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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?
by Brian McKerr 07 Dec '09

07 Dec '09

diff -y ? On Wed, Dec 2, 2009 at 7:42 PM, Simon Banton <centos(a)web.org.uk> wrote: > At 08:54 +0000 2/12/09, hadi motamedi wrote: > >Dear All > >Can you please do me favor and let me know how can I compare two > >files but not in line-by-line basis on my CentOS server ? I mean say > >row#1 in file1 has the same data as say row#5 in file2 , but the > >comm compares them in line-by-line basis that is not intended . It > >seems that the diff cannot do the job as well > > This'll show you which lines are common to both files, and for the > ones that aren't which file they're in. > > perl -MData::Dumper -le 'while(<>) {chomp; push @{$s->{"$_"}}, > $ARGV}; END{ print Dumper($s) }' file1 file2 > > ... someone will be along shortly with a more elegant method. > > HTH > > S. > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos >

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Re: [CentOS] Is ext4 safe for a production server?
by Brent L. Bates 07 Dec '09

07 Dec '09

XFS is the most stable file system I've seen or used. I've seen it survive power failures and disk problems with out a problem. It is the ONLY file system I trust. It is stable, reliable, dependable, and practically bullet proof. I've been using XFS almost since it came into existence on SGI's (IRIX) and we've been using it under Linux for years too, also with out problems.

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Kickstart wrong swap size
by Lars Hecking 07 Dec '09

07 Dec '09

All machines kickstarted here consistently have a swap partition with the wrong size. According to the RHEL5 manual: | To determine the size of the swap partition automatically, use the | --recommended option: | | swap --recommended | | The recommended maximum swap size for machines with less than 2GB of RAM is | twice the amount of RAM. For machines with 2GB or more, this recommendation | changes to 2GB plus the amount of RAM. However, the swap partition on all kickstarted machines is 2GB, regardless of RAM size. This is the relevant portion of the kickstart file: bootloader --location=mbr selinux --disabled reboot clearpart --all --initlabel part /boot --fstype ext3 --size=102 part / --fstype ext3 --size=20480 part swap --recommended part /var --fstype ext3 --size=1 --grow The kickstart setup is currently based on CentOS 5.2 (and I cannot move to 5.4 yet as this is a corporate setup affecting hundreds of machines). Hardcoding swap size isn't a good idea either because there's a range of different memory configurations. I could however confirm that a manual, graphical install from the 5.4 DVD with recommended settings creates 10GB swap on a 8GB RAM machine.

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Resizing / partition ?
by armann 07 Dec '09

07 Dec '09

Hi. I know this has probably been discussed a lot so I'm sorry, noob here. I found a good tutorial here: http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition My only problem is understanding this. "To calculate the new End sector, ADD the partition Start sector to the PV PSize, and then add a safety margin of around 131072 sectors (64MB) to that." If anybody has another way of doing this or any comments that would be great. Thanks. Armann Jakob Palsson

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Name Resolution Broken for One Address
by John Thomas 07 Dec '09

07 Dec '09

I seem to have broken my laptop and have been unable to figure it out. Name resolution works great, except one address, which seems to be resolving to 0.0.0.1. Could you help me figure out what I have done and fix it? The following lines are in /etc/hosts 192.168.11.1 dev.example.com 192.168.11.1 dev1.example.com Pinging any other address that I try works, except dev.example.com. CentOS54[root@ctlaptop etc]# ping dev1.example.com PING dev1.example.com (192.168.11.1) 56(84) bytes of data. 64 bytes from dev.example.com (192.168.11.1): icmp_seq=1 ttl=64 time=0.093 ms <snip> CentOS54[root@ctlaptop ~]# ping dev.example.com connect: Invalid argument CentOS54[root@ctlaptop ~]# strace ping dev.example.com execve("/bin/ping", ["ping", "dev.example.com"], [/* 33 vars */]) = 0 brk(0) = 0x88f1000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=82386, ...}) = 0 mmap2(NULL, 82386, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f8b000 close(3) = 0 open("/lib/libresolv.so.2", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300p\277\0004\0\0\0"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=76400, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f8a000 mmap2(NULL, 75976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xd62000 mmap2(0xd71000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe) = 0xd71000 mmap2(0xd73000, 6344, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xd73000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\277.\0004\0\0\0"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1611564, ...}) = 0 mmap2(NULL, 1328580, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x994000 mmap2(0xad3000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13f) = 0xad3000 mmap2(0xad6000, 9668, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xad6000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f89000 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f896c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 mprotect(0xad3000, 8192, PROT_READ) = 0 mprotect(0xd71000, 4096, PROT_READ) = 0 mprotect(0x15e000, 4096, PROT_READ) = 0 munmap(0xb7f8b000, 82386) = 0 socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3 getuid32() = 0 setuid32(0) = 0 brk(0) = 0x88f1000 brk(0x8912000) = 0x8912000 getpid() = 5376 open("/etc/resolv.conf", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=109, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "# Generated by NetworkManager\ndo"..., 4096) = 109 read(4, "", 4096) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 socket(PF_FILE, SOCK_STREAM, 0) = 4 fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"...}, 110) = 0 send(4, "\2\0\0\0\r\0\0\0\6\0\0\0hosts\0", 18, MSG_NOSIGNAL) = 18 poll([{fd=4, events=POLLIN|POLLERR|POLLHUP}], 1, 5000) = 1 ([{fd=4, revents=POLLIN}]) recvmsg(4, {msg_name(0)=NULL, msg_iov(2)=[{"hosts\0", 6}, {"\270O\3\0\0\0\0\0", 8}], msg_controllen=16, {cmsg_len=16, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {5}}, msg_flags=0}, 0) = 14 mmap2(NULL, 217016, PROT_READ, MAP_SHARED, 5, 0) = 0xb7f54000 close(5) = 0 close(4) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4 connect(4, {sa_family=AF_INET, sin_port=htons(1025), sin_addr=inet_addr("0.0.0.1")}, 16) = -1 EINVAL (Invalid argument) dup(2) = 5 fcntl64(5, F_GETFL) = 0x2 (flags O_RDWR) fstat64(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 _llseek(5, 0, 0xbfd43234, SEEK_CUR) = -1 ESPIPE (Illegal seek) write(5, "connect: Invalid argument\n", 26connect: Invalid argument ) = 26 close(5) = 0 munmap(0xb7f9f000, 4096) = 0 exit_group(2) = ? -- Sincerely, John Thomas

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Invitation to connect on LinkedIn
by Gustavo Pastorino 07 Dec '09

07 Dec '09

LinkedIn ------------ Gustavo Pastorino requested to add you as a connection on LinkedIn: ------------------------------------------ Romeo, I'd like to add you to my professional network on LinkedIn. - Gustavo Accept invitation from Gustavo Pastorino http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/pm… View invitation from Gustavo Pastorino http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/39… ------------------------------------------ Why might connecting with Gustavo Pastorino be a good idea? People Gustavo Pastorino knows can discover your profile: Connecting to Gustavo Pastorino will attract the attention of LinkedIn users. See who's been viewing your profile: http://www.linkedin.com/e/wvp/inv18_wvmp/ ------ (c) 2009, LinkedIn Corporation

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Re: [CentOS] NFS new security requirements?
by Mike Yates 07 Dec '09

07 Dec '09

This now mysteriously resolved after both servers have rebooted. The long delay is due to the importance of high availability over the nfs links. Mike Yates Hawkgrove Ltd - Software Systems Design 2, The Business Courtyard, Marl Pits Lane, Trudoxhill, Frome, Somerset, BA11 5DL, UK +44 (0)1373 837900 fax: +44 (0)8700 518155 Registered in England: 2756481 VAT Reg: UK 601 1137 11 Registered Office: NSO Associates LLP, 75 Springfield Road, Chelmsford, Essex CM2 6JB All e-mail is subject to contract and is not intended to create a legally binding agreement. Hawkgrove Ltd will only be bound by an agreement in writing signed by an authorized signatory. All outgoing email is scanned by Kerio, using ClamAV 0.95.1/10117/Mon Dec 7 02:21:53 2009 Known viruses: 662464.

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centos vs rhel vs scientific linux
by Robert P. J. Day 07 Dec '09

07 Dec '09

i'm prepping to teach a 5-day intro class in linux starting in about 3 hours, and the courseware is clearly designed around RHEL (apparently 5.1). but since i'm not being provided with RHEL DVDs, i'm just going to hand everyone a centos 5.4 DVD and take it from there. as part of the intro, i want to briefly discuss the varieties of linux related to RHEL, so obviously i want to mention what centos is all about. in a nutshell, it's simply RHEL with any RH-proprietary branding removed, yes? what's the simplest way to sum up the difference in a sentence or two? and i've never used SL but, again as i understand it, it's also RHEL unbranded but, IIRC, SL is more open to producing updates, whereas centos is rigourous about tracking the corresponding RHEL version. does that sound about right? rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Linux Consulting, Training and Kernel Pedantry. Web page: http://crashcourse.ca Twitter: http://twitter.com/rpjday ========================================================================

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using an alternate audio driver in C5.4
by Mr. X 07 Dec '09

07 Dec '09

Hello, C5.4 on Abit kn9 ultra with MCP55 chipset, model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+ #lspci 00:06.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2) sudo lsmod | grep hda snd_hda_intel 584593 1 snd_pcm 116681 2 snd_hda_intel,snd_pcm_oss snd_page_alloc 44113 2 snd_hda_intel,snd_pcm snd_hwdep 43593 1 snd_hda_intel snd 100073 11 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer Is there a way to use the ac97 drivers instead of the hda_intel? I want to explore this cause Qemu has an ac97 driver. If I can make my audio compatible with the Qemu sound, then I can use guest and local audio at the same time! -- Mark

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OT: How can I tell if a web site is now blocking IPs from my country?
by Lanny Marcus 07 Dec '09

07 Dec '09

I have always been able to browse, without any problems, http://www.mobile-review.com/index-en.shtml but for the past 2 or 3 days, Mozilla Firefox just hangs "connecting to ...." How can I tell if they have started blocking IP addresses from Colombia? I would like to do that, before I post to the IPCop mailing list. I have my IPCop box set up to do DNS Caching, so possibly something went awry there. I use OpenDNS.com and I refreshed their Cache for this web site. I am not having problems browsing other web sites. The site is up and my desktop is dual boot and the same thing happens if I boot to M$ Windows. TIA! An error occurred while loading http://www.mobile-review.com/index-en.shtml: Timeout on server Connection was to www.mobile-review.com at port 80 An error occurred while loading http://www.mobile-review.com/: Timeout on server Connection was to www.mobile-review.com at port 80 above is with Konqueror web browser http://downforeveryoneorjustme.com/http://www.mobile-review.com/index-en.sh… It's just you. http://www.mobile-review.com is up. above from http://downforeveryoneorjustme.com/ Lanny -------------------------------------- Magazine subscriptions Largest discount Credit/Debit Card Check Pay Pal http://lowcostmagazines.com/

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