On 07/22/15 at 12:18pm, Minfei Huang wrote:
On 07/22/15 at 11:45am, Dave Young wrote:
> On 07/21/15 at 02:49pm, Minfei Huang wrote:
> > Kdump will parse the hostname to get the ip address, if hostname is
> > specfied in /etc/kdump.conf. We will get the ip address(ipv4 or ipv6,
> > according to the DNS server) by using "getent hosts".
> >
> > For now, it is more reasonable that we shall get all of the ip
> > address(including ipv4 and ipv6 address) which point to the hostname by
> > using "getent ahosts". And we will prefer to use the ipv4 address,
if
> > both ipv4 and ipv6 address work.
>
> Agreed that ipv4 first is better because it was tested well..
>
> >
> > The reason why we choose the ipv4 as preferred address is to solve the
> > issue kdump will fail to connect the hostname machine(parsed as ipv6
> > address), due to the DNS server is ipv4 address in 2nd kernel.
>
> Is there ipv6 dns in 1st kernel? Why only broken in 2nd kernel?
>
We support ipv6 address in beaker environment.
The hostname will fail to be parsed to ipv6 address, if the machine only
supports ipv6 address. The DNS server in beaker environment only
supports ipv4 address.
Ok, thanks, I have no other comments, feel free to send an update with
comments added for netmask.
Thanks
Minfei
> >
> > Signed-off-by: Minfei Huang <mhuang(a)redhat.com>
> > ---
> > dracut-module-setup.sh | 10 ++++++++--
> > 1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
> > index 039fe3b..703f66b 100755
> > --- a/dracut-module-setup.sh
> > +++ b/dracut-module-setup.sh
> > @@ -305,12 +305,18 @@ get_ip_route_field()
> > #$1: config values of net line in kdump.conf
> > #$2: srcaddr of network device
> > kdump_install_net() {
> > - local _server _netdev _srcaddr _route
> > + local _server _netdev _srcaddr _route _serv_tmp
> > local config_val="$1"
> >
> > _server=$(get_remote_host $config_val)
> >
> > - is_hostname $_server && _server=`getent hosts $_server | head -n 1
| cut -d' ' -f1`
> > + if is_hostname $_server; then
> > + _serv_tmp=`getent ahosts $_server | grep -v : | head -n 1`
> > + if [ -z "$_serv_tmp" ]; then
> > + _serv_tmp=`getent ahosts $_server | head -n 1`
> > + fi
> > + _server=`echo $_serv_tmp | cut -d' ' -f1`
> > + fi
> >
> > _route=`/sbin/ip -o route get to $_server 2>&1`
> > [ $? != 0 ] && echo "Bad kdump location: $config_val"
&& exit 1
> > --
> > 2.1.0
> >
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> >
> >
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