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Using raid 1 for rollback purposes
by James Olin Oden 25 Oct '07

25 Oct '07

Hi All, For quite some time I've used raid 1 as a means of providing a rollback mechanism for an upgrade (which I learned from others long ago). So essentially, before an upgrade you split the mirrors and upgrade one side or the other. If your upgrade goes well you sync one way, if your upgrade does not you sync the other (much hand waving and chanting going on, as its more complicated than that, but that is the essence of the solution). Recently, I was asked to do the same thing but with a raid 1+0 solution. Its easy, enough to break the raid 1 volumes underneath, but then how do I use the broke off volumes to form the duplicate strip. Pictures may help. We start off looking like: /----------- Raid 0 Volume ----------\ | [disk 0]<---R 1--->[disk 2] | | | | [disk 1]<---R 1--->[disk 3] | \--------------------------------------------/ What we want to go to is: /--- Raid 0 ---\ /--- Raid 0 ---\ | [disk 0] | | [disk 2] | | | | | | [disk 1] | | [disk 3] | \-----------------/ \------------------/ Old System New System Is this possible with the current set of mdadm tools? Thanks...james

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apache mod_authnzldap against Active Directory
by David Nalley 25 Oct '07

25 Oct '07

Hey guys I am running CentOS 5 with httpd 2.2.3 I am trying to configure mod_authnzldap authing against Active Directory and I have it working about 50% of the time. About 50% of the time this works with no issue, the rest of the time it fails. Sometimes it fails and notes the following in the error log: [Mon Oct 22 15:58:03 2007] [debug] mod_authnz_ldap.c(373): [client 10.XXX.XX.XXX] [13379] auth_ldap authenticate: using URL ldap://10.XX.XX.XXX:389/DC=centos,DC=org?sAMAccountName?sub?(objectClass=*) [Mon Oct 22 15:58:03 2007] [warn] [client 10.xxx.xx.xxx] [13379] auth_ldap authenticate: user special authentication failed; URI /logo.gif [ldap_search_ext_s() for user failed][Operations error] Other times it printsthe following, but nothing after that (and CPU usage skyrockets to 100% of a single CPU) [Mon Oct 22 16:08:11 2007] [debug] mod_authnz_ldap.c(373): [client 10.XX.XXX.XX] [13437] auth_ldap authenticate: using URL ldap://10.XX.X.XXX:389/DC=centos,DC=org?sAMAccountName?sub?(objectClass=*) In capturing the packets I see that it binds successfully several times and then tries to authenticate. The AD box returns: LDAPMessage searchResDone(5) operationsError (00000000: LdapErr: DSID-0C090627, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, vece) [0 results] None of the binds that occur in the capture failed though. (all the bind responses reported success) The appropriate (anonymized) lines from httpd.conf are: <Location /logo.gif> # <--- change path as needed Order allow,deny Allow from all AuthBasicProvider ldap AuthType Basic AuthzLdapAuthoritative off AuthName "BackupPC login" AuthLDAPBindDN ldapb(a)centos.org AuthLDAPBindPassword myformerlysecretpasswordpostedtoworld AuthLDAPURL "ldap://10.XX.XX.XXX:389/DC=centos,DC=org?sAMAccountName?sub? (objectClass=*)" NONE require valid-user </Location> I have debug turned on. On startup I get: [root@backuppc httpd]# service httpd start Starting httpd: [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(849): [13375] auth_ldap url parse: `ldap://10.XX.X.XXX:389/DC=centos,DC=org?sAMAccountName?sub?(objectClass=*)' [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(858): [13375] auth_ldap url parse: Host: 10.XX.XX.XXX:389 [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(860): [13375] auth_ldap url parse: Port: 389 [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(862): [13375] auth_ldap url parse: DN: DC=centos,DC=org [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(864): [13375] auth_ldap url parse: attrib: sAMAccountName [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(866): [13375] auth_ldap url parse: scope: subtree [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(871): [13375] auth_ldap url parse: filter: (objectClass=*) [Mon Oct 22 15:53:31 2007] [debug] mod_authnz_ldap.c(951): LDAP: auth_ldap not using SSL connections [ OK ]

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fastcgi
by Centos 25 Oct '07

25 Oct '07

Hello is there any fastcgi rpm available. I downloaded fastcgi rpm from pbone.net, but it does not contain mod_fastcgi.so what about srpm ? http://rpm.pbone.net/index.php3/stat/4/idpl/612033/com/mod_fastcgi-2.4.0-1.… thanks for help

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DNS CNAME question
by Rogelio 25 Oct '07

25 Oct '07

Not sure if this is the best place to ask this question (and if so, please point me to a better listserv), but is there anything "wrong" RFC or best practice wise with pointing a CNAME record to a DNS server? (I'm using EveryDNS.net, and I'd like to make my CNAME records ns1-> 4.myDomain.com correspond to ns1->ns4.EveryDNS.net.)

4 3

mirroring kbsingh repos
by James A. Peltier 25 Oct '07

25 Oct '07

Hi All, I'm trying to find out the best way to mirror the kbsingh repositories because most of my machines do not have access to the outside world. What is the best way to do this. I want extras and misc for both el4 and el5 all arches. -- James A. Peltier Technical Director, RHCE SCIRF | GrUVi @ Simon Fraser University - Burnaby Campus Phone : 778-782-3610 Fax : 778-782-3045 Mobile : 778-840-6434 E-Mail : jpeltier(a)cs.sfu.ca Website : http://gruvi.cs.sfu.ca | http://scirf.cs.sfu.ca MSN : subatomic_spam(a)hotmail.com

2 3

nscd problem
by James A. Peltier 25 Oct '07

25 Oct '07

Hi All, I just enabled nscd to see if I can speed up some operations on our large NFS/NIS environment, however, now that I've enabled nscd I am no longer able to sudo. Can someone please point me in the right direction? Everything was working fine prior to enabling it. -- James A. Peltier Technical Director, RHCE SCIRF | GrUVi @ Simon Fraser University - Burnaby Campus Phone : 778-782-3610 Fax : 778-782-3045 Mobile : 778-840-6434 E-Mail : jpeltier(a)cs.sfu.ca Website : http://gruvi.cs.sfu.ca | http://scirf.cs.sfu.ca MSN : subatomic_spam(a)hotmail.com

2 3

Cronjob script with date stamp?
by Scott Ehrlich 25 Oct '07

25 Oct '07

I have a cron job that calls a shell script - the script invokes dump. I'd like to do two things: - Have the script dump the results of the job to a text file. I tried this with /path/to/dump my switches -v >> /home/me/dump.log But that just produced an empty file. - Have the dump file be date-stamped with the date it was executed. Right now, I manually edit the script to change the filename to the date the dump will be taken. To get a differential dump, would I have dump produce its output to the same file each time? I would not want to overwright the existing contents. I'm currently dumping to a file on an external hard drive, but will eventually go to tape. Thanks for feedback. Scott

3 2

Migrate CentOS 3 to 4 to 5?
by David Christopher Zentgraf 25 Oct '07

25 Oct '07

Hi, After the previous debacle with PHP and MySQL it has been decided that we think about an upgrade from CentOS 3 to 5, since that would solve our problem, if successful. I tried finding information on how to best attempt this, but thanks to a plethora of contradictory information my head is now spinning with a few rpm (rounds per minute). The situation is as follows: Remote box at our host who offers CentOS 3 as the most up-to-date OS, unless you pay them an unholy amount of money for RHEL or Windows licences. Popping in a CD for an upgrade does not work for us. We can and will have the OS restored to a clean post-install state prior to updating. I have little intimate knowledge with CentOS, RPMs or yum, but general good UNIX experience. I know "live" yum migrations are greatly discouraged, but it seems to work for people. The most detailed instructions I seemed to be able to find are here: http://www.centos.org/modules/newbb/viewtopic.php?topic_id=382 Can anybody confirm this to work, is there anything else that's implied but not spelled out? Another, differing approach seems to be this: http:// levine.sscnet.ucla.edu/general/software/tc1000/rmredhat.htm Any ideas about it? Any hints, or rather detailed steps, would be greatly appreciated. Chrs, Dav

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Re: CentOS-5.0-x86_64-bin-DVD-ich9.iso.delta md5 mismatch
by Michael Rock 25 Oct '07

25 Oct '07

David wrote: >I'll test DVD tomorrow. Today new kernel RPMS are > being built. What ptions are you talking about? > David all-generic-ide irqpoll Without irqpoll it just hangs and without all-generic-ide it get a kernel panic. So I still need both to recognize the disk and continue booting. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

2 1

dovecot fails to start at boot, but starts manually
by Kenneth Porter 25 Oct '07

25 Oct '07

dovecot-1.0-1.2.rc15.el5 on CentOS 5 I reboot the server and dovecot fails to start. But I can then issue "service dovecot start" and it starts up just fine. How to debug? I don't see anything in /var/log/messages nor /var/log/maillog. I did have to set SELinux to permissive (in /etc/selinux/config), as dovecot can't get at its SSL certs. I'm debugging that independently. (SELinux is also disabled for clamav, another item to debug.)

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