I wanted to reduce my docker image and switched to an alpine base image instead. This lead to problems bash not finding apt. Turns out, I have to use apk instead. However, it does not seem to find the java version I need. Here is my dockerfile
#Use alpine golang
FROM golang:alpine
#Get the code from local code commit repo
WORKDIR /go/src/xxx
COPY . /go/src/xxx
#Install Java and cleanup after in the same layer
RUN apk update && apk add openjdk-8-jre-headless && rm -rf /var/lib/apt/lists/*
#Install dependencies recursively and remove the third_party directory after it has been used for compiling.
RUN go get ./... && go run setup.go && RUN rm -rf third_party
#More commands...
---> 32a6b6b5f196
Step 4/8 : RUN apk update && apk add openjdk-8-jre-headless && rm -rf /var/lib/apt/lists/*
---> Running in bc48930e48be
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
v3.9.4-4-gd5dd5c1cd0 [http://dl-cdn.alpinelinux.org/alpine/v3.9/main]
v3.9.4-5-gcfdf5452f1 [http://dl-cdn.alpinelinux.org/alpine/v3.9/community]
OK: 9766 distinct packages available
openjdk-8-jre-headless (missing):
·[91mERROR: unsatisfiable constraints:
·[0m required by: world[openjdk-8-jre-headless]
The command '/bin/sh -c apk update && apk add openjdk-8-jre-headless && rm -rf /var/lib/apt/lists/*' returned a non-zero code: 1
I have also tried
RUN apk update && apk add -t jessie-backports openjdk-8-jre-headless ca-certificates-java && rm -rf /var/lib/apt/lists/*
According to https://unix.stackexchange.com/questions/342403/openjdk-8-jre-headless-depends-ca-certificates-java-but-it-is-not-going-to-be but that also fails, not sure if the -t flags fault:
Step 4/7 : RUN apk update && apk add -t jessie-backports openjdk-8-jre-headless ca-certificates-java && rm -rf /var/lib/apt/lists/*
---> Running in 1e2ef22e7c16
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
v3.9.4-4-gd5dd5c1cd0 [http://dl-cdn.alpinelinux.org/alpine/v3.9/main]
v3.9.4-5-gcfdf5452f1 [http://dl-cdn.alpinelinux.org/alpine/v3.9/community]
OK: 9766 distinct packages available
·[91mERROR: unsatisfiable constraints:
·[0m openjdk-8-jre-headless (missing):
required by: jessie-backports-0[openjdk-8-jre-headless]
ca-certificates-java (missing):
required by: jessie-backports-0[ca-certificates-java]
The command '/bin/sh -c apk update && apk add -t jessie-backports openjdk-8-jre-headless ca-certificates-java && rm -rf /var/lib/apt/lists/*' returned a non-zero code: 3
You can check how the official alpine OpenJDK image downloads java and follow the same steps
check Dockerfile
In short, you can add the following code in your Dockerfile
# add a simple script that can auto-detect the appropriate JAVA_HOME value
# based on whether the JDK or only the JRE is installed
RUN { \
echo '#!/bin/sh'; \
echo 'set -e'; \
echo; \
echo 'dirname "$(dirname "$(readlink -f "$(which javac || which java)")")"'; \
} > /usr/local/bin/docker-java-home \
&& chmod +x /usr/local/bin/docker-java-home
ENV JAVA_HOME /usr/lib/jvm/java-1.8-openjdk
ENV PATH $PATH:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin
ENV JAVA_VERSION 8u212
ENV JAVA_ALPINE_VERSION 8.212.04-r0
RUN set -x \
&& apk add --no-cache \
openjdk8="$JAVA_ALPINE_VERSION" \
&& [ "$JAVA_HOME" = "$(docker-java-home)" ]
I hope this helps
If you are using an Alpine image then use the below command to add java8
RUN apk add openjdk8-jre