virt September 2020

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10 participants
3 discussions

CentOS 8 Install as DOMU in PV Environment
by Niklas Anderson 28 Sep '20

28 Sep '20

All, I have successfully installed CentOS 7 on a PV environment, and have been trying to see if I can can get a CentOS 8 install running. Hardware does not support virtualization extensions, hence the PV environment and I cant do HVM for the install then migrate. My understanding is that PV support is in the kernel, and that the distro of Linux shouldn't technically matter. But currently when trying to "PXEBoot" using a CentOS 8 kernel and ram image I get a near instant crash for an invalid kernel. I tried to get around the issue by using DOM0 kernel and Ram Disk for the install (DOM0 is Debian 10), having the boot progress until it reaches the following, looping ISCSI error: >[ OK ] Reached target Slices. > Starting Create Static Device Nodes in /dev... >[ OK ] Started iSCSI UserSpace I/O driver. >[ OK ] Started Setup Virtual Console. > Starting dracut cmdline hook... >[ OK ] Started Apply Kernel Variables. >[ OK ] Stopped iSCSI UserSpace I/O driver. > Starting iSCSI UserSpace I/O driver... I have also tried the CentOS 7 kernel Ram Disk with the same results. I even tried installing CentOS 7 clean, then upgrading in place (by unofficial and unsupported means) and was left with an error that pygrub couldnt find the partition with the kernel. Is this is a bug, or is PV just not supported? Or am I doing something wrong? Config for the install is below: ># Kernel paths for install >#kernel = "/var/opt/xen/ISO_Store/Centos8PXEBoot/vmlinuz" >kernel = "/vmlinuz" >#ramdisk = "/var/opt/xen/ISO_Store/Centos8PXEBoot/initrd.img" >ramdisk = "/initrd.img" >extra="modules=loop,squashfs console=hvc0" > ># Path to HDD and iso file >disk = [ > #'file:/vmdisk0,xvda,w' > 'format=raw, vdev=xvda, access=w, target=/dev/mapper/vg_1-virtualmachine', > ] > >extra="ksdevice= inst.repo=https://mirror.jaleco.com/centos/8.2.2004/isos/x86_64/ nameserver=1.1.1.1" > ># Network configuration >vif = ['bridge=xenbr0'] > >#DomU Settings >memory = 3072 >name = "centos-8.2" Thank you to all.

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Re: [CentOS-virt] CentOS-virt Digest, Vol 156, Issue 3
by Daniel Sichel 14 Sep '20

14 Sep '20

Make sure that the interface that you are bridging to is not a wireless interface otherwise it won't work. Very deep in the documentation about setting up KVM there is a warning about that it's something about how they initiate connections on a wireless interface is different than on a wired one and it breaks things in KVM bridging. Daniel Sichel ________________________________ From: CentOS-virt <centos-virt-bounces(a)centos.org> on behalf of centos-virt-request(a)centos.org <centos-virt-request(a)centos.org> Sent: Monday, September 14, 2020 5:00:03 AM To: centos-virt(a)centos.org <centos-virt(a)centos.org> Subject: CentOS-virt Digest, Vol 156, Issue 3 Send CentOS-virt mailing list submissions to centos-virt(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.cen… or, via email, send a message with subject or body 'help' to centos-virt-request(a)centos.org You can reach the person managing the list at centos-virt-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-virt digest..." Today's Topics: 1. Re: Centos + VM + public ip (Subscriber) 2. Re: Centos + VM + public ip (Soumya Bhowmik) ---------------------------------------------------------------------- Message: 1 Date: Sun, 13 Sep 2020 15:47:00 +0300 (EEST) From: Subscriber <ml-lists(a)agoris.net.ua> To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Subject: Re: [CentOS-virt] Centos + VM + public ip Message-ID: <1516494674.1906.1600001220556.JavaMail.zimbra(a)agoris.net.ua> Content-Type: text/plain; charset=utf-8 > Hi, > > I've got a dedicated server with OVH and I'd like to host a public VM. I'd like > Centos OS 7 or 8, I installed KVM already, I got the VM and bought the IP and > created a virtual mac id. I know I have to bridge it somehow but I can't seem > to find a proper tutorial. Do you know where to start? You can do next: 1) Create bridge interface (for example br0) on dedicated server. Associate this interface with your Ethernet interface and assign IP address to br0. 2a) When you would create VM add parameter --network=bridge:br0 to the virt-install in command line. Or smth similar if you create VM in another way. 2b) Or edit xml file for your VM and add or change config: <interface type='bridge'> <mac address='insert_you_virtual_mac_here'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </interface> 3) Inside the VM assign real/public IP to you Ethernet (probably eth0) interface. That's all. If you have additional questions or you need more detail explanation you can write me directly. ------------------------------ Message: 2 Date: Sun, 13 Sep 2020 13:15:02 +0000 (UTC) From: Soumya Bhowmik <som3939(a)yahoo.co.in> To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Subject: Re: [CentOS-virt] Centos + VM + public ip Message-ID: <868650482.1233750.1600002902917(a)mail.yahoo.com> Content-Type: text/plain; charset="utf-8" You can create bridge in CentOS 7 withbr command line tool. In case if CentOS 8, bridge can be created with nmcli, cockpit or nm-connection-editor.? Sent from Yahoo Mail on Android On Mon, 7 Sep 2020 at 9:54 PM, Yoram Halberstam<yoram.halberstam(a)gmail.com> wrote: Hi, I've got a dedicated server with OVH and I'd like to host a public VM. I'd like Centos OS 7 or 8, I installed KVM already, I got the VM and bought the IP and created a virtual mac id. I know I have to bridge it somehow but I can't seem to find a proper tutorial. Do you know where to start? Thanks _______________________________________________ CentOS-virt mailing list CentOS-virt(a)centos.org https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.cen…

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Centos + VM + public ip
by Yoram Halberstam 13 Sep '20

13 Sep '20

Hi, I've got a dedicated server with OVH and I'd like to host a public VM. I'd like Centos OS 7 or 8, I installed KVM already, I got the VM and bought the IP and created a virtual mac id. I know I have to bridge it somehow but I can't seem to find a proper tutorial. Do you know where to start? Thanks

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virt September 2020