similar to: 802.3ad + Centos 6 + KVM (bridging)

Hi all, Read many posts on the subject. Using 802.3ad. Few problems; Cannot ping some hosts on the network, they are all up. Cannot resolve via DNS which is one of the hosts that I cannot ping, internal nor external DNS hosts. Unplugging the NICS and plugging them back in will then not allow pining if the default d=gateway. When cold booting it somewhat works, some hosts are pingable while

Hi! I just upgraded a machine to 7.7.1908 and the default route is not being set on boot. This particular server has a bonded interface, and the corresponding configuration for the master is ( /etc/sysconfig/network-scripts/ifcfg-bond0): TYPE=Bond BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=yes NAME=bond0 DEVICE=bond0 ONBOOT=yes IPADDR=10.3.20.131 PREFIX=24

Hi all, Don't mean to double post as I sent this to the general Centos list. But, does any one have 802.3ad (mode 4) working on there Centos6 KVM setup? This would be a bridge+bond setup of course. If not possible, would I still bond the interfaces on the switch and then bond them in the guest rather then from within the hypervisor? - aurf

I have a Dell server with four bonded, gigabit interfaces. Bonding mode is 802.3ad, xmit_hash_policy=layer3+4. When testing this setup with iperf, I never get more than a total of about 3Gbps throughput. Is there anything to tweak to get better throughput? Or am I running into other limits (e.g. was reading about tcp retransmit limits for mode 0). The iperf test was run with iperf -s on the

Hi, Wondering if this is the proper bridging technique to use for Centos6+KVM; http://wiki.centos.org/HowTos/KVM Before I embark on this again, I would like to do it by the book. Thanks in advance, - aurf

Hi, Has any one had problems with mail clients were your DNS is like this; doman.com MX 50 mail.domain.com domain.com MX 100 mail2.domain.com domain.com CNAME www.domain.com -aurf

Hi, I've been using qemu-img resize for a few days now, seems fine. But if I du the VMs image file, it still shows the size before resizing. Inside that VM, the new size shows correctly. Is qemu-img resize the right tool for this? Once I qemu-img resize, I then use various fdisk/ LVM tools, etc... to resize within the VM just incase you all were wondering. - aurf

Hi, I'm VNCing into my KVM server and opening virt-manager. When trying to manage a newly created guest, I'm finding the mouse pointer stays on the outside of its virtual machine window. Any insight as to why its tracking so oddly? Thanks in advance, - aurf

Hi all, I've a particular host on my network that when I run; rexec -l username -p password remotehost command it just hangs. When I do; rexec -a -l username -p password remotehost command i get; Where are you? If I do; rexec -l username -p password localhostname (not just localhost but its actual name) command it works. Any ideas would be very appreciated. - aurf

Hi all, I've a 30TB hardware based RAID array. Wondering what you all thought of using ext4 over XFS. I've been a big XFS fan for years as I'm an Irix transplant but would like your opinions. This 30TB drive will be an NFS exported asset for my users housing home dirs and other frequently accessed files. - aurf

Hi all, I am migrating my Xen guests over to KVM. Does any one know were I can find said 5.1 kernel for download? - aurf

Hi all, Taken from this link; https://www.centos.org/modules/newbb/print.php?form=1&topic_id=34988&forum=55&order=ASC&start=0 Seems like I am having the same issue. I assigned my boot loader to be on /dev/md0 rather then the default of /dev/sda1 Does any one have insight to this? Thanks in advance. BTW, I have no swap partition and will do a swap file instead, easier to

Hi all, I never really paid attention to this but a file on an NFS mount is showing 64M in size, but when copying the file to a local drive, it shows 2.5MB in size. My NFS server is hardware Raided with a volume stripe size of 128K were the volume size is 20TB. My NFS clients are the same distro as the server being Centos. Is this due to my stripe size? Nuggets are appreciated. - aurf

Hi all, I noticed that my ssh logins to a particular server were taking up to 5 seconds to finally login. My tcpdump -vv weren't producing much output (not good) and my pings to and from that host were normal and almost identical to other hosts on my subnet that had no ssh login delay issues. Log files also showed nothing alarming. My hosts file was missing this at the very end of

Hi all, I'm migrating from my Cent 5.x LDAP server to Cent 6.x. But wondering if there are any advantages to the Directory Server package itself? Been using regular old LDAP server for years now. I manage it both via Webmin and command line as well as some tweaks to a Drupal module. The fail over has always sort of bothered me as the secondary LDAP servers pull vs being pushed to, at

Hi all, This topic is one that I am ignorant on and appreciate any guidance. My scenario; I have a wild card SSL installed on one of my CentOS boxes. As I understand it, this server was used as a sort of master when originally generating and receiving the wild card SSL cert (got the cert from GoDaddy BTW). So, now I must export some file(s) from that server so that I can import it/them to

Hi all, Just wondering if any one has experienced problems with trying to bridge a bonded interface with your KVM guests? There may be some ARP issues as per this link; https://bugzilla.redhat.com/show_bug.cgi?id=584872 Thanks in advance, - aurf

In honor of Xen Doc Day, I've put up some basic HOWTOs for setting up bridging on CentOS 6 and 7. I'm far from an expert, so I'd appreciate any feedback. The howtos can be found here: https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Networking6 https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Networking7 -George

Hi all, I read that XFS now has a max journal size of 2Gb rather than 128M. Is this correct? Thanks in advance, - aurf

Hello again, Been an interesting day. I'm attempting to use parted to create a partition on a 28TB volume which consists of 16x2TB drives configuired in a Raid 5 + spare, so total unformatted size is 28TB to the OS.. However upon entering parted, and making a gpt label, print reports back as follows; Model: Areca ARC-1680-VOL#000 (scsi) Disk /dev/sdc: 2199GB Sector Size