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count of active tcp sockets?
by J Potter 18 Apr '08

18 Apr '08

Hi List, Is there an easy way to get a count of the number of active socket connections, or even better, number of socket connections in the time_wait state? (Something lightweight... under /proc/sys/net/ipv4/? I'd like to avoid the impact of listing out all the connections a-la netstat.) Thanks! -Jeff

4 4

stunnel
by CentOS List 18 Apr '08

18 Apr '08

Dear all, I had notice that my logwatch has a heap of stunneling like the one below. Is there a security breech? **Unmatched Entries** (1) LOG5[6504:3086657232]: Connection closed: 29433 bytes sent to SSL, 62 bytes sent to socket (1) LOG5[9516:3086649040]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 (1) LOG5[9516:3086649040]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP (1) LOG5[9516:3086649040]: Connection closed: 29433 bytes sent to SSL, 62 bytes sent to socket (1) LOG5[10472:3086608080]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 (1) LOG5[10472:3086608080]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP (1) LOG5[10472:3086608080]: Connection closed: 29434 bytes sent to SSL, 62 bytes sent to socket (1) LOG5[11422:3086517968]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 (1) LOG5[11422:3086517968]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP (1) LOG5[11422:3086517968]: Connection closed: 31916 bytes sent to SSL, 84 bytes sent to socket (1) LOG5[12306:3086350032]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 (1) LOG5[12306:3086350032]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP (1) LOG5[12306:3086350032]: Connection closed: 29482 bytes sent to SSL, 62 bytes sent to socket (1) LOG5[13201:3086767824]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 (1) LOG5[13201:3086767824]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP (1) LOG5[13201:3086767824]: Connection closed: 29482 bytes sent to SSL, 62 bytes sent to socket Thanks nic

3 2

CentOS 4.6 - dhcp issue
by Tom Brown 17 Apr '08

17 Apr '08

Hi - On my CentOS 4 cobbler server i am having some odd dhcp issues. There is only 1 dhcp server on the network and the cobbler box manages the dhcp. When i kick off the PXE install during the PXE phase things seem OK then when anaconda tried to get an IP sometimes things work out fine and other times it sits waiting for hostname/domainname. From the logs you can see that the mac requesting the IP is constant but the IP being offered is sometimes 'wrong'. In the 2 examples below nothing is changed the differing result is just achieved by trying another install, as i said its rather random. Any thoughts? thanks ** section of log i see when i have install issue ** Apr 16 14:25:53 cobbler dhcpd: DHCPDISCOVER from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:25:53 cobbler dhcpd: DHCPOFFER on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 14:25:53 cobbler dhcpd: DHCPDISCOVER from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:25:53 cobbler dhcpd: DHCPOFFER on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 14:25:53 cobbler dhcpd: DHCPREQUEST for 192.168.12.212 (192.168.12.117) from 00:0c:29:16:f8:b5 via eth0: lease 192.168.12.212 unavailable. Apr 16 14:25:53 cobbler dhcpd: DHCPNAK on 192.168.12.212 to 00:0c:29:16:f8:b5 via eth0 ** section of log when everything works OK ** Apr 16 14:31:42 cobbler dhcpd: DHCPDISCOVER from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:31:42 cobbler dhcpd: DHCPOFFER on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 14:31:44 cobbler dhcpd: DHCPREQUEST for 192.168.12.190 (192.168.12.161) from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:31:44 cobbler dhcpd: DHCPACK on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 13:31:44 cobbler in.tftpd[4334]: tftp: client does not accept options Apr 16 14:32:08 cobbler dhcpd: DHCPDISCOVER from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:32:08 cobbler dhcpd: DHCPOFFER on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 14:32:08 cobbler dhcpd: DHCPDISCOVER from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:32:08 cobbler dhcpd: DHCPOFFER on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0 Apr 16 14:32:08 cobbler dhcpd: DHCPREQUEST for 192.168.12.190 (192.168.12.161) from 00:0c:29:16:f8:b5 via eth0 Apr 16 14:32:08 cobbler dhcpd: DHCPACK on 192.168.12.190 to 00:0c:29:16:f8:b5 via eth0

2 5

I meet a problem on installing CentOS4.4 ServerCD.
by 관리자 17 Apr '08

17 Apr '08

4 5

Edit to change startup from SMP to not so SMP
by Andrew ＠ ATM Logic 17 Apr '08

17 Apr '08

I have an issue on a server that stops to ask SMP or not so SMP on bootup. Its a pain as its a remote unit, and if I update (or the power goes out for 3 hours) the server will not restart.... I remember back in the day editing a start up file to tell it what kernel to start... Is that the file I am looking for to tell it to autostart smp??? Anyone have a 101 on how to do this? Thanks,

4 6

policygentool in selinux-policy-devel-2.4.6-106
by Winslett, Chris 17 Apr '08

17 Apr '08

I just installed a fresh copy of Centos 5.1, yum upgraded all, and the following error occurred with selinux-policy-devel-2.4.6-106.el5_1.3 rpm. When I was trying to run policygentool, I was getting the following error: Traceback (most recent call last): File "/usr/share/selinux/devel/policygentool", line 25, in ? Import polgen ImportError: No module named polgen Turns out, online 25 the following diff should be made: - import polgen + import sepolgen I assume the Python module changed names. I uninstalled the RPM and reinstalled it to ensure I was getting the same error, and I did. Christopher Winslett Harbert Management Corporation

2 2

Installing Centos 5 on HP DL140 G3
by Kai Schaetzl 17 Apr '08

17 Apr '08

I want to install CentOS 5.1 with hardware RAID on an HP DL140 G3 server that I have here for testing. It prompts me for a storage controller. According to this readme page for the latest driver at ftp://ftp.hp.com/pub/softlib2/software1/pubsw-linux/p1463703615/v44436/mpt linux-4.00.13.01-2.rhel5.i686.dd.gz.txt CentOS 5 should already contain a "default driver version contained in the Red Hat Enterprise Linux 5 installation CD" I would rather like to use that than go the complicated route of providing the latest HP driver. That "HP Internal Port SAS/SATA HBA with RAID" actually is a RAID controller from LSILogic and I tried to load all four LSILogic drivers provided on the driver list, but none is accepted. Does somebody have experience with this server/RAID controller and can tell me if I can go somehow with the drivers provided by CentOS 5.1 or do I need to go with the drivers provided by HP? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

6 28

Question about RAID 5 array rebuild with mdadm
by Mark Hennessy 17 Apr '08

17 Apr '08

I'm using Centos 4.5 right now, and I had a RAID 5 array stop because two drives became unavailable. After adjusting the cables on several occasions and shutting down and restarting, I was able to see the drives again. This is when I snatched defeat from the jaws of victory. Please, someone with vast knowledge of how RAID 5 with mdadm works, tell me if I have any chance at all that this array will pull through with most or all of my data. Background info about the machine /dev/md0 is a RAID1 consisting of /dev/sda1 and /dev/sda2 /dev/md1 is a RAID1 consisting of /dev/sda2 and /dev/sdb2 /dev/md2 (our special friend) is a RAID5 consisting of /dev/sd[c-j] /dev/sdi and /dev/sdj were the drives that detached from the array and were marked as faulty. I did the following things that in hindsight were probably VERY BAD Step 1 (Misassign drives to wrong array): I could probably have had things going again in a tenth of a second if I hadn't typed this: mdadm --manage --add /dev/md0 /dev/sdi mdadm --manage --add /dev/md0 /dev/sdi This clobbered the superblock and replaced it with that of /dev/md0, yes? well, that's what mdadm --misc --examine /dev/sdi and sdj said anyhow. Ok, so what next? Step 2 (rebuild the array but make sure the params are right!): I wipe out the superblocks on all of the drives in the array and rebuild with --assume-clean for i in c d e f g h i j ; do mdadm --zero-superblock /dev/sd$i ; done mdadm --create /dev/md2 --assume-clean --level=5 --raid-devices=8 /dev/ sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj ok, now it says that the array is recovering and will take about 10 hours to rebulid. /dev/sd[c-i] say that they are "active sync" and /dev/sdj says it's a spare that's rebuilding. But now I scroll back in my history and see that oops, the chunk size is WRONG. Not only that, but I don't stop the array until the rebuild is at around 8% Ok, I stop the array and rebuild with mdadm --create /dev/md2 --assume-clean --level=5 --chunk --raid- devices=8 /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/ sdi /dev/sdj Now it says it's going to take another 10 hours to rebuild. How likely are my data irretrievable/gone and at what step would it have happened if so?

2 3

No Network = slow ??
by Michael A. Peters 17 Apr '08

17 Apr '08

I lost my internet connection earlier today. My home network was still up - it's just the router couldn't get an IP from the cable modem. During that period, my CentOS 5.1 install was extremely slow (2.6 GHz Athlon w/ 2GB ram) at starting non network applications - such as solitare and gnome terminal. It would pause for several seconds before finally starting them. The machine does run bind as a caching nameserver - as I've found that to be more reliable than using my ISPs nameserver, so I'm guessing the slowdown was with bind not being able to resolve anything. Is there anything I can do to prevent the slow application launching in the event of lost network in the future?

4 4

exam txt file
by Hiep Nguyen 17 Apr '08

17 Apr '08

hi all, i have centos 5 w/o gui. i can only have access via ssh. i have a text file that contains special (unprintable) characters, what editor i can use to exam what those character are??? i use vi, but i don't know what is ^@ may be an editor that can show ASCII as dec or hex. thanks

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