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Network interface status
by isdtor 21 Mar '13

21 Mar '13

Under CentOS6, is it possible to get an interface to RUNNING state without assigning a (dummy) IP address? # ifconfig em2 em2 Link encap:Ethernet HWaddr 78:2B:CB:67:3E:5C UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) This was working fine on RHEL3 simply by running ifconfig up. # ifconfig eth1 up # ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:11:25:57:8B:2D UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:10658057 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1169901971 (1115.7 Mb) TX bytes:0 (0.0 b) Base address:0x3400 Memory:d0240000-d0260000 # dmesg |grep eth1 ... e1000: eth1: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex # provided there is a link.

2 1

change /etc/security/limits.conf need reboot or not?
by mcclnx mcc 21 Mar '13

21 Mar '13

We have CEntos 5.5 on DELL server. Due to more and more databases run on same server sometime processes number read max and cause 'resource temporary unavailable". I plan to change /etc/security/limits.conf value: oracle soft nproc 2047 ==> 4096 Do i need reboot to make it effect? How to test change is effect? Thanks.

4 3

Adding third party driver at installation time.
by satish kondapalli 21 Mar '13

21 Mar '13

Hi, I have a PCIe storage device. My driver registers this device as a block device in linux. My block device is working fine under linux. Following are the steps which I used for Centos installation on my storage device: 1) During Centos installation time and before scanning of my storage device, I loaded the driver from command line(By pressing Ctrl + Alt + F2) from USB disk. 2) Post loading of drivers, the installation proceeded successfully on my storage device. Query: 1) How to add my driver as part of installed initrd image at the installation time itself.[because root file system also installed on same device] Waiting for positive reply Thanks & Regards, Sateesh

2 3

2 questions re UPS management
by Fred Smith 21 Mar '13

21 Mar '13

Hi, trying to figure out how the system manages UPS connections. On both Centos 5.9 and 6.4, merely plugging in a USB UPS device causes an icon to appear in the top panel, and (at least on 5.9, haven't yet tested this in 6.4) when the UPS suffers a power failure the system notices and after a bit does a clean shutdown. All this without installing ANYTHING extra. one of the UPSes I'm using is a tripplite (now on 6.4 x86_64, but formerly on the same machine with 5.9 i686), the other is a CyberPower UPS on a different 5.9 machine. question #1: in 5.9 there are two entries in /etc/inittab, one for power fail and the other for power restoration. The default setting for the powerfail entry has it doing a shutdown in 2 minutes. So, I need to tweak it a bit: that UPS powers two computers, the Centos 5.9 box and a Windows XP box. A little googling showed me how to use Samba tools to tell XP to do a shutdown. That works fine. but if I add the command for that into the inittab entry I get an error message (when power fails) about the line being too long. So, I created a shellscript that runs both the command to tell XP to go down, followed by the shutdown command that tells Centos to shut down. I changed the two minute time to 5 minutes to make sure Windoze is all the way down even if it's busy. When I run this script from the commandline it works just fine. but when I turn off input power to the UPS it starts the XP shutdown then within without waiting the specified length of time, initiates the shutdown of Linux. Once the shutdown is done, the UPS powers off, thereby killing the not-yet-shutdown windoze box. #!/bin/sh # # invoked by the poweroff clause in /etc/inittab instead of the command # originally in that place. This one also shuts down the Windoze box. net rpc SHUTDOWN -C "System shutting down NOW due to power failure" -f -I 172.19.23.120 -U <myusername>%<mypassword> /sbin/shutdown -f -h +5 "Power Failure; System Shutting Down" and here's the entry from inittab: pf::powerfail:/etc/powerfail The shellscript does contain "#!/bin/sh" as its first line, but it is currently being invoked simply by the path to the script. when I get back to the office I'll try changing it to "/bin/bash /etc/powerfail" to see if that makes a difference, but I kinda don't expect it to. So, I'm wondering how the underlying mechanism works, AND if anyone knows how (or even IF) it's possible to hand inittab a script to run instead of burying the necessary commands directly into the inittab entry. Question #2: On the Centos 6.4 box at home, I haven't yet tried turning off power to the UPS to see if it actually shuts doown, but given that a UPS icon appears in the panel, and there are settings for what should happen when power fails, I expect it will. The question here is: how does this magic all work? We no longer have any entries in inittab to manage this, apparently we now use upstart to manage the same things, and I've spent some time digging for man pages and looking around for upstart file(s) to find out how such events are handled, and so far I've not found anything specifically for a "powerfail" event. Clues appreciated, thanks all! Fred -- ------------------------------------------------------------------------------- Under no circumstances will I ever purchase anything offered to me as the result of an unsolicited e-mail message. Nor will I forward chain letters, petitions, mass mailings, or virus warnings to large numbers of others. This is my contribution to the survival of the online community. --Roger Ebert, December, 1996 ----------------------------- The Boulder Pledge -----------------------------

9 28

boot problem on Desktop edition 6.4
by Mustafa DEMiRCi 21 Mar '13

21 Mar '13

Hi dear friends for three days . I have a problem . Shortly I have Hp elitebook with Centos 6 nearly more than one year without any problem When last update for kernel 2.6.32-358.2.1.el6.x86_64 was realeased. I did not restart machine. After 3 days I started machine and I got a error message of getaddrinfo() problem of solving host name. And there is showed of bugs.centos.org. I reconfig /etc/hosts and restart machine after startin libvirtd (OK) There is nothing. I can't see my gnome desktop (Maybe this was a problem of another update which was same time with 2.6.32-358.2.1.el6.x86_64 ) Some googling and looking some forums I saw another people like me They have same problems. I reinstall kernel and tried alternatives/java but couldn't solve problem. yum reinstall \* did not solved my problem . After starting libvirtd(OK) . There is nothing . Maybe this is coming from my Nvidia card ? Have you any ideas ? Regards. Mustafa Demirci

1 0

CentOS: Install Packages Via yum Command Using DVD / CD as Repo
by Al Sparks 21 Mar '13

21 Mar '13

I'm confused about this. Is this supposed to work without me mounting my CD/DVD? If you are supposed to mount it, what path should you use to make this work? http://www.cyberciti.biz/faq/centos-linux-install-packages-from-dvd-using-y… === Al

3 2

Advanced Persistent Threats; Why aren't we confining Firefox and Evolution?
by David McGuffey 21 Mar '13

21 Mar '13

Moat of the advanced persistent threats (APT) are initiated via e-mail. Opening an attachment or clicking on a web link starts the process. Why isn't Firefox and Evolution confined with SELinux policy in a way that APT can't damage the rest of the system? Why are we not sandboxing these two apps with SELinux? I've discovered some guidance for sandboxing Firefox using the 'sandbox' command. Once I test it a bit, I'll post the results back here. Seems to me that if this works, it should be the default. DaveM

4 7

Newer version of ftdi_sio
by Stephen Harris 20 Mar '13

20 Mar '13

I have just bought an FTDI USB UART New USB device found, idVendor=0403, idProduct=6015 New USB device strings: Mfr=1, Product=2, SerialNumber=3 Product: FT231X USB UART Manufacturer: FTDI However this appears to be slightly too new for the ftdi_sio driver in C6.4; it's not detected. If I force it modprobe ftdi_sio vendor=0x0403 product=0x6015 then it gets detected as a FT232RL which is _close_... but doesn't seem to quite work. If I use "kermit -l /dev/ttyUSB0 -C 'transmit foo,quit'" then I get "Timeout" errors from kermit. If I plug the same adapter into a Ubuntu 12.10 instance it detects as FT-X and the same kermit command works correctly. So I guess I need a newer ftdi_sio driver; has anyone built such, or have instructions? -- rgds Stephen

1 0

Warning Error procesing LVM.
by Rob Townley 20 Mar '13

20 Mar '13

Warning Dialog Box that appears when trying to use CentOS 6.4 32bit to upgrade a preupgrade failure of Fedora 13 to Fedora 15. Need to make certain Re-initialize will not delete all my files, but just rebuildable metadata. "There is inconsistent LVM data on Volume Group vg_ec239dict. You can reinitialize all related PVs (/dev/sdb2, /dev/sda2) which will erase the LVM metadata, or ignore which will preserve the contents. This action may also be applied to all other PVs with inconsistent metadata." clickable options are: Ignore Ignore all Re-initialize Re-initialize all

1 0

difficulty saving pdfs
by Michael Hennebry 20 Mar '13

20 Mar '13

Often when I try "Save a copy" from a pdf viewer, I get a nyet, no such file as /tmp/s.../... . Making the indicated directory allows the save. What is the problem? Is it a gnome thing? What can I do to fix it? -- Michael hennebry(a)web.cs.ndsu.NoDak.edu "On Monday, I'm gonna have to tell my kindergarten class, whom I teach not to run with scissors, that my fiance ran me through with a broadsword." -- Lily

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