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Semaphore setup on database???
by mcclnx mcc 16 Jun '08

16 Jun '08

we are tried setup CENTOS 4.6 with Informix Dynamic server version 10 UC8 on DELL 6800. The problem we have is while doing bdatabase backup (ontape), we have error happen. I guess the error come from "semaphoe". server semaphore are: # sysctl -a|grep sem kernel.sem = 250 32000 128 128 # sysctl -a|grep shm vm.hugetlb_shm_group = 0 kernel.shmmni = 4096 kernel.shmall = 4194304 kernel.shmmax = 2147483648 Does anyone has ideal what semaphore should setup in Informix? Thanks. 付費才容量無上限？Yahoo!奇摩電子信箱2.0免費給你，信件永遠不必刪！ - 馬上體驗！

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OT - host/asset tracking
by Mark Belanger 16 Jun '08

16 Jun '08

Can anyone recommend something for tracking assets particularly computer. I'm looking to capture: hostname OS/arch Hardware info(cpu, mem, etc) Function(i.e. what is the machine used for) -Mark

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RE: Re: [CentOS] extremely slow network connection
by Tony Wicks 16 Jun '08

16 Jun '08

The computer is on a local switch together with an older computer, which in turn communicates well at 25 MB/s with all the rest of the world. At Dell's they propose a hardware support, however not for that model. Nevertheless they support officially CentOS. That's why I asked whether anyone had encoutered the same problem already, and could perhaps provide a solution. Yours, Peter I would recommend looking at your network speed/duplex negotiation with your switch. I suspect your switch may be full duplex and your network card half or vice versa. Try forcing your network card to various speed/duplex settings (and your switch if it is a decent managed unit) and re-try your testing. This is the most common cause of network performance issues. cheers

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booting usb stick
by Jerry Geis 16 Jun '08

16 Jun '08

Hi all, I have been trying to get a usb stick 8G to boot centos. I am as far a it boots and hangs at "Switching to new root". I take the same USB stick and put it another PC and it boots fine. What might I look for as to why the machine hangs at switching to new root? Of course the machines are different. The one that does not boot is an ebox 2300sx and the one that does boot is an amd 4800+ with all disks unplugged except the USB stick. I am sooooo close. Jerry

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Re: Re: [CentOS] extremely slow network connection
by Peter Reinhardt 16 Jun '08

16 Jun '08

Dear Hendrik, Dag and Wealid, thank you for the replies; to be more specific, here is some more info: its a DELL Optiplex 755, with a 2 Gb/s onboard card. I did not write this because the same happens with an additional, elder 3Com card and Fedora 9, with a 2.6.25 kernel. Monitor and SATA disk work fine. The computer is on a local switch together with an older computer, which in turn communicates well at 25 MB/s with all the rest of the world. At Dell's they propose a hardware support, however not for that model. Nevertheless they support officially CentOS. That's why I asked whether anyone had encoutered the same problem already, and could perhaps provide a solution. Yours, Peter -- v v v v v v v v v v v v v v v v v v v v v > Peter Reinhardt | Maître de Conférences < > Lab. Chimie Théorique | (HDR) < > Université Paris VI | < > 4 place Jussieu, case 137 | Tél.: +33(0)1 44 27 9657 < > F -- 75252 Paris, France | Fax.: 4117 < > email: Peter.Reinhardt(a)upmc.fr < > Web: http://www.lct.jussieu.fr/pagesperso/reinh < ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

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CentOS Boot-Up front-end 'Show Details' Menu will not display the standard messages
by Balaji 16 Jun '08

16 Jun '08

Dear All, During CentOS Boot-Up user can See all of the standard messages within this front-end by clicking on the 'Show Details' link and hide the standard messages within this front-end by clicking on the 'Hide Details' link. Previously when i click the "Show Details" Menu it will display the system boot-up standard messages.I do not know what will happen and After some time when i click the "Show Details" Menu it will not display the system boot-up standard messages and it will display the following message alone "Enabling Swap Space OK" on clicking "Show Details" Menu I tried to google-out and i can't find out the show details and hide details configuration files I am not sure why this is happening. Can some one throw light on this. Regards -S.Balaji

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extremely slow network connection
by Peter Reinhardt 16 Jun '08

16 Jun '08

Dear all, on a brand new DELL computer CentOS 5.1 installs well, but the internet connection is extremely slow (8 kB/s, indeed kiloBytes !). Did anyone find a solution to that problem ? It might be more DELL specific than CentOS specific. Yours, Peter -- v v v v v v v v v v v v v v v v v v v v v > Peter Reinhardt | Maître de Conférences < > Lab. Chimie Théorique | (HDR) < > Université Paris VI | < > 4 place Jussieu, case 137 | Tél.: +33(0)1 44 27 9657 < > F -- 75252 Paris, France | Fax.: 4117 < > email: Peter.Reinhardt(a)upmc.fr < > Web: http://www.lct.jussieu.fr/pagesperso/reinh < ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

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exam
by Gergely Buday 16 Jun '08

16 Jun '08

Dear CentOS users, is it possible to prepare for a certified (big North American Linux vendor) engineer exam with a CentOS install ? I have heard that the test contains questions on specific GUIs, are they included in the CentOS distribution? - Gergely

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mdadm on reboot
by drew einhorn 16 Jun '08

16 Jun '08

Hi, I'm in the process of trying mdadm for the first time I've been trying stuff out of tutorials, etc. At this point I know how to create stripes, and mirrors. My stripe is automatically restarting on reboot, but the degraded mirror isn't. -- Drew Einhorn

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Re: CentOS Digest, Vol 41, Issue 14, Network FS w/o user setup
by Rodney Mercer 16 Jun '08

16 Jun '08

> ------------------------------ > > Message: 11 > Date: Fri, 13 Jun 2008 14:01:14 -0500 > From: Les Mikesell <lesmikesell(a)gmail.com> > Subject: Re: [CentOS] Network FS w/o user setup > To: CentOS mailing list <centos(a)centos.org> > Message-ID: <4852C3FA.6040901(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Johnny Hughes wrote: > > > > You would then need to setup "Samba Authentication" for your Linux > > Client machines. > > > > The best method to do that depends on your business, who you have to > > interface with, what services you are running on the network, etc. > > > > I run a Samba PDC (using LDAP as a backend) with Samba BDC's in several > > remote locations. If you do not require ADS network, then this can work > > great as LDAP databases can be replicated from the PDC to the BDCs and > > Linux machines can easily be setup to use LDAP for authentication. > > > > However, if you need an ADS domain, then the LDAP method does not work > > since Samba can not be a Domain Controller for ADS. That would require > > you to be a Domain "Member Server" and enable samba authentication for > > Linux clients. > > I've been able to use SMB authentication against an AD just by filling > in the entries in system-config-authentication. I'm not sure if that > requires any compatibility settings on the AD side or not - it just > worked for me so I didn't ask questions. The down side is that you do > have to add the users and maintain groups on the linux side which isn't > too difficult if they don't change a lot, just > adduser -u uid -g gid login_name > with the same values on all the boxes and copy changes to /etc/group > around. The up side is that you can control which users have access > separately and only have to deal with passwords for users that aren't in > AD - and you don't have to ask permission to join the linux boxes to the > domain. > > > The methods to do that are too hard to explain on list. Much research > > needs to be done on samba.org docs (assuming you already understand the > > whole Windows Domain concept and how it works on Windows). The way that > > you will proceed is an infrastructure decision and based your individual > > needs and infrastructure. > > Winbind can automatically create users from AD, but you have to join the > domain and I'm not sure what you have to do to coordinate the uid > mapping across machines so NFS shares work. > > -- > Les Mikesell > lesmikesell(a)gmail.com > > > > ------------------------------ I moved a RHEL4 machine so that it could authenticate logins from a different ADS domain than the one I originally set it up for. I have done this before, and found it to be a bit of a pain to make UNIX UID/GIDs, to ADS SID mappings the same on multiple machines. I had found a utility called wbuser , http://www.occam.com/tools/README.wbuser-1.1 , that could delete and add the UID to SID mappings but did not work for GID to SID mappings. Fortunately, I found that I could just copy the Trivial Data Base (TDB) file called winbind_idmap.tdb from one machine to all the others, and then start the samba smb and winbind daemons afterwards. Since all the machines have the same mappings, they can share nfs mounts and the file and directory ownerships are consistent across the multiple machines. Rodney Mercer

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