Discuss November 2010

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221 discussions

hwclock problem
by Jobst Schmalenbach 15 Nov '10

15 Nov '10

Hi. I run peridocally (from cron) on all of my machines 30 * * * * root /sbin/hwclock --systohc All of those machines in question take their time via NTP from the same local server, and that server gets its time from a ntp pool. Now I had to reboot a couple of them two days ago and to my surprise all had problems with the time upon booting. Here are the important files: [root@XXXXXX ~] #>l /etc/adjtime 0.001687 1289518202 0.000000 1289518202 LOCAL [root@XXXXXXX ~] #>l /etc/sysconfig/clock ZONE="Australia/Melbourne" UTC=false ARC=false So from my understanding the hwclock should contain the local time. [root@XXXXXX ~] #>date Fri Nov 12 11:26:23 EST 2010 [root@XXXXXX ~] #>hwclock Fri 12 Nov 2010 11:26:42 EST -0.167976 seconds [root@XXXXXX ~] #> However on boot I get the following: Nov 10 19:08:37 XXXXXX syslogd 1.4.1: restart. Nov 10 19:08:37 XXXXXX kernel: klogd 1.4.1, log source = /proc/kmsg started. Nov 10 19:08:37 XXXXXX kernel: Linux version 2.6.18-164.11.1.el5 (mockbuild(a)builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4. 1.2-46)) #1 SMP Wed Jan 20 07:32:21 EST 2010 Nov 10 19:08:37 XXXXXX kernel: Command line: ro root=/dev/sda2 vga=791 Nov 10 19:08:37 XXXXXX kernel: BIOS-provided physical RAM map: ... ... Nov 10 19:08:51 XXXXXX kernel: IPv6 over IPv4 tunneling driver Nov 10 08:08:52 XXXXXX ntpdate[2464]: step time server 192.168.1.1 offset -39599.950905 sec Nov 10 08:08:52 XXXXXX xinetd[2447]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. and off course dovecot falls over too "Time just moved backwards by 39599 seconds." Now, 39600s is 11 hours, which is (inc DST) *MY* offset from Greenwich. So what am I doing wrong? The idea of running hwclock is to make sure that exactly the problem with dovecot does NOT occur, and ntp does not have a coughing fit when the hardware clock is not close to the correct time upon booting. The last time I booted some of those machine was more than 200 days ago, so the hwclock will be skewed if I do not update it. Jobst -- Keyboard not found - please clean up desktop! | |0| | Jobst Schmalenbach, jobst(a)barrett.com.au, General Manager | | |0| Barrett Consulting Group P/L & The Meditation Room P/L |0|0|0| +61 3 9532 7677, POBox 277, Caulfield South, 3162, Australia

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Auto-Re: CentOS Digest, Vol 70, Issue 14
by 韦加宁 15 Nov '10

15 Nov '10

信已收到,谢谢!

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Re: [CentOS] SSH keys question [RESOLVED]
by John Kennedy 15 Nov '10

15 Nov '10

On Mon, Nov 15, 2010 at 13:45, Paul Heinlein <heinlein(a)madboa.com> wrote: > On Mon, 15 Nov 2010, cliff here wrote: > > > You should check the perms on the dirs, ssh will not allow it use > > the keys if they are too permissive. So I would check starting at > > /home > > This is the most likely cause; I'd check there too. > > If not, > > 1. Ensure the file hash is the same (e.g., no extraneous whitespace > in the middle of the key) > 2. sshd is usually pretty good about writing errors to syslog. > > -- > Paul Heinlein <> heinlein(a)madboa.com <> http://www.madboa.com/ > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > Found it... In /var/log/secure I got "Authentication refused: bad ownership or modes for directory /home/zema/.ssh" I had checked the file, not the directory... Thanks all... John -- John Kennedy

1 0

SSH keys question
by John Kennedy 15 Nov '10

15 Nov '10

All, I have 3 servers. All 3 are CentOS 5.5. All 3 have identical /etc/ssh/sshd_config files. I used ssh-keygen (with no arguments) to generate keys with no password. I then added all 3 id_rsa.pub keys to the authorized_keys file. With this set up, I should be able to ssh between all 3 boxes without needing a password. The problem is that one of the servers keeps asking for a password even with the keys set up. servera --> serverb No password serverb --> servera No password servera --> serverc Password serverc --> servera No password serverb --> serverc Password serverc --> serverb No password If they are all identical from an ssh standpoint (at least the authorized_keys, /etc/sshd_config, and UID for the user on all 3 hosts), why will serverc not play nicely with the other 2> Is there something else I should be checking? Thanks, John -- John Kennedy

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can't find ldapseaerch
by bluethundr 15 Nov '10

15 Nov '10

hello list I'm having a very strange problem with my centos 5.5 system. For some strange reason, this machine cannot find ldapsearch: [root@VIRTCENT13 ~]# ldapsearch ldapsearch: Command not found. [root@VIRTCENT13 ~]# whereis ldapsearch ldapsearch: /usr/bin/ldapsearch /usr/share/man/man1/ldapsearch.1.gz ldapsearch currently lives at /usr/bin along with a lot of other really very useful tools. /usr/bin is also _clearly_ on my root path:i [root@VIRTCENT13 ~]# echo $PATH /usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin And here are the permissions and modes for this tool: [root@VIRTCENT13 bin]# ls -l ldapsearch -rwxr-xr-x 1 root wheel 65336 Aug 11 09:20 ldapsearch And other things in this directory (like yum for example) work just fine: [root@VIRTCENT13 bin]# yum repolist Loaded plugins: fastestmirror, priorities Existing lock /var/run/yum.pid: another copy is running as pid 11750. Another app is currently holding the yum lock; waiting for it to exit... The other application is: yum-updatesd-he Memory : 65 M RSS (107 MB VSZ) Started: Sat Nov 13 18:04:22 2010 - 00:57 ago State : Running, pid: 11750 If you feed the command line the full path to ldapsearch it works as intended. I was wondering if anyone had any idea why ldapsearch isn't being found? thanks! -- Here's my RSA Public key: gpg --keyserver pgp.mit.edu --recv-keys 5A4873A9 Share and enjoy!!

4 3

ipvs and destination hashing...
by John Doe 15 Nov '10

15 Nov '10

Hi, just in case some ipvs knowledgable people read this... I tried to find some info on ipvs destination hashing on the net but did not find anything... Right now we have a basic direct routing round-robin keepalived configuration: abc.example.com (a.b.c.d) => LVS ( round-robin ) => server_[1..n] with IP[1..n]. If we use the dh option, on what would the hashing be done? I saw some pseudo code that states that the hash is based on the destination IPs in the packets... But there is only 1 IP in input and the output IPs are selected by round-robin already (so no point dhing them)... Do we have to have n IPs for abc.example.com (in the dns) and the hashing will be done on these IPs? Thx, JD

1 0

Auto-Re: CentOS Digest, Vol 70, Issue 15
by 韦加宁 15 Nov '10

15 Nov '10

信已收到,谢谢!

1 0

RPM/YUM on CentOS 5.4 issue - multiple versions of the same package installed
by Gabriel Tabares 15 Nov '10

15 Nov '10

Hi all, We currently have an issue with multiple versions of a custom package being installed. The RPM contains a liquibase script (a Java-based DB change management tool) and a %post script to run liquibase. We are installing with scripts that run "yum update liquibase-script". If the %post script runs correctly, it returns 0 and the application gets installed correctly but, if the %post script fails, it returns -1 and the application does get installed, but the old one does not get unistalled, so if I run "rpm -qa | grep liquibase-script" I get a list of all the versions that have been installed. I know that the files have been installed correctly, as the RPM contents have the same name but different content and I have checked it. Why is this happening? I thought that %post scripts failing do not prevent the application to installing and that RPM installation is atomic, so installing one package will remove the previous verison. Is there any way to prevent this issue? We're using CentOS 5.4 on x86_64 Thanks Gabriel

2 2

updating to gtk+ >= 2.0
by aurfalien＠gmail.com 15 Nov '10

15 Nov '10

Hi all, Any know the best way to up gtk+ on Centos 5.5 to something being at least 2.0 or greater? - aurf

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xServes are dead ;-( / SAN Question
by Nicolas Ross 15 Nov '10

15 Nov '10

Hi ! As some of you might know, Apple has discontinued it's xServes server as of january 31st 2011. We have a server rack with 12 xserves ranging from dual G5's to dual quand-core xeon lastest generation, 3 xserve-raid and one activeraid 16 TB disk enclosure. We also use xSan to access a shared file system among the servers. Services are run from this shared filesystem, spreaded across the servers. Some LUNs on the fiber channel network are accessed directly and mounted on a case-by-case basis. Those raid volumes are partitioned with a GUID partition map, and apple_label type volumes. So they can be mounted by name with mount_hfs. We were on the verge on upgrading at least 6 of our server in a separate location (as a backup-site), with another SAN, same aplication etc. But this announce has come put a little delay. We do have several servers running CentOS (about 10 or so), on intel server platform. Now with this said, I am searching for documentation on operating a SAN under linux. We are looking at Quantum StorNext FS2 product for the SAN itselft. And I am searching info about accessing volumes on a fiber channel network by label. I know I can label individual ext3 partition, but how to do so on a raid array via fiber channel ? Basicly, I search for a linux starter guide to fiber channel storage. Thanks for any insight. Nicolas

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Discuss November 2010