Quickly add hostname aliases for running docker-compose containers

docker-compose-to-etc-hosts

#!/usr/bin/env bash

# Run this file on the host machine that is running dockerd
# It will allow you to access your docker containers via hostname aliases

# Remove old lines with suffix
sed -i -e "/#docker-temp/d" /etc/hosts

# Collect ip-addresses and hostnames of running docker-compose containers
ADDR=$(docker-compose ps -q | xargs --no-run-if-empty -I --- docker exec --- hostname -I| sed -e 's/ /-/')
NAMES=$(docker-compose ps -q|xargs --no-run-if-empty docker inspect -f '{{ .Name }}' | sed -e 's/\///' | sed -e 's/ /-/')

# Abort if containers aren't running
if [ -z "$ADDR" ]; then  
    echo no addresses    
    exit                 
fi                       
if [ -z "$NAMES" ]; then 
    echo no names        
    exit                 
fi                       

# Interleave addresses and hostnames, add suffix for easy removal later
LIST=$(paste <(echo "$ADDR") <(echo "$NAMES") --delimiters '-')                 
LIST=$(echo $LIST | sed -e "s/ /\n/g" | sed -e "s/-/ /g" | sed -e "s/$/ #docker-temp/")

# Add hostnames to /etc/hosts
bash -c "echo \"$LIST\" >> /etc/hosts"