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RE: [CentOS] Hidden networking device configuration
by Bowie Bailey 27 Jan '06

27 Jan '06

Barry Brimer wrote: > > Rodrigo Barbosa wrote: > > > On Thu, Jan 26, 2006 at 04:15:59PM -0500, Bowie Bailey wrote: > > > > I am trying to configure load balancing for a couple of CentOS4 > > > > servers. > > Have a look at the Piranha/LVS direct routing information here: > <http://www.redhat.com/magazine/014dec05/departments/tips_tricks/> > > You will have to scroll down the page to find it. Interesting. I'm not too familiar with iptables, but based on that tip and what I've read from the man page, I should be able to do this for a webserver: iptables -t nat -A PREROUTING -p tcp -d 192.168.1.20 \ --dport 80 -j REDIRECT This should allow my machine to accept packets destined for the virtual IP (on port 80) and redirect them to localhost. Did I mess anything up there? Just a couple of questions come up here: 1) Do I still need to enable ip_forward? 2) When the server replies to the client, will the reply be sent from the proper virtual IP address? -- Bowie

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RE: [CentOS] Hidden networking device configuration
by Bowie Bailey 27 Jan '06

27 Jan '06

Rodrigo Barbosa wrote: > On Thu, Jan 26, 2006 at 04:15:59PM -0500, Bowie Bailey wrote: > > I am trying to configure load balancing for a couple of CentOS4 > > servers. In order to make it work, I need to add a hidden > > networking device on > > each server with the virtual IP. I found the following > > instructions on linuxvirtualserver.org for doing this, but they > > don't work. > > > > echo 1 > /proc/sys/net/ipv4/ip_forward > > ifconfig dummy0 0.0.0.0 up > > echo 1 > /proc/sys/net/ipv4/conf/all/hidden > > echo 1 > /proc/sys/net/ipv4/conf/dummy0/hidden > > ifconfig dummy0:0 172.26.20.110 up > > > > When I try to write to /proc/sys/net/ipv4/conf/all/hidden, the > > system refuses to let me create the file. I'm logged in as root, > > so why am I having permission problems? > > > > Also, I believe these instructions are for 2.2 or 2.4 kernels. > > Have things changed with 2.6? > > No, things are exactly the same. Meaning that LVS is a separated patch > that is not included either on the stock kernel or the RHEL one. > > If you really want to use LVS, you will have to apply the patch. Hmm... I saw a reference to a kernel patch, but I thought the patch was for the server. I am actually not using a Linux LVS server, I am using a Foundry ServerIron to do the load balancing. It works great for standard balancing, but now I need to do direct routing to balance two CentOS4 servers. The instructions that came with the ServerIron just gave a single ifconfig command to set it up (which royally screwed up the networking). Do I need to install the kernel patch on these machines? And why would that affect the permissions problem I was seeing? As root, I should be able to create a file in any directory. It may not do what I expect if the functionality is not in the kernel, but I should be able to create the file. -- Bowie

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Migrate from WBEL3 to CentOS3
by Tom Brown 27 Jan '06

27 Jan '06

Hi I have followed the steps in the howto on the site to move a box from WBEL3 to CentOS3 (i have done this on another box before without issue) however i'm getting this error on a yum update Resolving dependencies .conflict between gtk2 and librsvg2 the update then exits - anyone know about this one? thanks

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firewall and opening ports
by jim＠datamantic.com 27 Jan '06

27 Jan '06

Hi list. This is my first post here. Super newbie. I will try not to ask too many questions, but searching is hard when you don't even know where to begin. Hopefully someone can point me in the right direction. I have just installed CentOS 4.2. I selected to have a firewall in the graphic installer, and I opened ports 22 and 80. Fine so far. SSH and HTTP both work. But now that everything is set up I have discovered I need to open port 53 in order to install djbdns. My main question is: what did I install by choosing to have a firewall in the CentOS installer? Is this iptables? Or is it something else? And then if anyone just wants to give me the complete answer: how do I open port 53? Thanks!

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Yum Python Errors
by Mark Sargent 26 Jan '06

26 Jan '06

Hi All, what is the meaning of below from yum, Traceback (most recent call last): File "/usr/bin/yum", line 7, in ? yummain.main(sys.argv[1:]) File "/usr/share/yum-cli/yummain.py", line 68, in main result, resultmsgs = base.doCommands() File "/usr/share/yum-cli/cli.py", line 408, in doCommands return self.updatePkgs() File "/usr/share/yum-cli/cli.py", line 923, in updatePkgs self.doRepoSetup() File "/usr/share/yum-cli/cli.py", line 84, in doRepoSetup self.doSackSetup() File "__init__.py", line 143, in doSackSetup File "repos.py", line 211, in populateSack File "mdcache.py", line 103, in getPrimary File "mdcache.py", line 90, in _getGeneric File "mdcache.py", line 62, in _unpickle EOFError This occurred after 1st attempt to do a yum update yum, for a laptop install that I've just allowed onto the net. Same after rebooting. Cheers. CentOS version: 4.1 yum version: 2.2.0 yum.conf: [dag] name=Dag RPM Repository for Red Hat Enterprise Linux baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag gpgcheck=1 enabled=1 Mark Sargent.

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hosts fail to negotiate 1000Mbps speed
by Akop Pogosian 26 Jan '06

26 Jan '06

I am trying to connect two workstations (CentOS 3&4) directly using a straight through cat 5e cable with a crossover adapter on one of the ends. Both hosts have gigabit-capable ethernet card. According to lspci host 1 has: 03:0e.0 Ethernet controller: Intel Corporation 82545EM Gigabit Ethernet Controller (Copper) (rev 01) and host 2 has: 05:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8050 Gigabit Ethernet Controller (rev 17) In order to get this controller work on host 2, I had to download and install a more recent version of the sk98lin driver. Host 2 runs CentOS 4. Host 1 runs CentOS 3 (with a stock e1000 driver). After I setup networking, ethtool reported for both hosts that the link runs at 100Mbps even though it says in both cases that the capability for 1000baseT/Half 1000baseT/Full modes and exists and is being advertised. If I force 1000Mbps speed with "ethtool -s eth1 speed 1000", I get: # ethtool eth1 Settings for eth1: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 1000baseT/Half 1000baseT/Full Advertised auto-negotiation: No Speed: Unknown! (65535) Duplex: Unknown! (255) Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: g and the eth1 link stops working. What could be a problem here? I tried loading both drivers with the parameter for 1000Mbps speed parameters but that didn't help. ( I used on host 1, alias eth1 e1000 Speed=1000 host 2, alias eth1 sk98lin Speed_A=1000 Speed_B=1000) -akop

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how to gui on centos ?
by spart cus 26 Jan '06

26 Jan '06

hi guys, what command will i type in to put me on the gui part of centos? this is my first time to use it. i've been using fedora before and the command was startx. what is the equivalent for centos? --------------------------------- Do you Yahoo!? With a free 1 GB, there's more in store with Yahoo! Mail.

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SCSI cards
by Denis Croombs 26 Jan '06

26 Jan '06

Hi I am trying to find a good PCI 64 SSI 320 raid controller to use with Centos & 4 10k drives as raid 1 & 0 to get the best I/O speed, any clues as to what people have found to be the best. Thanks Denis

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Hidden networking device configuration
by Bowie Bailey 26 Jan '06

26 Jan '06

I am trying to configure load balancing for a couple of CentOS4 servers. In order to make it work, I need to add a hidden networking device on each server with the virtual IP. I found the following instructions on linuxvirtualserver.org for doing this, but they don't work. echo 1 > /proc/sys/net/ipv4/ip_forward ifconfig dummy0 0.0.0.0 up echo 1 > /proc/sys/net/ipv4/conf/all/hidden echo 1 > /proc/sys/net/ipv4/conf/dummy0/hidden ifconfig dummy0:0 172.26.20.110 up When I try to write to /proc/sys/net/ipv4/conf/all/hidden, the system refuses to let me create the file. I'm logged in as root, so why am I having permission problems? Also, I believe these instructions are for 2.2 or 2.4 kernels. Have things changed with 2.6? -- Bowie

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SubVersion on CentOS 4.2
by James B. Byrne 26 Jan '06

26 Jan '06

I am new to linux based version control systems and am setting up a new project in Rails which will use SubVersion. I set up a repository for this project in a directory called /var/spool/svn and ran svnadmin create etc. I did all this while su'ed to root, however all programming will be done by non-privileged users. To provide for this I created a group called "svn", added the np userids to that secondary group and chgrp'ed the svn repository to have the guid set to "svn". However, attempts to use svn by np userids failed with references to ra_local and BDB access violations. What I discovered is that the default file modes established by svnadmin create do not give w access to the guid, only to the uuid. I therefore issued a chmod -R g+w * in the /var/spool/svn directory and svn thereafter worked as desired for privileged and non-privileged userids alike. My questions are three (four): 1. Is this behaviour (limiting access to a central svn depository to a single userid) intentional? (If so then why?) 2. Have I created future problems by loosening svn access to such an extent? 3. Is there a better way to accomplish this? Regards, Jim -- *** e-mail is not a secure channel *** mailto:byrnejb.<token>@harte-lyne.ca James B. Byrne Harte & Lyne Limited vox: +1 905 561 1241 9 Brockley Drive fax: +1 905 561 0757 Hamilton, Ontario <token> = hal Canada L8E 3C3

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