Drupal 8.x

I am running Drupal8.1.7 on OpenSUSE Leap 42.1. Apache2 runs as wwwrun, and my whole drupal8 directory is
chown -R wwwrun:www drupal8
But when I try to install the admin toolbar, I get permission errors:

Warning: mkdir(): Permission denied in Drupal\Component\PhpStorage\FileStorage->createDirectory() (line 176 of core/lib/Drupal/Component/PhpStorage/FileStorage.php).

What am I doing wrong?

I've composer-installed a Drupal8 multisite.

The project tree includes

<proj>/
	composer.json
	composer.lock
	.git/
	.gitignore
	web/
		autoload.php
		core/
		index.php
		modules/
		profiles/
		robots.txt
		sites/
			default/
			siteA/
			siteB/
			siteC/
			development.services.yml
		themes/
		update.php
		web.config

I want the project under git revision control.

With one site, it's all clear how to pull/push changes.

Hey,
I recently updated my site from 8.1.3 to 8.1.7. Following the installation guide I put my site in maintenance mode. But now my site is updated i can't leave maintenance mode. If I go to my sites adress i get the message that the site is in maintenance but i don't know where to go to take my site out of maintenance .

thanks

Hi,
A couple of days ago, I posted this to the ugprading drupal forum. I haven't received a response there, and I was curious if that might be the wrong topic for it.
I'll post a link here.
https://www.drupal.org/node/2770325
Sorry if reposting like this is not polite here (this is the firt time I have posted to drupals forums).

Hi all,

I'm receiving a 500 internal server error after attempting to update my site from Drupal 8.1.5 to 8.1.7.

After replacing /core, /vendor, and all the files in the top level directory, /update.php will only return a 500 error. This does not occur when navigating to /update.php with /core and /vendor from 8.1.5.

None of the files I am replacing are customized at all, and this did not occur last week when moving from 8.1.3 to 8.1.5.

I unfortunately deleted data on root directory of a webspace. After reinstalling drupal the old website doesnt work after importing old database :

The website encountered an unexpected error. Please try again later.

What can I do? Migration module only migrates D6 and D7 to D8 but not D8 to D8.