Discuss April 2013

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168 participants
149 discussions

Formatting a USB Drive
by Jason T. Slack-Moehrle 11 Apr '13

11 Apr '13

Hi All, I have a Drobo, connected to a CentOS 6.4 box. The box sees it as /dev/sdg. I want to format it ext3 (as they dont support ext4) but when I try I get: # fdisk -u /dev/sdg WARNING: GPT (GUID Partition Table) detected on '/dev/sdg'! The util fdisk doesn't support GPT. Use GNU Parted. WARNING: The size of this disk is 17.6 TB (17592186044416 bytes). DOS partition table format can not be used on drives for volumes larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID partition table format (GPT). WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c'). So I run: # parted GNU Parted 2.1 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) select /dev/sdg Using /dev/sdg (parted) print Model: DROBO DroboPro (scsi) Disk /dev/sdg: 17.6TB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags (parted) and looking at an example of creating a partition: (parted) mkpart primary 106 16179 I dont know what to do next since I dont see any partitions listed. I dont know what do to for the start and end point, although the man page says "size in MB". Do I just say 0 to (and convert 16.0TB to MB? Yes, I know it says 17.6 TB but this model drobo can only support partitions up to 16tb without making a second partition. Can anyone provide some advice on that I am missing conceptually? Jason

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What about port 2048 for GRE(47) packaged in ip protocol
by yihect 11 Apr '13

11 Apr '13

Hi, all: I'm playing with Gre Tunnel programming in centos 6. I wrote my program in these steps: a, open /dev/net/tun device and ioctl with TUNSETIFF, get fd to tun device, say "tun0"; b, create one socket and use it to set tun0's ip address, namyly SIOCSIFADDR and SIOCSIFDSTADDR; and then turn it up; c, create one raw socket to send things which got from the tun0 device to other machine, and to receive packages which should be feeded into the tun0 device; Finally, I ran the program in two machines, say MA and MB, synchronously, and set route info in MA and MB too. The last environment is like this: 10.0.3.1/24 192.168.0.31/24 192.168.0.124/24 10.0.4.1/24 ---------- MA ------------------------------------------- MB ---------- tun0 eth0 eth0 tun0 When I ping MB in MA, and tcpdump eth0 in MA, I get: 15:06:39.712390 IP 192.168.0.31 > 192.168.0.124: GREv0, length 88: IP 10.0.3.1 > 10.0.4.1: ICMP echo request, id 28797, seq 1, length 64 15:06:39.713232 IP 192.168.0.124 > 192.168.0.31: ICMP 192.168.0.124 protocol 47 port 2048 unreachable, length 116 15:06:39.713667 IP 192.168.0.124 > 192.168.0.31: GREv0, length 88: IP 10.0.4.1 > 10.0.3.1: ICMP echo reply, id 28797, seq 1, length 64 15:06:39.713754 IP 192.168.0.31 > 192.168.0.124: ICMP 192.168.0.31 protocol 47 port 2048 unreachable, length 116 The 1st and 3rd lines is easy to understand, but what about the 2nd and 4th lines??? Is the raw package been sent up into gre protocol while caught by my program?? I have seen ICMP_PORT_UNREACH stuff been placed in ip_gre.c kernel code, but say it is "Impossible event". So, what's wrong, have I missed something in my program? Any suggestions are appreciated, thanks.

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Virtual Machine Manager error
by Rajagopal Swaminathan 10 Apr '13

10 Apr '13

Greetings, I am getting the following error when I start the Virtual machine manager [root@centos Desktop]# uname -a Linux blah.blah.blah 2.6.32-220.2.1.el6.x86_64 #1 SMP Fri Dec 23 02:21:33 CST 2011 x86_64 x86_64 x86_64 GNU/Linux Error polling connection 'qemu:///system': internal error Cannot find suitable emulator for x86_64 Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 440, in _tick conn.tick() File "/usr/share/virt-manager/virtManager/connection.py", line 1414, in tick newNets, self.nets) = self._update_nets() File "/usr/share/virt-manager/virtManager/connection.py", line 1277, in _update_nets lookup_func, build_class) File "/usr/share/virt-manager/virtManager/connection.py", line 1209, in _poll_helper if not check_support(): File "/usr/share/virt-manager/virtManager/connection.py", line 501, in is_network_capable virtinst.support.SUPPORT_CONN_NETWORK) File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 574, in check_conn_support return _check_support(conn, feature, conn) File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 443, in _check_support actual_drv_ver = _hv_ver(conn, uri) File "/usr/lib/python2.6/site-packages/virtinst/support.py", line 376, in _hv_ver ret = cmd(*args) File "/usr/lib64/python2.6/site-packages/libvirt.py", line 2823, in getVersion if ret == -1: raise libvirtError ('virConnectGetVersion() failed', conn=self) libvirtError: internal error Cannot find suitable emulator for x86_64 any clues? TIA -- Regards, Rajagopal

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About centos fresh install
by Andrei Rolando León Salas 10 Apr '13

10 Apr '13

Hi, first of all i want to thank you all that do this help. Without this i cold never put my own webserver. Now my question. I know when i have to install some software, they recommend a "fresh" install of centos, but my provider (we have server via internet and webmin) every fresh install says that i need to pay like 50$ ( alittle expensive for me). Im live i Costa RIca and here internet sucks thats why i use panama server. Now my question is: theres any form to restore to "default" a centos server? like windows 8 or like norton goback? i searh a lot via google but not sure if theres no way or i dont know how to search it. Sorry for my bad english. Hope could help me this time

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Problem building powerdns from EPEL
by Nikolaos Milas 10 Apr '13

10 Apr '13

Hi, I just tried to build using http://dl.fedoraproject.org/pub/epel/6/SRPMS/pdns-3.1-2.el6.src.rpm on CentOS 6.4 final (kernel: 2.6.32-358.2.1.el6.x86_64), but it failed when looking for ldap libs: Note: I did not change anything in the original spec file. ... + ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --target=x86_64-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --sysconfdir=/etc/pdns --libdir=/usr/lib64/pdns --disable-static --with-modules= --with-lua '--with-dynmodules= gmysql gpgsql pipe geo ldap gsqlite3' --enable-cryptopp ... checking for ldap_set_option in -lldap_r... no checking for ldap_set_option in -lldap... no configure: error: ldap library (libldap) not found However, libldap exists at the required place (/usr/lib64): $ ls -la /usr/lib64/ | grep ldap drwxr-xr-x. 4 root root 4096 Mar 11 16:06 evolution-openldap lrwxrwxrwx. 1 root root 10 Sep 21 2012 libldap-2.4.so.2 -> libldap.so -rw-r--r-- 1 root root 781914 Mar 20 15:57 libldapbackend.a -rwxr-xr-x 1 root root 1151 Mar 20 15:57 libldapbackend.la -rwxr-xr-x 1 root root 379419 Mar 20 15:57 libldapbackend.so lrwxrwxrwx. 1 root root 12 Sep 21 2012 libldap_r-2.4.so.2 -> libldap_r.so lrwxrwxrwx 1 root root 29 Mar 11 16:06 libldap_r.so -> /lib64/libldap_r-2.4.so.2.5.6 lrwxrwxrwx 1 root root 27 Mar 11 16:06 libldap.so -> /lib64/libldap-2.4.so.2.5.6 -rwxr-xr-x 1 root root 40320 Feb 22 09:49 libsmbldap.so.0 Here is the relevant part from config.log: ... configure:17992: checking for ldap_set_option in -lldap_r configure:18017: g++ -o conftest -D_GNU_SOURCE -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -DLDAP_DEPRECATED -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic conftest.cpp -lldap_r -lz >&5 /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libldap_r.so: undefined reference to `ber_sockbuf_io_udp' collect2: ld returned 1 exit status ... configure:18033: checking for ldap_set_option in -lldap configure:18058: g++ -o conftest -D_GNU_SOURCE -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -DLDAP_DEPRECATED -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic conftest.cpp -lldap -lz >&5 /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libldap.so: undefined reference to `ber_sockbuf_io_udp' collect2: ld returned 1 exit status .... Am I doing something wrong? Why it can't find the ldap libraries? Please advise. Thanks, Nick

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Audit logs source of account triggering it.
by Gregory Machin 10 Apr '13

10 Apr '13

Hi. The auditd logs are full of lines referencing 28756E6B6E6F776E207573657229 , but I can't identify this account type=USER_LOGIN msg=audit(1364926580.306:249814): user pid=22565 uid=0 auid=4294967295 ses=4294967295 msg='op=login acct=28756E6B6E6F776E207573657229 exe="/usr/sbin/sshd" hostname=? addr=127.0.0.1 terminal=ssh res=failed' What would typically cause this ? There are no other references in any of the other logs to 28756E6B6E6F776E207573657229 and its to long for our typical UID / GID . Thanks G

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How to determine 64 vs 32 bit processor
by Robert Moskowitz 10 Apr '13

10 Apr '13

I have been tied up with other work and Holidays. Now back to some server work that is long overdue. I lost an old server yesterday so it is crunch time. I believe my new platform is suppose to be an x86_64. The order form says 64 bit. I booted Centos 6.3 i386 liveCD to check the system out before an install. uname -i reports i386 dmidecode -t processor reports Characteristics of 64 bit capable. The processor is an AMD duo-core Opteron. I thought that in a prior thread I found that booting with an i386 live CD and using uname would confirm the processor type. It seems not. I am going to go with the various evidence and start a x86_64 install, but what is with uname? thanks

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How to patch a CentOS6 kernel
by Michael Mol 10 Apr '13

10 Apr '13

So I have a couple patches supplied to me by upstream in relation to a kernel bug[1], but I can't figure out how to patch the kernel. The CentOS wiki page discusses retrieving the kernel source[2], but doesn't describe how to apply patches. Instructions I've found apply to CentOS5, and RH has changed their kernel packaging since then. I've been banging my head on this off and on for quite a while, now. I've mucked with Gentoo and Debian packaging, but kernel RPMs are a new one for me... [1] http://bugs.centos.org/view.php?id=6343 [2] http://wiki.centos.org/HowTos/I_need_the_Kernel_Source

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Re: [CentOS] How to determine 64 vs 32 bit processor
by Robert Moskowitz 10 Apr '13

10 Apr '13

On 04/10/2013 10:04 AM, Reindl Harald wrote: > > Am 10.04.2013 15:58, schrieb Robert Moskowitz: >> I believe my new platform is suppose to be an x86_64. The order form >> says 64 bit. >> >> I booted Centos 6.3 i386 liveCD to check the system out before an install. >> >> uname -i >> >> reports i386 > no wonder, you boot a i386 kernel OK. I can 'llive' with this. Just somewhere in some forgotten past I picked up that uname would still recognize that it was on a 64bit system even with the i386 kernel. > simply boot a x86_64 liveCD > hence i have not seen x86 systems since years > > Simply type "grep flags /proc/cpuinfo" and if you see lm > you have a 64 bit CPU based system thanks > > [root@rh:~]$ grep flags /proc/cpuinfo | grep lm > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr > sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc > aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 > x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi > flexpriority ept vpid >

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Re: [CentOS] floppy drives
by James B. Byrne 10 Apr '13

10 Apr '13

On Tue, April 9, 2013 13:46, m.roth(a)5-cent.us wrote: > Fred Smith wrote: >> On Tue, Apr 09, 2013 at 12:21:10PM -0400, m.roth(a)5-cent.us wrote: >>> Frank Cox wrote: >>> > On Tue, 9 Apr 2013 10:19:33 -0400 >>> > m.roth(a)5-cent.us wrote: >>> > >>> >> Hmmm... didn't see it mounted, but I'll try more tonight. Last >>> night >>> >> included a) playing with system, and b) finishing up our federal >>> >> taxes.... > <snip> >>> I also can't seem to find the USB 3.5" drive I borrowed - lsusb >>> sees it >>> (at least since the last reboot), but trying to find it to mount it >>> is >>> something I'm still digging at, and I doubt mtools can find it. >> >> As far as I remember (I'm not as young as I used to be, and it's >> been a >> while), the 3.5" USB floppy drive here would recognize a (formatted) >> floppy when inserted and mount it automatically, on Centos 5.x. >> (assuming it contained a recognizable filesystem...) > > Even if there's nothing about floppies in /etc/fstab? Or is that > something I need to configure for autofs? >> Just to obtain some empirical data I have connected a usb 3.5 FDD unit to my CentOS-6.4 workstation and inserted a previously unused 3.5 HDFD. The Nautilus system automatically opened a window on my desktop and I was able to copy and removed files from the diskette without any difficulty. A peek into /media shows this: # tree /media /media └── disk 1 directory, 0 files While /etc/fstab shows me nothing that obviously relates to the fdd: # cat /etc/fstab # # /etc/fstab # Created by anaconda on Mon Sep 24 12:57:28 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_vhost04-lv_root / ext4 defaults 1 1 UUID=a9a7cc59-bd0c-4362-9ab6-f721e25df2f8 /boot ext4 defaults 1 2 /dev/mapper/vg_vhost04-lv_home /home ext4 defaults 1 2 /dev/mapper/vg_vhost04-lv_tmp /tmp ext4 defaults 1 2 /dev/mapper/vg_vhost04-lv_log /var/log ext4 defaults 1 2 /dev/mapper/vg_vhost04-lv_spool /var/spool ext4 defaults 1 2 /dev/mapper/vg_vhost04-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/vg_vhost04/lv_centos_repos /var/data/centos ext4 defaults 00 /dev/vg_vhost04/lv_home_byrnejb /home/byrnejb ext4 defaults 0 0 Mount on the other hand shows this: /dev/sdb on /media/disk type vfat (rw,nosuid,nodev,uhelper=udisks,uid=500,gid=500,shortname=mixed,dmask=0077,utf8=1,flush) And udisks show this: howing information for /org/freedesktop/UDisks/devices/sdb native-path: /sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/host10/target10:0:0/10:0:0:0/block/sdb device: 8:16 device-file: /dev/sdb presentation: /dev/sdb by-id: /dev/disk/by-id/usb-Y-E_DATA_USB_Floppy_Drive by-path: /dev/disk/by-path/pci-0000:00:1a.0-usb-0:1:1.0-scsi-0:0:0:0 detected at: Wed 10 Apr 2013 09:08:55 EDT system internal: 0 removable: 1 has media: 1 (detected at Wed 10 Apr 2013 09:09:07 EDT) detects change: 1 detection by polling: 1 detection inhibitable: 1 detection inhibited: 0 is read only: 0 is mounted: 1 mount paths: /media/disk mounted by uid: 500 presentation hide: 0 presentation nopolicy: 0 presentation name: presentation icon: size: 1474560 block size: 512 job underway: no usage: filesystem type: vfat version: FAT12 uuid: label: drive: vendor: Y-E DATA model: USB Floppy Drive revision: 0601 serial: WWN: detachable: 1 can spindown: 0 rotational media: Yes, unknown rate write-cache: unknown ejectable: 0 adapter: Unknown ports: similar devices: media: floppy compat: floppy interface: usb if speed: 12000000 bits/s ATA SMART: not available -- *** 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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Discuss April 2013