Discuss September 2009

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300 participants
293 discussions

rescan usb hd
by Bazooka Joe 23 Sep '09

23 Sep '09

I have a usb hd that I use for backup. Occasionally it dies. scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device Buffer I/O error on device sdc1, logical block 0 lost page write due to I/O error on sdc1 EXT2-fs error (device sdc1): read_inode_bitmap: Cannot read inode bitmap - block_group = 129, inode_bitmap = 4227073 scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device Buffer I/O error on device sdc1, logical block 0 lost page write due to I/O error on sdc1 EXT2-fs error (device sdc1): ext2_readdir: bad page in #2 scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device Buffer I/O error on device sdc1, logical block 0 lost page write due to I/O error on sdc1 EXT2-fs error (device sdc1): ext2_get_inode: unable to read inode block - inode=2, block=1027 scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device Buffer I/O error on device sdc1, logical block 0 lost page write due to I/O error on sdc1 EXT2-fs error (device sdc1): ext2_readdir: bad page in #2 If i unmount it and try to remount it it says sdc1 does not exist. I am not at the location so physically unplugging then replugging in the drive isn't a convenient option. How can I get the os to rescan the usb device so I can remount? thx bazooka

6 10

Video capture under CentOS
by MHR 23 Sep '09

23 Sep '09

I recently purchased a Diamond VC500 video capture device that runs on the USB. It has some interesting issues under Windoze, but I was wondering: I did a google for video catpreu and linux and most of what I found either said it can't be done or the software that did/does it is obsolete. Can anyone point me in a better direction (and which way)? Thanks. mhr

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Re: [CentOS] sshd options - centos 5.3
by Karl Kobata 23 Sep '09

23 Sep '09

I want to thank everyone for contributing to solving the implementation problem I was having. It seems in the end it was an "operator" problem. To summarize the results: - regarding sshd port change - uncomment port, and change the port number entry in /etc/ssh/sshd_config. Restart the sshd service. Update /etc/sysconfig/iptables to reflect the port number change from 22 to the port number specified in / etc/ssh/sshd_config, then restart iptables service. - PasswordAuthentication no - this requires an additional option to be change, "ChallengeResponseAuthentication no". Having made both of these changes, causes the login to abort is a valid ssh key is not specified. Again many thanks to everyone. _____ From: Karl Kobata [mailto:Karl.Kobata@syncira.com] Sent: Tuesday, September 22, 2009 11:02 AM To: 'centos(a)centos.org' Subject: sshd options - centos 5.3 I have installed cento 5.3. I enabled the ssh deamon. I have found that 2 options that I normally use does respond as I expect. Has anyone else had similar problems with the following options in sshd_config: - Port 6666 - if I set the port to anything other than 22 (default), using ssh -p6666 name@servername, does not work. Yet if I leave keep the default, then ssh name@servername allows me to login. - PasswordAuthentication no - if I set this option to "no" (default is "yes"), and my ssh key is either missing or in error, I will be prompted for user system login password. If this is set to "no", it should not allow me to login if I have not ssh key specified or in error. Has anyone else run into this problem. Is there a workaround? What are my options? Please help.

1 0

about ntpq result..
by MontyRee 23 Sep '09

23 Sep '09

Hello, all. I want to ask some about ntpd. I set 'server' directive like below at ntp.conf server 0.centos.pool.ntp.org For example, I can see the ntpq result like below. remote refid st t when poll reach delay offset jitter ============================================================================== * 10.10.23.44 211.115.xx.xx 3 u 62 64 1 1.892 -3.882 0.001 if 0.centos.pool.ntp.org has multiple ip address 10.10.23.44 and 10.10.23.45, and after some time 10.10.23.44 goes down, courrent configuration(10.10.23.44) will be changed to 10.10.23.45 automatically or not without restarting ntpd? Surely, I know that I can set multiple domains like below. But let's assume that just set one domain. server 1.centos.pool.ntp.org server 2.centos.pool.ntp.org Thanks in advance. _________________________________________________________________ 클릭 한번으로 전세계 이미지가 검색됩니다. 지금 라이브 검색을 체험해보세요. http://www.live.com/?scope=images

2 1

Promlem with broken yum/rpm
by Peter Beck 23 Sep '09

23 Sep '09

Hi all, I have lost/corrupted the libraries related to the expat package. This has caused rpm and yum to stop working effectively stopping my ability to manage my server. Recently a bug was reported by cmisare on the CentOS site that had exactly the same symptoms http://bugs.centos.org/view.php?id=3757 Btw rpm crashes with exactly the same message. I was hoping that cmisare, or someone else on this list, may be able to explain to me how he/she managed to get yum working again, as must be the case as it crashes in the first post but is working in the second post. Any help would be very much appreciated. Peter

2 1

installonlypkgs vs. exclude in yum.conf
by Michael Nausch 23 Sep '09

23 Sep '09

HI, with "exclude" in yum.conf I can exclude kernel-updates via: exclude=kernel* If I use installonlypkgs, what happend exactly? Like: installonlypkgs=kernel kernel-smp kernel-devel kernel-smp-devel kernel-largesmp kernel-largesmp-devel kernel-hugemem kernel-hugemem-devel What's the difference betwenn update and installonly? Thanx! ttyl, Django -- "Bonnie & Clyde der Postmaster-Szene!" approved by Postfix-God http://wetterstation-pliening.info http://dokuwiki.nausch.org

2 1

MySQL setup: initial user weirdness
by Niki Kovacs 22 Sep '09

22 Sep '09

Hi, I've always been a bit puzzled by MySQL's initial setup. Right after installing MySQL, no password is set, so that's the first thing I care about. I know there's a way to do that with mysqldadmin, but hey, different ways lead to Saint-Bauzille-de-Montmel. # chkconfig mysqld on # service mysqld start # mysql -u root mysql> use mysql; mysql> select user, host, password from user; +------+-----------+----------+ | user | host | password | +------+-----------+----------+ | root | localhost | | | root | buildbox | | | root | 127.0.0.1 | | | | localhost | | | | buildbox | | +------+-----------+----------+ 5 rows in set (0.00 sec) This shows that in my initial setup, I have no less than five initial users. A root user for three different hosts (localhost, buildbox and 127.0.0.1), and an empty user for two different hosts (localhost and buildbox). I don't know if I'm expected to set five passwords (five times the same? five different passwords?) for these five entities, but what I usually do is just get rid of every initial user except root@localhost. In that case: mysql> delete from user where user = ''; Query OK, 2 rows affected (0.01 sec) mysql> select user, host, password from user; +------+-----------+----------+ | user | host | password | +------+-----------+----------+ | root | localhost | | | root | buildbox | | | root | 127.0.0.1 | | +------+-----------+----------+ 3 rows in set (0.00 sec) Here goes the empty user. Now for the remaining two: mysql> delete from user where host = 'buildbox'; Query OK, 1 row affected (0.01 sec) mysql> delete from user where host = '127.0.0.1'; Query OK, 1 row affected (0.00 sec) Which leaves me with only root@localhost: mysql> select user, host, password from user; +------+-----------+----------+ | user | host | password | +------+-----------+----------+ | root | localhost | | +------+-----------+----------+ 1 row in set (0.00 sec) And now I can define a password for that single initial user: mysql> set password for root@localhost = password('my_secret_password'); mysql> select user, host, password from user; +------+-----------+------------------+ | user | host | password | +------+-----------+------------------+ | root | localhost | 2d97271970b60f82 | +------+-----------+------------------+ 1 row in set (0.00 sec) mysql> quit; And from now on, I can safely connect to the MySQL monitor using mysql -u root -p. I've done things like this for the past two or three years, and just now I wonder: am I doing something silly here? After all, maybe these other initial users have some obscure reason to be there in the first place? So I thought: why not ask? Niki

2 3

installing 5.3 with 512M ram really slow
by Jerry Geis 22 Sep '09

22 Sep '09

I was installing centos 5.3 x86_64 on a sempron 2.7G machine with 512M ram. The install started off fine then REALLY SLOWED down about 70% into install. I did have a swap space. after that it just crawled. I tried restart the install a couple times at 512M. Same thing around 70% the slow down. I then put in 1G of RAM and everything zipped on past and finished fine. Does 5.3 have minimum installation RAM requirements? I had not noticed. Does the same apply for running? 5.2 did not seem to have any issues running in 512M that I recall. Thanks for your comments. jerry

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sshd options - centos 5.3
by Karl Kobata 22 Sep '09

22 Sep '09

I have installed cento 5.3. I enabled the ssh deamon. I have found that 2 options that I normally use does respond as I expect. Has anyone else had similar problems with the following options in sshd_config: - Port 6666 - if I set the port to anything other than 22 (default), using ssh -p6666 name@servername, does not work. Yet if I leave keep the default, then ssh name@servername allows me to login. - PasswordAuthentication no - if I set this option to "no" (default is "yes"), and my ssh key is either missing or in error, I will be prompted for user system login password. If this is set to "no", it should not allow me to login if I have not ssh key specified or in error. Has anyone else run into this problem. Is there a workaround? What are my options? Please help.

4 3

Re: [CentOS] sshd options - centos 5.3
by Karl Kobata 22 Sep '09

22 Sep '09

Hi Michel, > Hi, > On Tue, 2009-09-22 at 11:01 -0700, Karl Kobata wrote: > > I have installed cento 5.3. I enabled the ssh deamon. I have found > > that 2 options that I normally use does respond as I expect. Has > > anyone else had similar problems with the following options in > > sshd_config: > > > > - Port 6666 - if I set the port to anything other than 22 (default), > > using ssh -p6666 name at servername <http://lists.centos.org/mailman/listinfo/centos> , does not work. Yet if I leave keep > > the default, then ssh name at servername <http://lists.centos.org/mailman/listinfo/centos> allows me to login. > Did you check your iptables rules ? port 6666 is closed by default. I > use a sshd with port 443, so it should work. Was this the only change you made to change the port? Did you also makes changes in iptables? > > > > - PasswordAuthentication no - if I set this option to "no" (default is > > "yes"), and my ssh key is either missing or in error, I will be > > prompted for user system login password. If this is set to "no", it > > should not allow me to login if I have not ssh key specified or in > > error. Has anyone else run into this problem. > Erhm.. I remember it does ask for a password but just doesn't let you > in. But I can me mistaken :) It does ask you for a password, and if you entered your user system password, It will log you in. I am surprised that this failure exists. > > Regards, > > Michel

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Discuss September 2009