Discuss September 2010

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225 participants
167 discussions

Using Make in frequent cron job
by Kenneth Porter 20 Sep '10

20 Sep '10

Is there a way to get Make to be silent when it does nothing, but have its normal verbosity when something is made? I want to use Make in a frequent cron job (every 1/2 hour, perhaps 10 minutes) but I don't want to get a bunch of emails telling me nothing was done (which will be most of the time). I just want to know when it found something to do.

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Re: [CentOS] Using Make in frequent cron job
by Chad Woolley 20 Sep '10

20 Sep '10

On Sun, Sep 19, 2010 at 6:58 PM, Kenneth Porter <shiva(a)sewingwitch.com> wrote: > Is there a way to get Make to be silent when it does nothing, but have its > normal verbosity when something is made? You can write a wrapper script and run it in a subshell to capture the output. Pretend echo is make: a=$(echo 'made something') # no output if echo $a | grep 'made something' > /dev/null; then echo $a fi HTH, -- Chad

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GRUB woes: GRUB Hard Disk Error
by Rob Del Vecchio 20 Sep '10

20 Sep '10

Hello all, I am attempting to install CentOS 5.5 on a recently donated home server (was Windows). I've tried installing twice; first, separating /boot, swap, /, /var, /usr and /home into different partitions, the second time choosing default layout. Both times have resulted in "GRUB Hard Disk Error" upon boot. About the hard disk, it is a Seagate SATA drive. I do not have another drive to configure RAID. The BIOS is set to: Onboard PATA/SATA Adapters = Both SATA mode = IDE Onboard PATA/SATA Cofiguration = Enhanced Mode (???) Upon booting into rescue mode, the file systems mount successfully and I am able to read data from files. The current file structure is (default layout): /boot / swap grub.conf: #boot=/dev/sda1 default=0 timeout=5 splashimage=(hd1,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-194.el5) root (hd1,0) kernel /vmlinuz-2.6.18-194.el5 ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-194.el5.img title Other rootmoverify (hd0,0) chainloader +1 This is brand new from the installation. My questions are, what am I missing? Bad configuration? Should boot=/dev/sda1 really be commented out? Some pointers for manually installing and configuring grub would be great, as I am lacking experience in that area. Any idea as to what is going on would be great! Thanks in advance, Rob

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Issue with HP Officejet 6500 on CentOS 5.5
by Mark 19 Sep '10

19 Sep '10

I just picked one of these up to replace my 4315, which broke (I think the feeder roller gear broke from an overstuffed feeder), but it's giving me problems. I had no trouble configuring it to print, but it doesn't appear in lsusb and xsane can't find it, so I can't scan with it, which is the main reason I bought it in the first place. I've tried restarting the autofs service (automounter), rebooting, and switching the USB cables with my old HP Scanjet 3300C, but the 3300 shows up on either cable and the 6500 doesn't appear at all. I checked in Google and saw other issues with the 6500, but this wasn't one of them. Any suggestions? I suppose I could get a switch and hook it up via Ethernet, but that really isn't a good solution, and it doesn't explain the problem. Thanks. Mark

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NX and CentOS 5.5?
by Raymond Jender 19 Sep '10

19 Sep '10

I am pulling my hair out here folks...... I am running CentOS 5.5 in command line only. Reason being I am standing up an IDS system on it. I have installed the NX client/node and server pkgs. I have installed the NX client for windows on a Vista box. When I attemtp to connect from the Vista to CentOS, I get this: NX> 203 NXSSH running with pid: 22080 NX> 285 Enabling check on switch command NX> 285 Enabling skip of SSH config files NX> 285 Setting the preferred NX options NX> 200 Connected to address: 192.168.1.70 on port: 22 NX> 202 Authenticating user: nx NX> 208 Using auth method: publickey NX> 204 Authentication failed. Now I have been googling and re-googling. Plenty of people have had the same issue, but I have yet to find a solution that works for me. Funny that most of the stuff I'm finding on google is 4-5 years old! I'm sure I am probably missing something so simple I will puke! I think I read that someone did an install and it worked right out of the box!! Incredible! I'd really like to see a CentOS - NX configuration guide but couldn't find one. Can someone just tell me how this should be configured....what changes do I need to make and to what config files? ssh (putty and WinSCP) works just fine for me in case you need to know. If you need any particular information, please let me know. Thanks. Ray

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should vsftpd be disabled in favour of sftp for security reasons?
by Robert P. J. Day 19 Sep '10

19 Sep '10

(another in an ongoing list of things i just want to clarify for the sake of future courses taught on centos.) from this RHEL doc page: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Deploymen… the reader is advised to, for the sake of security, remove/disable vsftpd, ostensibly in favour of sftp/sftp-server. really? i can obviously see disallowing stuff like telnet and rsh and rlogin, that's a no-brainer. but advising against vsftpd for the sake of security? i'm not sure i see the logic in that. thoughts? rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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Ac1dB1tch3z Vs Linux Kernel x86_64 0day
by Gerhard Schneider 18 Sep '10

18 Sep '10

Are there any 64bit CentOS5 kernels available that are immune against the exploit mentioned in the subject? Turning off 32bit support is no option to me.. Gerhard Schneider P.S.: Source code can be found at http://seclists.org/fulldisclosure/2010/Sep/268 and is working "well" on 2.6.18-194.11.3.el5.centos.plus -- Gerhard Schneider Institute of Lightweight Design and e-Mail: gs(a)ilsb.tuwien.ac.at Structural Biomechanics (E317) Tel.: +43 664 60 588 3171 Vienna University of Technology / Austria Fax: +43 1 58801 31799 A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/

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securing centos 5.2 for public usage
by Roland RoLaNd 18 Sep '10

18 Sep '10

Dear all, i Just finished setting up an apache service on a centos 5.2 VM machine. i need to secure this machine as i'm soon to be setting a public IP over it where i'd be opening up the following services: 1. http 2. https 3. ssh Things i've done so far: 1. stopped root ssh access in sshd.conf 2. tried configuring PAM so i get a more secure ssh passwords (dictionary wise) as well as tried setting up a 2 times authentication failure for the account to be disabled for 12 hours (i couldnl't succeed in setting this up) 3. disabled port forwarding (to deny outsiders to tunnel through the server inside my network) couldn't succeed with this either. Any help or advice would be greatly appreciated.. thanks, --Roland

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Maximum IP ranges
by Radu Gheorghiu 18 Sep '10

18 Sep '10

Hello, Is there any maximum number of IP aliases or IP ranges that ifup can handle? Right now i have about 12000 IPs assigned to the server and when trying to assign range number 47 (ifup eth0-range47), i get his error: /etc/sysconfig/network-scripts/ifup-post: line 21: 12733 Segmentation fault /etc/sysconfig/network-scripts/ifup-aliases ${DEVICE} ${CONFIG} Any advice is much appreciated. Regards, Radu

1 0

looking for cool, post-install things to do on a centos 5.5 system
by Robert P. J. Day 18 Sep '10

18 Sep '10

(note: i asked this a few days ago but it *appears* that that post was tossed due to getting excessive bounces from my account. so i'm posting it again, apologies if you're seeing it a second time.) over the next several weeks, i'm teaching some courses in RHEL admin but (unsurprisingly) i'll be using centos 5.5. it's a decently-written, 3rd party course, all the generic, standard admin topics but it does leave me about a 1/2 day to throw in any cool stuff i want to add. so, any recommendations for neat things that people here have done in the way of what can be added to or configured on a centos server system? the course covers all the standard topics -- installation, package management, service management, filesystem maintenance, that sort of thing. so i'm looking for bonus, neat stuff that others here do as a matter of course when putting together a centos system. logging utilities? intrusion detection? monitoring? anything that leaps to mind that i can use to fill up a few more hours. i'm already thinking of showing how to build and boot a new kernel. other ideas? thanks. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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Discuss September 2010