Curious SL not resolve DNS.
Today I find a curious case, SL has a strange behavior with dns. My terminal command: [root@intern ~]# cat /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 [root@intern ~]# ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 64 bytes from 8.8.8.8: icmp_seq=1 ttl=44 time=62.6 ms 64 bytes from 8.8.8.8: icmp_seq=2 ttl=44 time=74.5 ms 64 bytes from 8.8.8.8: icmp_seq=3 ttl=44 time=42.6 ms 64 bytes from 8.8.8.8: icmp_seq=4 ttl=44 time=66.9 ms [root@intern ~]# ping priona.net ping: unknown host priona.net [root@intern ~]# nslookup priona.net Server:8.8.8.8 Address:8.8.8.8#53 Non-authoritative answer: Name:priona.net Address: 146.255.96.119 [root@intern ~]# host prina.net prina.net has address 72.47.224.79 prina.net mail is handled by 10 mail.prina.net. [root@intern ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination [root@intern ~]# cat /etc/redhat-release Scientific Linux release 6.2 (Carbon) [root@intern ~]# yum update Loaded plugins: remove-with-leaves, security http://ftp.halifax.rwth-aachen.de/scientificlinux/6.2/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - Couldn't resolve host ' ftp.halifax.rwth-aachen.de' Trying other mirror. ftp://ftp.halifax.rwth-aachen.de/scientificlinux/6.2/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - Couldn't resolve host ' ftp.halifax.rwth-aachen.de' Trying other mirror. http://gd.tuwien.ac.at/opsys/linux/scientific/6.2/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - Couldn't resolve host 'gd.tuwien.ac.at' Trying other mirror. ftp://gd.tuwien.ac.at/opsys/linux/scientific/6.2/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - Couldn't resolve host 'gd.tuwien.ac.at' Trying other mirror. http://mirror.cpsc.ucalgary.ca/mirror/scientificlinux.org/6.2/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - Couldn't resolve host 'mirror.cpsc.ucalgary.ca ' Trying other mirror. Any idea?
Re: Curious SL not resolve DNS.
Hi Pere Casas! On 2012.08.13 at 11:18:16 +0200, Pere Casas wrote next: [root@intern ~]# ping priona.net ping: unknown host priona.net [root@intern ~]# nslookup priona.net Server:8.8.8.8 Address:8.8.8.8#53 Non-authoritative answer: Name:priona.net Address: 146.255.96.119 Unlike host, dig and nslookup, which are part of BIND suite and use BIND resolver, ping uses system-wide resolver provided by glibc (libresolv). They can behave differently. First thing worth checking if you are running nscd - and if you are, its configuration on domain name caching. Check output of pgrep nscd - if you see number (pid), you are running nscd. If you are, check if advices from http://www.eyrie.org/~eagle/notes/solaris/dns-cache.html will help. If you are not, well, such situation can happen, but I can't remember any more possible reasons. At very least, you should check if your glibc isn't broken (rpm -qV glibc will do for a check) and if strace ping priona.net writes anything suspicious. -- Vladimir
Re: Curious SL not resolve DNS.
[root@intern ~]# cat /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 ... [root@intern ~]# ping priona.net ping: unknown host priona.net Check your /etc/nsswitch.conf file and make sure dns is included in the hosts: line. - Bluejay Adametz The best thing about the future is that it comes one day at a time. - Abraham Lincoln -- NOTICE: This message, including any attachments, is only for the use of the intended recipient(s) and may contain confidential and privileged information, or information otherwise protected from disclosure by law. If the reader of this message is not the intended recipient, you are hereby notified that any use, disclosure, copying, dissemination or distribution of this message or any of its attachments is strictly prohibited. If you received this message in error, please contact the sender immediately by reply email and destroy this message, including all attachments, and any copies thereof.
Re: sl 6.2 can't reboot or shutdown, may something wrong with iptables
On Sat, 11 Aug 2012, Tuan Pengfei wrote: --14dae9340525f877db04c6f82b7b Content-Type: text/plain; charset=ISO-8859-1 I am sorry, i forget to give my system info: Linux localhost.localdomain 2.6.32-220.23.1.el6.x86_64 #1 SMP Mon Jun 18 09:58:09 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux Lenovo g430 This is my first time i use sl. It runs good with rhel 6.0 slackware 13.xx and fedora 1x these years. On Sat, Aug 11, 2012 at 3:07 PM, Tuan Pengfei pengfeit...@gmail.com wrote: Hello everyone, i have something worried me, my new sl 6.2 can't reboot or shutdown, ie. can't run into level 0. The screen prints(as i remmeber ...): stopping iptables: error lldpad can't connect to just like this, so i set iptables and ip6tables service off with What setting are you using in iptables ? cat /etc/sysconfig/iptables -Connie Sieh chkconfig, yet it is resolved. it never happens. But it is not a good solution. Anyone here can provide a reason of this problem and a good solution? Thanks. --14dae9340525f877db04c6f82b7b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I am sorry, i forget to give my system info:brLinux localhost.localdomain= 2.6.32-220.23.1.el6.x86_64 #1 SMP Mon Jun 18 09:58:09 CDT 2012 x86_64 x86_= 64 x86_64 GNU/LinuxbrLenovo g430brThis is my first time i use sl. It ru= ns good with rhel 6.0 slackware 13.xx and fedora 1x these years.br brbrdiv class=3Dgmail_quoteOn Sat, Aug 11, 2012 at 3:07 PM, Tuan Pe= ngfei span dir=3Dltrlt;a href=3Dmailto:pengfeit...@gmail.com; target= =3D_blankpengfeit...@gmail.com/agt;/span wrote:brblockquote clas= s=3Dgmail_quote style=3Dmargin:0 0 0 .8ex;border-left:1px #ccc solid;pad= ding-left:1ex Hello everyone, i have something worried me, my new sl 6.2 can#39;t reboot= or shutdown, ie. can#39;t run into level 0. The screen prints(as i remmeb= er ...):brquot;stopping iptables:br=A0error lldpad can#39;t connect t= o br =A0brquot;brjust like this, so i set iptables and ip6tables servic= e off with chkconfig, yet it is resolved. it never happens. But it is not a= good solution.brAnyone here can provide a reason of this problem and a g= ood solution?br Thanks.br /blockquote/divbr --14dae9340525f877db04c6f82b7b--
Re: Curious SL not resolve DNS.
Oh! I do not remember changing this line. This is my problem !!! Thnks Bluejay Adametz and Vladimir Mosgalin !! 2012/8/13 Bluejay Adametz blue...@fujifilm.com [root@intern ~]# cat /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 ... [root@intern ~]# ping priona.net ping: unknown host priona.net Check your /etc/nsswitch.conf file and make sure dns is included in the hosts: line. - Bluejay Adametz The best thing about the future is that it comes one day at a time. - Abraham Lincoln -- NOTICE: This message, including any attachments, is only for the use of the intended recipient(s) and may contain confidential and privileged information, or information otherwise protected from disclosure by law. If the reader of this message is not the intended recipient, you are hereby notified that any use, disclosure, copying, dissemination or distribution of this message or any of its attachments is strictly prohibited. If you received this message in error, please contact the sender immediately by reply email and destroy this message, including all attachments, and any copies thereof.
Home page links 6.3 announcements to 6.2 directories.
FYI, almost all of the 6.3 links on the home page of scientificlinux.org link to 6.2 download directories. ~ Nathan
Re: [SCIENTIFIC-LINUX-USERS] Home page links 6.3 announcements to 6.2 directories.
On 08/13/2012 02:30 PM, Nathan wrote: FYI, almost all of the 6.3 links on the home page of scientificlinux.org link to 6.2 download directories. ~ Nathan Fixed. The live discs are not yet available, so those links still point to 6.2. Thanks for noticing! Pat -- Pat Riehecky Scientific Linux Developer
