Category Archives: Virtualization

Contabo: A great cloud for personal use

I’m a personal user of Contabo’s cloud services, and I’ve been delighted with them. They offer a wide range of services to choose from, including VPS, dedicated servers, and cloud storage. I’m currently using a VPS to host my personal … Continue reading

Posted in Computer, Linux, Networking, Storage, Virtualization | Leave a comment

Update GNS3 server on GNS3 IOU VM

GNS3 Sourceforge account provides an OVA image ready to run gns3-server for those who want to use Cisco IOS on Unix images . However, at the time of this writing, the gns3-server version is outdated (1.3.3). The client must have … Continue reading

Posted in Computer, Linux, Networking, Virtualization | Leave a comment

VMware and Windows poor TCP performance

I have had a strange issue lately with Windows servers on VMware vSphere 5.1 hosts. Throughput of TCP connections between some virtual machines were very very slow, barely 10 mbit/s . The behavior was easily reproducible : just start an … Continue reading

Posted in Computer, Microsoft, Virtualization, VMware | Leave a comment

VMware vCSA 5.1 password expiration

A few months ago, I was unable to login on my vCSA. At that time, I thought it ws a glitch, I rebooted (didn’t fix the issue) and changed the password of the users, which fixed the issue. Recently, I … Continue reading

Posted in Computer, Linux, Virtualization, VMware | Tagged , , , | Leave a comment

LSI Megaraid Storage Manager and VMware ESXi

I had to configure a bunch of ESXi 5.1 servers with LSI 9240-4i hardware RAID controllers the other day. This RAID controller is perfectly supported in ESXi 5.1 but it lacks the monitoring features. To have these, you need to … Continue reading

Posted in Computer, Networking, Virtualization, VMware | 2 Comments

Nagios and SNMP traps

It has been explained many times over the internet, so I won’t cover that. One thing you have to pay attention to is, if you run snmptt as a daemon, be sure that it has the right to write to … Continue reading

Posted in Computer, Linux, Networking, Virtualization | 1 Comment

Don’t use SQL Server 2012 with VMware vCenter and modules yet

Update: I just saw that since April 25th, SQL Server 2012 and Windows Server 2012 are supported by VMware vCenter 5.1U1 . All information is available here : blogs.vmware.com/vsphere/2013/04/vmware-vcenter-server-5-1-update-1-released.html Original November 21th 2012: While it is working with the SSO … Continue reading

Posted in Computer, Microsoft, Virtualization, VMware | Leave a comment

Ubuntu 12.04 on HP Microserver N40L

Just some thoughts and things I’ve done. The hardware is the following: the Microserver itself, 2x 4GB DDR3, one 16GB USB flash drive, some 2TB SATA hard drives, Logitech S-150 USB speakers, and a GT520 HDMI+DVI graphic card. Installation on … Continue reading

Posted in Computer, Linux, Virtualization | Tagged , , , , | Leave a comment

vSphere NIC teaming, Cisco router and HP Procurve switches

So, like me, you want to have redundancy for your virtual machine network. For my lab setup, I use a refurbished Cisco router 3825 with two gigabit interfaces, two Procurve 2810-24G and a small server with 4 gigabit interfaces for … Continue reading

Posted in Computer, Networking, Virtualization, VMware | Tagged , , , , , , , , , , , , , , , | Leave a comment

vSphere CPU performance monitoring

Vos machines virtuelles sont lentes, vous pensez que le CPU n’est pas en cause parce que vous avez une utilisation faible des pCPU ? Regardez-y à deux fois, il se pourrait que vos VM attendent du pCPU disponible! Pour vérifier … Continue reading

Posted in Computer, Virtualization, VMware | Tagged , , , , , , , | Leave a comment