Discuss December 2009

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295 participants
271 discussions

partitioning order and IO performance
by Carlos Santana 24 Dec '09

24 Dec '09

Hi, Does mount point specification while partitioning (order in which I specify /, /boot, swap etc..) affect performance? I am not sure about the syntax, but I guess one can also specify address/block range while partitioning. Does it affect IO performance? Probably a stupid question, but just curious.. Any insights? Thanks, CS.

7 11

OT:Which filesystem to use with large files
by carlopmart 24 Dec '09

24 Dec '09

Hi all, Recently I have installed a centOS 5.4 server to use as a home NAS server. I need to use large files (8GB minimum) inside of it to serve via iSCSI services. Which filesystem do you recommends me to reach maximum performance: xfs, ext3, ext4, gfs2 ....?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

4 9

donations
by Jerry Geis 24 Dec '09

24 Dec '09

The donation page does not seem up to date: *Monetary* CentOS is currently reviewing our cash donation program. If you are looking to make a cash dontation to the CentOS Project, please check back here after August 15th, 2009. I sent an email to the webmaster but did not get a reply. I thought I would post. Anything new on this? Thanks, Jerry

2 1

/dev/video* permissions
by Boris Epstein 23 Dec '09

23 Dec '09

Hi all, Does anybody know where those permissions are controlled? I've looked in /etc/udev and everywhere else I could think of and thus far I have seen not a hint... Thanks in advance for all your help. Boris.

1 0

fully automatic installation FAI?
by David Mehler 23 Dec '09

23 Dec '09

Hello, Is anyone running a software package called FAI for Fully Automatic Installation on a CentOS server? I was wondering if there were any issues to running it? Thanks. Dave.

2 1

CentOS 5 and Fedora Core
by Matt 23 Dec '09

23 Dec '09

If memory serves me correctly I was told CentOS 4.x was based on Fedora Core 3. So when finding a rpm I always looked for one for Fedora Core 3 and then it seemed to install ok on CentOS 4. Is CentOS 5 the same way and if so what Core is it based on? Matt

5 4

eME627-5082 laptop and Linux?
by Scott Ehrlich 23 Dec '09

23 Dec '09

Anyone have experience with this laptop running C5 5.4 32 or 64-bit? Any known problems/issues? Thanks. Scott

1 0

iptables ... *BSD pf ... pfSense
by Götz Reinicke - IT Koordinator 23 Dec '09

23 Dec '09

Hi, I followed the "Optimizing CentOS for gigabit firewall" posting and as some posters wrote pf is soo sooo ssooooo mutch faster, I was thinking to give it a try. But I'm not familier to BSD so I was looking for some tools and found "pfsense" http://www.pfsense.org/ "pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router" Has any of the firewall guys on the list ever tested this distri? What do you think? Right now we run a iptables Shorewall system and had no problems so far, but having a "managed" firewall distri which rocks whould be an alternative. Cheers, 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

4 3

advanced routing, 2isp
by David Hláčik 23 Dec '09

23 Dec '09

Guys, please I have no luck with this. I have 2 ISPS. I have working configuration with ip route a 2 routing tables in a way, that matching local subnet uses second provider while all the others are using the first one - main. The main problem I am having is, that I am unable to reach my router via public ip address of that second ISP. This is my default routing table [root@sx1 cron.hourly]# ip route show table main 194.228.196.39 dev ppp0 proto kernel scope link src 90.178.76.117 10.123.50.101 dev ppp2 proto kernel scope link src 10.123.50.1 10.123.50.100 dev ppp1 proto kernel scope link src 10.123.50.1 213.194.242.0/24 dev eth1 proto kernel scope link src 213.194.242.198 10.123.20.0/24 dev eth0 proto kernel scope link src 10.123.20.1 10.123.10.0/24 dev eth0 proto kernel scope link src 10.123.10.11 10.123.11.0/24 dev eth0.8 proto kernel scope link src 10.123.11.1 10.123.42.0/24 dev eth0.5 proto kernel scope link src 10.123.42.1 10.123.123.0/24 dev eth0.7 proto kernel scope link src 10.123.123.1 10.123.40.0/24 dev eth0.4 proto kernel scope link src 10.123.40.1 10.123.30.0/24 dev eth0 proto kernel scope link src 10.123.30.1 10.123.44.0/24 dev eth0.6 proto kernel scope link src 10.123.44.1 169.254.0.0/16 dev eth0.8 scope link default via 213.194.242.1 dev eth1 As you can see , my default provider has gateway 213.192.252.1 , connected via eth1 . This works fine for me. Second configuration is ip rule based, when subnet 10.123.123.0/24 goes to routing table adsl [root@sx1 cron.hourly]# ip rule show 0: from all lookup 255 32764: from all fwmark 0x1 lookup adsl-vpn 32765: from 10.123.123.0/24 lookup adsl 32766: from all lookup main 32767: from all lookup default [root@sx1 cron.hourly]# ip route show table adsl 194.228.196.39 dev ppp0 scope link src 90.178.76.117 10.123.123.0/24 dev eth0.7 scope link src 10.123.123.1 default via 194.228.196.39 dev ppp0 As you can see in this case, all trafic goes via ppp0 (my second internet provider connected via ppp0 - adsl ppoe). This works fine. What I want to achieve is, now being able to ping /access/whatever to my server via second public IP address of my adsl provider (90.178.76.117). To achieve this i have added iptables rule, which marks all packets comming via ppp0 (iptables -t mangle -A PREROUTING -i ppp0 -j MARK --set-mark 0x1). And created another routing table named adsl-vpn [root@sx1 cron.hourly]# ip route show table adsl-vpn 194.228.196.39 dev ppp0 scope link src 90.178.76.117 10.123.10.0/24 dev eth0 scope link src 10.123.10.11 default via 194.228.196.39 dev ppp0 Now i have added ip rule, which for all packets marked as 1 , which are the ones which came trough ppp0 = my second ISP, uses table adsl-vpn [root@sx1 cron.hourly]# ip rule show 0: from all lookup 255 32764: from all fwmark 0x1 lookup adsl-vpn <--- this one 32765: from 10.123.123.0/24 lookup adsl 32766: from all lookup main 32767: from all lookup default Well, now I should be able definitely to ping my server from outside, but it does not works Pinging from windows machine in outside world : C:\Users\boss>ping 90.178.76.117 Pinging 90.178.76.117 with 32 bytes of data: Request timed out. Request timed out. Request timed out. Ping statistics for 90.178.76.117: Packets: Sent = 3, Received = 0, Lost = 3 (100% loss), If i will tcpdump my ppp0 interface on my router I see the ICMP echo requests are comming [root@sx1 cron.hourly]# tcpdump -i ppp0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 09:08:27.743789 IP adsl-dyn118.78-98-105.t-com.sk > gw2.cz.polarion.com: ICMP echo request, id 1, seq 72, length 40 But, echo responses from my server NOT, instead of that, responses are comming out of eth1 interface , which is my first ISP! [root@sx1 cron.hourly]# tcpdump -i eth1 |grep ICMP tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes 09:09:30.451706 IP gw2.cz.polarion.com > adsl-dyn118.78-98-105.t-com.sk: ICMP echo reply, id 1, seq 73, length 40 09:09:35.409704 IP gw2.cz.polarion.com > adsl-dyn118.78-98-105.t-com.sk: ICMP echo reply, id 1, seq 74, length 40 This means that either mange is not working or ip rule is not working . Please help, David

1 0

iptables -m connlimit
by Helmut Drodofsky 23 Dec '09

23 Dec '09

Hi, to the use of connlimit, I have found http://lists.centos.org/pipermail/centos/2008-June/059656.html Is there something new with centos 5.3 or 5.4? Helmut

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Discuss December 2009