Discuss October 2009

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338 participants
325 discussions

Openfiler question - fiber channel?
by Alan McKay 20 Oct '09

20 Oct '09

Hey folks, I don't seem to be able to get a response from the openfiler forums (and they want 40 quid for the fine manual!), and since there has been a lot of chat about it here lately, I figured I'd ask here. Please forgive my terminology as I am just making my first baby steps into iSCSI and Fiber Channel, and am not very well read on the matters. So I could be using the wrong terms (anyone got a good primer to recommend?) It seems straightforward that I can install openfiler to server iSCSI disks out over the network. And it seems obvious to me that I'd want a dedicated network for doing that. That part is easy. But based on some poking around on the openfiler site and in the forums, it looks to me like it might be possible to stick a fiber channel card into an openfiler system, and serve fiberchannel out to other systems? Is that right? Is anyone here doing this? This does tie back in to CentOS directly because most of my systems are CentOS, and I'd eventually like to migrate them in this direction, depending on what comes of my benchmarking thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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centos5.4 and freenx - using my home dir and settings
by Ryan Pugatch 20 Oct '09

20 Oct '09

Hello all, I am setting up freenx on a machine and I am able to connect to it remotely. However, when I connect and start xfce it does not appear to use the correct settings. It acts like it is a whole different user. It is starting the desktop environment as the nx user rather than myself. Is there any way to have the NX server connect as myself rather than having a whole separate virtual environment? I know you can't connect to an existing X session that wasn't started with FreeNX, but I want to be able to start a session using my settings and have access to my home dir, etc. Thanks, Ryan

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VMware Server 2.0.1 and Centos 5.4
by Ben Mohilef 20 Oct '09

20 Oct '09

Upgrade to RHEL 5.4's glibc has rendered vmware-hostd inoperable in some systems. I don't know if Centos 5.4 has the same conflict between glibc and VMware Server as RHEL (no reason it shouldn't). If you run VMware Server 2.0.1 make a copy of /lib64/libc-2.5.so (or /lib/libc- 2.5.so) before upgrading to 5.4. If you encounter this problem follow dirkgf 's instructions in http://communities.vmware.com/thread/229957 from which I quote: > > Re: vmware-hostd crashes repeatedly after upgrade to RHEL 5.4 Sep 5, > 2009 7:49 AM > > just for reference in case somebody else is having this issue. We seem to have > been able to resolve the problem for us. Following the steps we performed. > > * Log on to your VMware host. > * Create the directory /usr/lib/vmware/lib/libc.so.6 > * Log on to an RHEL 5.3. machine. Grab /lib64/libc-2.5.so (or > /lib/libc-2.5.so in case you're running an 32 Bit host) and copy it to the > VMware host into /usr/lib/vmware/lib/libc.so.6 > * Rename the file libc-2.5.so within /usr/lib/vmware/lib/libc.so.6 to > libc.so.6 * Open /usr/sbin/vmware-hostd and add > /usr/lib/vmware/lib/libc.so.6 to the LD_LIBRARY_PATH. I just added an > "export LD_LIBRARY_PATH=/usr/lib/vmware/lib/libc.so.6:$LD_LIBRARY_PATH" > before the last line. * Restart your vmware services (or just the host) > > > Downgrading libc might be also an option, but I'd like to keep the host > unchanged other Works for me on a x86_64 system which exhibited similar symptoms. I agree with his last line because I don't know what else retaining the old glibc wold break. regards, benm

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Monitoring a remote server with Conky ?
by Niki Kovacs 20 Oct '09

20 Oct '09

Hi, I've been using Conky for some time, a nifty utility to monitor just about anything on the PC. Vital things like CPU, RAM, swap, disks, current song playing in MPD :o) Here's what it looks like : http://www.microlinux.fr/images/bureau_conky.png And with more detail : http://www.microlinux.fr/images/conky_zoom.png Now I wonder... I'd really like to use that to monitor my remote server. I know this feature isn't officially supported by Conky, but I'm right now thinking about a workaround. Something like: OK, my server is 'headless' (e. g.: no graphical server, nothing), but why not install just xorg-x11-server-Xorg, then use Conky and forward it to my local display with SSH -X ? I'm pondering this question, thinking about the possible issues... ... so maybe one of you guys here has come up with some solution ? Cheers, Niki

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Don't have scaling_available_frequencies files
by Neil Aggarwal 20 Oct '09

20 Oct '09

Hello all: I am trying to follow the RHEL virtualization guide. According to Chapter 17, I have a processor without a constant Time Stamp Counter (Its an Opteron). According to that guide, I need to set the MIN_SPEED and MAX_SPEED variables in /etc/sysconfig/cpuspeed to the highest frequency show in /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies I took a look at my system (CentOS 5.4) and there are no cpufreq directories in the cpu folders. Is that a problem? 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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update of openssh-server i386 4.3p2-36.el5, dependencies
by zagiatakrapovic＠gmx.ch 20 Oct '09

20 Oct '09

more rant on @ChrisG: maybe you should check your ironyEnabled flag is set to TRUE and the personalSensitivity enum is not WALLFLOWER but SELFCONFIDENT thx for your advises and lessons, the best lesson for me now was to see that trying to refresh a stalled thread by using kind of humor isn't accepted in this part of the world. next time I will just try "PING", that's less human like but maybe less people get offended... more rant off -- Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3.5 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/chbrowser

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sum and limit quota for multiple filesystems/mountpoints
by Götz Reinicke - IT-Koordinator 20 Oct '09

20 Oct '09

Hi, is there any way to sum and limit quotas for one user across multiple filesystems? E.g. I'd like to use different mountpoints on a mailserver for /var/mail and /home but the user should have only a total of 1GB. or on a samba server the windows profile files should be on an other filesystem as other files for that user. Regards, Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzende des Aufsichtsrats: Prof. Dr. Claudia Hübner Staatsrätin für Demographischen Wandel und für Senioren im Staatsministerium Geschäftsführer: Prof. Thomas Schadt

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RAID advice? and KVM advice?
by Dave Stevens 20 Oct '09

20 Oct '09

Hello All, In the not too distant future I will be commissioning a new CentOS (5.4?) box with 4 identical SATA drives. I'd like to set them up as RAID 1+0 for speed and redundancy. I've read the RHEL 5 deployment guide on raid setup and it seems to cover the basics of software raid pretty well, but doesn't cover 1+0. Does anyone have a reference for that kind of configuration? I'd also like to have two virtual domains, one for CentOS and one for Debian. any suggestions for setup docs for that kind of arrangement? TIA. Dave -- When addiction becomes commonplace in a society, people become addicted not only to alcohol and drugs, but to a thousand other destructive pursuits: money, power, dysfunctional relationships, or video games. A social perspective on addiction does not deny individual differences in vulnerability to addiction, but it removes them from the foreground of attention, because social determinants are more powerful.

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Re: [CentOS] iptables - Forwarding with port translation thru an OpenVPN tunnel
by Chuck Munro 19 Oct '09

19 Oct '09

Thanks to those who responded. The use of Apache's reverse proxy was something I would never have though of (it's the mind-numbing cold medication I'm on, LOL) However, I did manage to get things rolling thru the tunnel by configuring strong-end routing at the remote server. Requests were indeed arriving at the remote, but because the request's origin IP address was that of the outside user's browser, the remote server was simply trying to return responses via its default route, which is not the tunnel. I *have* to ask ... why is strong-end routing not the default behavior in Linux? Anyway ... Adding 'ip route ....' and 'ip rule ....' commands when establishing the tunnel did the trick. On the remote server, here are the commands run in a script launched by rc.local: --------------------------- #!/bin/sh # NOTE: To allow VPNs under OpenVPN, IPv4 Forwarding # must be enabled in the /etc/sysctl.conf file! # Enable NAT for the OpenVPN tunnel from the main server: WAN=eth0 # The primary public IP interface iptables -t nat -A POSTROUTING -s 172.17.xxx.0/24 -o ${WAN} -j MASQUERADE # Enable strong-end routing for traffic coming in thru the VPN tunnel: ## Table 200 - In/Out traffic via tun0: ip route add table 200 172.17.xxx.0/24 via 172.17.xxx.yy dev tun0 ip route add table 200 default via 172.17.xxx.yy dev tun0 ## Engage! ... ip rule add from 172.17.xxx.0/24 lookup 200 service openvpn start --------------------------- In the example above, xxx.yy is tun0's 'P-t-P' IP address (usually it's inet IP address minus 1). -- and -- On the main server, here are the commands run in a script launched by rc.local: --------------------------- #!/bin/sh # NOTE: To allow VPNs under OpenVPN, IPv4 Forwarding # must be enabled in the /etc/sysctl.conf file! # Enable NAT for the OpenVPN tunnels: WAN=eth0 # the public IP interface /sbin/iptables -t nat -A POSTROUTING -s 172.17.xxx.0/24 -o ${WAN} -j MASQUERADE TunnelRemoteIP="172.17.xxx.zz" # The inet IP address of the remote server thru the VPN. # Force any HTTP/HTTPS requests on eth0:1's secondary IP address (64.aaa.bbb.ccc) # to be forwarded to the remote server, with port translation. # HTTP: /sbin/iptables -t nat -A PREROUTING -i eth0 -d 64.aaa.bbb.ccc -p tcp --dport 80 -j DNAT --to ${TunnelRemoteIP}:29080 /sbin/iptables -A FORWARD -p tcp -m tcp -i eth0 -o tun0 -d ${TunnelRemoteIP} --dport 29080 -j ACCEPT # # HTTPS: /sbin/iptables -A PREROUTING -t nat -i eth0 -d 64.aaa.bbb.ccc -p tcp --dport 443 -j DNAT --to ${TunnelRemoteIP}:29443 /sbin/iptables -A FORWARD -p tcp -m tcp -i eth0 -o tun0 -d ${TunnelRemoteIP} --dport 29443 -j ACCEPT service openvpn start sleep 2 # Be polite. /sbin/iptables -A FORWARD -p tcp -m tcp --dport 80 -j ACCEPT /sbin/iptables -A FORWARD -p tcp -m tcp --dport 443 -j ACCEPT --------------------------- Obviously the above iptables entries could simply be added to the recipe in /etc/sysconfig/iptables, but I chose to put them in this script so that if I don't want tunnels to be started I don't run the scripts. There may be redundant commands in all of this, but at least it works flawlessly for me. I didn't use any SNAT statements on the rash assumption POSTROUTING does the same thing. I hope this may be useful to anyone else out there who encounters this issue. Cheers, Chuck

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Re: [CentOS] [CENTOS] allowing users to issue the "shutdown" command
by Buz Davis 19 Oct '09

19 Oct '09

Thanks to all who answered. "Poweroff" is exactly what I needed.

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Discuss October 2009