I first wrote my problem on stackoverflow thinking it was a Maven proxy software problem.
But I realised it was more a problem with my virtualization stack (libvirt 0.7.5-5ubuntu27.19 / kvm 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.16 on Ubuntu 10.04.3 LTS).
Here is the libvirt network configuration of my VM :
<interface type='bridge'> <mac address='52:54:00:0f:30:ea'/> <source bridge='br0'/> </interface>
/etc/network/interfaces part for
auto eth3 iface eth3 inet manual auto br0 iface br0 inet static address 192.168.1.200 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.254 bridge_ports eth3 bridge_stp off bridge_maxwait 0
So here is the problem : sometimes, when a maven client is trying to build a project and downloads plenty of jars from the VM running the maven proxy, it stucks while downloading one of them :
Downloading: http://192.168.1.213:8081/artifactory/repo/org/apache/apache/9/apache-9.pom Downloaded: http://192.168.1.213:8081/artifactory/repo/org/apache/apache/9/apache-9.pom (15 KB at 14.0 KB/sec) Downloading: http://192.168.1.213:8081/artifactory/repo/org/apache/maven/plugins/maven-release-plugin/2.2.1/maven-release-plugin-2.2.1.jar 5 KB
I've eliminated the software problem because I configured a similar server on another real computer and it works.
I've tried switching
0 reading Network freezes with KVM/libvirt and ip_forward = 1 without result.
I've tried adding
CAP_NET_ADMIN capability reading KVM/Networking on ubuntu wiki without results.
I've tried to configure my
br0 adding those properties in
/etc/network/interfaces without results :
bridge_fd 9 bridge_fd 0 bridge_hello 2 bridge_maxage 12
I've tried to change the model of the virtual network interface reading that blog entry, adding
<model type='e1000'/> inside the
<interface> tag, and I finally had better results (but it still blocked sometimes - even if it's less often). Better also with
I've tried to capture the exchange between my client and the VM, and it seems to stuck always when TCP connection client send a
[ACK] with a
Len=0. Here is the exchange captured by Wireshark.
It seems I have the same bug as this one (on launchpad).
Can somebody point me to an even better libvirt / KVM configuration ?