Month: July 2014

How to block Brute force Attack on WordPress , Joomla in Fail2ban

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Clients who use fail2ban can block the bruteforce attack on wp-login.php and joomala admin using the below details. In /etc/fail2ban/jail.conf add the below details [wordpress-wp-login] enabled = true port = http,https action = iptables[name=WP, port=http, protocol=tcp] sendmail-whois[name=wordpress-wp-login, [email protected]] filter = wordpress-wp-login logpath = /var/www/vhosts/*/statistics/logs/access_log maxretry = 3 [joomla-admin-index] enabled = true port = http,https action … Read more

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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Product images not working and giving “Warning: Creating default object from empty value” Error

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Last day there was an issue for a wordpress installation. None of the product images are not working and if we take the image directly in the browser, we can see the below errors

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Warning: Creating default object from empty value in /home/wp-user/public_html/wp-content/plugins/shopp/core/model/Asset.php on line 123

Warning: Cannot modify header information – headers already sent by (output started at /home/wp-user/public_html/wp-content/plugins/shopp/core/model/Asset.php:123) in /home/wp-user/public_html/wp-content/plugins/shopp/core/model/Asset.php on line 199

Warning: Cannot modify header information – headers already sent by (output started at /home/wp-user/public_html/wp-content/plugins/shopp/core/model/Asset.php:123) in /home/wp-user/public_html/wp-content/plugins/shopp/core/model/Asset.php on line 200

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Install Redis Daemon and Redis PHP extention on CentOS/RHEL/cPanel

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Redis is an open-source, networked, in-memory, key-value data store with optional durability. It is written in ANSI C. It’s a “NoSQL” key-value data store. More precisely, it is a data structure server. To install Redis as daemon on a CentOS/RHEL/cPanel server, do the following steps cd /usr/local/ wget http://download.redis.io/releases/redis-2.8.12.tar.gz tar -xvzf redis-2.8.12.tar.gz cd redis-2.8.12 make … Read more