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Re-booting into CentOS-7.2 - advice sought
by Timothy Murphy 30 Dec '15

30 Dec '15

I have a remote home server updated to CentOS-7.2.1511 (as stated in /etc/redhat-release) but I have not re-booted since the update. The machine is currently running kernel 3.10.0-229.11.1.el7.x86_64. I'm wondering if anyone has advice on any safety steps I can take before re-booting, so that in the event of failure I can give simple instructions to my daughter at the other end on how to get the system running? Any suggestions gratefully received. -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin

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weird usb/sound problem on C7
by Fred Smith 30 Dec '15

30 Dec '15

I'm running C7, fully up to date. I'm also running the MATE desktop (from epel) though the original installation was Gnome. a couple weeks ago my USB headset worked as both earphones and mic. today when I plug it in I get nothing. right-clicking on the speaker icon in the upper panel I can choose "sound preferences" (as an aside, how can I figure out what program that actually is? it has no help or about option) and in the "Hardware" tab it shows several devices. One of them is the 'Plantronics C320' and it is listed as "Disabled". As far as I know I've done nothing to make it disabled, can anyone advise me how to UN-disable it? I can't figure it out... since this isn't windoze, I'm not in the habit of rebooting every time something weird happens, but I'm wondering if that's the practical solution for this, or not. thanks for any advice Fred PS: Oh, regarding what program it is, what appears to be the same program also exists in the menus from the top panel under System/Preferences/ Hardware/Sound. It still doesn't identify itself, but if I right-click on it and choose add launcher to desktp, I can then right-click on it, choose Properties, and see it is "mate-volume-control". I'll do some searching on that name for advice, and if I turn up anything I'll post it here. -- ------------------------------------------------------------------------------- Under no circumstances will I ever purchase anything offered to me as the result of an unsolicited e-mail message. Nor will I forward chain letters, petitions, mass mailings, or virus warnings to large numbers of others. This is my contribution to the survival of the online community. --Roger Ebert, December, 1996 ----------------------------- The Boulder Pledge -----------------------------

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moving LDAP from one domain to another
by Dan Hyatt 29 Dec '15

29 Dec '15

Hello, I am moving LDAP from one domain to another We have moved off of a.wustl.edu network to b.school.edu network. I have searched vi /etc/nslcd.conf vi /etc/openldap/ldap.conf and removed all referances to "a" I restarted /etc/init.d/nscd restart this is redhat 6.7, and my ldap server is now ldap.b.wustl.edu:389 a.school.edu to b.school.edu I keep getting messages that Dec 29 14:50:19 linuscs133 nslcd[7438]: [709c39] ldap_start_tls_s() failed: Can't contact LDAP server (uri="ldap://ldap.a.wustl.edu/") Dec 29 14:50:19 linuscs133 nslcd[7438]: [709c39] failed to bind to LDAP server ldap://ldap.a.wustl.edu/: Can't contact LDAP server Dec 29 14:50:19 linuscs133 nslcd[7438]: [709c39] no available LDAP server found Dec 29 14:50:28 linuscs133 rpc.mountd[12501]: authenticated mount request from IP:833 for /vol/aggr1/filefs (/vol/aggr1) Dec 29 14:50:41 linuscs133 rpc.mountd[12501]: authenticated mount request from ... for /vol/aggr1/dsg_external_collab (/vol/aggr1) Dec 29 14:55:19 linuscs133 nslcd[7438]: [f48f70] ldap_start_tls_s() failed: Can't contact LDAP server (uri="ldap://ldap.a.wustl.edu/") Dec 29 14:55:19 linuscs133 nslcd[7438]: [f48f70] failed to bind to LDAP server ldap://ldap.a.school.edu/: Can't contact LDAP server Dec 29 14:55:19 linuscs133 nslcd[7438]: [f48f70] no available LDAP server found Where else is the a.wustl.edu domain set? Thanks in advance Dan

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KVM Network (NetworkManager) broken
by Günther J. Niederwimmer 29 Dec '15

29 Dec '15

Hello, CentOS 7.2 I have a bad big problem with my Server running KVM Client. I have the most time restarting (reboot) the system a not running network !!! my interfaces change the name from eth1 to ensX or a Interface is not starting? I mean I have all Situation tested with NetworkManager without NetworkManager but the problem exist!!! I have 4 Interfaces created on install ens10 ens11 eth0 eth1 this was created on install? have any a idea what is going wrong with centos Thanks for a answer, -- mit freundlichen Grüßen / best regards, Günther J. Niederwimmer

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firewalld services
by Robert Moskowitz 29 Dec '15

29 Dec '15

I am familiar with using commands like: firewall-cmd --permanent --add-service=http To enable firewalld services. I am also aware that this is through xml 'scripts' in: /usr/lib/firewalld/services/ But what I find interesting is what services are there and which are not. I went a'lookin with: grep "port=" /usr/lib/firewalld/services/*|more And found some like: http, https, imaps, smtp, and pop3s What I do not find are others that I would think are 'standard' like: pop3 (110) and imap (143) I can understand 587 not being included, but imap? I can always just add them with: firewall-cmd --permanent --add-port=587/tcp But I want to use the standard files. Perhaps because they are there. Have I missed how some are handled? thanks

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routing with 2 public ips
by Joey 28 Dec '15

28 Dec '15

Hello, i have a server with 2 public ips on 2 devices. I want that the request of incoming traffic dont use the default gateway. Incoming traffic sould be answered using the gateway of the incoming device Could i realize this with firewalld? Or directly iptables? Greeting J

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Perl DBI 1.52 on el6
by Erick Ocrospoma 28 Dec '15

28 Dec '15

Hello guys, I was told by the client to install Perl DBI version 1.52 on a el6 box, by default el6 branch comes with DBI version 1.6x, this version is AFAIK not the desired one. First I tried installing DBI 1.52 from some rpm package [1], which had some dependencies, Perl 5.8.8 and dbd.4.4.x, this last package was also present el6, so it made conflict and it was not possible to install DBI 1.52 from a rpm. Then, I downloaded version 1.52 [2], and tried to compiled it, but it failed while doing the make test. I'm not sure if it is not a problem, because while doing make, it did not show error/failure messages. Finally, it seems I'd have to compile Perl 5.8.8 by hand, and then try to add DBI module also. Is this possible to install it safely and make it coexist with default Perl version (5.10.1) in el6 ? I'm also writing to DBI user list, about make test failure messages. But maybe, I guess, it is failing because it is not supported by Perl 5.10.1 and Perl 5.8.8 does. No clue about this, in my opinion it should compile with Perl 5.10.1 Regards. -- Erick. --- IRC : zerick Blog : http://zerick.me About : http://about.me/zerick Linux User ID : 549567

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Fiber Channel target with CentOS 6.7?
by Joacim Melin 28 Dec '15

28 Dec '15

Hi all, I've been googling for this for a day now and I can't seem to find a coherent structured way to build a fiber channel storage box where CentOS 6.7 is used both at the fiber channel target and initiator ends. My Brocade HBA:s are installed and the driver loads just fine in both boxes. Any ideas, pointers or URL:s are more than welcome. Thanks, Joacim

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CentOS 7 pcp-pmda-nvidia-gpu SELinux problems
by David O'Shea 28 Dec '15

28 Dec '15

Hi all, I installed Performance Co-Pilot 3 days ago, and installed the nVidia PMDA according to the instructions at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/ht… and was able to view metrics about my video card using pmchart. I then played around a little with the lmsensors PMDA (but it doesn't look too useful to me - it doesn't support my sensors, and I think it's for a 2.x kernel). After not looking at PCP at all for a few days, today I tried using pmchart to look at the nVidia metrics again but they were unavailable, and after checking /var/log/messages I found SELinux complaints. After a few iterations of the suggested 'grep pmdanvidia /var/log/audit/audit.log | audit2allow -M [...]', 'semodule -i [...].pp', restarting the PCP service, getting new SELinux errors, going back to step 1, I ended up with this content in the .te file: """ module doshea-selinux-pcp-pmda-nvidia-gpu 1.0; require { type xserver_misc_device_t; type pcp_pmcd_t; class capability sys_admin; class chr_file { read write ioctl open }; } #============= pcp_pmcd_t ============== allow pcp_pmcd_t self:capability sys_admin; #!!!! This avc is allowed in the current policy allow pcp_pmcd_t xserver_misc_device_t:chr_file { read write ioctl open }; """ I don't get why this worked 3 days ago and not today. I haven't installed many packages in the meantime. Should I file a bug somewhere about this? I don't know much about SELinux - I have a slight ability to edit those .te files and I think I remember what to do with them afterwards - but it seems like the sys_admin capability is pretty significant to be granting. Is there any way to work out why that's needed? Thanks in advance, David

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Network services start before network is up since migrating to 7.2
by Sylvain CANOINE 28 Dec '15

28 Dec '15

Hello all, I updated two of my servers to CentOS 7.2 (1511) two days ago, and since, on one of them, the network services are started (and fail to start) before the network interfaces are online. Parts of "journalctl" after the last reboot : déc. 17 10:21:44 myserver kernel: NET: Registered protocol family 40 déc. 17 10:21:45 myserver sshd[700]: error: Bind to port 22 on 172.20.XX.XX failed: Cannot assign requested address. déc. 17 10:21:45 myserver sshd[700]: fatal: Cannot bind any address. déc. 17 10:21:45 myserver systemd[1]: sshd.service: main process exited, code=exited, status=255/n/a déc. 17 10:21:45 myserver systemd[1]: Unit sshd.service entered failed state. déc. 17 10:21:45 myserver systemd[1]: sshd.service failed. déc. 17 10:21:45 myserver sssd[729]: Starting up déc. 17 10:21:45 myserver kernel: nf_conntrack version 0.5.0 (16384 buckets, 65536 max) déc. 17 10:21:34 myserver systemd[1]: Time has been changed déc. 17 10:21:35 myserver iptables.init[699]: iptables: Applying firewall rules: [ OK ] déc. 17 10:21:35 myserver systemd[1]: Started IPv4 firewall with iptables. déc. 17 10:21:35 myserver systemd[1]: Starting LSB: Bring up/down networking... déc. 17 10:21:35 myserver network[790]: Activation de l'interface loopback : [ OK ] déc. 17 10:21:36 myserver httpd[686]: (99)Cannot assign requested address: AH00072: make_sock: could not bind to address 172.19.XX.XX:443 déc. 17 10:21:36 myserver httpd[686]: no listening sockets available, shutting down déc. 17 10:21:36 myserver httpd[686]: AH00015: Unable to open logs déc. 17 10:21:36 myserver systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE déc. 17 10:21:36 myserver kernel: vmxnet3 0000:03:00.0 ens160: intr type 3, mode 0, 2 vectors allocated déc. 17 10:21:36 myserver kernel: vmxnet3 0000:03:00.0 ens160: NIC Link is Up 10000 Mbps déc. 17 10:21:36 myserver kill[924]: kill: cannot find process "" déc. 17 10:21:36 myserver systemd[1]: httpd.service: control process exited, code=exited status=1 déc. 17 10:21:36 myserver systemd[1]: Failed to start The Apache HTTP Server. déc. 17 10:21:36 myserver systemd[1]: Unit httpd.service entered failed state. déc. 17 10:21:36 myserver systemd[1]: httpd.service failed. déc. 17 10:21:36 myserver postfix/postfix-script[959]: starting the Postfix mail system déc. 17 10:21:36 myserver postfix/master[961]: daemon started -- version 2.10.1, configuration /etc/postfix déc. 17 10:21:36 myserver systemd[1]: Started Postfix Mail Transport Agent. déc. 17 10:21:36 myserver snmpd[704]: Turning on AgentX master support. déc. 17 10:21:36 myserver snmpd[704]: Error opening specified endpoint "udp:172.19.XX.XX:161" déc. 17 10:21:36 myserver snmpd[704]: Server Exiting with code 1 déc. 17 10:21:36 myserver systemd[1]: snmpd.service: main process exited, code=exited, status=1/FAILURE déc. 17 10:21:36 myserver systemd[1]: Failed to start Simple Network Management Protocol (SNMP) Daemon.. déc. 17 10:21:36 myserver systemd[1]: Unit snmpd.service entered failed state. déc. 17 10:21:36 myserver systemd[1]: snmpd.service failed. (...) déc. 17 10:21:38 myserver network[790]: Activation de l'interface ens160 : [ OK ] déc. 17 10:21:38 myserver kernel: vmxnet3 0000:0b:00.0 ens192: intr type 3, mode 0, 2 vectors allocated déc. 17 10:21:38 myserver kernel: vmxnet3 0000:0b:00.0 ens192: NIC Link is Up 10000 Mbps déc. 17 10:21:39 myserver ntpd[694]: Listen normally on 1 ens160 172.19.XX.XX UDP 123 déc. 17 10:21:39 myserver ntpd[694]: new interface(s) found: waking up resolver déc. 17 10:21:40 myserver ntpd[694]: 0.0.0.0 c61c 0c clock_step +11.002914 s déc. 17 10:21:51 myserver ntpd[694]: 0.0.0.0 c614 04 freq_mode déc. 17 10:21:51 myserver systemd[1]: Time has been changed déc. 17 10:21:51 myserver network[790]: Activation de l'interface ens192 : [ OK ] déc. 17 10:21:51 myserver systemd[1]: Started LSB: Bring up/down networking. déc. 17 10:21:51 myserver systemd[1]: Reached target Network is Online. déc. 17 10:21:51 myserver systemd[1]: Starting Network is Online. déc. 17 10:21:51 myserver systemd[1]: Reached target Multi-User System. déc. 17 10:21:51 myserver systemd[1]: Starting Multi-User System. déc. 17 10:21:51 myserver systemd[1]: Starting Update UTMP about System Runlevel Changes... déc. 17 10:21:51 myserver systemd[1]: Started Stop Read-Ahead Data Collection 10s After Completed Startup. déc. 17 10:21:51 myserver systemd[1]: Started Update UTMP about System Runlevel Changes. déc. 17 10:21:51 myserver systemd[1]: Startup finished in 650ms (kernel) + 2.623s (initrd) + 13.647s (userspace) = 16.922s. I found a workaround, by replacing "After=network.target" by "After=network-online.target" is the failing services' units, but I want to understand what is the root problem, and what is the difference between my two servers... And by now, I found nothing. Got an idea ? Sylvain CANOINE. Pensez ENVIRONNEMENT : n'imprimer que si ncessaire

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