KNOWLEDGE BASE

12May 2015

The best thing about CentOS 7 is, it has a super easy firewall built-in. I recommend you not to disable the firewall. To check the active zones: [root@rh7 ~]# firewall-cmd –get-active-zones public interfaces: enp1s0f0 To get available service names: [root@rh7 ~]# firewall-cmd –get-services RH-Satellite-6 amanda-client bacula bacula-client dhcp dhcpv6 dhcpv6-client dns ftp high-availability http https imaps […]

03Dec 2014

Most of the yum repos doesn’t include PHP5.6.X on current releases for the time being. So if you need PHP5.6.X, you need to compile and build it for your self. Advise: First of all, you should consider removing php packages from your server before compiling php, but beaware your codes will be visible till you […]

12May 2014

If you are struggling with millions of SPAM messages like me, you should rather use “find” instead of “rm” while deleting files in a folder. This method is tested to be faster than rm -rf: switch to the folder containing files, in my case: cd /var/spool/exim/ ans start deleting files by typing: find . -maxdepth […]

01May 2014

I was trying to delete a client’s all bounce emails that was caused by sending spam and rm -rf didn’t help me at this point first of all try to look at the default value of argument list for your server: type getconf ARG_MAX 2621440 And you can sipmly increase this value by typing: ulimit […]

23Apr 2014

Suddenly you realized that external SIP phones stop working without any reason, you should be avare of Cisco routers get stuck sometimes. There is a trick to solve the issue with two commands, but first of all be sure that the sip is not registered through arterisk cli: Type on your asterisk: asterisk -rvvvvv and […]

06Jan 2014

Some customers ask for a GUI on their Ubuntu Server, usually with Unity installed for a connection via TeamViewer. Although I personally don’t appreciate such methods, these usually mean that the customer has no idea on handling a Linux Server. Well it’s their problem and we should deliver their needs. After installing a fresh Ubuntu […]

11Dec 2013

Even though this seems an easy task, when you add IP’s with different gateways, you have to route the IP’s for the correct gateways. Let’s say you have two networks, 192.168.80.128/25 192.168.90.128/25 This means your gateways are 192.168.80.129, 192.168.90.129 and you have these IP addresses respectively : 192.168.80.130-254, 192.168.90.130-254 Lets assign the 192.168.80.x IP’s to […]

25Oct 2013

Most of the yum repos doesn’t include PHP5.5.X on current releases for the time being. So if you need PHP5.5.X, you need to compile and build it for your self. Advise: First of all, you should consider removing php packages from your server before compiling php, but beaware your codes will be visible till you […]