append configuration

install_docker.sh

@@ -52,7 +52,8 @@ usermod --append --groups docker admin
 #
 # Check configuration: docker info | grep Base
 # Check configuration: docker network inspect bridge | grep Subnet
-cat >/etc/docker/daemon.json <<EOL
+touch /etc/docker/daemon.json
+cat >>/etc/docker/daemon.json <<EOL
 {
   "log-driver": "journald",
   "bip": "172.17.0.1/22",