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34758 discussions

rsyslog as default syslog daemon?
by Andrej Moravcik 01 Dec '10

01 Dec '10

Hi all! Is anybody here using rsyslog? I am looking for the right solution how to use rsyslog in CentOS 5 as the default logging daemon. We use it because of filtering using regular expressions. I switched from sysklogd to rsyslog simply using chkconfig --del syslog chkconfig --add rsyslog chkconfig rsyslog on service syslog stop service rsyslog start but this seems not to be "bullet-proof" solution - when yum automaticaly install updates, sysklogd rpm package runs postinstall scriptlet which unfortunately returns sysklogd back to game (and breaks logging based on regex). # rpm -q --scripts sysklogd postinstall scriptlet (using /bin/sh): if [ "$1" -ge 1 ]; then /sbin/chkconfig --add syslog <<HERE for n in /var/log/{messages,secure,maillog,spooler} do [ -f $n ] && continue touch $n chmod 600 $n done /sbin/service syslog condrestart > /dev/null 2>&1 fi exit 0 ... # chkconfig --list syslog syslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off Meanwhile, automatic update of rsyslog package results (thanks to postinstall scriptlet) into disabled rsyslog :-/ ... # rpm -q --scripts rsyslog postinstall scriptlet (using /bin/sh): /sbin/chkconfig --add rsyslog <<HERE for n in /var/log/{messages,secure,maillog,spooler} do [ -f $n ] && continue umask 066 && touch $n done ... # chkconfig --list rsyslog rsyslog 0:off 1:off 2:off 3:off 4:off 5:off 6:off - uninstalling sysklogd package will not solve the problem of disabling rsyslog after yum update. Or should I uninstall it and simply change '# chkconfig:' part of rsyslog rc script? - I don't want to disable automatic updates of sysklogd and rsyslog packages using /etc/yum.conf:exclude=... bacause of security reasons. - I think about using 'alternatives', but I am not sure if it is the appropriate solution. - should I report to Red Hat's bugzilla? Maybe I overlooked something in documentation. Thank you for any advice and patience. Andrej

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tmpfs says "No space left on device"
by Adam Tauno Williams 01 Dec '10

01 Dec '10

I have a server where we use tmpfs as a cache for temporary files used by a web application. But occasionally this tmpfs thinks it is full when it isn't. [root@flask-yellow tmpfs]# touch file touch: cannot touch `file': No space left on device [root@flask-yellow tmpfs]# df -k Filesystem 1K-blocks Used Available Use% Mounted on none 393216 19296 373920 5% /srv/tmpfs Simply unmounting and remounting /srv/tmpfs resolves the issue. 2.6.18-164.11.1.el5 Any suggestions as to the cause of this or workarounds are appreciated.

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Guide to SELinux
by Rob Del Vecchio 01 Dec '10

01 Dec '10

Since the "SELinux - way of the future or good idea but !!!" thread is deep in heated discussion, I decided not to derail to ask a simple question. I found this guide for SELinux: http://www.linux-books.us/centos_0005.php and it looks like it's straight out of RedHat. However, it's dated 2005. Will this be sufficient to help understand a CentOS 5 - or 6 - installation of SELinux? Is there a more recent guide (freely) available out there? Thanks in advance, Rob

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Converting to Raid1
by Matt 01 Dec '10

01 Dec '10

Have a CentOS 4.x 32 bit server running on a single 500M SATA drive. What is easiest way to convert too RAID 1 on it? Anyone have a link? Would be open to hardware or software just do not want to reinstall the entire mess.

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Minimising disk I/O
by Keith Roberts 01 Dec '10

01 Dec '10

I'd like to get disk I/O down to a minimum for my new Centos 5.5 installation. The machine will not be used as a web server anymore, as that's now hosted on a cloud platform. So there are no HTTP requests coming down the line. If I move the SWAP partition and /var/log/ to a small spare drive, and install Centos on the new larger drive, is there anything else that would cause disk activity on the main drive, when the machine is running but not in use? fetchmail will be collecting my email hourly, but I'd like the drive to spin down and go into hibernate mode if possible. I have a backup drive that gets woken up once an hour to backup email, and also during the night to make backups of specified directories every 24 hours. Apart from that, the drive is not in use, unless I run a backup script manually. So I'm hoping to do the same for the main drive if that's posible? Kind Regards, Keith Roberts -- In theory, theory and practice are the same; in practice they are not. This email was sent from my laptop with Centos 5.5

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centos 5.5 - not detecting internet connection
by Johan Scheepers 01 Dec '10

01 Dec '10

Good day, By accident booted with dsl internet not connected. When reconnecting dsl - centos did not detect it. Is there a way to make it trigger detection rather then rebooting Please. Thanks Regards Johan

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Samsung CLP-325W network connection?
by Timothy Murphy 01 Dec '10

01 Dec '10

Anyone got this working over a LAN under CentOS? The instructions claim it is easy to connect after pressing the WPS button on printer and router. Sadly, I don't see a WPS button on my Linksys WRT54GL router. When I press the WPS button on the printer the WiFi icon flashes, but I don't see any attempt to connect in /var/log/messages on my CentOS-5.5 server. Any advice or suggestions gratefully received. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Help with yum and cpio: MD5 sum mismatch
by James B. Byrne 01 Dec '10

01 Dec '10

I am trying to install Ruby-1.8.7p302 on a CentOS-5.5 server in preparation for a Rails-3 application deployment. I have downloaded the source from Rubyforge.org, unpacked it, and ran ./config and make. Everything built without error. I then ran checkinstall to create an rpm package. That too completed without error. However, when I try to install the resulting package using: yum localinstall /path/to/package --nogpgcheck I get this message: . . . Running Transaction Installing : ruby-1.8.7 1/1 Error unpacking rpm package ruby-1.8.7-p302-1.i386 error: unpacking of archive failed on file /usr/bin/make;4cf56119: cpio: MD5 sum mismatch Failed: ruby-1.8.7.i386 0:p302-1 Does anyone here know how to work around this? -- *** 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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Re: [CentOS] SELinux - way of the future or good idea but !!!
by brett mm 01 Dec '10

01 Dec '10

> > This is where, as a sysadmin, you need to invest just a little time and > effort learning the system. Honestly, the vast majority of issues are > trivial to solve if you just spend a few hours reading the docs/guides, > and even if you really can't be bothered there are kind folks on this > list (and others) that will likely solve your issues for you. How is > that not worth the extra security SELinux affords? > In reality, I am not at all sure that a quantum leap in complexity adds to security at all. Any proper use of old-school group permissions can give as finely-grained a security policy as you would like. The time spent running SELinux in permissive mode to configure could better be spent looking for holes in the operating system, or helping patch the many bugs that the speedy Linux development schedule lets through: http://lwn.net/Articles/409954/ And then we could have real security, and not a false sense of security generated by heavy-sounding phrases like "mandatory access controls." :-)

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linux-2.6.18.tar.bz2 is missing
by Pascal Robert 30 Nov '10

30 Nov '10

We have to rebuild our kernel to add support for a Mainpine fax board on a CentOS 5.5 board: http://www.hylafax.org/content/Handbook:Basic_Server_Configuration:Modem-sp… We followed all steps, but when calling rpmbuild, we are getting: [root@hylafax SPECS]# rpmbuild -ba --target x86_64 kernel-2.6.spec Construction pour plate-formes cibles: x86_64 Construction pour cible x86_64 erreur: Fichier /usr/src/redhat/SOURCES/linux-2.6.18.tar.bz2: Aucun fichier ou répertoire de ce type So it doesn't find linux-2.6.18.tar.bz2 We do have both the kernel-devel and kernel-headers packages installed, so I don't understand why that file is missing. Googling for "linux-2.6.18.tar.bz2 is missing" didn't bring any useful info. So where/how can we rebuild or get that archive?

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