Discuss

discuss@lists.centos.org

34758 discussions

internet connection tester script
by kellyremo 29 Jan '11

29 Jan '11

http://pastebin.com/raw.php?i=rykHdvBh bix.hu and www.yahoo.com are "pingable" test sites. 127.0.0.1 could not be pinged [firewall drops all icmp] i have a "oneliner" that echoes if theres "internet connection or no". $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" internet connection ok $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" internet connection ok $ Ok! But: if i want the "oneliner" to only go along when theres internet connection: $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 127.0.0.1 >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 127.0.0.1 >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ It just doesn't work. Goal: if theres no internet connection, then the oneliner must loop until there is internet connection. if theres internet connection the oneliner ends. what am i missing?

5 5

Recommendation for a Linux alternative to Centos - ATH9K disaster
by Always Learning 29 Jan '11

29 Jan '11

I persuaded a reluctant friend to buy a new computer. I enthusiastically extolled the joys and benefits of Centos and promised to install it on his new machine - dual booting with Micro$oft Windoze 7. His super-duper new laptop arrived. Acer, AMD 4 core, fast etc. but not as nice looking as my impressive HP DV5. The wireless refused to connect. After 8 hours on Saturday I could sometimes see hubs in the neighbourhood but could not connect to my own hub using WPA2. iwlist wlan0 scan produced technical details of local hubs - but still could not connect. NetworkManager sometimes froze. Spent many hours Googling for his wifi adaptor Altheros AR928K which uses a driver known as ATH9K. Many others have had a similar problem. Kernel 2.6.27 apparently includes this driver but Centos 5.5 is 2.6.18. On my Sony Vaio netbook I abandoned XP and installed Centos 5.5. No wifi (yet XP had) but luckily for me I eventually discovered the Altheros AR8132 needed ATL1E which, for Centos 5.5, means a kernel modification. Luckily it is on Elrepo as kmod-atl1e. A quick Yum and I was connected. Many thanks to Elrepo. The netbook comes to life with Centos. Its now a really usable machine. XP on a netbook was pure crap. However ATH9K for Centos 5.5 does not exist. This afternoon I had to tell my friend his brand new computer is incompatible with Centos and wifi. Please can anyone recommend a suitable Linux variant with a kernel >= 2.6.27 that is a bit like Centos ? Does anyone know if Centos 5.6 will be on 2.6.18 and whether it will have drivers like ATH9K ? Anyone any idea what kernel version Centos 6 will have ? Thank you. Best regards, Paul GB Centos on 2 VPS, 2 desktops, 1 laptop and 1 netbook. Going cheap : genuine Windoze 95 and 98 installation disks :-)

25 67

TrueCrypt WD External Drive
by Michael D. Berger 28 Jan '11

28 Jan '11

I have a WD Elements 2TB USB hard drive. I would like to encrypt the whole drive with TrueCrypt on my CentOS box. Could someone direct me to a tutorial on how to do this? Ideally, I would also like to access it with my WinXP box, but this part is optional. Thanks for your help. Mike.

3 3

problems with installl ing icecast
by mike cutie and maia 28 Jan '11

28 Jan '11

hi I run this to start the icecaste install and near the end I get this error c belowurned 1 exit status rpmbuild -bb /usr/src/redhat/SPECS/icecast.spec /usr/lib/libxml2.so -ldl -lz -lm /usr/lib/libxslt.so: undefined reference to `xmlX pathcontextSetCache' collect2: ld ret

2 1

Re: [CentOS] Ext4 on CentOS 5.5 x64
by Giuseppe Tanzilli - ServerPlan 28 Jan '11

28 Jan '11

Hi, it works just fine for me, but there is no quota support in the 5.5 ext4 release Giuseppe Il 28/01/2011 08:51, Sorin Srbu ha scritto: >> -----Original Message----- >> From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On >> Behalf Of compdoc >> Sent: Thursday, January 27, 2011 5:09 PM >> To: 'CentOS mailing list' >> Subject: Re: [CentOS] Ext4 on CentOS 5.5 x64 >> >>> For those of you that have been using the ext4 technology preview on >> CentOS 5.5, how has it panned out? Does it perform as expected? How do you > feel the >> stability, creation of the FS and the administration of it is? Ideas and >> comments welcome. >> >> >> I've recently been using ext4 because I have servers with large(ish) > storage >> volumes, and because I know that the next version of centos will support it >> better than 5.5. >> >> I only use it for storage, where I use rsync to copy terabytes of data to >> and from the servers. >> >> It works fine - it's been set and forget so far. Very fast read/write >> speeds. > Same story here. I'm building a new backup server from scratch (with no old > data on it), and while ext3 is nice and stable it's also pretty slow when we > start talking sevenish terabytes. > > My main concern is all the writing on the interweb regarding running an fsck > and a tune2fs after having formatted the filesystem to ext4; some say you > should while some say it isn't necessary. > Anyway, I get a bad block message when running fsck, and am not sure > whether this is a interface problem between the chair and the monitor or > something with the tech preview. > > > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos

1 0

SSH Automatic Log-on Failure - Centos 5.5
by Always Learning 28 Jan '11

28 Jan '11

Hallo, I wanted to avoid typing-in my password every occasion I remotely logged-on to a server. I created my SSH keys and copied the public part to the server and renamed it authorized_keys. My command line is: ssh root(a)xxxxxx.com -p 1234 The output shows the logging-on routine wants 3 types of authentication. Surely one successful authentication is sufficient ? OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to xxxxxx [123.123.123.123] port 1234. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/identity type -1 debug1: identity file /root/.ssh/id_rsa type 1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: loaded 3 keys debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_4.3 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'xxxxxx' is known and matches the RSA host key. debug1: Found key in /root/.ssh/known_hosts:4 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /root/.ssh/id_dsa debug1: Next authentication method: password ------------------- files in client /root/.ssh are:- -rw------- 1 root root 1675 Jan 27 03:11 id_rsa -rw-r--r-- 1 root root 403 Jan 27 03:11 id_rsa.pub -rw-r--r-- 1 root root 2022 Jan 27 03:07 known_hosts --------------------------------------------- server /root/.ssh id_rsa.authorized_keys -rw-------- -------------------------------------------- The only active lines in /etc/ssh/ssh_config are Host * GSSAPIAuthentication yes SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT SendEnv LC_IDENTIFICATION LC_ALL -------------------------------------------- After commenting-out GSSAPIAuthentication yes in /etc/ssh/ssh_config the remainder of a new debug report is:- ... debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /root/.ssh/id_dsa debug1: Next authentication method: password All advice most gratefully received. -- With best regards, Paul. England, EU.

19 42

Re: [CentOS] Ext4 on CentOS 5.5 x64
by compdoc 28 Jan '11

28 Jan '11

>For those of you that have been using the ext4 technology preview on CentOS 5.5, how has it panned out? Does it perform as expected? How do you feel the stability, creation of the FS and the administration of it is? Ideas and comments welcome. I've recently been using ext4 because I have servers with large(ish) storage volumes, and because I know that the next version of centos will support it better than 5.5. I only use it for storage, where I use rsync to copy terabytes of data to and from the servers. It works fine - it's been set and forget so far. Very fast read/write speeds.

3 2

Static assignment of SCSI device names?
by Chuck Munro 27 Jan '11

27 Jan '11

Hello list members, In CentOS-5.5 I'm trying to achieve static assignment of SCSI device names for a bunch of RAID-60 drives on a Supermicro motherboard. The "scsi_id" command identifies all drives ok. The board has one SATA controller and three SAS/SATA controllers ... standard on-board ICH-10 ATA channels, an on-board LSI SAS/SATA controller, and two add-on SAS/SATA contoller cards. There are 13 drives in all, spread across the four controllers, all configured for Linux software RAID. The problem is in management of the drive names and figuring out which drive to pull in case of failure. Unfortunately the BIOS scan detects only the three drives connected to the ICH-10 SATA controller. That's ok because that's where the RAID-1 boot drives are. However, when the kernel starts it assigns those drives last, not first. For this reason I want to use a set of udev rules to assign specific names to the drives plugged into specific ports (to maintain my sanity :-) ). Identifying drives by their ID string (which includes the drive's serial number) and assigning names in the rules works ok. BUT, what happens when I have to swap out a failed drive? The serial number (and possibly model number) changes, and the udev assignment should fail, probably assigning an unexpected /dev/sd? name. RAID rebuild would choke until I change the MD device assignment. Is it possible to assign SCSI drive names by hardware path instead? I especially want the three RAID1+spare boot drives to always be assigned sda/sdb/sdc, because that sorts out other issues I'm having in CentOS-5. In the udev rules file I tried piping the output of "scsi_id -g -i -u -s /block/..." through "cut" to extract the path, but I get no match string when I run "udevtest" against that block device. Does the "PROGRAM==....." clause not recognize the pipe symbol? I tried a little shellscript to provide the RESULT match string, but udevtest didn't like that. Is there a supported way to predictably assign a drive name according to the hardware port it's plugged into ... it would make swapping drives a lot easier, since it becomes 'drive-id-string' agnostic. Better yet, is there any way to tell the kernel the order in which to scan the controllers? I'm also hoping the problem doesn't radically change when I install CentOS-6 on this box. I'm using CentOS-5 just to get practice in using KVM and RAID-60. Thanks for any advice you can offer. Chuck

3 2

how to unmount an NFS share when the NFS server is unavailable?
by Rudi Ahlers 27 Jan '11

27 Jan '11

Hi All, How do I unmount an NFS share when the NFS server is unaivalable? I tried "umount /bck" but it "hangs" indefinitely "umount -f /bck" tells me the mount if busy and I can't unmount it: root@saturn:[~]$ umount -f /bck umount2: Device or resource busy umount: /bck: device is busy umount2: Device or resource busy umount: /bck: device is busy This non-working NFS share is causing problems on the server and I need to unmount it until such a time when the NFS server (faulty NAS) is repaired. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

11 25

#!/bin/csh -v not work on CENTOS 5.5
by mcclnx mcc 27 Jan '11

27 Jan '11

We have several "csh" batch scripts using "#!/bin/csh -v". It work fine, before Centos 5.5. After cenos 5.5, it will NOT execute and only list history. Anyone know why? Thanks.

4 5

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss