Plesk

Error : “Identifier removed: couldn’t grab the accept mutex” in apache error logs

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Apache was getting stopped automatically with the below logs in the Apache Error log:

[Tue Jul 22 22:29:35 2014] [alert] Child 30758 returned a Fatal error… Apache is exiting!
[Tue Jul 22 22:29:35 2014] [emerg] (43)Identifier removed: couldn’t grab the accept mutex
[Tue Jul 22 22:29:35 2014] [emerg] (43)Identifier removed: couldn’t grab the accept mutex
[Tue Jul 22 22:29:35 2014] [emerg] (43)Identifier removed: couldn’t grab the accept mutex

These type of errors occur on systems low on memory or file handlers.The AcceptMutex directives sets the method that Apache uses to serialize multiple children accepting requests on network sockets.

One suggested resolution for the error message would be to try adding the following line to /usr/local/apache/conf/httpd.conf file:

AcceptMutex fcntl

If you add this above “<IfModule prefork.c>” in tht file, you could then try running these commands to distill the change and restart Apache:

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Change the Max File Upload Size for PhpMyAdmin in Plesk

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In some cases, we need to restore  big databases using phpmyadmin. In that cases, we need to increase the upload limit in phpmyadmin to accomplish this. Change the values (to the required value) “upload_max_filesize” & “post_max_size” in the file “/usr/local/psa/admin/conf/php.ini” And restart the apache, here plesk service providing the apache for phpmyadmin, so restart psa. /etc/init.d/psa stop … Read more

[ERROR] /usr/sbin/mysqld: Can’t open file

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I got this error while migrating  huge amount of accounts from one cpanel server to  another.

[ERROR] /usr/sbin/mysqld: Can’t open file: ‘./dbname/tablename.frm’ (errno: 24)

errno: 24 means there is too many open files.  There is a mysql variable named “open_files_limit"  which shows how many open files are allowed in mysql by default. We cannot update this valuse using “Set”  command as this variable is a read only variable.

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How to change the Notifications Email’s Subject in Plesk.

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Last day one of client asked me about this and on checking I can see the pre defined notification email has edit option for the body but not for the Subject.

To get this done, we may need to access the plesk database and change the Subject of the desired notification from “psa.notification” table

Before you start working on this, always take a mysqldump for “psa” so that if any thing goes wrong, you can simply restore from the backup.

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How to check a website in a remote server before DNS change

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In all migrations, we may wish to check the domain’s functionality and fix any errors preset  to make the dns change smoother and perfect. So just thought to add this in our blog too 🙂

Some control panel offer site preview, especially Plesk using which we can take a look on domain  hosted in that domain. But in others like cPanel, Directadmin and those without any control panels, we may need to check this using  local hosts file or by changing the A record on a temporary basis.

Best method is to check websites using your local “hosts” file in your PC / Laptop. Below is the steps using which one can test a website hosted in a remote server without changing the name server.

For Windows

1.  Locate the hosts file in your computer. Typically it is in one of the following locations:

Windows NT/2000/XP/2003/Vista/7   —     C:\windows\system32\drivers\etc\hosts
Windows 95/98/Me                                         —     C:\windows\hosts

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Mail bouncing from Microsoft’s Exchange email service in Plesk

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Mails from microsoft exchange email services are failed in plesk (qmail). Upon investigation we found that the grey list filter in plesk 10 is blocking server that are on “dsl|pool|broadband|hsd” address ranges. In this case it would be Microsofts cloud anti-spam service that is on “pool” addresses.

Some Microsofts cloud anti-spam servers are;

co9outboundpool.messaging.microsoft.com
db8outboundpool.messaging.microsoft.com
db9outboundpool.messaging.microsoft.com
am1outboundpool.messaging.microsoft.com

Log entries are like this

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