MongoDB 4.0 -> 4.2 -> 4.4 and back to 4.0

up_down.sh

#!/bin/bash

pre_clean() {
  printf "\n##### RESETTING DOCKER VOLUME AND CONTAINER... #####\n"
  docker stop mongotest
  docker rm -v mongotest
  sudo rm -rf /tmp/data
}

start_mongo() {
  printf "\n##### STARTING MONGO $1... #####\n"
  docker run --name mongotest -v /tmp/data:/data/db -d mongo:$1
  sleep 5s
}

check_running() {
  printf "\n##### CHECKING MONGO IS RUNNING... #####\n"
  docker exec mongotest mongo --eval "db.stats().ok"
}

print_fcv() {
  printf "\n##### PRINTING FCV... #####\n"
  docker exec mongotest mongo --eval "db.adminCommand({getParameter:1,featureCompatibilityVersion:1})"
}

set_fcv() {
  printf "\n##### SETTING FCV=$1 #####\n"
  docker exec mongotest mongo --eval "db.adminCommand({setFeatureCompatibilityVersion: '$1'})"
}

clean_shutdown() {
  printf "\n##### PERFORMING CLEAN SHUTDOWN... #####\n"
  docker exec mongotest mongo --eval "db.adminCommand( { shutdown: 1 } )"
  sleep 5s
  docker rm -v mongotest # removes the stopped container, not the volume
}

print_logs() {
  printf "\n##### PRINTING LOGS... #####\n"
  docker logs mongotest
}

pre_clean
start_mongo '4.0.28'
check_running
print_fcv
clean_shutdown

start_mongo '4.2.21'
check_running
print_fcv
set_fcv '4.2'
print_fcv
clean_shutdown

start_mongo '4.4.15'
check_running
clean_shutdown

start_mongo '4.2.21'
check_running
set_fcv '4.0'
print_fcv
clean_shutdown

start_mongo '4.0.28'
check_running
print_logs