Unified Server Configuration / Lifecycle Controller is one of the best, OS independent ways to update DELL server BIOS and firmware of various integrated components. To boot into Unified Server Configuration press F10 (System Services) during system start-up. Then, to initiate the Update module, go to Platform Update > Launch Platform Update > FTP Server. No need…

Issue VMware ESXi 5.5.0 datastore does not mount automatically after VM host server is rebooted. You can obviously manually add the datastore, but this doesn’t resolve the main issue, which is that all VMs hosted on that datastore go offline if VM host is restarted or recovers from a power cut.

Increasing size of a virtual disk in VMware ESXi is pretty simple process. Open VMware ESXi vSphere Client Right click on the virtual machine that holds the disk in question and select “Edit Settings“ Select the Hard Disk in question and change “Provisioned Size” to the required size Click OK

Issue Apache on CentOS 7 can’t send emails via Sendmail. Website front-end displays following error: Could not execute: /usr/sbin/sendmail /var/log/maillog file shows following error: sendmail[2450]: NOQUEUE: SYSERR(apache): /etc/mail/sendmail.cf: line 0: cannot open: Permission denied

Background Tixbox Asterisk VOIP server on company’s LAN network. Remote client with Linksys SPA 942 VOIP phone trying to connect to Asterisk VOIP server via WAN (no VPN). Remote client has a static external IP address 82.67.44.44 SonicWall firewall on company’s network is configured as follows: The firewall has a range of 8 external IP…

SELinux, short for Security Enhanced Linux, is a Linux security module that is part of many Linux server distributions. While SELinux increases server security (despite being created by NSA), it often results in some unexpected access/permission denied errors. If you get one of such errors on a server with SELinux enabled, and there are no…

This tutorial shows how to setup Apache Virtual Hosts in CentOS 7. This is useful if you want to host more than one website on a single CentOS web server. For instructions on how to setup Apache, PHP, and SQL database on CentOS 7, check this article.  Setup folder structure for your websites We are going to…

Install CentOS (minimal install). Configure network Run: ip a to find your network adaptor’s name. In my case the adaptor is called ens32. Navigate to /etc/sysconfig/network-scripts/ and open network configuration file with your network adaptor name, i.e. ifcfg-ens32 vi ifcfg-ens32 Edit the file replacing all IP addresses according to your network requirements.  HWADDR =00:0B:27:A1:DC:1ATYPE=EthernetBOOTPROTO=staticONBOOT=yesIPADDR=192.168.0.10NETMASK=255.255.255.0GATEWAY=192.168.0.1DNS1=8.8.8.8DMS2=208.67.222.222 Start network: service network start…

Issue VMware ESXi vSphere client host Health Status (Configuration tab) shows Unknown and Question marks (?) next to each component. Trying to Reset Sensors fails with error:

WinSCP is a convenient way to download and upload files to VMware datastores. To connect with WinSCP you have to enable SSH on your VMware host (it is disabled by default):

If your vmware host machine unexpectedly rebooted due to power cut or any other reason, by default all virtual machines remain in powered-off state. To make them boot automatically perform following: Open vmware vSphare Client Select your vmware host and change to Configuration tab Under Software column click on Virtual Machine Startup/Shutdown, then click on Properties…

Environment Trixbox 2.6 PBX (Asterisk 1.4) Mixture of Linksys SPA 942 and Yealink SIP-T22P VOIP phones Phones connecting to the PBX from a remote site over WAN. Issue People using Yealink SIP-T22P SIP phones occasionally can’t receive incoming calls. Outgoing calls working fine. Linksys phones are not affected. When the issue occurs Asterisk CLI shows…