CODEWITHSUNDEEP
dockerdockerfile
ashok
ashok

Reputation: 1

how to change container hostname when using entrypoint script?

Trying to change the hostname of container with export HOSTNAME=somehost from entrypoint.sh script but its not chaging

Attaching my current dockerfile and entrypoint.sh files Dockerfile:

FROM ubuntu:latest
RUN apt-get update && apt-get -y upgrade && DEBIAN_FRONTEND=noninteractive apt-get -y install \
    apache2 \
    dos2unix
WORKDIR /etc/
RUN mkdir Docker2
COPY entrypoint.sh /etc/Docker2/
WORKDIR /etc/Docker2
RUN chmod +x entrypoint.sh
RUN dos2unix entrypoint.sh
EXPOSE 80
ENTRYPOINT ["/etc/Docker2/entrypoint.sh"]

entrypoint.sh:

#!/bin/sh
set -e
export HOSTNAME=somehost
exec "$@"
cd /usr/sbin && ./apache2ctl -D FOREGROUND

Upvotes: 0

Views: 1764

Answers (2)

MrKulli
MrKulli

Reputation: 769

edit /etc/hostname file inside the container from entrypoint.sh on startup.

echo some.host.name > /etc/hostname

Otherwise, you have to run the container with -h or --hostname option.

Upvotes: 0

menya
menya

Reputation: 1525

I think env HOSTNAME only works in shell situation. Docker has provided another way to custom hostname: 

docker run --hostname <name> image:tag

Upvotes: 1

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