How to speed up running docker-container with node.js? - node.js

Question

I develop application with node.js and docker. My deploy process includes few steps:
build docker-image
run docker-container
I have 19 seconds to running of my node_js container. But i want to reduce the time to 1-5 seconds at least.
Most of run container time it takes npm install.
It is possible to speed up running my node.js application?
Dockerfile
FROM ubuntu:14.04
MAINTAINER Vovan
# docker build --build-arg NODE_VERSION=any_version .
ARG NODE_VERSION=4.4.2
ARG EXTERNAL_GIT_URI=local_gitlab
ARG EXTERNAL_GIT_PORT=22
# variables
ENV TERM=xterm
# use bash instead of sh
RUN rm /bin/sh && ln -s /bin/bash /bin/sh
# essential system updates and soft
RUN apt-get update -qq \
&& apt-get install -yq \
ntp \
build-essential \
curl \
mc \
nano \
git \
&& curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash \
# add nvm as term command
&& . ~/.nvm/nvm.sh \
#
&& nvm install ${NODE_VERSION} \
&& nvm alias default ${NODE_VERSION}
# home directory
RUN useradd -m -d /home/app -s /bin/bash app -u9999
# copy keys in image
ADD for_gitlab /root/.ssh/for_gitlab
ADD config /root/.ssh/config
RUN chmod 600 /root/.ssh/* \
&& ssh-keyscan -p ${EXTERNAL_GIT_PORT} ${EXTERNAL_GIT_URI} > /root/.ssh/known_hosts
# copy script and make it executable
WORKDIR /
RUN mkdir config
ADD starter.sh /config
CMD ["/config/starter.sh"]
RUN chmod +x /config/starter.sh
WORKDIR /home/app
starter.sh
APP_DIR=/home/app/${GIT_REPO_NAME}
GIT_CLONE_URI=git#local_gitlab:${GIT_GROUP}/${GIT_REPO_NAME}.git
cd /home/app
git clone ${GIT_CLONE_URI} --depth 1 --branch ${GIT_REPO_BRANCH}
# permissions
find ${APP_DIR} -type f -exec chmod 644 {} \;
find ${APP_DIR} -type d -exec chmod 755 {} \;
chown -R app:app ${APP_DIR}
#
. ~/.nvm/nvm.sh
nvm use default
cd ${APP_DIR} && npm install
find ${APP_DIR}/node_modules -type f -exec chmod 644 {} \;
find ${APP_DIR}/node_modules -type d -exec chmod 755 {} \;
node ${SCRIPT}

Answer 1

You can conditinally run npm install by checking if package.json has been modified since the last the installation. Here I'm checking if package.json modified time is newer than node_modules modified time :
[ package.json -nt node_modules ] && npm install ;