Discuss February 2013

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203 participants
197 discussions

Nagios NRPE IPv6
by Tilman Schmidt 26 Feb '13

26 Feb '13

On my network management server I have Name : nagios-plugins-nrpe Arch : x86_64 Version : 2.13 Release : 1.el6 Size : 38 k Repo : installed From repo : epel To my dismay I noticed that this doesn't seem to support IPv6: [ts@bombur ~]$ host galadriel.example.com galadriel.example.com has IPv6 address 2001:db8:f004:8::32 [ts@bombur ~]$ /usr/lib64/nagios/plugins/check_nrpe -n -H galadriel.example.com Invalid host name 'galadriel.example.com' [ts@bombur ~]$ /usr/lib64/nagios/plugins/check_nrpe -n -H 2001:db8:f004:8::32 Invalid host name '2001:db8:f004:8::32' [ts@bombur ~]$ (With obvious sanitization.) What gives? -- Tilman Schmidt Phoenix Software GmbH Bonn, Germany

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Re: [CentOS] running yum update on remote servers
by Tilman Schmidt 25 Feb '13

25 Feb '13

Am 25.02.2013 23:36, schrieb Reindl Harald: > > Am 25.02.2013 23:34, schrieb Tilman Schmidt: >> Am 25.02.2013 15:56, schrieb m.roth(a)5-cent.us: >>> Robert Moskowitz wrote: >> >>>> Then there is the actual update. I learned long ago NOT to run yum over >>>> an SSH connection, as WHEN that connection breaks in the middle of an >>>> update, you can have quite a problem to clean up. All I have done >>> >>> That sounds, to me, as though you have very serious communications issues >>> that need to be solved, and yesterday. We've used ssh here, and at my >>> previous two? three? contracts, for years, and almost *never* have an ssh >>> connection break. >> >> It does happen. SSH is not as forgiving to network glitches as one >> would wish sometimes. A firewall that drops idle or long-running >> TCP connections, a DSL link doing its daily PPPoE disconnect at an >> inopportune moment, a VPN tunnel dropping, a hole in UMTS coverage, >> have all killed a SSH connection for me one time or another > > and that is why "screen" was invented Well, not quite. IIRC screen is older than SSH and was actually invented to switch between multiple screens on a text mode terminal attached either via a modem or a null modem cable. But I agree that it comes in handy for this scenario, too. > everybody doing a yum-upgarde over WAN directly on SSH > instead use screen is a foll and should not maintain servers Sure. Whatever a "foll" is supposed to be ... :-) -- Tilman Schmidt Phoenix Software GmbH Bonn, Germany

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Re: [CentOS] running yum update on remote servers
by Robert Moskowitz 25 Feb '13

25 Feb '13

On 02/25/2013 02:17 PM, Reindl Harald wrote: > > Am 25.02.2013 19:35, schrieb Robert Moskowitz: >> For example, an apache update MAY require that I first check what it >> will do to http.conf. > NOT ON RHEL/CENTOS > > there are no major upgrades with changing API/ABI/Config > that is why it is called "enterprise distribution" I did some archive digging and it was shorewall that got me on this. And then I went into conservative mode, as this impacted my firewall on Centos. Obviously overly conservative. I am learning more, and this time, for example, I am trying hard NOT to edit http.conf, instead to put some http.d/00-init-nn.conf files together so I can know as much as possible what I have added. I don't know yet if that can be done. I have done this on my test mail server. Will see if I can do it on my web server.

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Re: [CentOS] mixing MX and CNAME
by aurfalien 25 Feb '13

25 Feb '13

On Feb 25, 2013, at 9:39 AM, Reindl Harald wrote: > > > Am 25.02.2013 17:56, schrieb aurfalien: >> >> On Feb 25, 2013, at 8:11 AM, Reindl Harald wrote: >> >>> >>> >>> Am 25.02.2013 17:06, schrieb aurfalien: >>>> Hi, >>>> >>>> Has any one had problems with mail clients were your DNS is like this; >>>> >>>> doman.com MX 50 mail.domain.com >>>> domain.com MX 100 mail2.domain.com >>>> >>>> domain.com CNAME www.domain.com >>> >>> you CAN NOT do that >>> >>> domain.com must be a A-record >>> is so, nothing can change this and named will refuse to start if you do so >> >> Sorry, should have clarified that an A record does exist for www.domain.com > > and why do you not make the A-record for "domain.com" and the > CNAME for "www.domain.com" to "domain.com" as virtually everybody > does who has mail and web services on a domain? > So A records and MX record mixes can coexist? For example; domain.com A 1.2.3.4 www.domain.com CNAME domain.com And leave MX as is. This should work? - aurf

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Re: [CentOS] UC centos 5 with xfs root?
by Rushton Martin 25 Feb '13

25 Feb '13

There are 3 issues here: Grub, the kernel and RedHat. 1) Grub won't run in an XFS /boot partition, but will happily run xfs_state1_5 to boot from an XFS root partition. 2) The kernel has supported XFS quite happily since at least 2005, I am looking at an SGI Propack 4 manual of February that year and it states that SLES 9 SP 1 contains the kernels with XFS support. 3) May be an issue. I'm just closing down an old Altix (2004 vintage) and that has always run XFS for everything except /boot. In the early days it used RedHat, but SGI's software included a patched kernel. Later on it ran SuSE Linux out-of-the-box. For compatibility I've configured the x86 machines with OpenSuSE 9 onwards as EXT2 for /boot and everything else on XFS. Sorry to mention SuSE on a CentOS NG, but that's where my experience lay at that time! Regards, Martin -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of James Pearson Sent: 24 February 2013 13:20 To: CentOS mailing list Subject: Re: [CentOS] centos 5 with xfs root? John R Pierce wrote: > On 2/23/2013 7:40 AM, Eero Volotinen wrote: > >>Is it possible to install centos 5 with xfs root and how to do it? > > > Wait. I just realized you're asking about centos *5* and XFS? > > I wouldn't use XFS with EL5, root or not.... the XFS support was very > preliminary, the base kernel was just too old. That's not completely true - XFS existed in the Linux kernel before EL5 - however, RedHat's support of XFS was added to the EL 5.4 kernel with a backport of a contemporary XFS release - and has had fixes added in subsequent EL5 kernels However, I would agree that unless you have a very good reason for staying with CentOS 5, then using CentOS 6 would be better - regardless of XFS support James Pearson _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. QinetiQ may monitor email traffic data and also the content of email for the purposes of security. QinetiQ Limited (Registered in England & Wales: Company Number: 3796233) Registered office: Cody Technology Park, Ively Road, Farnborough, Hampshire, GU14 0LX http://www.qinetiq.com.

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Re: [CentOS] mixing MX and CNAME
by aurfalien 25 Feb '13

25 Feb '13

On Feb 25, 2013, at 8:11 AM, Reindl Harald wrote: > > > Am 25.02.2013 17:06, schrieb aurfalien: >> Hi, >> >> Has any one had problems with mail clients were your DNS is like this; >> >> doman.com MX 50 mail.domain.com >> domain.com MX 100 mail2.domain.com >> >> domain.com CNAME www.domain.com > > you CAN NOT do that > > domain.com must be a A-record > is so, nothing can change this and named will refuse to start if you do so Sorry, should have clarified that an A record does exist for www.domain.com. - aurf

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Re: [CentOS] running yum update on remote servers
by Robert Moskowitz 25 Feb '13

25 Feb '13

On 02/25/2013 09:03 AM, Reindl Harald wrote: > > Am 25.02.2013 14:48, schrieb Robert Moskowitz: >> I have read a couple old threads here on updates for servers, and I am >> looking for some mechanics to getting the actual updates done. I don't >> want automatic updates; I want to control when and what gets updated. >> >> First I have to determine that a particular server needs updates. I >> suppose a daily script that would run "yum check-updates' and emails me >> the results could work, but then I would only want the email IF there >> was something to update, at my limited use of this option does not show >> anything to trigger a notify on changes. Does anyone know of a script >> that would do this? > /etc/cron.daily: > #!/bin/bash > ANG=C; yum -q check-update I am searching all sorts of combinations to figure out what 'ANG' does. I keep getting results like "Emmanuel C. Yumang M.D" :) So please enlighten me. Checking the exit value seems to be important. I did find http://wiki.centos.org/YumCheckOrInstallUpdates which I am studying. And it does not use ANG...

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Re: [CentOS] Help Requested: KVM VM configuration on Centos 6.3
by Sanjay Arora 25 Feb '13

25 Feb '13

On Mon, Feb 25, 2013 at 5:00 PM, Reindl Harald <h.reindl(a)thelounge.net> wrote: > Am 25.02.2013 12:27, schrieb Sanjay Arora: >> I need my VMs to be reachable from the internet by ssh & vnc > > VNC via internet? > man ssh-forwarding! > Yes, Thanks. But my problem at this stage is getting the bridging working right and testing it from LAN where I do not have any firewall between the VM host & client. Security issues will come later. Right now I'm failing to access the VMs at all ;-( so I am doing a fresh setup with the howto!

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Procmail/Formail problem on 6.3
by Fred Smith 25 Feb '13

25 Feb '13

Hi! In the process of making mysystem work again, having just done a reinstall of 6.3 x86_64. I have a considerable collection of procmail recipes for filtering mail in various ways, and since the upgrade none of 'em is working. procmail passes every mail thru spambayes, which gives back a rating on spamminess. this happens, so it's not as if procmail is simply punting. that is followed by tests for which mailbox it should go into, depending on the mailing list, or otherwise who it's from. these ARE NOT working. these recipes all use formail to append a header identifying the mail folder Procmail decided to use, and then the mail is appended to the mailbox. This has been working without problem for YEARS. but now, it all ends up in my main mailbox, where only those things that fail all the filters are supposed to go. aparently all the filters are failing. each filter is akin to this one: :0: * ^X-BeenThere: centos(a)centos.org | $FORMAIL -A"X-procmail: Centos-users" >>$HOME/Mail/centos which checks to see if it came from the centos mailing list, and if so should append a X"-Procmail: Centos-users" header then append the mail to $HOME/Mail/centos. Only it doesn't append the header, and it doesn't drop the mail in the centos mailbox. anyone out there got a clue? thanks! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The eyes of the Lord are everywhere, keeping watch on the wicked and the good. ----------------------------- Proverbs 15:3 (niv) -----------------------------

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Help Requested: KVM VM configuration on Centos 6.3
by Sanjay Arora 25 Feb '13

25 Feb '13

Hello I am trying to install KVM based VMs on my machine. First Timer...little idea on actually configuring related networking related issues. Am planning to follow this howto: http://www.howtoforge.com/virtualization-with-kvm-on-a-centos-6.3-server My trial machine is a server cum desktop with two network ports..eth0 is normally used for LAN & Internet access...eth1 is reserved for use with LTSP which is to be configured later. I need my VMs to be reachable from the internet by ssh & vnc etc. required ports will be forwarded from the Internet router. I propose to use subnet 10.0.1.0/24 for my virtual machines. Can someone please advise the content of bridge configuration file at /etc/sysconfig/network-scripts/ifcfg-br0, as given in the howto? The two bridges ltspbr0 & virbr0 shown below, are created by packages installed & not by me, so if any modifications are required in them...I need to know. Also, please advise if it is possible to get the VMs to use a 3G usb device for Internet access through the host machine Network Manage, in case Internet access through eth0 is down? Though this is not a priority at this stage, as I am just learning to use my first VM, but I'd like this feature if it is not too difficult. With regards. Sanjay. ifconfig output: [root@Swayam ~]# ifconfig eth0 Link encap:Ethernet HWaddr E0:69:95:77:A7:F3 inet addr:10.0.0.101 Bcast:10.0.0.255 Mask:255.255.255.0 inet6 addr: fe80::e269:95ff:fe77:a7f3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5120 errors:0 dropped:0 overruns:0 frame:0 TX packets:5506 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4205139 (4.0 MiB) TX bytes:684760 (668.7 KiB) Interrupt:20 Memory:fe600000-fe620000 eth1 Link encap:Ethernet HWaddr 00:60:52:0C:0B:DE UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:155 errors:0 dropped:0 overruns:0 frame:0 TX packets:155 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:59335 (57.9 KiB) TX bytes:59335 (57.9 KiB) ltspbr0 Link encap:Ethernet HWaddr AE:41:A9:3D:FE:A3 inet addr:172.31.100.254 Bcast:172.31.100.255 Mask:255.255.255.0 inet6 addr: fe80::ac41:a9ff:fe3d:fea3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:73 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:14407 (14.0 KiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:86:BD:15 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:45 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:11636 (11.3 KiB)

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Discuss February 2013