JAVA_HOME /usr/jdk1.8.0_31
RUN curl \
--silent \
--location \
--retry 3 \
--cacert /etc/ssl/certs/GeoTrust_Global_CA.crt \
--header "Cookie: oraclelicense=accept-securebackup-cookie;" \
"http://download.oracle.com/otn-pub/java/jdk/8u31-b13/jdk-8u31-linux-x64.tar.gz" \
| gunzip \
| tar x -C /usr/ \
&& ln -s $JAVA_HOME /usr/java \
&& rm -rf $JAVA_HOME/src.zip $JAVA_HOME/javafx-src.zip $JAVA_HOME/man
ENV PATH ${PATH}:${JAVA_HOME}/bin
ENTRYPOINT [ "java" ]
CMD [ "-version" ]
I'd like to move this to Alpine Linux, so a made the following changes:
FROM alpine
MAINTAINER Ilya Dmitrichenko <errordeveloper#gmail.com>
RUN apk --update upgrade && apk add curl ca-certificates && rm -rf /var/cache/apk/*
ENV JAVA_HOME /usr/jdk1.8.0_31
RUN curl \
--silent \
--location \
--retry 3 \
--cacert /etc/ssl/certs/GeoTrust_Global_CA.crt \
--header "Cookie: oraclelicense=accept-securebackup-cookie;" \
"http://download.oracle.com/otn-pub/java/jdk/8u31-b13/jdk-8u31-linux-x64.tar.gz" \
| gunzip \
| tar x -C /usr/ \
&& ln -s $JAVA_HOME /usr/java \
&& rm -rf $JAVA_HOME/src.zip $JAVA_HOME/javafx-src.zip $JAVA_HOME/man
ENV PATH ${PATH}:${JAVA_HOME}/bin
ENTRYPOINT [ "java" ]
CMD [ "-version" ]
Mainly I changed the package management tool to pull down curl and ca-certificates.
After confirming the original builds clean on my machine (it does) I tried my version and got this error: (I turned off --silent on the curl to see it)
Step 4 : RUN curl --location --retry 3 --cacert /etc/ssl/certs/GeoTrust_Global_CA.crt --header "Cookie: oraclelicense=accept-securebackup-cookie;" "http://download.oracle.com/otn-pub/java/jdk/8u31-b13/server-jre-8u31-linux-x64.tar.gz" | gunzip | tar x -C /usr/ && ln -s $JAVA_HOME /usr/java && rm -rf $JAVA_HOME/man
---> Running in c91e4939f851
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (77) error setting certificate verify locations:
CAfile: /etc/ssl/certs/GeoTrust_Global_CA.crt
CApath: none
gunzip: invalid magic
tar: short read
The command '/bin/sh -c curl --location --retry 3 --cacert /etc/ssl/certs/GeoTrust_Global_CA.crt --header "Cookie: oraclelicense=accept-securebackup-cookie;" "http://download.oracle.com/otn-pub/java/jdk/8u31-b13/server-jre-8u31-linux-x64.tar.gz" | gunzip | tar x -C /usr/ && ln -s $JAVA_HOME /usr/java && rm -rf $JAVA_HOME/man' returned a non-zero code: 1
Does Alpine do something different here? Why might my curl/certs be failing?

Answer 1

Just to be sure the CA certificates are created/updated where they are supposed to, try and add (after this answer) update-ca-certificates:
apk add ca-certificates
update-ca-certificates
In your case:
RUN apk --update upgrade && \
apk add curl ca-certificates && \
update-ca-certificates && \
rm -rf /var/cache/apk/*