I have a base Docker image:
FROM ubuntu:21.04
WORKDIR /app
RUN apt-get update && apt-get install -y wget bzip2 \
&& wget -qO- https://micromamba.snakepit.net/api/micromamba/linux-64/latest | tar -xvj bin/micromamba \
&& touch /root/.bashrc \
&& ./bin/micromamba shell init -s bash -p /opt/conda \
&& cp /root/.bashrc /opt/conda/bashrc \
&& apt-get clean autoremove --yes \
&& rm -rf /var/lib/{apt,dpkg,cache,log}
SHELL ["bash", "-l" ,"-c"]
and derive from it another one:
ARG BASE
FROM $BASE
RUN source /opt/conda/bashrc && micromamba activate \
&& micromamba create --file environment.yaml -p /env
While building the second image I get the following error: micromamba: command not found for the RUN section.
If I run 1st base image manually I can launch micromamba, it is running correctly
I can run temporary image which were created for 2nd image building, micromamba is available via CLI, running correctly.
If I inherit from debian:buster, or alpine, for example, it is building perfectly.
What a problem with the Ubuntu? Why it cannot see micromamba during 2nd Docker image building?
PS using scaffold for building, so it can understand correctly, where is $BASE and what is it.
The ubuntu:21.04 image comes with a /root/.bashrc file that begins with:
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples
# If not running interactively, don't do anything
[ -z "$PS1" ] && return
When the second Dockerfile executes RUN source /opt/conda/bashrc, PS1 is not set and thus the remainder of the bashrc file does not execute. The remainder of the bashrc file is where micromamba initialization occurs, including the setup of the micromamba bash function that is used to activate a micromamba environment.
The debian:buster image has a smaller /root/.bashrc that does not have a line similar to [ -z "$PS1" ] && return and therefore the micromamba function gets loaded.
The alpine image does not come with a /root/.bashrc so it also does not contain the code to exit the file early.
If you want to use the ubuntu:21.04 image, you could modify you first Dockerfile like this:
FROM ubuntu:21.04
WORKDIR /app
RUN apt-get update && apt-get install -y wget bzip2 \
&& wget -qO- https://micromamba.snakepit.net/api/micromamba/linux-64/latest | tar -xvj bin/micromamba \
&& touch /root/.bashrc \
&& ./bin/micromamba shell init -s bash -p /opt/conda \
&& grep -v '[ -z "\$PS1" ] && return' /root/.bashrc > /opt/conda/bashrc # this line has been modified \
&& apt-get clean autoremove --yes \
&& rm -rf /var/lib/{apt,dpkg,cache,log}
SHELL ["bash", "-l" ,"-c"]
This will strip out the one line that causes the early termination.
Alternatively, you could make use of the existing mambaorg/micromamba docker image. The mambaorg/micromamba:latest is based on debian:slim, but mambaorg/micromamba:jammy will get you a ubuntu-based image (disclosure: I maintain this image).
Is it possible to generate a Dockerfile from an image? I want to know for two reasons:
I can download images from the repository but would like to see the recipe that generated them.
I like the idea of saving snapshots, but once I am done it would be nice to have a structured format to review what was done.
How to generate or reverse a Dockerfile from an image?
You can. Mostly.
Notes: It does not generate a Dockerfile that you can use directly with docker build; the output is just for your reference.
alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm alpine/dfimage"
dfimage -sV=1.36 nginx:latest
It will pull the target docker image automatically and export Dockerfile. Parameter -sV=1.36 is not always required.
Reference: https://hub.docker.com/r/alpine/dfimage
Now hub.docker.com shows the image layers with detail commands directly, if you choose a particular tag.
Bonus
If you want to know which files are changed in each layer
alias dive="docker run -ti --rm -v /var/run/docker.sock:/var/run/docker.sock wagoodman/dive"
dive nginx:latest
On the left, you see each layer's command, on the right (jump with tab), the yellow line is the folder that some files are changed in that layer
(Use SPACE to collapse dir)
Old answer
below is the old answer, it doesn't work any more.
$ docker pull centurylink/dockerfile-from-image
$ alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm centurylink/dockerfile-from-image"
$ dfimage --help
Usage: dockerfile-from-image.rb [options] <image_id>
-f, --full-tree Generate Dockerfile for all parent layers
-h, --help Show this message
To understand how a docker image was built, use the
docker history --no-trunc command.
You can build a docker file from an image, but it will not contain everything you would want to fully understand how the image was generated. Reasonably what you can extract is the MAINTAINER, ENV, EXPOSE, VOLUME, WORKDIR, ENTRYPOINT, CMD, and ONBUILD parts of the dockerfile.
The following script should work for you:
#!/bin/bash
docker history --no-trunc "$1" | \
sed -n -e 's,.*/bin/sh -c #(nop) \(MAINTAINER .*[^ ]\) *0 B,\1,p' | \
head -1
docker inspect --format='{{range $e := .Config.Env}}
ENV {{$e}}
{{end}}{{range $e,$v := .Config.ExposedPorts}}
EXPOSE {{$e}}
{{end}}{{range $e,$v := .Config.Volumes}}
VOLUME {{$e}}
{{end}}{{with .Config.User}}USER {{.}}{{end}}
{{with .Config.WorkingDir}}WORKDIR {{.}}{{end}}
{{with .Config.Entrypoint}}ENTRYPOINT {{json .}}{{end}}
{{with .Config.Cmd}}CMD {{json .}}{{end}}
{{with .Config.OnBuild}}ONBUILD {{json .}}{{end}}' "$1"
I use this as part of a script to rebuild running containers as images:
https://github.com/docbill/docker-scripts/blob/master/docker-rebase
The Dockerfile is mainly useful if you want to be able to repackage an image.
The thing to keep in mind, is a docker image can actually just be the tar backup of a real or virtual machine. I have made several docker images this way. Even the build history shows me importing a huge tar file as the first step in creating the image...
I somehow absolutely missed the actual command in the accepted answer, so here it is again, bit more visible in its own paragraph, to see how many people are like me
$ docker history --no-trunc <IMAGE_ID>
A bash solution :
docker history --no-trunc $argv | tac | tr -s ' ' | cut -d " " -f 5- | sed 's,^/bin/sh -c #(nop) ,,g' | sed 's,^/bin/sh -c,RUN,g' | sed 's, && ,\n & ,g' | sed 's,\s*[0-9]*[\.]*[0-9]*\s*[kMG]*B\s*$,,g' | head -n -1
Step by step explanations:
tac : reverse the file
tr -s ' ' trim multiple whitespaces into 1
cut -d " " -f 5- remove the first fields (until X months/years ago)
sed 's,^/bin/sh -c #(nop) ,,g' remove /bin/sh calls for ENV,LABEL...
sed 's,^/bin/sh -c,RUN,g' remove /bin/sh calls for RUN
sed 's, && ,\n & ,g' pretty print multi command lines following Docker best practices
sed 's,\s*[0-9]*[\.]*[0-9]*\s*[kMG]*B\s*$,,g' remove layer size information
head -n -1 remove last line ("SIZE COMMENT" in this case)
Example:
~ dih ubuntu:18.04
ADD file:28c0771e44ff530dba3f237024acc38e8ec9293d60f0e44c8c78536c12f13a0b in /
RUN set -xe
&& echo '#!/bin/sh' > /usr/sbin/policy-rc.d
&& echo 'exit 101' >> /usr/sbin/policy-rc.d
&& chmod +x /usr/sbin/policy-rc.d
&& dpkg-divert --local --rename --add /sbin/initctl
&& cp -a /usr/sbin/policy-rc.d /sbin/initctl
&& sed -i 's/^exit.*/exit 0/' /sbin/initctl
&& echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup
&& echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean
&& echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean
&& echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean
&& echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages
&& echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes
&& echo 'Apt::AutoRemove::SuggestsImportant "false";' > /etc/apt/apt.conf.d/docker-autoremove-suggests
RUN rm -rf /var/lib/apt/lists/*
RUN sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list
RUN mkdir -p /run/systemd
&& echo 'docker' > /run/systemd/container
CMD ["/bin/bash"]
Update Dec 2018 to BMW's answer
chenzj/dfimage - as described on hub.docker.com regenerates Dockerfile from other images. So you can use it as follows:
docker pull chenzj/dfimage
alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm chenzj/dfimage"
dfimage IMAGE_ID > Dockerfile
This is derived from #fallino's answer, with some adjustments and simplifications by using the output format option for docker history. Since macOS and Gnu/Linux have different command-line utilities, a different version is necessary for Mac. If you only need one or the other, you can just use those lines.
#!/bin/bash
case "$OSTYPE" in
linux*)
docker history --no-trunc --format "{{.CreatedBy}}" $1 | # extract information from layers
tac | # reverse the file
sed 's,^\(|3.*\)\?/bin/\(ba\)\?sh -c,RUN,' | # change /bin/(ba)?sh calls to RUN
sed 's,^RUN #(nop) *,,' | # remove RUN #(nop) calls for ENV,LABEL...
sed 's, *&& *, \\\n \&\& ,g' # pretty print multi command lines following Docker best practices
;;
darwin*)
docker history --no-trunc --format "{{.CreatedBy}}" $1 | # extract information from layers
tail -r | # reverse the file
sed -E 's,^(\|3.*)?/bin/(ba)?sh -c,RUN,' | # change /bin/(ba)?sh calls to RUN
sed 's,^RUN #(nop) *,,' | # remove RUN #(nop) calls for ENV,LABEL...
sed $'s, *&& *, \\\ \\\n \&\& ,g' # pretty print multi command lines following Docker best practices
;;
*)
echo "unknown OSTYPE: $OSTYPE"
;;
esac
It is not possible at this point (unless the author of the image explicitly included the Dockerfile).
However, it is definitely something useful! There are two things that will help to obtain this feature.
Trusted builds (detailed in this docker-dev discussion
More detailed metadata in the successive images produced by the build process. In the long run, the metadata should indicate which build command produced the image, which means that it will be possible to reconstruct the Dockerfile from a sequence of images.
If you are interested in an image that is in the Docker hub registry and wanted to take a look at Dockerfile?.
Example:
If you want to see the Dockerfile of image "jupyter/datascience-notebook" type the word "Dockerfile" in the address bar of your browser as shown below.
https://hub.docker.com/r/jupyter/datascience-notebook/
https://hub.docker.com/r/jupyter/datascience-notebook/Dockerfile
Note:
Not all the images have Dockerfile, for example, https://hub.docker.com/r/redislabs/redisinsight/Dockerfile
Sometimes this way is much faster than searching for Dockerfile in Github.
docker pull chenzj/dfimage
alias dfimage="docker run -v /var/run/docker.sock:/var/run/docker.sock --rm chenzj/dfimage"
dfimage image_id
Below is the output of the dfimage command:
$ dfimage 0f1947a021ce
FROM node:8
WORKDIR /usr/src/app
COPY file:e76d2e84545dedbe901b7b7b0c8d2c9733baa07cc821054efec48f623e29218c in ./
RUN /bin/sh -c npm install
COPY dir:a89a4894689a38cbf3895fdc0870878272bb9e09268149a87a6974a274b2184a in .
EXPOSE 8080
CMD ["npm" "start"]
it is possible in just two step. First pull the image then run docker history command. also, shown in SS.
docker pull kalilinux/kali-rolling
docker history --format "{{.CreatedBy}}" kalilinux/kali-rolling --no-trunc
What is image2df
image2df is tool for Generate Dockerfile by an image.
This tool is very useful when you only have docker image and need to generate a Dockerfile whit it.
How does it work
Reverse parsing by history information of an image.
How to use this image
# Command alias
echo "alias image2df='docker run -v /var/run/docker.sock:/var/run/docker.sock --rm cucker/image2df'" >> ~/.bashrc
. ~/.bashrc
# Excute command
image2df <IMAGE>
See help
docker run --rm cucker/image2df --help
For example
$ echo "alias image2df='docker run -v /var/run/docker.sock:/var/run/docker.sock --rm cucker/image2df'" >> ~/.bashrc
$ . ~/.bashrc
$ docker pull mysql
$ image2df mysql
========== Dockerfile ==========
FROM mysql:latest
RUN groupadd -r mysql && useradd -r -g mysql mysql
RUN apt-get update && apt-get install -y --no-install-recommends gnupg dirmngr && rm -rf /var/lib/apt/lists/*
ENV GOSU_VERSION=1.12
RUN set -eux; \
savedAptMark="$(apt-mark showmanual)"; \
apt-get update; \
apt-get install -y --no-install-recommends ca-certificates wget; \
rm -rf /var/lib/apt/lists/*; \
dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
export GNUPGHOME="$(mktemp -d)"; \
gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
gpgconf --kill all; \
rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
apt-mark auto '.*' > /dev/null; \
[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \
apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
chmod +x /usr/local/bin/gosu; \
gosu --version; \
gosu nobody true
RUN mkdir /docker-entrypoint-initdb.d
RUN apt-get update && apt-get install -y --no-install-recommends \
pwgen \
openssl \
perl \
xz-utils \
&& rm -rf /var/lib/apt/lists/*
RUN set -ex; \
key='A4A9406876FCBD3C456770C88C718D3B5072E1F5'; \
export GNUPGHOME="$(mktemp -d)"; \
gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
gpg --batch --export "$key" > /etc/apt/trusted.gpg.d/mysql.gpg; \
gpgconf --kill all; \
rm -rf "$GNUPGHOME"; \
apt-key list > /dev/null
ENV MYSQL_MAJOR=8.0
ENV MYSQL_VERSION=8.0.24-1debian10
RUN echo 'deb http://repo.mysql.com/apt/debian/ buster mysql-8.0' > /etc/apt/sources.list.d/mysql.list
RUN { \
echo mysql-community-server mysql-community-server/data-dir select ''; \
echo mysql-community-server mysql-community-server/root-pass password ''; \
echo mysql-community-server mysql-community-server/re-root-pass password ''; \
echo mysql-community-server mysql-community-server/remove-test-db select false; \
} | debconf-set-selections \
&& apt-get update \
&& apt-get install -y \
mysql-community-client="${MYSQL_VERSION}" \
mysql-community-server-core="${MYSQL_VERSION}" \
&& rm -rf /var/lib/apt/lists/* \
&& rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql /var/run/mysqld \
&& chown -R mysql:mysql /var/lib/mysql /var/run/mysqld \
&& chmod 1777 /var/run/mysqld /var/lib/mysql
VOLUME [/var/lib/mysql]
COPY dir:2e040acc386ebd23b8571951a51e6cb93647df091bc26159b8c757ef82b3fcda in /etc/mysql/
COPY file:345a22fe55d3e6783a17075612415413487e7dba27fbf1000a67c7870364b739 in /usr/local/bin/
RUN ln -s usr/local/bin/docker-entrypoint.sh /entrypoint.sh # backwards compat
ENTRYPOINT ["docker-entrypoint.sh"]
EXPOSE 3306 33060
CMD ["mysqld"]
reference
I built a docker image using Dockerfile with Python and some libraries inside (no my project code inside). In my local work dir, there are some scripts to be run on the docker. So, here what I did
$ cd /path/to/my_workdir
$ docker run -it --name test -v `pwd`:`pwd` -w `pwd` my/code:test python src/main.py --config=test --results-dir=/home/me/Results
The command python src/main.py --config=test --results-dir=/home/me/Results is what I want to run inside the Docker container.
However, it returns,
/home/docker/miniconda3/bin/python: /home/docker/miniconda3/bin/python: cannot execute binary file
How can I fix it and run my code?
Here is my Dockerfile
FROM nvidia/cuda:10.1-cudnn7-runtime-ubuntu18.04
MAINTAINER Me <me#me.com>
RUN apt update -yq && \
apt install -yq curl wget unzip git vim cmake sudo
RUN adduser --disabled-password --gecos '' docker && \
adduser docker sudo && \
echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
USER docker
WORKDIR /home/docker/
RUN chmod a+rwx /home/docker/ && \
wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh && \
bash Miniconda3-latest-Linux-x86_64.sh -b && rm Miniconda3-latest-Linux-x86_64.sh
ENV PATH /home/docker/miniconda3/bin:$PATH
Run pip install absl-py==0.5.0 atomicwrites==1.2.1 attrs==18.2.0 certifi==2018.8.24 chardet==3.0.4 cycler==0.10.0 docopt==0.6.2 enum34==1.1.6 future==0.16.0 idna==2.7 imageio==2.4.1 jsonpickle==1.2 kiwisolver==1.0.1 matplotlib==3.0.0 mock==2.0.0 more-itertools==4.3.0 mpyq==0.2.5 munch==2.3.2 numpy==1.15.2 pathlib2==2.3.2 pbr==4.3.0 Pillow==5.3.0 pluggy==0.7.1 portpicker==1.2.0 probscale==0.2.3 protobuf==3.6.1 py==1.6.0 pygame==1.9.4 pyparsing==2.2.2 pysc2==3.0.0 pytest==3.8.2 python-dateutil==2.7.3 PyYAML==3.13 requests==2.19.1 s2clientprotocol==4.10.1.75800.0 sacred==0.8.1 scipy==1.1.0 six==1.11.0 sk-video==1.1.10 snakeviz==1.0.0 tensorboard-logger==0.1.0 torch==0.4.1 torchvision==0.2.1 tornado==5.1.1 urllib3==1.23
USER docker
ENTRYPOINT ["/bin/bash"]
Try making the file executable before running it.
as John mentioned to do in the dockerfile
FROM python:latest
COPY src/main.py /usr/local/share/
RUN chmod +x /usr/local/share/src/main.py #<-**--- just add this also
# I have some doubts about the pathing
CMD ["/usr/local/share/src/main.py", "--config=test --results-dir=/home/me/Results"]
You can run a python script in docker by adding this to your docker file:
FROM python:latest
COPY src/main.py /usr/local/share/
CMD ["src/main.py", "--config=test --results-dir=/home/me/Results"]
I have a Dockerfile which was originally pulling from ubuntu and I recently came across alpine which is more lightweight so would like to pull from that instead. Part of the code I'm trying to build is called Healpix which depends on cfitsio. When I originally built the ubuntu version I found this Dockerfile https://github.com/MilesCranmer/dockers/blob/master/dockerfiles/healpix.
Essentially the problem is the following works in ubuntu but not with alpine:
RUN echo "3\ngfortran\n\nY\n\n\ngcc\n\n\n\n\nN\n1\nY\nN\nN\n0\n" |
./configure && make
The error I get is
Something went wrong ...
Quitting configuration script !
./configure: exit: line 162: Illegal number: -1
The command '/bin/sh -c echo "3\ngfortran\n\nY\n\n\ngcc\n\n\n\n\nN\n1\nY\nN\nN\n0\n" | ./configure && make' returned a non-zero code: 2
somewhat confusingly the configure script in question isn't 162 lines long https://sourceforge.net/p/healpix/code/HEAD/tree/branches/branch_v350r1006/configure. I have tried installing bash and changing script to that but that didn't work.
ubuntu Dockerfile
FROM ubuntu
RUN apt-get update && apt-get install -y gcc g++ gfortran make wget
WORKDIR /home
RUN wget \
http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio_latest.tar.gz \
&& tar xzf cfitsio_latest.tar.gz
WORKDIR cfitsio
RUN ./configure --prefix=/usr && make && make install
WORKDIR /home
RUN wget \
https://sourceforge.net/projects/healpix/files/Healpix_3.50/Healpix_3.50_2018Dec10.tar.gz \
&& tar xzf Healpix*.tar.gz
WORKDIR Healpix_3.50
RUN echo \
"3\ngfortran\n\nY\n\n\ngcc\n\n\n\n\nN\n1\nY\nN\nN\n0\n" | ./configure \
&& make
alpine Dockerfile
FROM alpine
RUN apk --no-cache add gcc g++ gfortran make wget
WORKDIR /home
RUN wget \
http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio_latest.tar.gz \
&& tar xzf cfitsio_latest.tar.gz
WORKDIR cfitsio
RUN ./configure --prefix=/usr && make && make install
WORKDIR /home
RUN wget \
https://sourceforge.net/projects/healpix/files/Healpix_3.50/Healpix_3.50_2018Dec10.tar.gz \
&& tar xzf Healpix*.tar.gz
WORKDIR Healpix_3.50
RUN echo \
"3\ngfortran\n\nY\n\n\ngcc\n\n\n\n\nN\n1\nY\nN\nN\n0\n" | ./configure \
&& make
TL;DR
In your Dockerfile, use :
RUN /bin/echo -e "3\ngfortran\n[...]" | ./configure && make
to have the same behavior on Ubuntu and Alpine.
Explanations
The ./configure script is executed with /bin/sh (see the shebang). On Ubuntu, /bin/sh is a link to /bin/dash, while on Alpine, /bin/sh is a link to /bin/busybox.
The following small example reproduces your problem.
Consider the following ./configure script :
#!/bin/sh
read -p "1st prompt : " first
read -p "2nd prompt : " second
echo "$first-$second"
On Ubuntu :
docker run --rm -v $PWD/configure:/configure ubuntu:18.04 \
/bin/sh -c 'echo "a\nb" | ./configure'
prints :
a-b
While, on Alpine :
docker run --rm -v $PWD/configure:/configure alpine:3.8 \
/bin/sh -c 'echo "a\nb" | ./configure'
prints :
anb-
On Alpine (busybox), the echoed string (a\nb) is interpreted as a single argument, while on Ubuntu (dash), the \n is used to separate both arguments.
To have the same behavior as Ubuntu on Alpine, you can run :
docker run --rm -v $PWD/configure:/configure alpine:3.8 /bin/sh -c 'echo "a
b
" | ./configure'
or :
docker run --rm -v $PWD/configure:/configure alpine:3.8 /bin/sh -c \
'echo -e "a\nb" | ./configure'
(see the -e parameter of echo)
These 2 commands print :
a-b
As for your Dockerfile, you should write something like :
RUN /bin/echo -e "3\ngfortran\n[...]" | ./configure && make
/bin/echo is used instead of echo because on Ubuntu, echo -e "3\ngfortran\n[...]" will print -e 3\nngfortran\n[...].
This is because echo is parsed a shell built-in, while /bin/echo is explicitly not (source : https://github.com/moby/moby/issues/8949#issuecomment-61682684).
i write dockfile start zookeeper
FROM buildpack-deps:sid-scm
RUN apt-get update && apt-get install -y --no-install-recommends \
bzip2 \
unzip \
xz-utils \
gettext-base \
&& rm -rf /var/lib/apt/lists/*
COPY zookeeper-3.4.12.tar.gz /opt
COPY config.template.properties /opt
RUN tar xfz /opt/zookeeper-3.4.12.tar.gz -C /opt
ENV ZK_HOME /opt/zookeeper-3.4.12
COPY startzookeeper.sh /opt
RUN chmod a+x /opt/startzookeeper.sh $ZK_HOME
CMD ["/opt/startzookeeper.sh"]
the startzookeeper.sh file is
#!/usr/bin/env bash
eval "cat <<EOF
$(</opt/config.template.properties)
EOF
" | tee /opt/zoo.cfg 2> /dev/null
#echo "$ZK_HOME" > 2.txt
cp /opt/zoo.cfg "$ZK_HOME"/conf
#
exec "$ZK_HOME/bin/zkServer.sh" start
but when i run docker ps,it is empty.
i try add tail -f /dev/null,but it does not work.
i don't know why,the zookeeper should run always,why it exist?
thanks any suggestions.
You could adapt your script to imitate the one from the official zookeeper-docker
(from hub.docker.com)
Its docker-entrypoint.sh ends with exec "$#", which executes "zkServer.sh", "start-foreground".
The important part is the start-foreground option, which ensures the process does not exit immediately, as that would exit your container as well.