From chandrakantreddy at gmail.com Mon May 9 15:12:09 2011 From: chandrakantreddy at gmail.com (chandrakantreddy at gmail.com) Date: Mon, 9 May 2011 20:42:09 +0530 (IST) Subject: chandrakantreddy@gmail.com is inviting you to freecharge.in Message-ID: <20110509151217.48FB722710AD@freecharge.in> An HTML attachment was scrubbed... URL: From dmitry at athabascau.ca Thu May 12 21:03:15 2011 From: dmitry at athabascau.ca (Dmitry Makovey) Date: Thu, 12 May 2011 15:03:15 -0600 Subject: slow "KVM Host" in EL6 ? Message-ID: <201105121503.19177.dmitry@athabascau.ca> Hi everybody, we have some weird problem with EL6 box which serves as a KVM host for 3 VMs currently. It shares the same interface with all 3 VMs (same network). All works, except from time to time machine behaves very slow in console (ok, SSH connection) and it happens only from time to time. We've got vnstat running on that box. There is no sign of network overload so far. Average load never crosses 1 (actually it's in 0.2 neighbourhood) so we're really at loss. Did anybody experience something similar? Any suggestions on where to look? -- Dmitry Makovey Web Systems Administrator Athabasca University (780) 675-6245 --- When in trouble when in doubt run in circles scream and shout http://www.wordwizard.com/phpbb3/viewtopic.php?f=16&t=19330 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 190 bytes Desc: This is a digitally signed message part. URL: From bda20 at cam.ac.uk Thu May 12 21:30:02 2011 From: bda20 at cam.ac.uk (Ben) Date: Thu, 12 May 2011 22:30:02 +0100 (BST) Subject: slow "KVM Host" in EL6 ? In-Reply-To: <201105121503.19177.dmitry@athabascau.ca> References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: On Thu, 12 May 2011, Dmitry Makovey wrote: > we have some weird problem with EL6 box which serves as a KVM host for 3 > VMs currently. It shares the same interface with all 3 VMs (same network). > All works, except from time to time machine behaves very slow in console > (ok, SSH connection) and it happens only from time to time. > [...] It may be unconnected but I have a RHEL6 box which also occasionally has an issue with slow SSH connection. By that I mean you type "ssh rhel6host", the password prompt comes up quickly, but after entering the password and hitting return there's a palpable delay (sometimes) before the prompt appears. Not every time, but often. Sometimes as long as four to five seconds. A RHEL6 KVM guest I installed on it also has the same issue (sometimes). I've run ssh with -vvv and sshd with -vvv and not seen anything untoward. DNS is on the local LAN and reports no issues either. All connections are from RHEL5 hosts. Just somtimes connection is... slow. Ben -- Unix Support, MISD, University of Cambridge, England Plugger of wire, typer of keyboard, imparter of Clue Life Is Short. It's All Good. From paul.nuffer at gmail.com Fri May 13 12:44:23 2011 From: paul.nuffer at gmail.com (Paul N) Date: Fri, 13 May 2011 06:44:23 -0600 Subject: slow "KVM Host" in EL6 ? In-Reply-To: References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: On Thu, May 12, 2011 at 3:30 PM, Ben wrote: > On Thu, 12 May 2011, Dmitry Makovey wrote: > >> we have some weird problem with EL6 box which serves as a KVM host for 3 >> VMs currently. It shares the same interface with all 3 VMs (same network). >> All works, except from time to time machine behaves very slow in console >> (ok, SSH connection) and it happens only from time to time. >> [...] > > It may be unconnected but I have a RHEL6 box which also occasionally has an > issue with slow SSH connection. ?By that I mean you type "ssh rhel6host", > the password prompt comes up quickly, but after entering the password and > hitting return there's a palpable delay (sometimes) before the prompt > appears. ?Not every time, but often. ?Sometimes as long as four to five > seconds. ?A RHEL6 KVM guest I installed on it also has the same issue > (sometimes). ?I've run ssh with -vvv and sshd with -vvv and not seen > anything untoward. ?DNS is on the local LAN and reports no issues either. > All connections are from RHEL5 hosts. ?Just somtimes connection is... slow. > Hi, I've seen the problem you've described when I have a bogus entry for localhost (or an incorrect IP address for the server's FQDN) in /etc/hosts. YYMV of course! Paul From cmadams at hiwaay.net Fri May 13 13:00:27 2011 From: cmadams at hiwaay.net (Chris Adams) Date: Fri, 13 May 2011 08:00:27 -0500 Subject: slow "KVM Host" in EL6 ? In-Reply-To: References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: <20110513130027.GB2741@hiwaay.net> Once upon a time, Ben said: > It may be unconnected but I have a RHEL6 box which also occasionally has an > issue with slow SSH connection. By that I mean you type "ssh rhel6host", > the password prompt comes up quickly, but after entering the password and > hitting return there's a palpable delay (sometimes) before the prompt > appears. Not every time, but often. Sometimes as long as four to five > seconds. Are you using network authentication and sssd? It is slow; you can get a half-second or more delay on initgroups(). -- Chris Adams Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble. From bda20 at cam.ac.uk Fri May 13 13:05:58 2011 From: bda20 at cam.ac.uk (Ben) Date: Fri, 13 May 2011 14:05:58 +0100 (BST) Subject: slow "KVM Host" in EL6 ? In-Reply-To: <20110513130027.GB2741@hiwaay.net> References: <201105121503.19177.dmitry@athabascau.ca> <20110513130027.GB2741@hiwaay.net> Message-ID: On Fri, 13 May 2011, Chris Adams wrote: > Once upon a time, Ben said: >> It may be unconnected but I have a RHEL6 box which also occasionally has >> an issue with slow SSH connection. By that I mean you type "ssh >> rhel6host", the password prompt comes up quickly, but after entering the >> password and hitting return there's a palpable delay (sometimes) before >> the prompt appears. Not every time, but often. Sometimes as long as >> four to five seconds. > > Are you using network authentication and sssd? It is slow; you can get a > half-second or more delay on initgroups(). Nope, just plain old local authentication. 100% vanilla RHEL6 install on that front. Ben -- Unix Support, MISD, University of Cambridge, England Plugger of wire, typer of keyboard, imparter of Clue Life Is Short. It's All Good. From bda20 at cam.ac.uk Fri May 13 13:07:45 2011 From: bda20 at cam.ac.uk (Ben) Date: Fri, 13 May 2011 14:07:45 +0100 (BST) Subject: slow "KVM Host" in EL6 ? In-Reply-To: References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: On Fri, 13 May 2011, Paul N wrote: > On Thu, May 12, 2011 at 3:30 PM, Ben wrote: >> On Thu, 12 May 2011, Dmitry Makovey wrote: >> >>> we have some weird problem with EL6 box which serves as a KVM host for 3 >>> VMs currently. It shares the same interface with all 3 VMs (same network). >>> All works, except from time to time machine behaves very slow in console >>> (ok, SSH connection) and it happens only from time to time. >>> [...] >> >> It may be unconnected but I have a RHEL6 box which also occasionally has >> an issue with slow SSH connection. ?By that I mean you type "ssh >> rhel6host", the password prompt comes up quickly, but after entering the >> password and hitting return there's a palpable delay (sometimes) before >> the prompt appears. ?Not every time, but often. ?Sometimes as long as >> four to five seconds. ?A RHEL6 KVM guest I installed on it also has the >> same issue (sometimes). ?I've run ssh with -vvv and sshd with -vvv and >> not seen anything untoward. ?DNS is on the local LAN and reports no >> issues either. All connections are from RHEL5 hosts. ?Just somtimes >> connection is... slow. > > I've seen the problem you've described when I have a bogus entry for > localhost (or an incorrect IP address for the server's FQDN) in > /etc/hosts. YYMV of course! /etc/hosts: 10.1.1.158 knife.internal.admin.cam.ac.uk knife # Added by NetworkManager 127.0.0.1 localhost.localdomain localhost ::1 knife.internal.admin.cam.ac.uk knife localhost6.localdomain6 localhost6 Ben -- Unix Support, MISD, University of Cambridge, England Plugger of wire, typer of keyboard, imparter of Clue Life Is Short. It's All Good. From paul.nuffer at gmail.com Fri May 13 13:17:28 2011 From: paul.nuffer at gmail.com (Paul N) Date: Fri, 13 May 2011 07:17:28 -0600 Subject: slow "KVM Host" in EL6 ? In-Reply-To: References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: On Fri, May 13, 2011 at 7:07 AM, Ben wrote: > On Fri, 13 May 2011, Paul N wrote: > >> On Thu, May 12, 2011 at 3:30 PM, Ben wrote: >>> >>> On Thu, 12 May 2011, Dmitry Makovey wrote: >>> >> I've seen the problem you've described when I have a bogus entry for >> localhost (or an incorrect IP address for the server's FQDN) in /etc/hosts. >> YYMV of course! > > /etc/hosts: > > 10.1.1.158 ? ? ?knife.internal.admin.cam.ac.uk ?knife ? # Added by > NetworkManager > 127.0.0.1 ? ? ? localhost.localdomain ? localhost > ::1 ? ? knife.internal.admin.cam.ac.uk ?knife ? localhost6.localdomain6 > localhost6 > Yeah, if that 10.1.1.158 IP address is correct for your host, you don't have the problem I did :) From dmitry at athabascau.ca Tue May 17 14:30:00 2011 From: dmitry at athabascau.ca (Dmitry Makovey) Date: Tue, 17 May 2011 08:30:00 -0600 Subject: slow "KVM Host" in EL6 ? In-Reply-To: <201105121503.19177.dmitry@athabascau.ca> References: <201105121503.19177.dmitry@athabascau.ca> Message-ID: <201105170830.04036.dmitry@athabascau.ca> On Thursday, May 12, 2011, Dmitry Makovey wrote: > Hi everybody, > > we have some weird problem with EL6 box which serves as a KVM host for 3 > VMs currently. It shares the same interface with all 3 VMs (same network). > All works, except from time to time machine behaves very slow in console > (ok, SSH connection) and it happens only from time to time. > > We've got vnstat running on that box. There is no sign of network overload > so far. Average load never crosses 1 (actually it's in 0.2 neighbourhood) > so we're really at loss. > > Did anybody experience something similar? Any suggestions on where to look? looking at responses is it safe to assume - nobody ever seen problems described above (which would mean we have to dig into our configuration to be able to spot the problem) -- Dmitry Makovey Web Systems Administrator Athabasca University (780) 675-6245 --- When in trouble when in doubt run in circles scream and shout http://www.wordwizard.com/phpbb3/viewtopic.php?f=16&t=19330 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 190 bytes Desc: This is a digitally signed message part. URL: From greg at unixos.org Tue May 17 18:16:12 2011 From: greg at unixos.org (Greg Wojcieszczuk) Date: Tue, 17 May 2011 19:16:12 +0100 Subject: slow "KVM Host" in EL6 ? In-Reply-To: <201105170830.04036.dmitry@athabascau.ca> References: <201105121503.19177.dmitry@athabascau.ca> <201105170830.04036.dmitry@athabascau.ca> Message-ID: <4DD2BB6C.9010107@unixos.org> Hi, I'm experiencing similar problem on RHEL6. It's seems to be due to excessive context switches. The same VMs running on RHEL5 (KVM) didn't exhibit this problem. I found this issue described in the following bugzilla case: https://bugzilla.redhat.com/show_bug.cgi?id=645898 When your VMs are running, check: vmstat 1 This supposed to be fixed in RHEL6.1 kernels. Regards, Greg Wojcieszczuk On 05/17/2011 03:30 PM, Dmitry Makovey wrote: > On Thursday, May 12, 2011, Dmitry Makovey wrote: >> Hi everybody, >> >> we have some weird problem with EL6 box which serves as a KVM host for 3 >> VMs currently. It shares the same interface with all 3 VMs (same network). >> All works, except from time to time machine behaves very slow in console >> (ok, SSH connection) and it happens only from time to time. >> >> We've got vnstat running on that box. There is no sign of network overload >> so far. Average load never crosses 1 (actually it's in 0.2 neighbourhood) >> so we're really at loss. >> >> Did anybody experience something similar? Any suggestions on where to look? > looking at responses is it safe to assume - nobody ever seen problems > described above (which would mean we have to dig into our configuration to be > able to spot the problem) > > > > -- > redhat-sysadmin-list mailing list > redhat-sysadmin-list at redhat.com > https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list -------------- next part -------------- An HTML attachment was scrubbed... URL: From jpoling at moody.edu Tue May 24 18:51:34 2011 From: jpoling at moody.edu (Jeff Poling) Date: Tue, 24 May 2011 13:51:34 -0500 Subject: Password policy Message-ID: <9599A350A0A5884DB4E50D83F9287D0F01ECEEC609@exchmbx01.moody.edu> On a standard build of RHEL 4/5 (not SELinux), is there a way to specify password policy for local accounts such as root? Thanks, Jeff Jeffrey Poling System Administrator | Information Systems Moody Bible Institute 820 N. LaSalle Blvd., Chicago, IL 60610 312-329-8968 www.moodyministries.net >From the Word. To Life. -------------- next part -------------- An HTML attachment was scrubbed... URL: From ben.kevan at gmail.com Tue May 24 20:49:32 2011 From: ben.kevan at gmail.com (Ben Kevan) Date: Tue, 24 May 2011 13:49:32 -0700 Subject: Password policy In-Reply-To: <9599A350A0A5884DB4E50D83F9287D0F01ECEEC609@exchmbx01.moody.edu> References: <9599A350A0A5884DB4E50D83F9287D0F01ECEEC609@exchmbx01.moody.edu> Message-ID: On Tue, May 24, 2011 at 11:51 AM, Jeff Poling wrote: > On a standard build of RHEL 4/5 (not SELinux), is there a way to specify > password policy for local accounts such as root? > > > > Thanks, > > > > Jeff > > > > *Jeffrey Poling* > > *System Administrator | Information Systems* > > Moody Bible Institute > > 820 N. LaSalle Blvd., Chicago, IL 60610 > > 312-329-8968 > > www.moodyministries.net > > From the Word. To Life. > > > -- > redhat-sysadmin-list mailing list > redhat-sysadmin-list at redhat.com > https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list > For non-root use cracklib. Root is able to override any of these policies, which is by design. People that have root account should be able to comply with password policies. -------------- next part -------------- An HTML attachment was scrubbed... URL: From root at nachtmaus.us Tue May 24 21:10:48 2011 From: root at nachtmaus.us (root at nachtmaus.us) Date: Tue, 24 May 2011 21:10:48 +0000 Subject: Password policy In-Reply-To: <9599A350A0A5884DB4E50D83F9287D0F01ECEEC609@exchmbx01.moody.edu> References: <9599A350A0A5884DB4E50D83F9287D0F01ECEEC609@exchmbx01.moody.edu> Message-ID: <1456061423-1306271445-cardhu_decombobulator_blackberry.rim.net-913540982-@b25.c5.bise6.blackberry> PAM can control this and enforce these policies. Sent via BlackBerry from T-Mobile -----Original Message----- From: Jeff Poling Sender: redhat-sysadmin-list-bounces at redhat.com Date: Tue, 24 May 2011 13:51:34 To: redhat-sysadmin-list at redhat.com Reply-To: redhat-sysadmin-list at redhat.com Subject: Password policy -- redhat-sysadmin-list mailing list redhat-sysadmin-list at redhat.com https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list From alfredo.deluca at gmail.com Fri May 27 01:20:36 2011 From: alfredo.deluca at gmail.com (Alfredo De Luca) Date: Fri, 27 May 2011 11:20:36 +1000 Subject: Server Hang Message-ID: Hi all. We have Red Hat Enterprise Linux Server release 5.5 running on Sun Blade x6270 and occasionally the server hang with just error message in the logs: May 23 14:37:41 xxxxxxxxxxxx kernel: SysRq : Resetting May 23 14:43:06 xxxxxxxxxxxx syslogd 1.4.1: restart. Any clue? Bios issues or bugs? Cheers -- *Alfredo* -------------- next part -------------- An HTML attachment was scrubbed... URL: From jsbillin at umich.edu Fri May 27 20:08:12 2011 From: jsbillin at umich.edu (Jonathan Billings) Date: Fri, 27 May 2011 16:08:12 -0400 Subject: Server Hang In-Reply-To: References: Message-ID: <20110527200811.GA8041@meson.local> On Fri, May 27, 2011 at 11:20:36AM +1000, Alfredo De Luca wrote: > Hi all. > > We have Red Hat Enterprise Linux Server release 5.5 running on Sun Blade > x6270 and occasionally the server hang with just error message in the logs: > > May 23 14:37:41 xxxxxxxxxxxx kernel: SysRq : Resetting Looks like someone hit the Magic Sysrq key for doing a reset: http://en.wikipedia.org/wiki/Magic_SysRq_key#Magic_commands (look at 'b' in the qwerty column) This is something done either from a keyboard, from a serial console (if that's set up) or someone running 'echo b > /proc/sysrq-trigger'. I think some load-balancing software uses the /proc/sysrq-trigger method to kill wedged server, so it might be an indicator something else is resetting the system. -- Jonathan Billings College of Engineering - CAEN - Unix and Linux Support From alfredo.deluca at gmail.com Sun May 29 11:00:44 2011 From: alfredo.deluca at gmail.com (Alfredo De Luca) Date: Sun, 29 May 2011 21:00:44 +1000 Subject: Server Hang In-Reply-To: <20110527200811.GA8041@meson.local> References: <20110527200811.GA8041@meson.local> Message-ID: Hi Jonathan. I think you're right. The only thing I can think of is the Oracle RAC Cluster that might send this resetting for save the integrity of the DB....in a few words is a fencing. Thanks Alfredo On Sat, May 28, 2011 at 06:08, Jonathan Billings wrote: > On Fri, May 27, 2011 at 11:20:36AM +1000, Alfredo De Luca wrote: > > Hi all. > > > > We have Red Hat Enterprise Linux Server release 5.5 running on Sun Blade > > x6270 and occasionally the server hang with just error message in the > logs: > > > > May 23 14:37:41 xxxxxxxxxxxx kernel: SysRq : Resetting > > Looks like someone hit the Magic Sysrq key for doing a reset: > http://en.wikipedia.org/wiki/Magic_SysRq_key#Magic_commands > (look at 'b' in the qwerty column) > > This is something done either from a keyboard, from a serial console > (if that's set up) or someone running 'echo b > /proc/sysrq-trigger'. > > I think some load-balancing software uses the /proc/sysrq-trigger > method to kill wedged server, so it might be an indicator something > else is resetting the system. > > > -- > Jonathan Billings > College of Engineering - CAEN - Unix and Linux Support > > -- > redhat-sysadmin-list mailing list > redhat-sysadmin-list at redhat.com > https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list > -- *Alfredo* -------------- next part -------------- An HTML attachment was scrubbed... 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