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how to rescan serial ports without reboot
by Rudi Ahlers 03 Dec '08

03 Dec '08

Hi all, I hope this is possible. I have a server, with a network switch attached to the serial port, and I want to rescan the serial port (/dev/tty) to see if it picks it up? I'd prefer not to reboot the server if at all possible. dmesg reports ttyS0 as the active port: [root@zabackup01 ~]# dmesg |grep tty Bootdata ok (command line is ro root=/dev/System/root rhgb quiet xencons=tty6) Kernel command line: ro root=/dev/System/root rhgb quiet xencons=tty6 WARNING: Failed to register Xen virtual console driver as 'tty1' serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A ttyS0: 1 input overrun(s) ttyS0: 1 input overrun(s) running screen /dev/ttyS0 doesn't show up anything, and I should at least get the switch's login prompt. -- Kind Regards Rudi Ahlers

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Strange UserID Issue
by Mohan 03 Dec '08

03 Dec '08

Hi Guys, I have a setup where i have a user named root4 whose uid and gid are set to 0 so that it behaves as root user. The root user has ssh keys configured to access other servers . In the existing setup all other servers with similar setup shows whoami as root ,though i login with the username root4. In one of the servers all of a sudden it shows as root4 instead of root. The only change i did a day ago was installed fluxbox and k3b for burning dvd-backups in the server itself. Since it shows whoami as root4. ssh checks /home/root4/.ssh for ssh keys instead of checking in /root/.ssh/ so i have to copy all the keys manually from default location to /home/root4/.ssh to get the ssh key based authentication working . This machine runs centos 4.5 Id still shows uid =0 (root4) gid=0(root) groups=0(root) but its supposed to show uid =0 (root) gid=0(root) groups=0(root) Earlier all files in /home/root4 are owned by user and group root.root now it shows root4. root. i checked the passwd file last modification date and it hasnt been changed for months. root4:x:0:0::/home/root4/:/bin/bash selinux is disabled $HOME=/home/root4 -- which is normal. I dont know why it behaves all of a sudden. does anyone have experienced similar problem ? Where should i look for to fix this issue ? Any help would be much appreciated. -- Regards, Mohan.

2 1

mysql question
by ann kok 03 Dec '08

03 Dec '08

Hi All Can I know what is the meaning of the position? Why there is nothing in the "Binlog_Ignore_DB" mysql> show master status; +-------------------+----------+---------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +-------------------+----------+---------------+------------------+ | mysqld-bin.000006 | 183219 | dbname,dbname | | +-------------------+----------+---------------+------------------+ Thank you __________________________________________________________________ Instant Messaging, free SMS, sharing photos and more... Try the new Yahoo! Canada Messenger at http://ca.beta.messenger.yahoo.com/

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Xen-Version in CentOS 5.3?
by Dirk H. Schulz 03 Dec '08

03 Dec '08

Hi folks, I tried to find out what xen version upstream intends to use in 5.3, but did not find anything. So now I hope that there is some secret knowledge among the CentOS people you could share? :-) Any hint or link would be helpful. Thanks in advance, Dirk

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CentOS-4 Xen kernel with low RAM and Badness in local_bh_enable at kernel/softirq.c:141
by Kingsly John 03 Dec '08

03 Dec '08

I have small xen VM running centos4 which acts as a router/firewall, and has been working fine for over 1.5 years with 32MB of RAM and a kernel I either got from xensource.org or built myself from their sources. (centos 4 didn't have a xen kernel back then) I lost the kernel to a corrupted disk and decided to use the centos provided xen kernel. All these months 32MB + 64MB Swap was more than sufficient and I never had any problems.(3-digit uptimes) The CentOS Xen kernel is unusable at 32MB and invokes the OOM killer even though there is plenty of swap free (and about 5-10MB of RAM too). After the OOM killer has done it's job there's about 15 MB of RAM free and swap is hardly used at all (1MB at most) I've increased RAM to 64MB and the OOM killer doesn't kick in.. but I am seeing plenty of such messages in the logs ... Dec 2 16:05:21 noc kernel: Badness in local_bh_enable at kernel/softirq.c:141 Dec 2 16:05:21 noc kernel: [<c0121178>] local_bh_enable+0x47/0x6f Dec 2 16:05:21 noc kernel: [<c02177d5>] skb_checksum+0x133/0x25e Dec 2 16:05:21 noc kernel: [<c0250f06>] udp_poll+0x66/0x113 Dec 2 16:05:21 noc kernel: [<c02135fd>] sock_poll+0x19/0x1d Dec 2 16:05:21 noc kernel: [<c016d1a6>] do_select+0x190/0x2c7 Dec 2 16:05:21 noc kernel: [<c016ceb5>] __pollwait+0x0/0x9b Dec 2 16:05:21 noc kernel: [<c0144ae4>] __kmalloc+0x56/0xd3 Dec 2 16:05:21 noc kernel: [<c016d5dc>] sys_select+0x2e7/0x45c Dec 2 16:05:21 noc kernel: [<c010740f>] syscall_call+0x7/0xb Any idea what's causing it / how to make it stop ? I'm running Centos 5 in Dom0 and CentOS 4 in the router domU and there's another couple of Centos 5 domU which are running error free. Kingsly -- --------------------------------------------------------------------------- Kingsly At Users Dot SourceForge Dot Net -- http://kingsly.org/ ---------------------------------------------------------------------------

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Looking for uuid-devel
by Robert Moskowitz 03 Dec '08

03 Dec '08

Just pulled the lastest patches to HIPL (well the last replay was 11/24, so a number of nights behind) and tried a 'make rpm' and got the error: error: Failed build dependencies: uuid-devel is needed by hipl-1.0.4-1.i386 And I can'd find any rpm that has this module. I have tried different things in yum and have not found it. resolvedep, whatprovides, info, list. Nada. I did find a uuidd, but I can't see what files it contains. Note that the author of whatever patch hit me with this dependency is most likely NOT using Centos or even Fedora as their development platform. Where can I find uuid-devel????

2 2

how to configure the mail server to put the code before sending the mail
by ann kok 03 Dec '08

03 Dec '08

Hi All How to configure the mail server to put the code before sending out the mail? eg: When I send out the mail to yahoo to some receiver's address, it needs me to put the number and letter as same as the box before sending out the mail Thank you __________________________________________________________________ Be smarter than spam. See how smart SpamGuard is at giving junk email the boot with the All-new Yahoo! Mail. Click on Options in Mail and switch to New Mail today or register for free at http://mail.yahoo.ca

3 2

My God, it is full of stars
by Ralph Angenendt 03 Dec '08

03 Dec '08

And it is fast! And big! And louder! What is? The new CentOS mail server is, which coincidentally also hosts the mailing lists you are reading right now. After three short hours and (AFAICS) no lost mail we now have the following situation: The mailq on the old mail server now is empty, while the new one is already fighting with stale dns info, unknown users, deferrals and so on. Normal insanity, I'd say. One word to our moderators and/or mailing list administrators: Everything should work as it did on the old machine. If your list *admin* password isn't working anymore, please drop me a mail so we can clear that up. Everybody else: Send even more mails! The infrastructure for that is here now! Cheers, Ralph

12 15

iptables-save: INPUT DROP [26:8260]
by Alexander Farber 03 Dec '08

03 Dec '08

Hello, why does iptables-save print 2 numbers in square brackets? Is it used for anything? Is it number of inspected packets (and what's the other number then)? And what does *filter mean? Thank you Alex $ sudo iptables-save # Generated by iptables-save v1.3.5 on Tue Dec 2 23:53:56 2008 *filter :INPUT DROP [26:8260] :FORWARD DROP [0:0] :OUTPUT ACCEPT [376:82274] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 1/min --limit-burst 3 -j ACCEPT COMMIT # Completed on Tue Dec 2 23:53:56 2008 $ cat /etc/*release CentOS release 5.2 (Final) 2008010200

3 2

mysql question
by ann kok 03 Dec '08

03 Dec '08

Hi Do you know any good mysql mailing list? I have question what is the different between /var/lib/mysql/mysql.sock /var/lib/mysql/mysqld.sock Thank you __________________________________________________________________ Instant Messaging, free SMS, sharing photos and more... Try the new Yahoo! Canada Messenger at http://ca.beta.messenger.yahoo.com/

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