Read-only file system: '/srv/media/house_preview/question_4.PNG'

Question

I have a simple Django app deployed to App Engine, which connects to Cloud SQL (PostgreSQL) instance. This Django app allows users to login/register and put up items for sale. Login/register works fine, but when putting up items for sale I get the following error:

Request Method: POST
    Django Version: 3.0.3
    Python Version: 3.7.7
    Installed Applications:
    ['projects',
     'blog',
     'users.apps.UsersConfig',
     'crispy_forms',
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles']
    Installed Middleware:
    ['django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware']



    Traceback (most recent call last):
      File "/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
        response = get_response(request)
      File "/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
        response = self.process_exception_by_middleware(e, request)
      File "/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
        response = wrapped_callback(request, *callback_args, **callback_kwargs)
      File "/env/lib/python3.7/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
        return view_func(request, *args, **kwargs)
      File "/srv/projects/views.py", line 28, in createListing
        link.save()
      File "/srv/projects/models.py", line 24, in save
        super(Listing_Database, self).save(*args, **kwargs)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 746, in save
        force_update=force_update, update_fields=update_fields)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 784, in save_base
        force_update, using, update_fields,
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 887, in _save_table
        results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 926, in _do_insert
        using=using, raw=raw,
      File "/env/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
        return getattr(self.get_queryset(), name)(*args, **kwargs)
      File "/env/lib/python3.7/site-packages/django/db/models/query.py", line 1204, in _insert
        return query.get_compiler(using=using).execute_sql(returning_fields)
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1383, in execute_sql
        for sql, params in self.as_sql():
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1328, in as_sql
        for obj in self.query.objs
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1328, in <listcomp>
        for obj in self.query.objs
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1327, in <listcomp>
        [self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1278, in pre_save_val
        return field.pre_save(obj, add=True)
      File "/env/lib/python3.7/site-packages/django/db/models/fields/files.py", line 288, in pre_save
        file.save(file.name, file.file, save=False)
      File "/env/lib/python3.7/site-packages/django/db/models/fields/files.py", line 87, in save
        self.name = self.storage.save(name, content, max_length=self.field.max_length)
      File "/env/lib/python3.7/site-packages/django/core/files/storage.py", line 52, in save
        return self._save(name, content)
      File "/env/lib/python3.7/site-packages/django/core/files/storage.py", line 267, in _save
        fd = os.open(full_path, self.OS_OPEN_FLAGS, 0o666)

    Exception Type: OSError at /projects/createListing
    Exception Value: [Errno 30] Read-only file system: '/srv/media/house_preview/question_4.PNG'

I'm pretty sure it's something to do with image upload.

Answer 1

Writing to Google App Engine instance is not allowed, you should use Google Cloud Storage if you want everything in Google realm

Edit your code to support different Google cloud storage backend -> for example using django-storage