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34745 discussions

Unbound question: forward-zone and stub-zone
by C. L. Martinez 13 Feb '18

13 Feb '18

Hi all, I have a strange case with unbound ... I have defined a stub-zone to query to a secondary DNS server: stub-zone: name: "mydomain.org" stub-addr: 172.22.54.4 stub-zone: name: "54.22.172.in-addr.arpa." stub-addr: 172.22.54.4 ... but it doesn't works: any hostname or IP address is resolved. But if I use "forward": forward-zone: name: "mydomain.org" forward-addr: 172.22.54.4 forward-zone: name: "54.22.172.in-addr.arpa." forward-addr: 172.22.54.4 all works ok. Then, which is the real difference between stub and forward zones? According to unbound's man page, stub-zone is used for authority servers, which is my case. But forward zones are valid for not authority servers. On the other side: "unbound performs the recursive processing itself for stub zones." ¿¿¿??? How?? Why?? If I use a stub-zone, it is because I have an authority server with recursion for its SOA domain ... I don't understand ... What is the correct configuration? -- Greetings, C. L. Martinez

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Not able to sync mirror of Centos7 due to CRC checksum errors
by Soham Chakraborty 13 Feb '18

13 Feb '18

Hi, yesterday I was trying to create local mirror of CentOS7 using katello/pulp. I was receiving CRC checksum errors while attempting to sync the mirror. The particular error in question was: Feb 12 07:46:34 bazinga pulp: pulp_rpm.plugins.importers.yum.sync:INFO: [e2cd9930] Generating metadata databases. Feb 12 07:47:06 bazinga pulp: pulp_rpm.plugins.importers.yum.sync:ERROR: [e2cd9930] (23897-68256) CRC check failed 0x0 != 0xd61ac297L The full logs are available here: https://paste.fedoraproject.org/paste/lPnjaCFD6c~e22FtTedEKA I was under the impression that maybe somethinig is broken with katello/pulp and didn't pursue it further. Today, I attempted to sync it again with standalone pulp server (without katello/foreman/candlepin bits) and it failed again with same error. I tried a different mirror location as well, but received the same CRC check error: https://paste.fedoraproject.org/paste/O1ocILrTMEWkKDohOmXcaQ Then to test whether this is a problem with pulp or the upstream mirror, I decided to try to sync the CentOS6 repository from the same mirror and so far it is working. Can someone please tell me whether there could be any repodata corruption on the upstream repositories (as unlikely as it sounds)? Or anything which could prevent me from syncing the mirrors for internal consumption? Pulp installation is default as per https://docs.pulpproject.org/en/2.14/user-guide/installation/f23-.html Any thoughts? I am testing this on the 'generic/centos7' vagrant box. Thanks, -- Soham Chakraborty, Systems Administrator - EIS Pythian - Love your data chakraborty(a)pythian.com -- --

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A question about NBD kernel module...
by Raghuram Devarakonda 12 Feb '18

12 Feb '18

Hi, I would like to mount a device using NBD protocol on CentOS 7 but it looks like the module is not available by default in the kernel. Is there a way I can install it (like from a rpm somewhere)? I found instructions to build such a module but want to make sure that it is not already available in some repo before I go ahead with building. Any help is greatly appreciated. Thanks, Raghu

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libsmbclient conflict problem
by me＠tdiehl.org 12 Feb '18

12 Feb '18

Hi, I have a c-6 machine that I noticed the following on: (bugs pts10) # package-cleanup --problems Loaded plugins: fastestmirror, priorities, refresh-packagekit Package system-config-printer-libs-1.1.16-26.el6.x86_64 requires libsmbclient.so.0()(64bit) Package kdebase-runtime-libs-4.3.4-9.el6.x86_64 requires libsmbclient.so.0()(64bit) So then I ran: (bugs pts10) # yum install libsmbclient Loaded plugins: changelog, fastestmirror, priorities, refresh-packagekit Setting up Install Process Loading mirror speeds from cached hostfile * base: yumrepo * extras: yumrepo * fasttrack: yumrepo * remi: mirror.team-cymru.org * remi-php56: mirror.team-cymru.org * updates: yumrepo 138 packages excluded due to repository priority protections Resolving Dependencies --> Running transaction check ---> Package libsmbclient.x86_64 0:3.6.23-46el6_9 will be installed --> Processing Dependency: samba-winbind-clients = 3.6.23-46el6_9 for package: libsmbclient-3.6.23-46el6_9.x86_64 --> Processing Dependency: libwbclient.so.0()(64bit) for package: libsmbclient-3.6.23-46el6_9.x86_64 --> Running transaction check ---> Package samba-winbind-clients.x86_64 0:3.6.23-46el6_9 will be installed --> Processing Dependency: samba-winbind = 3.6.23-46el6_9 for package: samba-winbind-clients-3.6.23-46el6_9.x86_64 --> Running transaction check ---> Package samba-winbind.x86_64 0:3.6.23-46el6_9 will be installed --> Processing Dependency: samba-common = 3.6.23-46el6_9 for package: samba-winbind-3.6.23-46el6_9.x86_64 --> Running transaction check ---> Package samba-common.x86_64 0:3.6.23-46el6_9 will be installed --> Processing Conflict: samba4-common-4.2.10-12.el6_9.x86_64 conflicts samba-common < 3.9.9 --> Processing Conflict: samba4-winbind-4.2.10-12.el6_9.x86_64 conflicts samba-winbind < 3.9.9 --> Processing Conflict: samba4-winbind-clients-4.2.10-12.el6_9.x86_64 conflicts samba-winbind-clients < 3.9.9 --> Finished Dependency Resolution --> Finding unneeded leftover dependencies Found and removing 0 unneeded dependencies Error: samba4-winbind conflicts with samba-winbind-3.6.23-46el6_9.x86_64 Error: samba4-winbind-clients conflicts with samba-winbind-clients-3.6.23-46el6_9.x86_64 Error: samba4-common conflicts with samba-common-3.6.23-46el6_9.x86_64 You could try using --skip-broken to work around the problem ** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows: kdebase-runtime-libs-4.3.4-9.el6.x86_64 has missing requires of libsmbclient.so.0()(64bit) system-config-printer-libs-1.1.16-26.el6.x86_64 has missing requires of libsmbclient.so.0()(64bit) (bugs pts10) # I have the following samba packages installed: (bugs pts10) # rpm -qa samba4\* samba4-winbind-clients-4.2.10-12.el6_9.x86_64 samba4-4.2.10-12.el6_9.x86_64 samba4-client-4.2.10-12.el6_9.x86_64 samba4-common-4.2.10-12.el6_9.x86_64 samba4-winbind-4.2.10-12.el6_9.x86_64 samba4-libs-4.2.10-12.el6_9.x86_64 (bugs pts10) Can someone tell me what what I need to do to resolve the above conflicts? There does not seem to be a later version of libsmbclient available. Regards, -- Tom me(a)tdiehl.org

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Meltdown and Spectre
by isdtor 12 Feb '18

12 Feb '18

Does anyone know if Red Hat are working on backporting improved mitigation techniques and features from newer, 4.14.14+ kernels? $ grep . /sys/devices/system/cpu/vulnerabilities/* /sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI /sys/devices/system/cpu/vulnerabilities/spectre_v1:Vulnerable /sys/devices/system/cpu/vulnerabilities/spectre_v2:Vulnerable: Minimal generic ASM retpoline $

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CentOS 7 Cloud 16.0.4 Nova Security Update
by Henry Spanka 10 Feb '18

10 Feb '18

Hello, A security issue has been found in Nova 16.0.3 and a fix has been released in December, however I haven’t seen Nova 16.0.4 in the Cloud repositories yet. Is someone working on updating the nova packages? The issue allows users to consume all resources on a host which leads to a denial of service. See: https://docs.openstack.org/releasenotes/nova/pike.html <https://docs.openstack.org/releasenotes/nova/pike.html> Vulnerability ID: OSSA-2017-006 ----------------------------------------------------------------------------------------- Mit freundlichen Grüßen / With best regards Henry Spanka — myVirtualserver — Development Team GPG: 8BA3 14FE 3973 9E17 1D9E ADAE CEAB DAB5 5B47 0BC8

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Issues with NVidia video driver and CentOS
by Felipe Westfields 09 Feb '18

09 Feb '18

I'm having issues with a quad video card on CentOS. We have several systems on CentOS 6.8 and CentOS 6.9. The installed hardware is: Video card - Nvidia NVS quadro 440 PC - Dell OptiPlex 9020 Whenever you update the kernel, it kills the graphical interface. The system appears to lock up and freeze during a reboot, but you can still get into it with SSH, or, if you're at the console, control-alt-F2 gets you to a command prompt. If you exclude the kernel update when applying yum update, it is usually fine. If the kernel update is applied, and you roll back the update, that sometimes gets you back into the graphical console, but more likely than not, it won't. Not sure where to go with this. Any suggestions? FW

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Adjust type of rw in submit_bio from int to unsigned long
by wuzhouhui 09 Feb '18

09 Feb '18

Hi, I am a developer who worked on CentOS. Recently I am working on porting one of my block drivers from CentOS 6.x to CentOS 7.x. In newest kernel (kernel-3.10.0-693.17.1.el7) I found there is an issue in submit_bio()'s first argument: void submit_bio(int rw, struct bio *bio) The type of bi_rw of struct bio is unsigned long, and the number of enum rq_flags_bits also exceeds 32, so we should better using unsigned long for rw in submit_bio(), like: void submit_bio(unsigned long rw, struct bio *bio)

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OT: configuring xming to know putty's not in a std. location
by m.roth＠5-cent.us 08 Feb '18

08 Feb '18

Is there some way to do this? I've got the current putty (actually, putty-cac), pageant, and plink in my user's Downlods directory - neither he nor I have admin authority on his laptop, and Desktop support's teleworking today - but I can't seem to find a way to configure xming to look there for putty. Or is it start putty, *then* start xming? mark

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OT - pushing database updates to web browser
by Gary Stainburn 07 Feb '18

07 Feb '18

This is O/T apart from the fact that the server is Centos running Apache / Postgresql. I want to develop a real time (ish) dashboard type web page showring extracts of the contents of a table. I would like any changes that occur to be pushed to the web clients rather than have the clients poll the database. Based on the fact that I have not managed to come up with a successful Google search phrase I think this may not be possible, but just in case I thought I'd ask here. If it's not possible, can anyone suggest the most efficient / responsive polling techniques?

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