cd <your Magento install dir> 

find . -type f -exec chmod 644 {} \;                        // 644 permission for files

find . -type d -exec chmod 755 {} \;                        // 755 permission for directory 

find ./var -type d -exec chmod 777 {} \;                // 777 permission for var folder    

find ./pub/media -type d -exec chmod 777 {} \;

find ./pub/static -type d -exec chmod 777 {} \;

chmod 777 ./app/etc

chmod 644 ./app/etc/*.xml