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Re: [Xen-devel] Patching error while setting up COLO

On 02/25/2016 01:17 PM, Yu-An(Victor) Chen wrote:

I am trying to set up COLO by following this

I was able to follow the step up to

$git am ~/ColoPatchForQemu/*.patch

When I try to run the above command, I got the following error:

error: patch failed: include/hw/xen/xen_common.h:186
error: include/hw/xen/xen_common.h: patch does not apply
error: patch failed: xen-hvm.c:85
error: xen-hvm.c: patch does not apply
Patch failed at 0018 Revert "Xen: Use the ioreq-server API when available"
The copy of the patch that failed is found in:

Please let me know how I can solve this patching error. Thank you!

Hi Victor

Sorry for this. Since we have no privilege to update the Wiki for a long time so most contents of this page are dated : (

Anyway i'll write down detail steps here for colo on XEN.

- Hardware
There is at least one directly connected nic to forward the network requests from primary to secondary vm. The directly connected nic must not be used by any other purpose. If your guest has more than one nic, you should have directly connected nic for each guest nic. If you don't have enouth directly connected nic, you can use vlan.

- Dom0
1. Kernel with dom0 support
2. kernel module
   libnl-tools >= 3.0.
*Note*: If your host os has OEM-released xen tools, *MUST* uninstall it first.

- Guest
Only HVM guest(without pv extensions) is supported now. If you want to use OEM released guest os, please use SUSE(we use "SUSE Linux Enterprise Server 11" currently). REDHAT and Ubuntu is not supported now because I don't find any way to disable pv extensions. If you want to use REDHAT or Ubuntu, you need to build the newest kernel which has the parameter xen_nopv.

- Network link topology
ref: http://wiki.xenproject.org/wiki/COLO_-_Coarse_Grain_Lock_Stepping

-  Test environment prepare

On both Primary/Secondary hosts:
cd ~
git clone https://github.com/wencongyang/colo-proxy
git clone https://github.com/macrosheep/iptables.git
git clone https://github.com/torvalds/linux
git clone https://github.com/wencongyang/qemu-colo
git clone https://github.com/wencongyang/xen

2. Prepare host kernel for Dom0
colo-proxy kernel module need cooperate with linux kernel. You should patch kernel with ~/colo-proxy/colo-patch-for-kernel.patch
1) cd ~/colo-proxy/; git checkout 405527cbfa9f
2) cd ~/linux/; git checkout v4.0; git am ~/colo-proxy/colo-patch-for-kernel.patch 3) cp /boot/config-3.0.76-0.11-xen .config; make menuconfig to config your kernel support Dom0.
Ref: http://wiki.xenproject.org/wiki/Mainline_Linux_Kernel_Configs
4) make -j8; make modules_install; make install
5) reboot

3. build colo-proxy
1) cd ~/colo-proxy/; git checkout 405527cbfa9f; make; make install

4. build iptables
1) cd iptables; ./autogen.sh; ./configure --prefix=/usr/ --libdir=/usr/lib64; make; make install

5. build qemu-colo
1) cd ~/qemu-colo/; git checkout colo-xen-v2
./configure --enable-xen --target-list=x86_64-softmmu \
--extra-cflags="-I$path_to_xen_source/tools/include -I$path_to_xen_source/tools/libxc -I$path_to_xen_source/tools/xenstore" \ --extra-ldflags="-L$path_to_xen_source/tools/libxc -L$path_to_xen_source/tools/xenstore"
make -j4

6. build xen
1) cd ~/xen/; git checkout colo_v10
./configure --enable-debug
touch tools/libxl/libxlu_disk_l.l
touch tools/libxl/libxlu_cfg_l.l
make dist-xen -j8
make dist-tools -j8
make install-xen -j8
make install-tools -j8

7. configure /boot/grub/menu.list to support xen, then reboot

[ Run COLO ]

on primary:
rm -f /var/log/xen/*
rm -f /var/lib/xen/userdata-d.*
service xencommons start
modprobe nf_conntrack_ipv4
modprobe xt_PMYCOLO sec_dev=eth1

on secondary:
rm -f /var/log/xen/*
rm -f /var/lib/xen/userdata-d.*
service xencommons start
modprobe xt_SECCOLO
tmp_disk_size=`./qemu-colo/qemu-img info $local_img |grep 'virtual size' |awk '{print $3}'`
rm -rf /mnt/ramfs/*
umount /mnt/ramfs/
rm -rf /mnt/ramfs/
mkdir /mnt/ramfs
function create_image()
/root/xie/xen/tools/qemu-xen-dir/qemu-img create -f qcow2 $1 $tmp_disk_size
function prepare_temp_images()
    grep -q "^none /mnt/ramfs ramfs" /proc/mounts
    if [[ $? -ne 0 ]]; then
        mount -t ramfs none /mnt/ramfs/ -o size=2G

    if [[ ! -e $active_disk ]]; then
        create_image $active_disk

    if [[ ! -e $hidden_disk ]]; then
        create_image $hidden_disk

2. on primary
xl cr hvm_nopv_colo
sleep 10
xl pause hvm_nopv_colo
xl remus -c -u hvm_nopv_colo

hvm_nopv_colo attached.

That's all, good luck ; )



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