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centos speech to text?
by hadi motamedi 03 Aug '11

03 Aug '11

Dear All On my centos 5.6 , the KMouth is functioning for 'text to speech' facility. Can you please let me know if we have 'speech to text' facility for centos? Thank you

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EL6: Hard Disk upgrade howto?
by Benjamin Smith 03 Aug '11

03 Aug '11

I have a tested copy of EL6 that I would like to duplicate to a number of similar servers, but can't seem to find a sane howto on the subject. TLDP's "Hard disk upgrade howto" is embarrassingly antiquated: when's the last time you saw LILO? What's the recommended procedure for doing an HDD copy/upgrade from one disk to another? Is there a nice, detailed howto that explains this in detail? My set up is pretty straight forward. My partitions are all set up as simple partitions, with UUID's in /etc/fstab. I'm not using LVM or RAID. Any ideas? -Ben -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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Re: [CentOS] Two ftp clients? Why?
by James B. Byrne 02 Aug '11

02 Aug '11

Mike A. Harris mharris at mharris.ca Tue Aug 2 16:45:56 EDT 2011 > What I'm left wondering is: > > 1) Why you are relying on PATH expansion for this from something as > critical as a cron job. It is good sysadmin practice to specify > explicit paths for situations like this rather than to worry about > whether or not there is a good or valid reason for there being 2 > ftp clients installed on the system. Point taken and that is e=indeed what i subsequently did. However, in my defence I explicitly set the PATH variable in the crontab entry prior to invoking the calling script that uses ftp. It never crossed my mind that I should have first done a 'which ftp' to discover which one was being used in my login shell because it never crossed my mind that there would be two different ftp clients on my systems to begin with. And frankly, I do not think that anyone would a priori conceive of there being two separate telnet clients, two different sftp clients, or two of anything else of a similar nature as being a reasonable possibility. > 2) Why you are using an ftp client rather than something like > wget or curl instead, both of which are far more powerful and > script friendly. I tried to use cURL for this particular bit, I in fact use cURL everywhere else in the same script. However, I am unable to determine how to get cURL to give me a meaningful response to the SYST command whereas the ftp client gives me a quite fulsome answer. > Presumably the kerberos client only gets installed if kerberos > infrastructure is installed, and the standard ftp client is > probably part of the default install as people expect it to be > there perhaps. Putting in unnecessary logic to only install one > ftp client and not the other doesn't make much sense either. Leaving it for an unsuspecting user to discover that there are two dissimilar versions of the same utility is not user friendly. > Focusing on finding the best way develop solid solutions to > administrative scripting problems like this is IMHO much more > important than trying to know or guess what the rationale is > behind there being 2 ftp binaries on the system. A rationale is more than I expect. The excuse is likely that it is just too difficult to bother with, as you pointed out above. > Anyhow, if you have expectations of specific software being > installed or not installed on your systems the only reliable > and reproducible way to do that is to use kickstart with a > minimal install and build up the package list to include only > the things you want to have installed. I expected an ftp client to be installed and I found one in the place I expected it to be. What I did not expect was that there was a second one installed somewhere else on a basic CentOS system with few local customizations and that it was the other client that I was using in my login shell. I am sure that paranoia is a valued admin quality but truly I do not expect to have to run which on every stock utility present on a reputable distribution just to discover if there is a second version of something installed somewhere obscure and stuck into my path by the packager. Nor do I expect that this issue or any like it will ever be considered important enough to comment on by upstream, much less looked at and reconciled. Which essentially is why I dropped RH support and went to CentOS in the first place. But I am pissed that this sort of BS still gets me from time to time. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Sudo #includedir function ignored CentOS 6
by Trey Dockendorf 02 Aug '11

02 Aug '11

I am unable to get the #includedir function to work with sudo. This works just fine on all my CentOS 5.6 servers, but on 6 it is being ignored. I have this line in the file /etc/sudoers.d/zabbix-puppet zabbix ALL=NOPASSWD: /var/lib/zabbix/bin/start_puppet However sudo still requires a password. If I put that same line into /etc/sudoers file , there is no password prompt. At the end of my sudoers file I have this line #includedir "/etc/sudoers.d" It seems that line is being ignored. The permissions on the file in that directory are 0440. Any ideas would be greatly appreciated. Thanks - Trey

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Good for a chuckle
by R P Herrold 02 Aug '11

02 Aug '11

I see in my overnight email spool: https://bugzilla.redhat.com/show_bug.cgi?id=726872 I am amused because this kind of request comes up time and time again with respect the package management system It is technically _possible_ to attain this kind of rollbacks, in some tightly controlled environments [something like cell phone tower control computer applications, where there are essentially NO end users in the environment and the computer is acting like an embedded controller], but in the general case with many diverse and randomly maintained packages, each with their own assumptions as to how to maintain their run-time environments, it is 'not gonna happen'' (TM) After deployment, User A will use postgresql or perhaps mysql to build a LAMP system. Updates will happen, and either pgsql or mysql will need to rebuild indices on the database store, because there has been a non-compatible bugfix, that is not backward compatible, or something to that effect. Because the database software authors have been burned, they have written documentation cautioning to take and test database backup dumps that may be reloaded, and and indeed also conversion testing scripts that actually attempt to do it 'behind the scenes'. The scripts are robust and will carp and bail if they run out of space, or otherwise fail other sanity checks. But there is a design decision: is one 'polite' as to filesystem use and pollution, and NOT leave that intermediate dump behind; or is one paranoid and save and age several backups, both for this conversion and generally, because you (the database software author) have been berated by your use community for THEIR failure not to read the documentation and to heed the warning to take and test backups [Those reading this will note certain parallels to rants by low-formality 'admins' who appear here from time to time -- just a random co-incidence, I am sure] Then RPM has the reasonable design feature, quite intentionally, of providing access to the full, Turing complete which a shell prompt offers. Anconda does as well. THAT can provide for dynamic repartitioning, filesystem type conversions, and so on ... How does one 'roll back' from such one-way operations? The answer of course, is one cannot without 'out of the installation' backups So I am amused that a person sees the RPM hammer, and thinks every problem looks like a nail, rather than, say, TESTING all variants, so there IS NO NEED for such a 'roll-back' capability; or running virtual instances so a 'prior backup' can be taken, the upgrade performed, and if problems show up -- no problem, just start the prior backup and the undesired 'upgrade' does not hurt at all -- Russ herrold

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Cannot remove freshly created logical volumes
by Dennis Jacobfeuerborn 02 Aug '11

02 Aug '11

Hi, I've got a strange situation where I cannot remove logical volumes even right after they have been created: [root@centos6 ~]# lvcreate -n c6minimal -L+5G vg_nexus Logical volume "c6minimal" created [root@centos6 ~]# lvremove /dev/vg_nexus/c6minimal Can't remove open logical volume "c6minimal" [root@centos6 ~]# vgck vg_nexus [root@centos6 ~]# dmsetup info -c vg_nexus-c6minimal Name Maj Min Stat Open Targ Event UUID vg_nexus-c6minimal 253 23 L--w 0 1 0 LVM-rIIS0StztO1tPspxCxiKWJgcmjiufxvXC343e8jObzXGRHbdtvHaHWfh17ZSukm3 I've even gone to runlevel 1 but still LVM claims that the device is open despite dmsetup saying that is not the case. vgck doesn't show anything suspicious either. Any ideas how I could debug this further? Regards, Dennis

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No debuginfo for Centos 6?
by Dennis Jacobfeuerborn 02 Aug '11

02 Aug '11

Hi, I'm trying to use oprofile to debug a problem with idle virtual machines eating 10% cpu but apparently the debuginfo packages for Centos 6 do not exist and so I cannot get any useful information from the kernel. Is there some way to at least get the kernel-debuginfo from somewhere? Regards, Dennis

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RedHat to CentOS packages
by Gabriel Tabares 02 Aug '11

02 Aug '11

Dear all, We're trying to use Nessus to monitor our system and we're having a hard time mapping the package versions from RedHat to CentOS in order to be able to report against CVE (vulnerability reports). After some research, we think that the mapping is as follows (using HTTPD as the example): CentOS httd-2.2.3-43.el5.centos.3 is equivalent to RedHat httpd-2.2.3-43.el5_5.3 So, it looks like CentOS replaces "_$MINOR_RELEASE" (in this case "_5") with ".centos" . Is this a fair assumption or are there other rules we are missing? Is this documented anywhere? Thanks Gabriel Tabares

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Iptables - flooding console
by cbulist＠gmail.com 01 Aug '11

01 Aug '11

Hi, We are trying to track some specific rules using LOG as target. Everything is working well but the problem is that iptables is flooding the console with LOG messages. We tried --log level 4 on iptables rules but it didn't work. We fixed the problem changing KLOGD_OPTIONS value in /etc/sysconfig/syslog to: KLOG_OPTIONS="-c 4" Is it the best option or we are missing something? Thanks in advance

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high performance open source DHCP solution?
by Rogelio 01 Aug '11

01 Aug '11

The free DHCP solution, ISC, seems to be having scaling issues (i.e. handling only about 200 DHCPDISCOVER and 20 DHCPRENEW requests), and I was wondering if anyone had any open source suggestions of solutions that could scale much better? (Ideally, I could find a free version of a solution like Nominum, but I know that's asking for much.) Anyone have any suggestions? -- Also on LinkedIn? Feel free to connect if you too are an open networker: scubacuda(a)gmail.com

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