How To Setup Networking For KVM Guests
I have a server with CentOS 5.4 with 5 IPs. Now i want to spare 1 IP for the host, and create 4 virtual machines, each with 1 dedicated IP and has direct access to internet (virtual machines created with KVM come with NAT as default)
Anyone can point me to a tutorial or tell me how to setup networking for this ? Working over GUI is not possible since i only have ssh access and don't want to install X just to install things. Is it possible to use Xen networking scripts for KVM guests ? I have tested Xen on my server and its default networking setting worked ie with guests have direct connection to internet.
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KVM Hypervisor And Guest OS Setup
I have been using Linux for the past 3 or so years, either running it for workstations or servers, and now I want to set up a server for Virtualization. I have been doing a fair bit of research about the different ways of doing this, and I have decided to go with KVM. I usually use CentOS, but will have to use Debian to use KVM. I just have a few questions about the best way of setting it up.
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What is the best way to set this up then? I was thinking we could install Debian as the Host/Hypervisor over the whole drive, and give it a 16GB swap partition. Then I guess when the VMs are installed they live on the Debian drive as a file, or do they need their own partitions?
Are the guest OS's capable of using the Host's swap space? Its bad enough losing 16GB as a swap partition to the host OS, but please don't tell me I need to supply the VMs with their own swap partition aswell - im curious as to if the server will ever need to use swap space as it has alot of ram, let alone require extra swap for each VM too?
KVM is still very new, but does anyone know any good books/resources out there? The virtualization books I have seen don't seem to cover KVM, just Xen and others.
How To Setup FreeBSD On Dedicated Server Without KVM
setup FreeBSD 7.2 amd64 on my dedicated server remotely. There is only problem I havnt access to KVM, but I have access to rescue system (linux image loaded into memory of the server, which enables me to perform any actions with help of linux tools on hard drive, it's easy to install any linux distro on the server - just format hdd and load files of OS, but I really dont know how to install FreeBSD by this way).
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I have a linux server that has a few gigabytes of data to retrieve off this system. I'm trying to network with so I can have outbound access to sftp into another server to relocate the files. I'm unable to ping google.com or access this other server. I tried setting it up using dhcp and static information, I've rebooted network protocals, I'm still unable to access any thing. Does anyone have any suggestions on what I could try next?
The machine is running fedora, no GUI only command prompt.
I am currently looking for a managed hosting solution for a small start-up.
The site will have a repository of articles in it, these will initially solely consist of documents (av. 2mb in size) and (based on performance) may be expanded to containing video/audio, however this is not likely to happen within (at least) the next six months.
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We have contacted various hosting providers (am in talks with Rackspace, Rochen and Network Redux) and have had everything from SAN to a 500GB (RAID 1) recommended to us.
As the site is still currently in Beta with nothing in it and proposed launch date is March 09, I would be grateful if anyone who was in a similar position could inform me how their infrastructure evolved as the site demanded more resource.
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Routing / Networking
I'm experiencing some odd issues, I have a cpanel setup, however on port 2086 the server is currently listening however on port 80 it fails to listen. Apache is running and no errors appear in the errors log.
Running ifconfig shows that there are errors and dropped packets.
I was changing ip routes earlier that day however all seems fine...
Oddly I can ping internally on the network and noticed a number of other servers in the broadcast range. These respond fine, however pinging google or outside the data center fails.
ping: unknown host google.com
eth0 Link encap:Ethernet HWaddr 00:14:85:3D:A2:20
inet addr:122.252.4.* Bcast:184.108.40.206 Mask:255.255.255.0
inet6 addr: fe80::214:85ff:fe3d:a220/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:289198921 errors:4 dropped:182 overruns:0 frame:3
TX packets:230175646 errors:19 dropped:0 overruns:0 carrier:19
RX bytes:3521641159 (3.2 GiB) TX bytes:2563591520 (2.3 GiB)
Base address:0x2400 Memory:dd100000-dd120000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:127443475 errors:0 dropped:0 overruns:0 frame:0
TX packets:127443475 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:1102069037 (1.0 GiB) TX bytes:1102069037 (1.0 GiB)
I have a question: I was asked this on an interview, now I am good at home networking but nothing enterprise and this was not for a networking position but for data entry and possibly some ASP NET coding.
I was asked if you had two nics on one server each connected to a seperate switch with different IPs and subnets what possible problems could arise?
Note I am curious about this I do not plan on leanring more about networking then curiosity which this is.
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on the 3rd computer, it can access the other 2 for file sharing, but is 'NOT' accessible from the other 2. when try to access the 3rd computer through 'network places', i get the error: "//COMPUTER is not accessible. You might not have permission...."
however, if I actually type in "COMPUTERsharedfolder" - to access the 3rd computer, I can, so basically, I CANT access "COMPUTER" but CAN access "COMPUTERsharedfolder" ..
VMWare Server Networking
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This also happens on other services like FTP and stuff.
My VPS is running Windows XP Professional SP2 with a legal retail license and my main OS on the server is CentOS 4.5
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Confused About VMWare Networking
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The second server will have both the Public and Private Interfaces enabled. On this server, I will have two VMs and both of these VMs should be able to access both the host PCs, each other, as well as the VM on the first server. Additionally,t These two VMs should also be able to access the Internet.
What would be the best way of going about this configuration.
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I am building a social network site, and I'm very skeptical about the offer the social networking company had for hosting (mainly storage and bandwidth costs). They are hosted through AT&T, and did the whole "tier 1" ******** speech, and wanted to charge $179/mbps/month, $1.17/GB for CDN storage, and $1/GB for normal storage.
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I'm working on a social networking prototype that will hopefully soon become a beta with moderate user load. I have zero experience in the field of web hosts other than rolling out a web application in an internal server at my last job.
The application is being developed in C#/ASP.NET 3.5 with MS SQL Server.
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VMWare Server 1.0.4 - Windows XP Networking
I installed VMWare Server 1.0.4 on my dedicated server, and set-up a new Windows XP Professional VM.
I have 3 more IP's that are not used.
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My VPS is running Windows XP Professional SP2 with a legal retail license and my main OS on the server is CentOS 4.5 (detailed hardware is mentioned below)
Do you have any idea how can I configure my network so anyone can enter the VPS?
And please, if you can explain me step by step because I'm a real newbie hehe
- Nadav Peretz
Also, I saw some topics with solutions but I didn't got a chance to understand something ;
ow and sorry for my English, I know its not perfect : P
(I read the sticky, I dont think this stuff are necessary but I posted them anyway:
Kernel Version: 2.6.9-22.ELsmp
Dual Xeon 3.20GHz with 2GB RAM, 120GB HD 10,000 RPM (Sorry for the un-detailed hardware)
[root@server ~]# vmstat 5 5
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 160 17132 6572 1930168 0 0 121 295 31 146 1 8 90 2
0 0 160 17132 6580 1930160 0 0 0 7 1020 589 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1016 597 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1020 601 0 1 99 0
0 0 160 17132 6580 1930160 0 0 0 0 1016 598 0 1 99 0
Using CentOS 4.5
VMWare - WinXP As Guest On CENTOS - Networking
OKay here is the set up:
I have a CENTOS 64bit running, with 1 guest OS (WinXP) in a VMWare Server. I have tried the following: I have 6 public IP's attached to my 1 Ethernet card in the CENTOS host.
The Guest OS is set to use "Bridged" Networking. This allows full use of the internet, in both directions. Not exactly optimal, but it does work. I can reach the Guest via RD, which is a requirement for this client. The guest OS is mainly assigned one of the 6 public IP's (x.x.x.118). The problem with this setup is the Guest OS can not reach the host. For example the host has a mail server on it, and when the Guest tries to reach the host, it times out.
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I prefer setup number 2 for all the obvious reasons, but I just can not get my IPTables rules to work. This is what I thought should work, but does not:
iptables -t nat -I PREROUTING -d x.x.x.118 -j DNAT --to-destination=192.168.100.128
iptables -t nat -I POSTROUTING -s 192.168.100.128 -j SNAT --to-source=x.x.x.118
I realize that would have done all traffic, and defeated the benefits of NAT,but since forwarding only 3389 was not working I tried forwarding everything.
Interesting Fact Go Daddy Launches Networking Site
I have found this news. What you think? I think that they are trying do things better.
November 2, 2007 -- (WEB HOST INDUSTRY REVIEW) -- Domain registrar and Web hosting provider Go Daddy (godaddy.com) announced on Friday it has launched the Go Daddy Connections (godaddyconnections.com) networking site. The new interactive resource provides a virtual community for social and business networking.
Go Daddy Connections enables Go Daddy customers to exchange helpful information, feedback and ideas to better leverage their business assets. The online community, which features topics, articles and forums, connects business owners and all like-minded Go Daddy customers at no cost.
"Small and midsize business owners have questions about running their business online and Go Daddy Connections gives them a place to interact and exchange ideas with other business owners," says Bob Parsons, Go Daddy CEO and founder. "In today's world, if you aren’t online, you aren’t staying competitive – for yourself or your customers."
Go Daddy Connections enables customers to identify important topics, educate themselves and others on business methods or practices and share relevant topical data with one another. Users can also rate and provide feedback on the site, as well as promote their own businesses.
The company announced yesterday it has been seeing tremendous growth in registrations for the .us domain name extension.
Copyright © 2007 Web Host Industry Review, Inc. All rights reserved.
Linux Advanced Networking: Forwarding / Cloning UDP Traffic
I am trying to find an application that can listen on a given UDP port, say "6271" and forward all traffic (UDP) sent to that port to another IP (not on the same subnet).
I should not call this forwarding, but instead, cloning (because forwarding usually is only on the same subnet or vlan). The packets should not be modified, (thus IP information in packet ect.)
Is this possible? I have tried some applications such as,
IWeb Technical Support Reps And System Admins Dont Understand Basic TCP-IP Networking
I want to pass on a warning before anyone goes with iWEB. I just ordered a $269 a month dedicated server so I could run vmware on it for my own virtual machines that I need.
With this server I got 7 IPs.
The primary IP they assigned me is say for example: 70.xx.15.171 with a GW of 70.xx.15.161. The secondary ips they issue me are 70.xx.18.249-254. So these are on a completly different subnets.
After talking on the phone to several differnt people including tech support who tells me this will work jsut fine useing thoes secondary ips on my VMs and to not put a gateway address. I talk to my account manager he says to open a ticket that he will forward to their system admins.
This is the ticket I opened.
I just got a new server set up CL-T113-140CL. It was
assigned the primary ip of 70.xx.15.171 with a GW of 70.xx.15.161. My
secondary ips are 70.xx.18.249-254. The server we got from you is a
VMWare host. We need to use the secondary IPs for the Guest VMs. How
ever the primary and secondary IPS are on different subnets and so
the VMs useing the IPs 70.xx.18.249-254 can not talk to the gateway.
I need to have a gateway server IP to use for my VMs.
Please either give me a valid GW address for the 70.38.19.x subnet or
assign new secondary IPs on teh 70.xx.15.x subnet with a SM that can
talk to the 70.xx.15.161 GW assigned.
this is the reply I get back from their system adminstrator
The gateway to be used for your secondary IP addresses is the same as
the one for your primary. You should not have anything to change,
gateway-wise. Just leave the current one as default gateway and
everything should work just fine.
If there is anything please do not hesitate to contact us.
Jean-Francois Doucet [iWeb]
System Administrator / Administrateur Système
Support / Client Hub : [url]
Are they brain dead at iWEB? DO they understand basic TCP-IP networking at all?
Here is my last reply. I tried to make it real simple for them to understand.
This does not address the issues. Do you even know what a virtual
machine is? It is a virtual computer running on the host computer.
The host computer has a valid ip address of 70.xx.15.171, sm:
255.255.255.224 gw: 70.xx.15.161. The virtual machines (or guest
operating systems) if I assign it the IP address of 70.xx.18.249 SM:
255.255.255.248 with no gateway it is physically impossible for it to
reach the gateway of the host pc 70.xx.15.161. You have to understand
the Virtual Machine operates as a completely separate computer. It
requires its own gateway. with no gateway specified it has no way to
get out of its local subnet to get to the 70.xx.15.x subnet. What
happens if you put two physical computers on one hub. The computer on
port 1 of the hub has the IP info 70.xx.15.171 SM: 255.255.255.224 GW
70.xx.15.161. The second computer is on port 2. It has the ip info
of: 70.xx.18.249 SM: 255.255.255.248 GW: NONE.
How is the pc on port 2 going to communicate with the pc on port
1? This is the exact situation we are in. There has to be a
gateway to route the IP traffic from pc2 to pc1 to get onto the
Dedicated Or Reseller Setup With Virtualization Or Decent Chroot Setup
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I have learnt it is harder to setup than I initially expected (since I have just moved from a shared hosting service). I am in need of some help setting up my DNS servers, as I am very confused. Here is most of the info I know:
1) I am running HyperVM
2) I've installed LXAdmin
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I heard a lot of things about KVM that it lets me control the server and its like Im in front of the server, etc...
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I am trying to set up a server (not really going to serve web-pages just setting it up to download a few torrents at a friend house as the broadband gods laugh at me) any how back on point I was wondering if kvm over cat5e would allow me to to use to use the mouse, keyboard, and video from my home (I am on dial up)?
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KVM Over IP System
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KVM Over TCP-IP
I was wondering if this is a good solution for a server room or a colo facility where you have multiple servers:
what is a popular product that allows you to see messages on the server when it's
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Couldn't you just remote access into your server from elsewhere? This would save you the hassle and cost of buying/installing/maintaing the KVM equipment?
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KVM And Centos
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Best Multi User IP KVM
I am currently looking for a new IP KVM. Right now I use a mix of HP and Raritan KVMs and I'm honestly not super happy with either of them. The main feature I'm looking for is the ability to setup multiple users and only allow them to access certain ports/devices on the KVM.
What would be the best IP KVM to look at for this?
Switched PDU And KVM/IP
APC seems to be the golden standard for switched PDU.
We are looking at a Tripplite B060 IP KVM
For all you KVM gurus, that have played with various brands, love to hear feedback on the various makes out there.
Avocent KVM With HP Adapters
I bouth a new Avocent DSR2161 KVMovIP Switchs and I'm having a little problem. Since I know Dell/HP/Avocent (and maybe some other else) use the same type of hardware to make this KVM Switchs, including the local System (OSCAR).
With this switch I bouth 16 KVM CAT5 PS/2 Adapters from HP.
When I connect them to the KVM Switch it shows a Green Light that means there is a cable in there but the orange light (I think it's the "act" light is turned off. In OSCAR no adapters appear.
When I plug in/out a adapter using a firmware v3 (latest Firmware from Avocent) it says (in debug mode):
rcmProcessRipPortStatusMsg: port 7
rcmRequestRipTableEntry: port 7, chan 1
rcmProcessRipTableMsg: old packet type!
RIP STATUS(RipTable) port:7 chan:1 In0 On1 Rip1 UA1 Up0 STS=71
rcmProcessRipTableMsg: port 7, chan 1, swChannels 0
rcmProcessRipTableMsg: ERROR RIP not found!
SecureLinx Spider KVM
There are 2 versions of this KVM
- one with USBs only http://www.provantage.com/lantronix-...1~7LANB01T.htm
- one with USB and PS/2 http://www.provantage.com/lantronix-...1~4LANB01R.htm
KVM Over IP For Multiple Servers
We are looking for KVM/IP solution for multiple server. Where we can add the users remotely and give temporary access to the server owners. Once they are done we remove them from access list. So it can be used by someone else.
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KVM-over-IP For BIOS Access
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I am considering purchasing a Belkin KVM/IP unit I found on craigslist, and I'm just wondering if anyone has any experience with them and can give me their opinion of them?
The one I am looking at is this model:
Startech SV1115IPEXT IP KVM
Wondering if anyone has used any of Startech's IP KVM products. In particular I am looking at the SV1115IPEXT here: [url]
What I am aiming for is a device that I can have remote hands just plug into a machine video, keyboard, mouse, and USE for remote image mounting (to simplify remote hands for the 'not so talented' 24-hour support in the DC).
Anyone have any experience using a IP KVM for this purpose? If so how well does it work for actually getting into the BIOS and booting off a remotely mounted image (considering the image is local on at least 100mbit ethernet)?
Who Offers KVM With Virtual Media?
I use Virtuozzo with layeredtech, and since I'm on the move anyway, thought I'd like to try out some different Virtualization products before the migration.
Allot of these products like bare-metal installs though... which is why I'm particularly looking for "virtual media" on the KVM.