Tag: CentOS

Error: The monit service does not respond. Refer to Parallels technical support for help.

I have Plesk 12 installed on a machine running CentOS 6, but I am not able to start Watchdog due to the following error message: Error: The monit service does not respond. Refer to Parallels technical support for help. It seems that the monitrc template is using a log location which doesn’t exist and therefor […]

Solution for ip_conntrack: table full, dropping packet.

Today, I was working on a brand new  (apache) server, hosting a website with 3000 concurrent visitors. The load on the server was very low while the website was dropping network connections. I ran dmesg and the following message was repeating over and over: ip_conntrack: table full, dropping packet.   It seems that ip_conntrack keeps […]

How to install PAE kernel on CentOS

When you have 4GB or more memory and you have a 32-bit kernel running, your machine will be limited to use around 3GB of memory. All you have to do is install PAE kernel package. 1. Install the PAE kernel package: # yum install kernel-PAE 2. Check your grub menu list, the ‘default’ value should […]

Upgrading CentOS to CentOS 5.6

CentOS 5.6 has been released on April 8th, 2011. If you are running CentOS 5.5 you can simply upgrade to CentOS 5.6 via yum by running: # yum update If upgrading from a version earlier than CentOS 5.5, it is advised to follow this procedure: # yum clean all # yum update glibc\* # yum […]

Ads

Ads