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[Fwd: Re: The directory that I am trying to clean up is huge]
by James B. Byrne 25 Jan '10

25 Jan '10

On Sat, January 23, 2010 20:21, Robert Nichols wrote: > Robert Heller wrote: > > Gosh, then I guess the manpage for 'find' must be totally wrong > where it > says: > > -exec command ; > ... > The specified command is run once for each matched > file. > Not wrong, just not very explicit regarding process. The man page does not say that find acts upon each file as it is found, only that it acts upon each file that is found. Neither does the man page speak to the limits of the kernel configuration (MAX_ARG_PAGES) implicitly used by cp, find, ls, etc. The problem you have is that the selection of all qualified files is completed before any are acted on by find. So, in your case of an overlarge collection, the page limit is exceeded before any are deleted. Taking each file as it is found and piping it to an external rm command explicitly defines the process as find, delete and find again, and thereby avoids hitting the page limit. CentOS-5.3 was supposed to address this issue: > Previously, the MAX_ARG_PAGES limit that is set in the kernel > was too low, and may have resulted in the following error: > > execve: Argument list too long > > In this update, this limit has been increased to 25 percent of > the stack size, which resolves this issue. So, perhaps if you update to 5.3+ the problem might go away? Although, in my opinion, piping find results through xargs is far more reliable and portable. Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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OT: reliable secondary dns provider
by Eero Volotinen 25 Jan '10

25 Jan '10

Sorry about a bit offtopic, but I am looking reliable (not free) secondary dns provider. -- Eero

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Re: [CentOS] DNS issue.. help ?!
by fabien faye 25 Jan '10

25 Jan '10

Hi, If you are working on real TLD, you have to change you dns server on the dns provider side. If you made a whois of your domain name : Example : http://generationip.com/whois?Whois=generationip.com Whois Server Version 2.0 Domain names in the .com and .net domains can now be registered with many different competing registrars. Go to http://www.internic.net for detailed information. Domain Name: GENERATIONIP.COM Registrar: EURODNS S.A Whois Server: whois.eurodns.com Referral URL: http://www.eurodns.com Name Server: NS1.EURODNS.COM Name Server: NS2.EURODNS.COM Status: clientTransferProhibited Updated Date: 05-mar-2009 Creation Date: 17-mar-2005 Expiration Date: 17-mar-2011 The named server define in this case is : Name Server: NS1.EURODNS.COM Name Server: NS2.EURODNS.COM those name server are declared at AUTHORITY server's, if you must define new dns server, you have to change the named server of this zone to your new authority server. Best regards Fabien FAYE RHCE www.generationip.com Free network tools & HOWTO for centos and Redhat ----- Original Message ----- From: "Roland Roland" <R_O_L_A_N_D(a)hotmail.com> To: "CentOS mailing list" <centos(a)centos.org> Sent: Monday, January 25, 2010 3:35:26 PM Subject: [CentOS] DNS issue.. help ?! Hi All, i have DNS configured on my centos 5.2 server. it's all working fine, right now i want to change the main public dns from one IP to another to do some testing (the new public dns ip has records which the old one doesnt have and it's done as such for testing) so i got into /etc/resolv.conf and changed the first nameserver to the NEW public DNS. /etc/init.d/network restart /etc/init.d/named restart when i issue an nslookup example.com ON the dns server, i get the exact IP i want to do testing on. but when i do nslookup example.com on the clients machine. the website resolves to another IP ( the one set in the initial public dns records) is there any other changes i need to do for the DNS server redirects its requests to the new public dns ? _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Automatically check into SVN?
by Mr Gabriel 25 Jan '10

25 Jan '10

I would like to automatically check in a directory to SVN, to maintain the changes that area made to those txt files over time. These files are configuration files, and it would be good to be able to revert back by simply checking out the older versions. But I would to check in the files every files minutes, and I'm sure SVN will not use up any disc space, unless there are any changes. I already have an svn server up and running in production -- Any help?

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Re: [CentOS] Too much cpu wait on nfs server when we need to read data on it
by fabien faye 25 Jan '10

25 Jan '10

Hi, You can find below the spec of my server: cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 37 model name : AMD Opteron(tm) Processor 248 stepping : 1 cpu MHz : 2200.034 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm bogomips : 4400.06 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp processor : 1 vendor_id : AuthenticAMD cpu family : 15 model : 37 model name : AMD Opteron(tm) Processor 248 stepping : 1 cpu MHz : 2200.034 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm bogomips : 4399.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp free total used free shared buffers cached Mem: 2059236 2049896 9340 0 9800 1874828 -/+ buffers/cache: 165268 1893968 Swap: 4095992 112 4095880 Linux 1-NFS.domain.com 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 20:57:57 EST 2009 x86_64 x86_64 x86_64 GNU/Linux --- Physical volume --- PV Name /dev/sdc1 VG Name vgspace PV Size 4.55 TB / not usable 1.97 MB Allocatable yes PE Size (KByte) 4096 Total PE 1192067 Free PE 795267 Allocated PE 396800 --- Physical volume --- PV Name /dev/sdd1 VG Name vgspace PV Size 4.55 TB / not usable 1.97 MB Allocatable yes PE Size (KByte) 4096 Total PE 1192067 Free PE 808067 Allocated PE 384000 I need ext4 for file bigger than 2TB. /dev/mapper/vgspace-vol1 on /vol/vol1 type ext4 (rw,noatime) /dev/mapper/vgspace-vol2 on /vol/vol2 type ext4 (rw,noatime) # tune2fs -l /dev/mapper/vgspace-vol1 tune2fs 1.39 (29-May-2006) tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/mapper/vgspace-vol1 Couldn't find valid filesystem superblock. # tune2fs -l /dev/mapper/vgspace-vol2 tune2fs 1.39 (29-May-2006) tune2fs: Filesystem has unsupported feature(s) while trying to open /dev/mapper/vgspace-vol2 Couldn't find valid filesystem superblock. export nfs : /vol/vol1 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash) /vol/vol2 192.168.*.0/255.255.255.0(async,no_subtree_check,rw,no_root_squash) Best regards Fabien FAYE ----- Original Message ----- From: "Jim Perrin" <jperrin(a)gmail.com> To: "CentOS mailing list" <centos(a)centos.org> Sent: Monday, January 25, 2010 2:27:41 PM Subject: Re: [CentOS] Too much cpu wait on nfs server when we need to read data on it On Mon, Jan 25, 2010 at 8:39 AM, fabien faye <fabien(a)faye.eu> wrote: > Hi, > > I have a big server with 24 Disk on 2 3ware card. Define 'big'. You're not giving much in terms of memory or cpu specs. > When i write data on my nfs server everything is fine but when i want to read data i have a lot of cpu wait. Okay. Have you looked at any performance tuning or elevator/scheduler adjustments? File system tuning? What have you tried on your own so far to debug this? > about the file system, i use ext4 on LVM partition. Why? Is there a performance reason for you to use ext4 vs ext3? > Do you have any idea about that. Not based on the little information you've provided. It would help for you to supply more detail, and the things you've already looked at. -- During times of universal deceit, telling the truth becomes a revolutionary act. George Orwell _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Too much cpu wait on nfs server when we need to read data on it
by fabien faye 25 Jan '10

25 Jan '10

Hi, I have a big server with 24 Disk on 2 3ware card. When i write data on my nfs server everything is fine but when i want to read data i have a lot of cpu wait. [root@NFS /]# vmstat 1 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 0 1 112 9592 7140 1879496 0 0 621 1180 6 2 0 2 86 11 0 0 9 112 10668 7148 1877760 0 0 84 21600 1926 454 0 3 49 49 0 1 3 112 9308 7156 1879092 0 0 1400 1580 2123 2009 0 2 50 48 0 0 0 112 9432 7156 1879476 0 0 3664 0 2275 2862 0 3 81 17 0 0 1 112 9212 7172 1879588 0 0 2196 32 2132 2293 0 2 66 32 0 1 0 112 9848 7180 1878864 0 0 1268 4168 1852 1934 0 2 84 14 0 0 7 112 11208 7180 1876936 0 0 92 13124 1339 355 0 2 50 48 0 0 0 112 10708 7188 1877512 0 0 628 16 1552 1014 0 1 84 16 0 0 1 112 10344 7188 1878044 0 0 472 0 1334 721 0 1 89 10 0 0 1 112 10372 7196 1878136 0 0 1936 32 2268 2850 0 2 50 48 0 0 0 112 10336 7192 1878312 0 0 2220 0 2308 2966 0 2 51 47 0 0 0 112 9716 7200 1879012 0 0 696 28 1484 885 0 1 89 11 0 0 2 112 9400 7200 1879280 0 0 236 0 2112 5819 0 8 75 18 0 0 0 112 9980 7196 1878816 0 0 1360 20 1840 1743 0 1 83 15 0 0 15 112 9168 7196 1879580 0 0 768 0 1423 728 0 1 91 9 0 0 0 112 10756 7200 1877752 0 0 4068 32 2788 4225 0 4 70 26 0 I have tuned nfs server with this option : RPCNFSDARGS="-N 2" RPCNFSDARGS="-N 4" MOUNTD_NFS_V3="yes" RPCNFSDCOUNT=160 about the file system, i use ext4 on LVM partition. Do you have any idea about that. Fabien FAYE RHCE www.generationip.com Free network tools & HOWTO for centos and Redhat

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Re: [CentOS] authentication failure
by fabien faye 25 Jan '10

25 Jan '10

Hi, I am a fail2ban user and i am very interested to have an autosent mail to the ip provider of the brute force ip address. Do you know if it is possible with fail2ban or if we have to rewrite action in fail2ban ?. Fabien FAYE RHCE www.generationip.com Free network tools & HOWTO for centos and Redhat ----- Mail Original ----- De: "Athmane Madjoudj" <athmanem(a)gmail.com> À: "CentOS mailing list" <centos(a)centos.org> Envoyé: Samedi 23 Janvier 2010 18:20:01 Objet: Re: [CentOS] authentication failure On Sat, Jan 23, 2010 at 6:14 PM, madunix <madunix(a)gmail.com> wrote: > I noticed that my server has a lot ca. 1000x auth failure from > different alocated in China / Romania and Netherlands per day since 3 > days > It looks to me like somebody was trying to get into server by guessing > my password by brute force. > what would be the best to stop this attack and how? the server running > apache mysql and ftp > PORT STATE SERVICE > 21/tcp open ftp > 80/tcp open http > 443/tcp open https > 3306/tcp open mysql > ... > Jan 22 16:07:14 user vsftpd(pam_unix)[17462]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=195.95.228.150 > Jan 22 16:07:16 user vsftpd(pam_unix)[16737]: check pass; user unknown > Jan 22 16:07:16 user vsftpd(pam_unix)[16737]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=195.95.228.150 > Jan 22 16:07:17 user vsftpd(pam_unix)[17462]: check pass; user unknown > Jan 23 17:23:52 user vsftpd(pam_unix)[20524]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=221.7.40.47 > Jan 23 17:23:55 user vsftpd(pam_unix)[20524]: check pass; user unknown > Jan 23 17:23:55 user vsftpd(pam_unix)[20524]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=221.7.40.47 > Jan 23 17:23:59 user vsftpd(pam_unix)[20524]: check pass; user unknown > Jan 23 17:24:58 user vsftpd(pam_unix)[20524]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=221.7.40.47 > Jan 23 00:37:47 user vsftpd(pam_unix)[1791]: check pass; user unknown > Jan 23 00:37:47 user vsftpd(pam_unix)[1791]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=217.23.14.168 > Jan 23 00:38:06 user vsftpd(pam_unix)[1791]: check pass; user unknown > Jan 23 00:38:06 user vsftpd(pam_unix)[1791]: authentication failure; > logname= uid=0 euid=0 tty= ruser= rhost=217.23.14.168 > ... > > Thanks > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > Maybe a brute force attack, try to install a HIDS like: APF/BFD: http://www.rfxn.com/projects/advanced-policy-firewall/ http://www.rfxn.com/projects/brute-force-detection/ Fail2ban: http://www.fail2ban.org/ Fail2ban is available in EPEL repos. HTH -- Athmane Madjoudj _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Username and Password
by Michael Makotore 25 Jan '10

25 Jan '10

Could you please help me I forgot my username and password. Regards Michael

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how to change fsize to unlimited..
by Yan Yu 25 Jan '10

25 Jan '10

Dear centos experts, I am wondering is there a way for me to change ulimit fsize parameter? I am trying to change it to unlimited, so I added the following line to /etc/security/limits.conf - - fsize -1 but it does not work, and a reboot will reset the content of limits.conf. thanks, yan

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iPod Touch/iPhone VPNs with CentOS.
by Bill Campbell 25 Jan '10

25 Jan '10

I am looking at options for VPN connections from iPhones and iPod Touches to CentOS systems. We use OpenVPN for connections with Windows, Mac OS X, and other Linux systems, but there don't appear to be any OpenVPN clients for iPhones (presumably because there are no tun/tap interfaces available yet). My experiences getting IPsec running on CentOS systems with OpenVPN have not been pretty. Any suggestions are welcome. Thanks. Bill -- INTERNET: bill(a)celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 Skype: jwccsllc (206) 855-5792 The stamping of paper is an operation so much easier than the laying of taxes, that a government, in the practice of paper emissions, would rarely fail, in any such emergency [such as an election], to indulge itself too far in the employment of that resource... -- Alexander Hamilton

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