Most of the data centers and hosting providers are now offering SSD (Solid-state drive). If you run the fdisk command to check the drives it’s still going to show as sda/hda. Since kernel 2.6.29 Linux automatically detects SSD. Now to verify sda for SDD. Simple cat the /sys/block/sda/queue/rotational file. If the output is “0” then …
Today I installed latest version of varnish on a new server and configured it manually. I tried to start it but it was failing. So I did a configuration file test and it gave below error. # varnishd -C -f /etc/varnish/default.vcl Message from VCC-compiler: VCL version declaration missing Update your VCL to Version 4 syntax, …
Varnish: VCL version declaration missing Update your VCL to Version 4 syntax Read More »
OVH provide dedicated servers with their own customized kernels. Also the loaded disk partitions too will look odd to you. Now if you directly run the virtualizor installation script then it will get installed but it will not work. Because the Xen/KVM kernel and modules will not be loaded. So we will have to first …
System administrators generally use the sendmail or mail utility from mailx to send emails. Which automatically send the email from username@hostname. But there are times when you want to send email from external email server and it requires SMTP authentication. Python is a very powerful scripting language and we can use this below simple script …
If you are not able to access email even with correct username and password and you see below error in the /var/log/maillog Jul 5 18:15:20 hostname dovecot: auth: Error: Cpanel::MailAuth: Failed to getpwnam for user webmaster Jul 5 18:15:38 hostname dovecot: auth: Error: Cpanel::MailAuth: Login not permitted to account with a uid lower then 500 …
dovecot: auth: Error: Cpanel::MailAuth: Failed to getpwnam Read More »
On May 13th, 2014 WHMCS released new upgrade to version 5.3.7. And we have upgraded it on lots of sites during the past month. But there was bug in the update which made it send blank emails. To fix this Login to WHMCS as administrator Click on Setup -> General Settings -> Mail Tab In …
Blank email after WHMCS upgrade to version 5.3.7 Read More »
We rebuild the Apache with modsecurity 2.7.3 on one of the server. But for some reason all file uploads to the server started failing with “500 Internal Server Error”. And below errors started showing up in the logs on each file upload. [Sat Jun 14 15:04:09 2014] [error] [client xx.xx.xx.xx] ModSecurity: Multipart parsing error: Multipart: …
ModSecurity: Multipart parsing error: Multipart: Failed to create file: /root/tmp/ Read More »
We had recently upgraded plesk to version 12 on one of the server and it showed warning that ftp service will not work unless IPV6 is enabled on the server. This happens because new version of proftpd is by default configured only listen on IPV6 ports. There is a very simple solution for this. Just …
For security you might want to disable direct SSH login as root. First of all login as root and create an user which useradd sshadmin passwd sshadmin Now add this user to wheel group from WHM WHM -> Security Center -> Manage Wheel Group Users OR from command line usermod -G wheel sshadmin Now open …
Sometimes operating system or hard drive crashes and makes your system un-bootable. Don’t panic. There are still chance that you recover all or most of your data. Call you data center and ask them to install OS on a new hard disk and mount your crashed disk as secondary drive. Once your server is up …