Redis – Aws ec2 instance keeps crashing while using docker and gitlab ci cd

I have an aws ec2 micro instance (ubuntu server) with which i host a couple of web apps and an api server. I use docker and gitlab ci cd to deploy the api server written in node. Whenever I try to run build job it crashes and all the hosted applications are not reachable.

The Dockerfile is

FROM node:12.3.1
LABEL maintainer Venkatesh A <[email protected]>
WORKDIR /www/techdoc-api
ARG db_username
ARG db_password
ARG port
ARG jwt_secret
ARG jwt_expiry
ARG link_text
ARG app_link_text
ARG NODE_ENV
ARG redis_host
ARG redis_port
ARG razorpay_id
ARG razorpay_key
RUN npm install pm2 -g
RUN npm install babel-cli -g
RUN apt-get update && apt-get install -y 
  vim
ADD package.json /www/techdoc-api
RUN npm install --production
ADD . /www/techdoc-api
COPY docker-entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/docker-entrypoint.sh
RUN cd /www/techdoc-api
RUN rm -f .env
RUN touch .env
RUN echo "port=$port n
redis_port=$redis_port n
redis_host=$redis_host n
razorpay_id=$razorpay_id n
razorpay_key=$razorpay_key n
db_username=$db_username n
db_password=$db_password n
link_text=$link_text n
app_link_text=$app_link_text n
jwt_secret=$jwt_secret n
jwt_expiry=$jwt_expiry n
NODE_ENV=$NODE_ENV" >> ./.env
EXPOSE 3000
ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]

The docker compose file is as follows:

version: '2.2'
services:
    mysql:
        build: ./config/docker_db_config
        environment:
            - MYSQL_ALLOW_EMPTY_PASSWORD=yes
        healthcheck:
            test: "exit 0"
        restart: always
    redis:
        image: 'redis'
        ports: 
            - "6379:6379"
    api:
        build: .
        depends_on:
            mysql:
                condition: service_healthy
        entrypoint:
            - /usr/local/bin/docker-entrypoint.sh
        restart: always
        ports:
            - "3000:3000"

and the gitlab-ci.yml is as follows…

image: docker:stable

services:
  - docker:dind

stages:
  - build
  - deploy

cache:
  paths:
    - node_modules/

build_app:
  stage: build
  script:
    - docker-compose build mysql
    - docker-compose build redis
    - docker-compose build --build-arg db_username="${db_username}" --build-arg db_password="${db_password}" --build-arg  jwt_secret="${jwt_secret}" --build-arg  NODE_ENV="${NODE_ENV}" --build-arg port="${port}" --build-arg redis_port="${redis_port}" --build-arg redis_host="${redis_host}" --build-arg jwt_expiry="${jwt_expiry}" --build-arg razorpay_key="${razorpay_key}" --build-arg razorpay_id="${razorpay_id}" --build-arg link_text="${link_text}" --build-arg app_link_text="${app_link_text}" api
    - echo "Build successful."
    - docker-compose up -d
    - echo "Deployed!!"  
  only: 
    - master
    

Should I delete the old containers before running new job? Should i cache the node modules somewhere? Should I make sure that I have enough space before I run jobs?

Open to suggestions and changes in the above design.

(Note: By ‘crashing’ I mean that im not able to ssh into the server unless i reboot it and the hosted web apps are unreachable)