ubuntu -/bin/sh : 1: apk: not found while creating docker image

Question

我有下面的 Zookeeper Dockerfile，我正在尝试为它创建一个图像，但它给了我一个错误。我最近开始使用 Docker，并开始使用 Zookeeper 设置，所以我无法理解。这个错误是什么意思？

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 "http://www.apache.org/dist/zookeeper/$DISTRO_NAME/$DISTRO_NAME.tar.gz" \
    && wget -q "http://www.apache.org/dist/zookeeper/$DISTRO_NAME/$DISTRO_NAME.tar.gz.asc" \
    && 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"]

以下是我得到的错误:

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

我在这里做错了吗？为什么找不到apk？

Answer 1

作为 larsks mentions , apk 适用于 Alpine 发行版，您选择了基于 Debian 的 FROM ubuntu:trusty 使用 apt-get 命令。将您的 FROM 行更改为 FROM alpine:3.4 以切换到支持 apk 的基于 Alpine 的镜像。