Docker reverse proxy for localhost dns

docker-reverse-proxy

exists()
{
  command -v "$1" >/dev/null 2>&1
}

if exists dnsmasq; then
    echo 'Your system already has dnsmasq installed skipping install'
else
    echo 'brew install dnsmasq'
    brew install dnsmasq
fi

TLD='address=/localhost/127.0.0.1'
DNSMASQCONF=/usr/local/etc/dnsmasq.conf
echo "sudo grep -q $TLD $DNSMASQCONF || sudo echo "$TLD" >> $DNSMASQCONF"
sudo grep -q "$TLD" "$DNSMASQCONF" || sudo echo "$TLD" >> "$DNSMASQCONF"

if [ -d '/etc/resolver' ]; then
    echo 'Directory /etc/resolver already exists skipping'
else
    echo 'sudo mkdir -p /etc/resolver'
    sudo mkdir -p /etc/resolver
fi

NAMESERVER='nameserver 127.0.0.1'
RESOLVER=/etc/resolver/localhost
echo "grep -q $NAMESERVER $RESOLVER || echo $NAMESERVER >> $RESOLVER"
sudo grep -q "$NAMESERVER" "$RESOLVER" || echo "$NAMESERVER" | sudo tee "$RESOLVER"

echo "sudo brew services restart dnsmasq"
sudo brew services restart dnsmasq

CONTAINER='nginx-proxy'
RUNNING=$(docker inspect --format="{{ .State.Running }}" $CONTAINER 2> /dev/null)

if [ $? -eq 1 ]; then
    echo "docker run --restart=always -d --name $CONTAINER -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy"
    docker run --restart=always -d --name $CONTAINER -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
else
    echo "Error container by name $CONTAINER already exists"
    echo "Make sure it is same as below else remove and run command below:"
    echo "echo "docker run -d --name $CONTAINER -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy""
fi