diff --git a/installers/full_install_osm.sh b/installers/full_install_osm.sh
index c4141db..b92d6ad 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -218,7 +218,7 @@
             remove_stack osm_elk
         fi
         echo "Now osm docker images and volumes will be deleted"
-	# TODO: clean-up of images should take into account if other tags were used for specific modules
+        # TODO: clean-up of images should take into account if other tags were used for specific modules
         newgrp docker << EONG
 for module in ro lcm keystone nbi mon pol pla osmclient; do
     docker image rm ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module}:${OSM_DOCKER_TAG}
@@ -404,16 +404,16 @@
         echo "Configuring docker proxy ..."
         if [ -f /etc/docker/daemon.json ]; then
             if grep -q registry-mirrors /etc/docker/daemon.json; then
-                sudo sed -Ei 's/("registry-mirrors".*\[)(.*)\]/\1\2, \"'"${DOCKER_PROXY_URL}"'\"\]/' /etc/docker/daemon.json
+                sudo sed -i "s|registry-mirrors.*|registry-mirrors\": [\"${DOCKER_PROXY_URL}\"] |" /etc/docker/daemon.json
             else
-                sudo sed -i 's/{/{\n  "registry-mirrors": [\"'"${DOCKER_PROXY_URL}"'\"]",/' /etc/docker/daemon.json
+                sudo sed -i "s|{|{\n  \"registry-mirrors\": [\"${DOCKER_PROXY_URL}\"],|" /etc/docker/daemon.json
             fi
         else
-            sudo bash -c 'cat << EOF > /etc/docker/daemon.json
+            sudo bash -c "cat << EOF > /etc/docker/daemon.json
 {
-  "registry-mirrors": ["${DOCKER_PROXY_URL}"]
+  \"registry-mirrors\": [\"${DOCKER_PROXY_URL}\"]
 }
-EOF'
+EOF"
         fi
         sudo systemctl daemon-reload
         sudo service docker restart
@@ -570,11 +570,11 @@
             if [ $module == "PLA" -a ! -n "$INSTALL_PLA" ]; then
                 continue
             fi
-	    module_tag="${OSM_DOCKER_TAG}"
+            module_tag="${OSM_DOCKER_TAG}"
             if [ -n "${MODULE_DOCKER_TAG}" ] && echo $TO_REBUILD | grep -q $module ; then
                 module_tag="${MODULE_DOCKER_TAG}"
             fi
-	    echo "Pulling ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module_lower}:${module_tag} docker image"
+            echo "Pulling ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module_lower}:${module_tag} docker image"
             sg docker -c "docker pull ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module_lower}:${module_tag}" || FATAL "cannot pull $module docker image"
         done
     else