Ionic serve hot reload with docker not working - docker

Question

I had an ionic app which I have dockerized. The build and up commands are successful and I can access the app at http://localhost:8100. However, hot reload doesn't work. Whenever I edit some file, those changes are nor reflected until redo an ionic serve, but if I rename some file inside the container, the ionic rebuild the app automatically.
Dockerfile
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractiv \
TERM=xterm \
# https://cordova.apache.org/docs/en/8.x/guide/platforms/android/#installing-the-requirements
JAVA_VERSION=8 \
# https://github.com/gradle/gradle/releases
GRADLE_VERSION=5.2.1 \
# https://developer.android.com/studio/releases/sdk-tools V26.1.1
ANDROID_SDK_URL="https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip" \
# https://developer.android.com/studio/releases/build-tools
ANDROID_BUILD_TOOLS_VERSION=28.0.3 \
# https://source.android.com/setup/start/build-numbers
ANDROID_APIS="android-28" \
ANDROID_HOME="/opt/android" \
# https://nodejs.org/en/
NODE_VERSION=11.10.0 \
# https://www.npmjs.com/package/cordova
CORDOVA_VERSION=8.1.2 \
# https://www.npmjs.com/package/ionic
IONIC_VERSION=4.10.3
# dependences
WORKDIR /tmp
RUN mkdir /app && \
buildDeps='software-properties-common'; \
set -x && \
dpkg --add-architecture i386 && \
apt-get -qq update && \
apt-get -qq install -y $buildDeps curl git ca-certificates bzip2 openssh-client unzip wget libncurses5:i386 libstdc++6:i386 zlib1g:i386 --no-install-recommends
# java # use WebUpd8 PPA
RUN add-apt-repository ppa:webupd8team/java -y && \
apt-get -qq update -y && \
# automatically accept the Oracle license
echo oracle-java"$JAVA_VERSION"-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections && \
apt-get -qq install -y oracle-java"$JAVA_VERSION"-installer oracle-java"$JAVA_VERSION"-set-default
ENV JAVA_HOME=/usr/lib/jvm/java-"$JAVA_VERSION"-oracle
# gradle
RUN wget https://services.gradle.org/distributions/gradle-"$GRADLE_VERSION"-bin.zip && \
mkdir /opt/gradle && \
unzip -d /opt/gradle gradle-"$GRADLE_VERSION"-bin.zip
ENV PATH=$PATH:/opt/gradle/gradle-"$GRADLE_VERSION"/bin
# android
WORKDIR /opt/android
ENV PATH $PATH:"$ANDROID_HOME"/platform-tools:"$ANDROID_HOME"/tools:"$ANDROID_HOME"/build-tools/"$ANDROID_BUILD_TOOLS_VERSION"
RUN wget -O tools.zip "$ANDROID_SDK_URL" && \
unzip tools.zip && \
rm tools.zip && \
# echo y | android update sdk -a -u -t platform-tools,"$ANDROID_APIS",build-tools-"$ANDROID_BUILD_TOOLS_VERSION" && \
yes Y | "$ANDROID_HOME"/tools/bin/sdkmanager "build-tools;$ANDROID_BUILD_TOOLS_VERSION" "platforms;$ANDROID_APIS" "platform-tools" && \
chmod a+x -R "$ANDROID_HOME" && \
chown -R root:root "$ANDROID_HOME"
# node
WORKDIR /opt/node
RUN curl -sL https://nodejs.org/dist/v"$NODE_VERSION"/node-v"$NODE_VERSION"-linux-x64.tar.gz | tar xz --strip-components=1
ENV PATH=$PATH:/opt/node/bin
# ionic & cordova
WORKDIR /tmp
RUN npm i -g ionic#"$IONIC_VERSION" cordova#"$CORDOVA_VERSION" && \
ionic config set -g daemon.updates false && \
cordova telemetry off
# clean up
RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
apt-get purge -y --auto-remove $buildDeps && \
apt-get autoremove -y && \
apt-get clean
# app
WORKDIR /app
EXPOSE 8100 35729
docker-compose
version: '3'
networks:
default:
driver: bridge
ipam:
config:
- subnet: 172.18.19.0/24
services:
ionic:
container_name: Ionic
image: ionic
restart: 'no'
networks:
default:
ports:
- "8100:8100"
- "35729:35729"
volumes:
- w:\projects\test:/app
command: "ionic serve"
Is the problem something I did? or will it be a docker / ionic bug?

Answer 1

I found this on github. you can try to put this in /etc/sysctl.conf
fs.inotify.max_user_watches=524288
and then reboot or
sudo sysctl --system