[CentOS] Define an alias with an embeded awk command error ?
Hi, guys:
I'm trying to define an alias in .cshrc with the embeded awk command,
like this :
alias checketh0 "ip add ls eth0 |awk '/inet/{print $2}' |sed -n '1p' "
Then i run "source ~/.cshrc" and run "checketh0" command in the terminal ,
but the result is the following :
" inet 192.168.18.18/24 brd 192.168.18.255 scope global eth0"
but i want this result :
192.168.18.18/24
How do I do it ? Any help will be highly appreciated.
Thanks for you help ~
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[CentOS] Is parralel processing automatically done on multi-core CPU's?
Hi, I just noticed this article, http://www.howtoforge.net/fully-utilizing-your-x-core-cpu which uses http://code.google.com/p/ppss/ for parralel processing. So, can anyone tell me if parralel processing happens automatically on CentOS, or would I need to use this script as well? We mainly have Dual Core & Dual CPU, Dual Core (i.e. 8 cores) servers and it would be benefitial to know whether any applications on the server could automatically use all 8 cores, or whether I need todo something on the servers to get this working? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Is parralel processing automatically done on multi-core CPU's?
On Sat, Mar 6, 2010 at 1:51 AM, Rudi Ahlers wrote: > Hi, > > I just noticed this article, > http://www.howtoforge.net/fully-utilizing-your-x-core-cpu which uses > http://code.google.com/p/ppss/ for parralel processing. > > So, can anyone tell me if parralel processing happens automatically on > CentOS, or would I need to use this script as well? We mainly have Dual Core > & Dual CPU, Dual Core (i.e. 8 cores) servers and it would be benefitial to > know whether any applications on the server could automatically use all 8 > cores, or whether I need todo something on the servers to get this working? > I haven't read the articles, but in general the answer is yes and no. Linux is a multiprocessor capable OS that will automatically use as many processors as are available and needed to run whatever is in the running process mix. However, if your application is single-threaded, it can't be multi-processed because the OS has no way of knowing how that should be done. In order to be run in parallel (note spelling, pls), an application has to be written to run multiple threads of control be they Linux threads, multiple processes or whatever. Most modern OSs are inherently capable of parallel operation because they will use as many processes and threads as they need to run the hardware and support system and user processes that are enabled to do the same. So, if you want an application to run in parallel, it must be written to be parallel capable - multiple threads that operate at least partially independently with appropriate controls to synchronize critical resources without livelocks or deadlocks. I don't know the internal structure of apps I haven't written or worked on, but I'm pretty sure OOO and probably a fair number of the graphical and multimedia apps are multiprocessor capable. The big advantage to having multiple CPUs is being able to run multiple processes simultaneously, whether that's one multithreaded app or <#-of-CPUs> different apps, multithreaded or not. There are other performance issues that also need to be taken into account, but that can get fairly complex and is not necessarily on point. Mark Hull-Richter Expert Software Developer Registered Linux User #472807 - sign up at http://counter.li.org/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] iptables bugs going untended?
You should be aware that such bugs will not get fixed in CentOS, they have to get fixed in RHEL. You cannot rely that if you put a bug in the CentOS bugtracker that is reentered by someone else in the RHEL bugtracker. So, if you want to have this resolved you should file it on the RHEL bugzilla as well. Kai -- Get your web at Conactive Internet Services: http://www.conactive.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Define an alias with an embeded awk command error ?
Am 06.03.2010 09:47, schrieb sync:
> Hi, guys:
>
>I'm trying to define an alias in .cshrc with the embeded awk command,
> like this :
>
> alias checketh0 "ip add ls eth0 |awk '/inet/{print $2}' |sed -n '1p' "
>
> Then i run "source ~/.cshrc" and run "checketh0" command in the terminal ,
> but the result is the following :
>
>" inet 192.168.18.18/24 brd 192.168.18.255 scope global eth0"
>
> but i want this result :
> 192.168.18.18/24
>
>
> How do I do it ? Any help will be highly appreciated.
>
>
> Thanks for you help ~
Within your awk statement the "$2" is eaten and thus awk prints the
whole line.
You can bypass this using following in your .cshrc
set eth0=`/sbin/ip addr ls eth0 | awk '/inet/ { print $2; exit }'`
alias checketh0 "echo $eth0"
Alexander
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[CentOS] SNI Apache
Hello, Anyone knows a repository with apache + mod_ssl + openssl + (other openssl programs) with SNI support. I have tried someone but obtain brutal production server crash, because (now!!! I remember) ssh uses openssl... Anyone knows CentOS compatible posible update? Thanks in advance. -- -- -- http://www.pas-world.com/ http://www.precioventa.com/ http://www.1pc.es/ -- -- ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] [Solved] BMC IPMI configuration on centos 5.4 64 BIT Server
hI all , I configured the IPMI Setting with the help of Intel management cd no my imitool as well fence_ipmilan works like an charm on all the 25 nodes. On Thu, Mar 4, 2010 at 9:52 AM, Rajagopal Swaminathan wrote: > Greetings, > > On Thu, Mar 4, 2010 at 12:39 AM, Joseph L. Casale > wrote: >>>Really its very urgent i have to handover the server in next 12 hours. > > If you are in India, get somehow the APC or any other power fencing or > put the authorities on to me I will tell and educate them. > > I don't trust HCL much. > > Regards, > > Rajagopal > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Linux printing server?
hello all, is there any other way to setup some kind of service that converts user's printed jobs to pdf files other than ghostscript + samba? if theres none, can any1 help me set ghostscript + samba up? __ Information from ESET Smart Security, version of virus signature database 4755 (20100108) __ The message was checked by ESET Smart Security. http://www.eset.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Linux printing server?
On Sat, 2010-03-06 at 21:33 +0200, Roland Roland wrote: > is there any other way to setup some kind of service that converts > user's printed jobs to pdf files other than ghostscript + samba? cups-pdf -- MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] compilers a security risk?
I manage a web hosting server that we've recently upgraded, in part so we could accommodate a domain that will enable community mapping. In a recent exchange of mails one developer said: "I could build the package directly on the server machine you have, provided that the potential security risk posed by having compilers installed is not an issue." and another said: "What sort of security risk is there in having compilers installed on a working server? "Obviously we can remove the compilers, however when Mapserver or postgis get updated, we will need to build new packages somewhere. One option: create a second VM for mapchat. We'll put the build environment on it, and only turn it on to make new packages." I don't have enough experience to assess the security issues. Does anyone have an opinion on this? It would be simple and feasible to allocate another domain as suggested above. Dave -- "It is no measure of health to be well adjusted to a profoundly sick society." Krishnamurti ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] compilers a security risk?
Dave Stevens wrote: > I don't have enough experience to assess the security issues. Does > anyone have an opinion on this? It would be simple and feasible to > allocate another domain as suggested above. Unless your running an obscure platform having a compiler on the system shouldn't be a big deal, if you can upload source code, you can upload a precompiled binary nate ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] compilers a security risk?
On Sat, Mar 6, 2010 at 6:02 PM, Dave Stevens wrote: > I don't have enough experience to assess the security issues. Does > anyone have an opinion on this? It would be simple and feasible to > allocate another domain as suggested above. The compilers themselves aren't really a security risk, but IF someone gets into your system, there's no need to provide them with tools they can use to do their dastardly deeds. I'm a minimalist when it comes to my production systems. Not having extraneous packages on the system means (ostensibly) less patching, less applications with potential holes which in turn means less surface area to attack, etc. -- During times of universal deceit, telling the truth becomes a revolutionary act. George Orwell ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] is it possible to recover LVM drive from accidental Fdisk?
Hi all, Does anyone know if it's possible to recover an LVM partition from a drive that was fdisked? I accidently fdisk'd the wrong drive (had to fdisk a lot of 160GB drivers from old servers and one still has important data on that client now wants) by running fdisk /dev/sdc & deleting the partitions. The drive is still in a another machine and hasn't been rebooted yet, but there's no no partition on it. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to recover LVM drive from accidental Fdisk?
Rudi Ahlers wrote: > Hi all, > > Does anyone know if it's possible to recover an LVM partition from a drive > that was fdisked? I accidently fdisk'd the wrong drive (had to fdisk a lot > of 160GB drivers from old servers and one still has important data on that > client now wants) by running fdisk /dev/sdc & deleting the partitions. The > drive is still in a another machine and hasn't been rebooted yet, but > there's no no partition on it. re-create the original partition table, which is just a map, as long as you haven't formatted or overwritten data everything should still be there Also suggest if your not already doing it set your LVm partitons to type 8e so it's obvious they are LVM [r...@dc1-mysql001b:~]# fdisk -l /dev/sdc Disk /dev/sdc: 2197.9 GB, 2197949513728 bytes 255 heads, 63 sectors/track, 267218 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdc1 1 267218 2146428553+ 8e Linux LVM nate ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
