While running docker image, I am receiving the following error:
/entrypoint.sh: line 7: USER: unbound variable
Code of entrypoint.sh.
#!/bin/bash
set -euo pipefail
export SPARK_DIST_CLASSPATH=$(hadoop classpath)
POSTGRES_TIMEOUT=60
echo "Running as: ${USER}"
if [ "${USER}" != "root" ]; then
echo "Changing owner of files in ${AIRFLOW_HOME} to ${USER}"
chown -R "${USER}" ${AIRFLOW_HOME}
fi
set +e
Declaration of Environment variable user in Docker File:
# Delay creation of user and group
ONBUILD ARG THEUSER=afpuser
ONBUILD ARG THEGROUP=hadoop
ONBUILD ENV USER ${THEUSER}
ONBUILD ENV GROUP ${THEGROUP}
ONBUILD RUN groupadd -r "${GROUP}" && useradd -rmg "${GROUP}" "${USER}"
Full code of Docker image is present in the Link
Related
I'm using this container to set up X11 in GitPod.
ARG base
FROM ${base}
# Dazzle does not rebuild a layer until one of its lines are changed. Increase this counter to rebuild this layer.
ENV TRIGGER_REBUILD=1
# Install Xvfb, JavaFX-helpers and Openbox window manager
RUN sudo install-packages xvfb x11vnc xterm openjfx libopenjfx-java openbox
# Overwrite this env variable to use a different window manager
ENV WINDOW_MANAGER="openbox"
USER root
# Change the default number of virtual desktops from 4 to 1 (footgun)
RUN sed -ri "s/<number>4<\/number>/<number>1<\/number>/" /etc/xdg/openbox/rc.xml
# Install novnc
RUN git clone --depth 1 https://github.com/novnc/noVNC.git /opt/novnc \
&& git clone --depth 1 https://github.com/novnc/websockify /opt/novnc/utils/websockify
COPY novnc-index.html /opt/novnc/index.html
# Add VNC startup script
COPY start-vnc-session.sh /usr/bin/
RUN chmod +x /usr/bin/start-vnc-session.sh
USER gitpod
# This is a bit of a hack. At the moment we have no means of starting background
# tasks from a Dockerfile. This workaround checks, on each bashrc eval, if the X
# server is running on screen 0, and if not starts Xvfb, x11vnc and novnc.
RUN echo "export DISPLAY=:0" >> /home/gitpod/.bashrc.d/300-vnc
RUN echo "[ ! -e /tmp/.X0-lock ] && (/usr/bin/start-vnc-session.sh &> /tmp/display-\${DISPLAY}.log)" >> /home/gitpod/.bashrc.d/300-vnc
USER root
### checks ###
# no root-owned files in the home directory
RUN notOwnedFile=$(find . -not "(" -user gitpod -and -group gitpod ")" -print -quit) \
&& { [ -z "$notOwnedFile" ] \
|| { echo "Error: not all files/dirs in $HOME are owned by 'gitpod' user & group"; exit 1; } }
USER gitpod
This is where it gets sketchy :
# Install novnc
RUN git clone --depth 1 https://github.com/novnc/noVNC.git /opt/novnc \
&& git clone --depth 1 https://github.com/novnc/websockify /opt/novnc/utils/websockify
COPY novnc-index.html /opt/novnc/index.html
I get this output please help !
COPY failed: file not found in build context or excluded by .dockerignore: stat novnc-index.html: file does not exist
Knowing that my dockerfile is in /src and i'm building in /src . I tried to rebuild with the --no-cache flag and use export DOCKER_BUILDKIT=1 . But still I'm stuck with this problem .
How can I put the following into Dockerfile? I'm rebuilding a image and have modified few things.
Upon inspecting the original image, I see that it has CMD in a weird format.
"Cmd": [
"/bin/sh",
"-c",
"#(nop) CMD [\"supervisord\" \"-c\" \"/etc/supervisor.conf\"]"
],
The Entrypoint script executes this as its argument. But I'm unsure how to add this in the new Dockerfile.
I'm not sure if I can have 2 CMD and not sure how to add the nohup in a Dockerfile
ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
CMD ["/bin/sh", "-c", "#(nop)"]
CMD ["supervisord","-c", "/etc/supervisor.conf"]
Here is the entrypoint.sh
#!/bin/bash
set -eo pipefail
# if command starts with an option, prepend supervisord
if [ "${1:0:1}" = '-' ]; then
set -- supervisord "$#"
fi
# Add local user;
# Either use the MARADNS_USER_ID if passed in at runtime or fallback.
USER_ID=${MARADNS_USER_ID:-9001}
echo "Starting with UID : $USER_ID"
usermod -u $USER_ID maradns
# update permissions
chown -R maradns.maradns /etc/maradns
chown -R maradns.maradns /var/cache/deadwood
# replace the UID and GID of the maradns user
MARADNS_UID=`id -u maradns`
MARADNS_GID=`id -g maradns`
cp /etc/mararc.custom /etc/mararc
sed -i -r "s/(maradns_uid\s*=\s*)([0-9]+)(.*)/\1${MARADNS_UID}\3/" /etc/mararc
sed -i -r "s/(maradns_gid\s*=\s*)([0-9]+)(.*)/\1${MARADNS_GID}\3/" /etc/mararc
# bind maradns on container host
MARADNS_ADDRESS=`ifconfig eth0 | grep 'inet addr:' | cut -d ' ' -f12 | cut -d ':' -f2`
sed -i -r "s/(ipv4_bind_addresses\s*=\s*)(.*)(.*)/\1\"${MARADNS_ADDRESS}\"\3/" /etc/mararc
# copy filebeat configuration
cp /etc/filebeat/filebeat.yml.custom /etc/filebeat/filebeat.yml
# run command
exec "$#"
Can ADD command be customised to work with command line argument.
Basically i have different versions of a file let's say file1 and file2, and based on some condition passed through command line.
The following command works correctly and transfers the file from host to docker, but i didn't find any references to do it conditionally.
ADD target/file.yml file.yml
No, ADD does not support the conditional way of copying files.
But there is a way to deal with such configuration while coping from Host.
Copy all configuration to some temp location in your case copy all file1 file2 to some /temp location, then base on ARG pass to docker build, move the file to target.
Or do the above using docker entrypoint based on ENV, instead of base on ARG
FROM alpine
ADD target/ /temp_target
RUN mkdir /target
#filename to be copied to the target
ARG file_name
# pass update_file true or false if true file wil be update to new that is passed to build-args
ARG update_file
ENV file_name=$file_name
ARG update_file=$update_file
#check if update_file is set and its value is true then copy the file from temp to target, else copy file1 to target
RUN if [ ! -z "$update_file" ] && [ "${update_file}" == true ];then \
echo "$update_file"; \
echo "echo file in temp_target"; \
ls /temp_target ;\
echo "updating file target" ;\
cp /temp_target/"${file_name}" /target/ ; \
echo "list of updated files in target"; \
ls /target ; \
else \
echo "copy with default file that is ${file_name}" ;\
cp /temp_target/file1 /target ;\
fi
Build:
This will not updated file, will copy with default filename that is file1
docker build --no-cache --build-arg file_name=file1 --build-arg update_file=false -t abc .
This will update file in the target, so the new file will be in the target is file2.
docker build --no-cache --build-arg file_name=file2 --build-arg update_file=true -t abc .
I am running the following Docker container from these Dockerfiles:
FROM debian:wheezy
MAINTAINER authors "authors#gm.com"
RUN groupadd -r -g 2200 example && \
useradd -rM -g example -u 2200 example
ENV APPROOT="/app" \
APP="mailer.sh" \
VERSION="0.6"
LABEL base.name="Mailer Archetype" \
base.version="${VERSION}"
WORKDIR $APPROOT
ADD . $APPROOT
ENTRYPOINT ["/app/mailer.sh"]
EXPOSE 33333
and
FROM dockerinaction/mailer-base:0.6
COPY ["./log-impl", "${APPROOT}"]
RUN chmod a+x ${APPROOT}/${APP} && \
chown example:example /var/log
USER example:example
VOLUME ["/var/log"]
CMD ["/var/log/mailer.log"]
where the mailer.sh is:
#!/bin/sh
printf "Logging Mailer has started.\n"
while true
do
MESSAGE=$(nc -l -p 33333)
printf "[Message]: %s\n" "$MESSAGE" > $1
sleep 1
done
All starts. But I want to test it. So i tried:
from the host to run "nc 33333" -> nothing happens!
to attach to the container: "docker exec -it /bin/bash" but then it does not recognize basic commands like "ps", "vi", "nc"...
So I am afraid my script is just not running.
Why is that?
thanks
Say I have this:
ARG my_user="root" # my_user => default is "root"
USER $my_user
ENV USER=$my_user
All good so far, but now we get here:
ENV HOME="/root"
is there a way to do something like this:
ENV HOME $my_user === "root"? "/root" : "/home/$my_user"
Obviously, that's the wrong syntax.
The only solution I can think of is to just use two --build-args, something like this:
docker build -t zoom \
--build-arg my_user="foo" \
--build-arg my_home="/home/foo" \
.
Unfortunately you can't do this directly
https://forums.docker.com/t/how-do-i-send-runs-output-to-env-in-dockerfile/16106/3
So you have two alternatives
Use a shell script at start
You can use a shell script at the start
CMD /start.sh
And in your start.sh you can have that logic
if [ $X == "Y" ]; then
export X=Y
else
export X=Z
fi
Create a profile environment variable
FROM alpine
RUN echo "export NAME=TARUN" > /etc/profile.d/myenv.sh
SHELL ["/bin/sh", "-lc"]
CMD env
And then you when you run it
$ docker run test
HOSTNAME=d98d44fa1dc9
SHLVL=1
HOME=/root
PAGER=less
PS1=\h:\w\$
NAME=TARUN
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
CHARSET=UTF-8
Note: The SHELL ["/bin/sh", "-lc"] is quite important here, else the profile will not be loaded
Note2: Instead of RUN echo "export NAME=TARUN" > /etc/profile.d/myenv.sh you can also do a COPY myevn.sh /etc/profile.d/myenv.sh and have the file be present in your build context