Docker Problem, entrypoint file.sh doesnt recognize the su-exec command

Question

I am trying to build a docker image that has elastic search running and creating a container from that image.

Below is the content of my Dockerfile:

FROM adoptopenjdk/openjdk8:alpine

MAINTAINER rando

COPY  elasticsearch-2.1.1.tar.gz /tmp

RUN    cd /tmp  \
    && tar -xzf  elasticsearch-2.1.1.tar.gz  \ 
    && ls    \
    && mv elasticsearch-2.1.1   /usr/share/elasticsearch   \
    && ls /usr/share \
       && adduser -DH -s /sbin/nologin elasticsearch \
       && chown -R elasticsearch:elasticsearch /usr/share/elasticsearch \
       && echo "Creating Elasticsearch Paths..." \
       && for path in /usr/share/elasticsearch/data /usr/share/elasticsearch/logs /usr/share/elasticsearch/config /usr/share/elasticsearch/config/scripts /usr/share/elasticsearch/plugins ; do mkdir -p "$path"; done \
       && chown -R elasticsearch:elasticsearch /usr/share/elasticsearch \
       && ls /usr/share/elasticsearch 

COPY elasticsearch.yml  /usr/share/elasticsearch/config
COPY elastic-entrypoint.sh /
RUN chmod +x /elastic-entrypoint.sh 

ENV  ES_HOME=/usr/share/elasticsearch   
ENV  PATH=${ES_HOME}/bin:${PATH}

RUN echo "$PATH"

VOLUME ["/usr/share/elasticsearch/data"]

EXPOSE 9200 9300

ENTRYPOINT ["/elastic-entrypoint.sh"]

CMD ["elasticsearch"]

I am to build successfully the image from the docker file when running the command below:

docker build -t elasticsearch .

When I try to create the container with the command below, I am facing some issues:

docker run -d --network host elasticsearch

The container is created but is terminates directly.

Below is the content when running the docker logs for the container:

/elastic-entrypoint.sh: exec: line 20: su-exec: not found

Below is the content of elastic-entrypoint.sh file:

#!/bin/sh

set -e

# Add elasticsearch as command if needed
if [ "${1:0:1}" = '-' ]; then
    set -- elasticsearch "$@"
fi

# Drop root privileges if we are running elasticsearch
# allow the container to be started with `--user`
if [ "$1" = 'elasticsearch' -a "$(id -u)" = '0' ]; then
    # Change the ownership of /usr/share/elasticsearch/data to elasticsearch
    chown -R elasticsearch:elasticsearch /usr/share/elasticsearch/data

    set -- su-exec elasticsearch tini -- "$@"
fi


exec "$@"

It seems that set -- su-exec elasticsearch tini -- "$@" is not working.

I will appreciate any help or guidance to fix this issue.

Regards, Rando.

Update............................................................

I modified the file as below:

    #set -- su-exec elasticsearch tini -- "$@"
    set -- su -c elasticsearch tini -- "$@"

It showed the error:

su: unknown user tini

It is not recognizing the user.

Update 2...............................................................

I modified the dockerfile by adding the command for installation of su-exe like below:

# Install required packages
RUN apk add --no-cache bash su-exec

The container exited with the error below:

su-exec: tini: No such file or directory

Answer 1

Try to use set -- su -c elasticsearch tini -- "$@"

Also you do not need to define CMD ["elasticsearch"] inside Dockerfile. Just put inside elastic-entrypoint.sh file.

Answer 2

The cause of the error was that adoptopenjdk/openjdk8:alpine does not include the su-exec package. I modified the dockerfile as below:

FROM adoptopenjdk/openjdk8:alpine

MAINTAINER rando

# Install required packages
RUN apk add --no-cache bash su-exec
RUN apk add --update tini

COPY  elasticsearch-2.1.1.tar.gz /tmp

...

And adding su-exec package fixed the issue in my case.