Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the following as you can (you can cut and paste this into your topic):
Nextcloud version (eg, 10.0.2): 11.0.2
Operating system and version (eg, Ubuntu 16.04): Ubuntu-Server 16.04 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.18
PHP version (eg, 5.6): 7.0.15
Is this the first time you’ve seen this error?: No, it is not the first time, it happened a few times this week…
Can you reliably replicate it? (If so, please outline steps): No, I am not able to replicate it, it is a temporarily error, that happens a few times a day.
The issue you are facing:
My Nextcloud is not available during a few minutes, when this error appears. This happens a few times a day.
The output of your Nextcloud log in Admin > Logging:
Error PHP PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known at /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php#43
Error PHP Doctrine\DBAL\DBALException: Failed to connect to the database: An exception occured in driver: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known at /var/www/nextcloud/lib/private/DB/Connection.php#60
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxx',
'passwordsalt' => 'xxxxxxx',
'secret' => 'xxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'xxxxxx',
1 => 'xxxxxxx',
2 => 'xxxxxxxx',
3 => 'xxxxxxxxxx',
),
'datadirectory' => '/backup/data',
'overwrite.cli.url' => 'https://xxxxxxxxxxxx/owncloud',
'dbtype' => 'mysql',
'version' => '11.0.2.7',
'dbname' => 'xxxxxxxxxx',
'dbhost' => 'xxxxxxxxxxxx',
'dbtableprefix' => 'oc_',
'dbuser' => 'owncloud',
'dbpassword' => 'xxxxxxxxxxxx',
'logtimezone' => 'UTC',
'installed' => true,
'loglevel' => 2,
'mail_smtpmode' => 'smtp',
'mail_from_address' => 'xxxxxxxxx',
'mail_domain' => 'xxxxxxxxxx',
'mail_smtphost' => '192.168.110.7',
'mail_smtpport' => '25',
'theme' => '',
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
);
The output of your Apache/nginx/system log in `/var/log/____`:
[Fri Apr 21 00:15:42.944333 2017] [ssl:warn] [pid 1675] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Fri Apr 21 00:15:42.944522 2017] [mpm_prefork:notice] [pid 1675] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g configured -- resuming normal operations
[Fri Apr 21 00:15:42.944532 2017] [core:notice] [pid 1675] AH00094: Command line: '/usr/sbin/apache2'
[Fri Apr 21 00:25:38.238844 2017] [mpm_prefork:notice] [pid 1675] AH00169: caught SIGTERM, shutting down
[Fri Apr 21 00:30:04.516191 2017] [ssl:warn] [pid 1706] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Fri Apr 21 00:30:05.251826 2017] [ssl:warn] [pid 1711] AH01909: 127.0.1.1:443:0 server certificate does NOT include an ID which matches the server name
[Fri Apr 21 00:30:05.256067 2017] [mpm_prefork:notice] [pid 1711] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g configured -- resuming normal operations
[Fri Apr 21 00:30:05.256093 2017] [core:notice] [pid 1711] AH00094: Command line: '/usr/sbin/apache2'
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Remember, this information may be requested if it isn't supplied; for fastest response please provide as much as you can :heart: Feel free to use a pastebin service, otherwise log files can be indented with 4 spaces on each line to present them in a friendlier way on the forum.