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34758 discussions

allowing users to issue the "shutdown" command
by Buz Davis 19 Oct '09

19 Oct '09

I am running CentOS 5.3 and have just the two accounts "root" and "buz". I would like to be able to issue "shutdown" from the account "buz", and thus created /etc/shutdown.allow with the single entry "buz" (without any quotes). I still get the error message "only root can do this" (or something similar) even if I include the '-a' option on the shutdown command. What am I missing ?

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Confusion about scheduling tasks with crontab
by Niki Kovacs 19 Oct '09

19 Oct '09

Hi, I have to setup a scheduled task on a server, and I just read through some crontab docs. Now I'm confused. It's not so much the syntax of the cron job to define (I got that), it's more... how do I get to define it? Use a text editor (vi or the likes) to edit /etc/crontab directly? Or create some empty file in /etc/cron.daily or /etc/cron.hourly or the likes and then edit it using crontab -e ? Anyway, here's what I'd like to do. I have a script: /root/scripts/backup.sh I want to run that script every day at 07:00 in the morning. Once. Now how would I go about that? The thing is: I'd like to know an orthodox way to go about this. You can be laconic in your answers, I'll retrive the details in the docs. Cheers, Niki

7 9

iptables - Forwarding with port translation thru an OpenVPN tunnel
by Chuck Munro 19 Oct '09

19 Oct '09

Perhaps someone with a sharper brain than I can solve this little mystery. I've Googled until I'm blue in the face, read all TFM's I can find, and tried several iptables rule combinations but just can't get the following to work. Here's my challenge: I have a CentOS-5.3 "main" server with a static public IP address running Apache, OpenVPN, and a bunch of other services. The primary IP address for the only NIC in this box is used by Apache on standard ports 80 and 443. I have a secondary static public IP address assigned to this same NIC as eth0:1 I have a working OpenVPN tunnel going to another CentOS-5.3 server which has Apache listening on its eth0 NIC for requests on non-standard ports 29080 and 29443(don't ask!). This server is accessible on its static public IP address and thru OpenVPN tunnel from the main server. The main server is the OpenVPN server as well, with private IP address 172.16.xxx.1/32 auto-assigned to it. The second server is a VPN client with IP address 172.16.xxx.yyy/32 assigned. The narrow netmasks are the OpenVPN default, presumably used for isolation among multiple clients. OpenVPN is configured to run over the main server's NIC via its eth0:1 secondary IP address 64.aaa.bbb.ccc The main server has a static route set up between its eth0:1 IP and the remote server's public IP address (not the tunnel IP). This route is only there so that during initial VPN negotiations the data will move via eth0:1's IP address. Things like ping, SSH, scp and HTTP/HTTPS all work correctly thru the VPN in both directions, so the VPN itself is solid. Ok, so now I want external HTTP/HTTPS requests made to the main server's eth0:1 public IP address to be forwarded thru the VPN to the second remote server, with port translation along the way. Here is what I want to happen: Outside world HTTP/HTTPS requests to eth0:1 ports 80/443 | V CentOS eth0:1 (64.aaa.bbb.ccc) | V Translate to ports 29080/29443 | V Forward requests thru the tunnel to 172.16.xxx.yyy | V Remote Apache responds, packets return thru VPN to "main" | V Response goes back to the outside world via 64.aaa.bbb.ccc HTTP/HTTPS requests to the 64.aaa.bbb.ccc public IP just hang and time out. Direct requests to the remote server on the non-standard ports work fine. I've tried lots of iptables example entries found on several forums but so far none of them seem to work. Does anyone have a cookbook-like complete set of iptables rules that will accomplish what I need? Is it possible I need to set up strong-end routing on the remote server to send the response packets back thru the VPN? (such a pain to configure) Any assistance will be most gratefully received! Best Regards, and my sincere kudos to the CentOS team and helpful list members over the past few years. Chuck

3 2

For the CentOS team : The openais Nightmare. And some questions.
by F M 18 Oct '09

18 Oct '09

Hello guys, I have some questions about how the CentOS choose and rebuild RH RPMS. First here is my w-e nightmare : I have a 4 nodes Xen cluster using GFS2 (on SAN) and the Cluster Suite. Everything is from the CentOS repo. I am not updating these computers very often. I am always waiting several weeks to install updates just to be sure that everything is fine for others. This w-e I installed the lastest updates on these machines. Some were cluster related : cman, rgmanager and gfs2_tools. These updates are in the CentOS updates repo for 1 month now. After the reboot the cluster died. After hours of troubleshooting I found this thread on the Linux cluster mailing list : http://bit.ly/3HxVLu It said that CentOS is missing the openais update and without it the cluster is broken. The solution is to downgrade the RPMS installed. This fix the probe for now. Why the other RPM did not complain during the installation ? No idea. But what is interesting is that the threat 1 month old. And today the openais RPM is still missing from CentOS repo. It means that at the moment you cannot install a cluster using CentOS. Now my questions : Why after 1 month the update is still missing ? Without it : no cluster at all. As I am writing this email you cannot built a Cluster using CentOS. Is the RPMS for openais was hidden by RH ? No We can find it on the RH FTP. And after looking in other threat I found that Mr K Singh built it on 16-Sep-2009. So why can't I find it on the update. Once again I'd like to remind you that without it you cannot build a CentOS Cluster. I do not blame CentOS team. They are making a great job. Without them my company would not have a cluster. We cannot afford to pay 20k $ each year to RH for that. The team is making an amazing job and I do not care if I wait 1 or 2 months more for 5.4. And I really really respect Mr Singh. This email is not directed to him at all it is just that he is the one that kindly built the openais update and share it on his centOS page. But the question remains : why is this update is not on the repo ? And are they others ? Tx for answering me and have a good week-end. it is Sunday 6PM and mine finally starts ;-)

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installing working skype possible???
by ken 18 Oct '09

18 Oct '09

I easily installed and used skype on my previous linux distro on this same machine, but am having problems getting it to work on my relatively new centos 5.3. I downloaded three versions of skype from their website: the two fedora rpms wouldn't install, their error messages complaining that it needed another package, a package which was already installed. (I figured it had to be looking for that package in the wrong place... something I couldn't do anything about.) So I downloaded the suse 10+ rpm and it installed just fine. But when I ran it (/usr/bin/skype), it errored out also, saying "/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.9' not found (required by /usr/bin/skype)". So I used yum to search for any glibc which remotely corresponded to that glibc and got nothing. So is anybody running skype on 5.3? If so, how did you install it and get it to work? Thanks for the good tips. -- War is a failure of the imagination. --William Blake

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Passenger Best Practice
by Stephen Nelson-Smith 18 Oct '09

18 Oct '09

I want to move from running puppet under it's own web brick server, to using passenger. I'd like to get an idea of how folk are running passenger? Ideally I'd like to keep everything rpm based, so would need ruby enterprise rpms, and then the mod_rails / passenger plugin? How are you folk doing it? I've seen: http://download.elff.bravenet.com/5/x86_64/repoview/mod_passenger.html And I've also seen: https://packages.endpoint.com/ Which seems to do some enterprise ruby. What else is out there? I'm more than happy to do it all myself, but if so it ought to be done in the way which best serves the project... So... what thoughts / recommendations? S. -- Stephen Nelson-Smith, Technical Director, Atalanta Systems Ltd

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Is AMD rev F the same thing as socket F?
by Neil Aggarwal 18 Oct '09

18 Oct '09

Hello: I am looking at the RHEL 5.4 virtualization guide. According to Chapter 17, if I want to use KVM on my machine, I need to check if it has the constant Time Stamp Counter by running this: cat /proc/cpuinfo | grep constant_tsc When I do that on the server (Currently running CentOS 5.3), I do not get any output. According to the output, that means my system does not have the counter. It then gives me instructions for AMD revision F CPUs. I did a search and did not find anything that seems relevant to revision F. The only stuff I am finding is talking about socket F. Is that the same things as a Socket F CPU or something different? Thanks, Neil -- Neil Aggarwal, (281)846-8957, www.JAMMConsulting.com Will your e-commerce site go offline if you have a DB server failure, fiber cut, flood, fire, or other disaster? If so, ask about our geographically redundant database system.

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Totem needs plug-ins
by ken 18 Oct '09

18 Oct '09

Just tried to play a movie/DVD and Totem (what automatically popped up when I inserted the DVD) said it needed plug-ins... it didn't say which plug-ins. The website listed in the help page no longer exists. I have four of the gstreamer packages and libdvdcss installed, but I guess there's something more needed. Anyone know? tia for the tips. -- War is a failure of the imagination. --William Blake

3 2

CentOS 5.4 and BitTorrent
by Yves Bellefeuille 18 Oct '09

18 Oct '09

If I remember correctly, when version 5.3 was released, about 95% was made available by BitTorrent before the official release date, so that the entire file would be available as soon as possible after the release. Could the same be done this time? -- Yves Bellefeuille <yan(a)storm.ca> "Yves Bellefeuille: Eterna malvenkanto en UEA" -- Heroldo Komunikas, n-ro 389

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Samba/BackupPC under CentOS-5.3
by Timothy Murphy 17 Oct '09

17 Oct '09

I'm almost completely ignorant about samba on Windows machines, In particular I know nothing about Windows permissions, if that is relevant here. I am running BackupPC on a CentOS-5.3 machine. It works perfectly for backing up Linux folders, but I have great difficulty extending it to Windows clients. To be precise, I have a share called "EA Games D" on a machine running Windows XP Pro. I can access it through Samba: ------------------------------------- m@rose ~]$ sudo mount -t cifs harriet:"EA Games D" /mnt/win Password: [tim@rose ~]$ ls /mnt/win The Sims 2 ------------------------------------- But I do not seem able to back it up with BackupPC . In my BackupPC conf file for harriet I have under Smb Settings "EA Games D" But when I run a backup (incremental or full) I get the error in /var/log/BackupPC/LOG 2009-10-17 14:43:43 Got fatal error during xfer (tree connect failed: NT_STATUS_BAD_NETWORK_NAME) 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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