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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

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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

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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

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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.

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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

2 1

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

22 Sep '09

Hi Larry, > On Tue, Sep 22, 2009 at 1:01 PM, Karl Kobata <Karl.Kobata at syncira.com <http://lists.centos.org/mailman/listinfo/centos> > wrote: > > - 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. > You need to change the port in iptables as well. How do I modify the iptables? thanks

2 1

Question about iostat output
by Pascal Robert 22 Sep '09

22 Sep '09

Hello, We are planning to moving most of our servers to ESX but before buying our SAN, we want to do some I/O stats to see if iSCSI is enough or if we have to go with FC. So I found a plugin for Nagios that can log I/O stats with iostat. So far it's fine with single disk/one partition servers, but on our Oracle Database 10g server, we have two drives in RAID 1 (/dev/sda) and 4 other drives in RAID 10 (/dev/sdb). When I query iostat, I get : [root@golgoth ~]# iostat Linux 2.6.9-55.ELsmp (golgoth.acaiq-ctb.lan) 09/21/2009 avg-cpu: %user %nice %sys %iowait %idle 1.83 0.00 3.04 0.79 94.34 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 8.44 12.25 32.40 489731534 1295151278 sda1 0.00 0.00 0.00 21360 7478 sda2 6.60 80.90 44.41 3234128950 1775185432 sda3 0.05 0.20 0.23 7852212 9358056 sda4 0.00 0.00 0.00 2 0 sda5 41.16 38.59 95.20 1542695170 3805566528 sdb 2.84 72.63 28.91 2903208392 1155519494 sdb1 3.67 77.14 23.90 3083762026 955474128 sdb2 1.62 102.92 5.00 4114412086 200045262 So why sda have a lower TPS and bytes read/write than one of it's partitions (sda5, which is the root partition)? I guess I would have to collect the stats for each partitions to get what the total?

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Xnest unable to connect with firewall enabled
by Sid Kapoor 22 Sep '09

22 Sep '09

Hi all, I have worked on both CentOS 5.2 and CentOS 5.3. In CentOS 5.2, I could connect to a remote X-server using Xnest binary provided by the package xorg-x11-server-Xnest-1.1.1-48.41.el5 with firewall settings enabled. I enabled the firewall settings from system-config-securitylevel. Now in CentOS 5.3 with firewall settings enabled, I am unable to connect to the remote X-server using Xnest (xorg-x11-server-Xnest-1.1.1-48.52.el5). To successfully connect, I have to either disable firewall settings or filter the TCP ports on which Xnest connects to the remote server. Is there an issue regarding firewall settings in CentOS 5.3 ? I want to connect to the remote X-server without disabling the firewall settings. How is possible ? Thanks in advance. Siddharth

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dhcpd logging to dhcpd.log only
by Dan Carl 22 Sep '09

22 Sep '09

I've added this to my dhcpd.conf log-facility local6; and added this to my syslog.conf local6.* /var/log/dhcpd.log It's still writing to dhcpd info to both log files. How do I stop this. I've googled but all suggested modifications I've made to the dhcpd.conf causes dhcpd to not start. Thanks Dan

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