Update the /etc/hosts file with Docker container IPs and names

docker_ip_resolver.sh

#!/bin/bash

DOCKER_HOSTS_FILE="$HOME/tmp/docker-hosts"
HOSTS_NEW_FILE="$HOME/tmp/hosts.new"

# Get the list of running containers
CONTAINER_IDS=$(docker ps -q)

# Clear the current Docker hosts file
echo "# Docker container IPs" > $DOCKER_HOSTS_FILE

# Iterate through each container
for CONTAINER_ID in $CONTAINER_IDS; do
  # Get the container name and IP address
  CONTAINER_NAME=$(docker inspect -f '{{ .Name }}' $CONTAINER_ID | sed 's/^\///')
  CONTAINER_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $CONTAINER_ID)

  # Add an entry to the Docker hosts file
  echo "$CONTAINER_IP $CONTAINER_NAME #DOCKER-ENTRY" >> $DOCKER_HOSTS_FILE
done

# Concatenate the Docker hosts file with the main /etc/hosts file
cat /etc/hosts | grep -v "#DOCKER-ENTRY" > $HOSTS_NEW_FILE
cat $DOCKER_HOSTS_FILE >> $HOSTS_NEW_FILE

# Replace the original /etc/hosts file
sudo mv $HOSTS_NEW_FILE /etc/hosts