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Some thoughts about EL 6
by Gerhard Schneider 18 May '11

18 May '11

Many people seem to wait for the announcement of CentOS 6.0, so I want to share some test results I did with SL 6.0.. The actual 6.0 kernel can NOT allocate tape buffers when the server is heavily loaded at least on some LSILogic hardware. There is a big problem of slab buffer increase that can cause reboot/freeze of the server under load. Reported by many and verified by me :-( So perhaps it's a good idea to wait for 6.1 for mission critical servers.. Gerhard Schneider -- Gerhard Schneider e-Mail:gs@ilsb.tuwien.ac.at Institute of Lightweight Design and Tel.: +43 1 58801 31716 Structural Biomechanics (E317) Fax.: +43 1 58801 31799 Vienna University of Technology / Austria DVR: 0005886 A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/

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Problem Making Tarballs
by John J. Boyer 18 May '11

18 May '11

I have a CentOS virtual private server from 1and1.com If I checkout or pull something from a repository, it will contain an autogen.sh file Running this and then configure seems to work. However, when I run make I get a lot of error messages from libtool saying that such and such a command could not be found on some line or that there is a syntax error. This happens even with the latest updates. Several people have been unable to help. What is the problem, and what should I do about it? Thanks, John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities

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Re: [CentOS] a hardware question
by aly.khimji＠gmail.com 17 May '11

17 May '11

Indeed I agree, we are a full IBM shop and after working with there gear for a very long time, I also suggest the same, this will ensure you get everything you need and all the correct parts to get you back asap. Its just a safe bet with IBM. Aly ------Original Message------ From: John R Pierce Sender: centos-bounces(a)centos.org To: centos(a)centos.org ReplyTo: CentOS mailing list Subject: Re: [CentOS] a hardware question Sent: May 17, 2011 4:47 PM On 05/17/11 12:49 PM, m.roth(a)5-cent.us wrote: > We need to replace several servers, quickly - four of our Dell PE 1950's > died in one week. (!!!) So, we're looking around, and I was checking out > IBM. I customized to what we want, and hit 'continue', and suddenly > there's another $800 for a "system common planar" that's "required". > Googling only finds specs with it - does anyone know what it is? I mean, > it's not like it's the motherboard, right? indeed, Planar is IBM-speak for a mainboard. IBM has a lot of their own unique terminology. For ages disk drives were called DASD (Direct Access Storage Devices). generally, on the IBM 'express' configurations, everything required is included in the base configuration. sounds like you were off in their custom build land, which is mostly intended for bulk orders and everything is /a la carte/. I *highly* recommend working with an IBM VAR who will sort out the configurations for you. _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos Sent from my BlackBerry device on the Rogers Wireless Network

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So sorry! was: Re: EL 6 rollout strategies? (Scientific Linux)
by Benjamin Smith 17 May '11

17 May '11

As the OP for this thread, it saddens me to see that the thread I started has now been used as a forum for behavior of the worst kind seen in professional circles. I'm a longtime user of CentOS and merely wanted to know of users' past experiences transitioning between SL and CentOS. My first experience with CentOS was as a transition from Whitebox to CentOS, and the process was as simple as swapping out perhap 3 RPMs and a "yum update". That's it, and that same server is still chugging along today many years later. Both CentOS and WBEL had the same goal, near-perfect compatibility with RHEL, but SL has slightly different goals. What are users' past experiences doing a "hot swap out" of SL for CentOS and/or vice versa? I have tremendoud respect for the CentOS project. The developers here cast an extremely long shadow that we should all admire and respect. This is a bit of a dark time here, prompted by a delayed release of EL6 that was already delayed by Red Hat for their own (probably similar) reasons. SysAdmin frustration is at a high point as a result of these combined factors, causing many involved to question even the very best of decisions. I suspect that the many requests for ETAs are exacerbating the issue that the CentOS developers simply cannot predict a final release date, which is further exacerbated by the otherwise noteworthy, high-quality QA now in place, which is causing requests for build changes that delay the release and cause need for further QA checks on packages rebuild due to deps changes. It's a perfect storm of factors that, together, result in the current situation. I'm a developer; this type of situation is unfortunately common and can be frustrating for all involved, and just cannot be completely avoided! The choices are clear, however: 1) Stick w/CentOS, get a high quality, highly compatible release at little/no cost, with an uncertain release date. 2) Switch to SL, get a high quality, reduced compatibility release (due to slightly different goals and qualities) at little/no cost, right now; 3) Switch to RHEL, get a quality release at significant cost, right now. 4) Complain loudly about how it's not perfect and/or get angry at people who question your motives and/or competence after years of otherwise successful cooperation. I wish option #4 was not so commonly exercised here. It really might be a good time to consider moderation. Anybody want to volunteer as a moderator? -Benjamin Smith -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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Why is iptables configured to accept packets on ports 50 and 51?
by Aleksey Tsalolikhin 17 May '11

17 May '11

[root@hwdltsaloli ~]# cat /etc/sysconfig/iptables # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT [root@hwdltsaloli ~]# lsof -i:50 [root@hwdltsaloli ~]# lsof -i:51 [root@hwdltsaloli ~]# /etc/services says: re-mail-ck 50/tcp # Remote Mail Checking Protocol re-mail-ck 50/udp # Remote Mail Checking Protocol la-maint 51/tcp # la-maint 51/udp # IMP Logical Address Maintenance Google turns up RMCP is a simple lightweight DP protocol for checking if you have mail on a server A quick Google search failed to turn up what is "IMP Logical Address Maintenance" Why is this in the default iptables configuration? Thanks, Aleksey

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securing sshd with selinux
by Hajo Locke 17 May '11

17 May '11

Hello List, dont have experience with selinux, but i want to know if it would be a practicable way to secure sshd with selinux. i have some webservers and want to grant ssh-access to some users. my plan ist to make new server where users are able to log in. the homes from webserver are mounted in by nfs etc. i dont like chroot-env for ssh, a lot of disadvantages... also i dont like if users would scrabble folders that doesn't concern them. so i thought it would be possible to restrict users by selinux so they dont are able to see too much... objective is to restrict users to there home (as far as possible) and run some typical programms like perl, php, some binaries and hide all other... is this a useful scenario for selinux? If not, are there alternatives? Thanks, Hajo

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yum in test mode and downgrade of a package
by Bernard Fay 17 May '11

17 May '11

Is it possible to run yum in test mode? Something similar to rpm --test ... Also, is it possible to downgrade a package? Say we install a package and we find this new version creates problem for an application running on the server and we need to go back to a previous version. Thanks, -- Bernard

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xargs with max each line / argument
by neubyr 17 May '11

17 May '11

How do I pass xargs input one line at a time to subsequent command? For example I want to install rubygems by reading a text file as shown below, however the arguments are getting passed all at once to the 'gem install' command. I hace tried -L (max-lines) and -n (max args) options, but it didn't work. What's missing here?? Any help? $ cat gem.list.1 mkrf rake xmlparser $ awk '{ print $0 }' gem.list.1 | xargs -L 1 -0 -I name sudo gem install name ERROR: could not find gem mkrf rake xmlparser locally or in a repository thanks, neuby.r

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allowing users to write to a web content area
by David Mehler 17 May '11

17 May '11

Hello, I've got apache running on a centos 5.6 machine. All of my users have a umask of 077 set in /etc/bashrc. I'm now wanting to give several of them permission to write to a web area so they can place content visible to the web server. I've got two groups webdev1 and webdev2 which I want one to be able to write to site1 and the other to site2. I've got between 3 and 5 users in each group. I'd prefer not to mess with these users umask settings, but want the correct permissions and ownerships user:webdev1 or user:webdev2 where user is the username of the person who placed the file. Permissions I believe should be 664 so apache can read the files. I'm wondering if I need to look in to ACLS which I've not used or if there's another solution? Thanks. Dave.

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Perhaps an interesting development....
by Lamar Owen 17 May '11

17 May '11

Well, not to take away too much from the tinderbox, but I'd like to point everyone's attention to: http://www.networkworld.com/community/blog/microsofts-open-source-love-expa… Headline: "Microsoft's open source love-in expands with CentOS Linux support" Short version: Microsoft now supports CentOS officially in Hyper-V.

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