2010/8/17 Moray Henderson <Moray.Henderson@xxxxxxxxxxxxxxxx>: > brem belguebli wrote: >>Hi there, >> >>I may be addressing this to the wrong ML ? >> >>If so could someone point me to the right one ? >> >>Thanks >> >>Brem >> >>2010/8/13 brem belguebli <brem.belguebli@xxxxxxxxx>: >>> Hi, >>> >>> I started anaconda with log=debug to see if I get more information: >>> The dns server option is really trapped but still the same message >>> complaining it can't look up hostname. >>> >>> 09:40:13 DEBUG : DHCPv4 eth0 - option routers default gateway 0: >>> 192.168.84.254 >>> 09:40:13 DEBUG : DHCPv4 eth0 - option domain-name-servers: >>> 09:40:13 DEBUG : DHCPv4 eth0 - domain-name-server 0: 10.146.0.11 >>> 09:40:13 DEBUG : DHCPv4 eth0 - domain-name-server 1: 10.146.36.11 >>> 09:40:13 DEBUG : DHCPv4 eth0 - option host-name: testVM >>> 09:40:13 DEBUG : nic_addr_send: add IFA_ADDRESS: 3 > 192.168.84.250/24 >>> >>> 09:40:13 DEBUG : nic_addr_send: add IFA_LOCAL: 3 192.168.84.250 >>> >>> 09:40:13 DEBUG : nic_addr_send: add address: 3 broadcast: >>192.168.84.255 >>> >>> 09:40:13 ERROR : no DNS servers, can't look up hostname >>> >>> Any hint or idea ? >>> >>> Thanks >>> >>> 2010/8/12 brem belguebli <brem.belguebli@xxxxxxxxx>: >>>> Hi, >>>> >>>> I'm systematically hiting the message "no DNS servers, can't look up >>>> hostname" while trying to build a hostname based ks file VM > install. >>>> >>>> The PXE server used is a Rhel 5.4 X86_64, the DHCP service is > offered >>>> by dnsmasq. >>>> The client is a VM expected to be installed with RHEL 5.4. >>>> >>>> When logging dsmasq, I can see that the dns server option (6) is > sent >>>> to the client as well as the hostname option (12). >>>> >>>> Below the dnsmasq log on the server >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: DHCP packet: transaction-id >>>> is 1664975136 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: Available DHCP range: >>>> 192.168.84.250 -- 192.168.84.251 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: Vendor class: anaconda >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: DHCPREQUEST(br0) >>>> 192.168.84.250 54:52:00:22:92:83 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: DHCPACK(br0) 192.168.84.250 >>>> 54:52:00:22:92:83 testVM >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: requested options: > 1:netmask, >>>> 28:broadcast, 3:router, 15:domain-name, >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: requested options: >>>> 6:dns-server, 12:hostname, 33:static-route >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: next server: 192.168.84.254 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: bootfile name: pxelinux.0 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: tags: known >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 1 option: >>>> 53:message-type 05 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: >>>> 54:server-identifier c0:a8:54:fe >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: >>>> 51:lease-time 00:00:1c:20 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: 58:T1 >>>> 00:00:0e:10 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: 59:T2 >>>> 00:00:18:9c >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: >>>> 1:netmask ff:ff:ff:00 >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: >>>> 28:broadcast c0:a8:54:ff >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 4 option: >>>> 3:router c0:a8:54:fe >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 6 option: >>>> 12:hostname 74:65:73:74:56:4d >>>> Aug 12 13:24:16 cmxi1152 dnsmasq[11759]: sent size: 8 option: >>>> 6:dns-server 0a:92:00:0b:0a:92:24:0b >>>> >>>> On client side (console ALT-F3 log) >>>> 11:24:15 INFO : getting kickstart file >>>> 11:24:15 INFO : sending dhcp request through device eth0 >>>> 11:24:15 INFO : requesting dhcp timeout 45 >>>> 11:24:15 INFO : Listening on LPF/eth0/54:52:00:22:93:83 >>>> 11:24:15 INFO : Sending on LPF/eth0/54:52:00:22:93:83 >>>> 11:24:15 INFO : Sending on Socket/fallback >>>> 11:24:15 INFO : DHCPDISCOVER on eth0 to 255.255.255.255 port 67 >>interval 5 >>>> 11:24:15 INFO : DHCPOFFER from 192.168.84.254 >>>> 11:24:15 INFO : DHCPREQUEST on eth0 to 255.255.255.255 port 67 >>>> 11:24:15 INFO : DHCPACK from 192.168.84.254 >>>> 11:24:15 INFO : bound to 192.168.84.250 -- renewal in 3052 > seconds. >>>> 11:24:15 INFO : DHCPv4 eth0 - obtained lease 192.168.84.250 >>>> 11:24:15 INFO : DHCPv4 eth0 - option subnet-mask: 255.255.255.0 >>>> 11:24:15 INFO : DHCPv4 eth0 - option subnet-mask - prefix_len: > 24 >>>> broadcast: 192.168.84.254 >>>> 11:24:15 INFO : DHCPv4 eth0 - option routers: >>>> 11:24:15 ERROR : no DNS servers, can't look up hostname >>>> >>>> Thanks >>>> >>>> Brem > > Try booting from a CentOS 5.4 LiveCD (or image). If that does not get a > working DNS configuration through DHCP either, you will have a better > environment for tracking it down. I'd suspect either firewall or > routing: if your VM really is getting 192.168.84.250 with default > gateway 192.168.84.254, can that gateway talk to the DNS server at > 10.146.0.11? The VM is able to reach the DNS server, no firewall issue, the install server NAT's all what is incoming from the VM to the outside. I even did a tcpdump port 53 on the install server (that is also the KVM host actually) to see if any DNS request is sent from the VM but none. > Is something on the way blocking the packets? Or maybe the > DNS server does not respond to requests from that subnet. cf above and below, client is NATED, DNS server answers the requests >If you have > access to the DNS server, check its logs, or run tcpdump to see if the > requests are arriving. "ip addr list" and "ip route list" will show > your networking configuration, and should also work in the Anaconda > shell window on Alt-F2. "cat /etc/resolv.conf" shows DNS configuration, > but I can't remember if that one works in Anaconda or not. > I'm not there yet , as I'm trying to build a per machine automated ks environment, so no shell on Alt-F2 as stage2 is not loaded. But when I cheat by entering the path to my ks file, I can get to the shell and cat /etc/resolv.conf gives me the expected nameservers and the expected domain entry , and I'm able then to request the DNS server then to resolve my client hostname. > > Moray. Thanks > "To err is human. To purr, feline" > Brem > > > > > _______________________________________________ > Anaconda-devel-list mailing list > Anaconda-devel-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/anaconda-devel-list > _______________________________________________ Anaconda-devel-list mailing list Anaconda-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/anaconda-devel-list
