Save session to redis error when configured on php level (Exception' with message 'Warning: SessionHandler::read())

[biotech]

If php configured to save session on Redis instead of files - error below appear during the installation process. I use PHP 5.6 and https://github.com/phpredis/phpredis for store session in Redis, after change storage to files - everything works well. It looks like Magento not check if php session storage configured as files and trying to write sessions there. In my case this pretty confusing because i have configured like that

session.save_handler = redis
session.save_path = "/tmp/redis.sock"

So save_patch in that case it's location of Redis socket and Magento trying to write sessions just around that which is for sure cause error. This can cause issue with any other session storage like Memcached etc. I suppose Magento should check session storage type during the installation before write there and maybe support Redis and Memcached by default or if it's not possible (?) - recommend set files as save_handler in php.

Installing user configuration...
[ERROR] exception 'Exception' with message 'Warning: SessionHandler::read(): open(/tmp/php-sessions/sess_sbiru6o2s28e3b0gq6v6hhlp83, O_RDWR) failed: No such file or directory (2) in /var/www/magento2demo.firebearstudio.com/magento2/lib/internal/Magento/Framework/Session/SaveHandler.php on line 74' in /var/www/magento2demo.firebearstudio.com/magento2/lib/internal/Magento/Framework/App/ErrorHandler.php:67
Stack trace: #0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'SessionHandler:...', '/var/www/magent...', 74, Array)
#1 /var/www/magento2demo.firebearstudio.com/magento2/lib/internal/Magento/Framework/Session/SaveHandler.php(74): SessionHandler->read('sbiru6o2s28e3b0...')
#2 [internal function]: Magento\Framework\Session\SaveHandler->read('sbiru6o2s28e3b0...')
#3 /var/www/magento2demo.firebearstudio.com/magento2/lib/internal/Magento/Framework/Session/SessionManager.php(189): session_start()

[mazhalai]

@biotech thank you for reporting this error, we have created MAGETWO-42059 to track a fix for this.

[piotrekkaminski]

This was fixed and should be published soon.

[biotech]

Great job thanks !

[magenx]

in fact this error is still there

[siliconalchemy]

+1 still an issue

[AndreiAghenii]

Hello, I believe it is still an issue...
Processing configurations data from configuration file...
Import failed: Warning: SessionHandler::read(): open(${WEB_ROOT}/var/session/sess_cnkdti2mv2r35qc34n5qq2u5q6, O_RDWR) failed: No such file or directory (2) in /var/www/html/Magento2/vendor/magento/framework/Session/SaveHandler/Native.php on line 22
PHP Fatal error: Uncaught Exception: Warning: SessionHandler::write(): open(${WEB_ROOT}/var/session/sess_cnkdti2mv2r35qc34n5qq2u5q6, O_RDWR) failed: No such file or directory (2) in /var/www/html/Magento2/vendor/magento/framework/Session/SaveHandler.php on line 105 in /var/www/html/Magento2/vendor/magento/framework/App/ErrorHandler.php:61
Stack trace:
#0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'SessionHandler:...', '/var/www/html/s...', 105, Array)
#1 /var/www/html/Magento2/vendor/magento/framework/Session/SaveHandler.php(105): SessionHandler->write('cnkdti2mv2r35qc...', '')
#2 [internal function]: Magento\Framework\Session\SaveHandler->write('cnkdti2mv2r35qc...', '')
#3 {main}
thrown in /var/www/html/Magento2/vendor/magento/framework/App/ErrorHandler.php on line 61
Any help would be appreciated.

[AndreiAghenii]

Hey Guys, I fixed this issue, by providing correct path in php.ini:

'session' =>
array (
'save' => 'files',
'save_path' => '/var/www/session', ** if directory does not exist please create one.**
),

Hope this helps someone.