I have the below Dockerfile for zookeeper and I am trying to create an image for it, but it is giving me an error. I have recently started working with Docker, and started playing with a Zookeeper setup, so I am not able to understand. What does this error mean?
FROM ubuntu:trusty MAINTAINER David RUN apt-get update && apt-get install -y openjdk-7-jre-headless wget ENV JAVA_HOME /usr/lib/jvm/java-7-openjdk-amd64 # Install required packages RUN apk add --no-cache \ bash \ su-exec ENV ZOO_USER=zookeeper \ ZOO_CONF_DIR=/conf \ ZOO_DATA_DIR=/data \ ZOO_DATA_LOG_DIR=/datalog \ ZOO_PORT=2181 \ ZOO_TICK_TIME=2000 \ ZOO_INIT_LIMIT=5 \ ZOO_SYNC_LIMIT=2 # Add a user and make dirs RUN set -x \ && adduser -D "$ZOO_USER" \ && mkdir -p "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR" \ && chown "$ZOO_USER:$ZOO_USER" "$ZOO_DATA_LOG_DIR" "$ZOO_DATA_DIR" "$ZOO_CONF_DIR" ARG GPG_KEY=C823E3E5B12AF29C67F81976F5CECB3CB5E9BD2D ARG DISTRO_NAME=zookeeper-3.4.9 # Download Apache Zookeeper, verify its PGP signature, untar and clean up RUN set -x \ && apk add --no-cache --virtual .build-deps \ gnupg \ && wget -q "" \ && wget -q "" \ && export GNUPGHOME="$(mktemp -d)" \ && gpg --keyserver ha.pool.sks-keyservers.net --recv-key "$GPG_KEY" \ && gpg --batch --verify "$DISTRO_NAME.tar.gz.asc" "$DISTRO_NAME.tar.gz" \ && tar -xzf "$DISTRO_NAME.tar.gz" \ && mv "$DISTRO_NAME/conf/"* "$ZOO_CONF_DIR" \ && rm -r "$GNUPGHOME" "$DISTRO_NAME.tar.gz" "$DISTRO_NAME.tar.gz.asc" \ && apk del .build-deps WORKDIR $DISTRO_NAME VOLUME ["$ZOO_DATA_DIR", "$ZOO_DATA_LOG_DIR"] EXPOSE $ZOO_PORT 2888 3888 ENV PATH=$PATH:/$DISTRO_NAME/bin \ ZOOCFGDIR=$ZOO_CONF_DIR COPY docker-entrypoint.sh / ENTRYPOINT ["/docker-entrypoint.sh"] CMD ["zkServer.sh", "start-foreground"] Below is the error I got:
Step 4 : ENV JAVA_HOME /usr/lib/jvm/java-7-openjdk-amd64 ---> Running in a49507cb9725 ---> 77b37883caf4 Removing intermediate container a49507cb9725 Step 5 : RUN apk add --no-cache bash su-exec ---> Running in a4fd76a644cf /bin/sh: 1: apk: not found The command '/bin/sh -c apk add --no-cache bash su-exec' returned a non-zero code: 127 Am I doing anything wrong here? Why is apk not found?
2 Answers
As larsks mentions, apk is for Alpine distributions and you selected FROM ubuntu:trusty which is Debian based with the apt-get command. Change your FROM line to FROM alpine:3.4 to switch to the Alpine based image with apk support.
Quite late to the party. I'll put down what worked for me.
As john rightly pointed out that apk is package manager for alpine distributions, for ubuntu image, we need to use apt-get:
FROM ubuntu:trusty RUN apt-get update && apt-get install -y tini Otherwise Alpine base image can be used to run apk commands:
FROM python:3.7-alpine3.12 RUN apk add --no-cache tini 
