Discuss April 2010

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265 participants
237 discussions

PAPI + perfctr on CentOS 5?
by Eduardo Grosclaude 28 Apr '10

28 Apr '10

Has anyone succesfully compiled a PAPI+perfctr-enabled kernel? I've been mixing and matching instructions from the PAPI distribution and those from CentOS wiki to no avail. TIA -- Eduardo Grosclaude Universidad Nacional del Comahue Neuquen, Argentina

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Re: [CentOS] [GLUG-tech] Re: how to reroute all ADSL traffic via another server on the internet?
by Rudi Ahlers 28 Apr '10

28 Apr '10

On Wed, Apr 28, 2010 at 4:19 PM, zerlgi <zerlgi(a)gmail.com> wrote: > Probably the easiest VPN to set up, but not terribly secure, is VTun. > > If you use (horrors) PPTP, then windows already has a client for it. > .. openVPN also has a nice Windows client that can be run as a service > at startup or called on demand. > .. openVPN supports multiple tunnels (one per .cfg file) > and can allow/disallow client-to-client traffic (something you'd > probably want to do) > ... so that if you have several companies connecting as clients to > your server (traffic redirector) > then they wouldn't be able to travel back down the VPN to a different client. > > ... in terms of implementation. e-box has one of the easiest OpenVPN setups. > it provides a self-extracting installer file to windows clients that > includes the configs and the client application. > Linux folk should be able to figure out where stuff goes. > (/etc/openvpn /usr/local/etc/openvpn) > Unfortunately I can't download & install OpenVPN on that box, so this won't be an option. Thanx for all the suggestions though. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Delivery failed
by jcasale＠activenetwerx.com 28 Apr '10

28 Apr '10

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Total Threads used in a system
by Jatin Davey 28 Apr '10

28 Apr '10

Hi I know we can get the total number of processes running in the system using the 'ps -A' command but is it possible to get the total number of threads running in the system ? Is this information exposed using any of the MIB's ? Thanks Jatin

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Kernel Or Hardwar e
by cahit Eyigünlü 28 Apr '10

28 Apr '10

i have seen many times the given error, there was no log about error. Beside this my machine never uses swap i realize that when i have last 500 Mb ram it get this error and after using 5Gb of 8 Gb it decreasing like plane crash :) I've found this form and it is the same with my error : http://www.webhostingtalk.com/showthread.php?t=913156 There could be a hardware problem i am not sure , i see this error at least one time in a day. Do you have an advice ? unluckeyly i have found only one people who has the same error with me :) and his machine is also same with mine :D

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mapping drives
by Jeff Sadino 28 Apr '10

28 Apr '10

I am having trouble mounting drives. We have a Windows 2008 (10.1.1.17, MRISRV02) server with folders I what access to. On my Fedora 8 client, in my fstab file, I have: //10.1.1.17/USERS/Jeff /home/mriuser/Desktop/jeff cifs rw,username=cluster,password=mrilab 0 0 and this works just fine. My samba is up to date: [mriuser@localhost ~]$ rpm -qa | grep "samba" samba-common-3.0.33-0.fc8 samba-3.0.33-0.fc8 system-config-samba-1.2.58-1.fc8 samba-client-3.0.33-0.fc8 However, we also have a CentOS 4 64bit "pseudo-server" machine. When I try to map the folders on this CentOS machine using an fstab entry like this: //10.1.1.17/USERS/Jeff /mnt/Jeff cifs rw,username=cluster,password=mrilab 0 0 It maps the USERS folder to /mnt/Jeff. I can cd into Users and then cd into Jeff, but I want to be able to go straight into Jeff and not have access to the rest of the user folders. I just upgraded my samba from 3.0.25 to 3.0.33 and have not restarted. [root@cluster mnt]# rpm -qa | grep "samba" samba-client-3.0.33-0.18.el4_8.1 samba-common-3.0.33-0.18.el4_8.1 samba-common-3.0.33-0.18.el4_8.1 Can anyone please help me out? Thank you!! Jeff

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System Resources Graphing
by Matt 28 Apr '10

28 Apr '10

Is there a package I can get that will graph system resources such as CPU and disk I/O to an html file or something? Matt

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iSCSI / GFS shared web server file system
by jchase 28 Apr '10

28 Apr '10

We currently have a MD3000i with an iSCSI LUN shared out to our apache web server. We are going to add another apache web server into the mix using LVS to load balance, however, I am curious how well iSCSI handles file locking and data integrity. I have the iSCSI partition formatted as ext3. Is my setup totally flawed and will ext3 not allow for data integrity with multiple apache hosts reading/writing to the shared storage? Am I required to also setup GFS across my apache hosts or does iSCSI somehow manage this? Thanks for helping clear this up, James

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Transparent proxy with LVS
by Enrique Verdes 27 Apr '10

27 Apr '10

I've managed to configure a LVS Cluster to act as a transparent proxy squid farm, with a virtual server as load balancer, and three real servers. Because redirecting packets going to port 80 to port 3128 of squid in the load balancer doesn't works, the solution has a mix of ip route and iptables. Here is the script I wrote to configure transparent proxy. #!/bin/bash #Transparent proxy configuration #Variables VIP=192.168.18.10 WEB=80 SRV01=192.168.18.40 SRV02=192.168.18.41 SRV03=192.168.18.42 #Packet marking iptables -t mangle -F iptables -t mangle -A PREROUTING -p tcp --dport $WEB --dst ! $VIP -j MARK --set-mark 2 #Routing table creation if [ $(grep -sq 'www\.out' /etc/iproute2/rt_tables) ]; then echo "Table exists" else echo "202 www.out" >> /etc/iproute2/rt_tables fi #Clean tables and rules ip rule del prio 100 fwmark 2 table www.out ip route flush table www.out #Routing of marked packets ip rule add prio 100 fwmark 2 table www.out ip route add table www.out to local 0/0 dev lo ip route flush cache #ipvsadm rules ipvsadm -A --fwmark-service 2 ipvsadm -a --fwmark-service 2 --real-server $SRV01 --gatewaying ipvsadm -a --fwmark-service 2 --real-server $SRV02 --gatewaying ipvsadm -a --fwmark-service 2 --real-server $SRV03 --gatewaying As you can see, I mark all packets not directed to the virtual server itself, to port 80 with 2, and then route all those marked packets to the loopback interface. With ipvsadm I forward the marked packets to the real servers. In the real servers there's a rule in the prerouting chain to redirect those packets to port 3128 I'm using pulse service to start lvs, and would like to add the ipvsadm rules to the /etc/sysconfig/ha/lvs.cf, so they are issued by pulse at startup. I can't figure out how to do it. When I try to start pulse, it fails because i left the address field empty. But this service is not tied to any address, I just want the fwmark match to forward the packets to the real servers. I also have dns in this lvs cluster. Any suggestion about how I can add my ipvsad rules to the lvs.cf file? -- Enrique Verdes <EVerdes(a)conatel.com.uy> Depto. de Ingeniería - CONATEL S.A. Este mensaje es privado y confidencial y tiene como único destinatario la persona a la que va dirigida. La responsabilidad de su contenido es del remitente y no de CONATEL. Si usted ha recibido este mensaje por error, tenga presente que le está prohibido revelarlo, copiarlo o distribuirlo, debiendo avisar de inmediato al remitente y borrarlo de su sistema. El error de transmisión no implica renuncia a la privacidad y confidencialidad. This email is private and confidential and intended solely for the use of the individual to whom it is addressed. The responsibility of its content is the sender's and not CONATEL'S. If you have received this email by mistake please notify the sender immediately and delete it from your system. Its disclosure, copy or distribution is absolutely forbidden. The transmission error does not imply a waiver of privacy and confidentiality.

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[off-topic] RHEL6 and NIS/YP
by Marcelo M. Garcia 27 Apr '10

27 Apr '10

Hi Did anyone managed to configure RHEL 6 beta to authenticate using NIS? During the installation the option to use NIS as authentication method is disable. When I tried to install with yum, I got the following message: Installed size: 222 k Is this ok [y/N]: y Downloading Packages: ftp://ftp.redhat.com/pub/redhat/rhel/beta/6/i386/os/Packages/yp-tools-2.9-8…: [Errno 14] PYCURL ERROR 6 - "" Trying other mirror. ftp://ftp.redhat.com/pub/redhat/rhel/beta/6/i386/os/Packages/ypbind-1.20.4-…: [Errno 14] PYCURL ERROR 6 - "" Trying other mirror. Error Downloading Packages: 3:ypbind-1.20.4-21.el6.i686: failure: Packages/ypbind-1.20.4-21.el6.i686.rpm from rhel-beta: [Errno 256] No more mirrors to try. yp-tools-2.9-8.1.el6.i686: failure: Packages/yp-tools-2.9-8.1.el6.i686.rpm from rhel-beta: [Errno 256] No more mirrors to try. Thanks Marcelo

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Discuss April 2010