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Question about rebooting and iptables rules persisting
by Preston Crawford 27 Mar '07

27 Mar '07

So I use Samba on my home network. I open the samba ports in the GUI tool for CentOS 4. Here is the problem. Every time I reboot I'm forced to run system-config-securitylevel to get firewall ports open again. So like if I reboot samba won't work. I go into that tool either via command line or via the GUI and I simply click "ok" and samba is suddenly open. Does anyone know what is happening? I've tried iptables -save or whatever. Nothing seems to work in getting these ports to be open on reboot. Preston

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Re: [CentOS] Tape drive recommendations
by Mookie Kong 27 Mar '07

27 Mar '07

I've been using AIT for a while now and have had no problems with it. AIT-4 would suit you well with its 200GB native capacity. All SCSI drives should be supported well in CentOS.

1 0

Zenoss on Cent 5
by Sean Brown 27 Mar '07

27 Mar '07

Has anyone tried getting Zenoss (zenoss.com) built and running on Cent 5? I'm having the damndest time getting the src.rpm to build. Thanks

2 1

Performance problem with CentOs 4.4 Samba
by "Petr \"Qaxi\" Klíma" 27 Mar '07

27 Mar '07

Hello I experience performance problem with CentOs 4.4 Samba 3.0 Reading files from Samba (1 client WinXP) is 3 times slower than writing to samba. What should I look at? OS je CentOS 4.4 (RHEL 4 U4) # smbd --version Version 3.0.10-1.4E.11 CFG ================================================================== # cat /etc/samba/smb.conf [global] workgroup = GROUP netbios name = SERVER server string = Samba Server passwd program = /usr/bin/passwd %u passwd chat = *New*Password* %n\n*Re-enter*new*password* %n\n *Password*changed* passwd chat debug = no pam password change = yes unix password sync = yes username map = /etc/samba/smbusers log level = 1 syslog = 0 interfaces = eth0, lo bind interfaces only = yes name resolve order = wins host bcast printcap name = CUPS show add printer wizard = No add user script = /usr/sbin/useradd -g users -m '%u' delete user script = /usr/sbin/userdel -r '%u' add group script = /usr/sbin/groupadd '%g' delete group script = /usr/sbin/groupdel '%g' add user to group script = /usr/sbin/usermod -a -G '%g' '%u' add machine script = /usr/sbin/useradd -s /bin/false -d /var/lib/nobody '%u' logon script = scripts\login.bat logon path = logon drive = H: domain logons = Yes preferred master = Yes wins support = Yes printing = CUPS [homes] comment = Home Directories valid users = %S read only = No browseable = No [public] comment = Public Store path = /data/public only guest = yes writable = yes create mask = 0770 directory mask = 0770 [GRP1] comment = Accounting Files path = /data/ucetni #valid users = %G valid users = @GRP1 read only = No create mask = 0770 directory mask = 0770 ================================================================== # rpm -qa | grep samba samba-common-3.0.10-1.4E.11 samba-client-3.0.10-1.4E.11 samba-3.0.10-1.4E.11 -- Petr Klíma e-mail: qaxi(a)seznam.cz

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network redundancy via two nics, two routers?
by Jeff Potter 27 Mar '07

27 Mar '07

Hi List, I'm trying to configure two switches to provide redundancy (i.e. in case one switch goes down), and am wondering if there is a standard way to configure a CentOS box to use different gateways in a bonded interface, depending upon which physical nic is being used? A bit more detail might help answer the "And why do you want to do that?" questions... - Switch 1, Port 1: has an uplink to upstream provider, and is in VLAN-1 - Switch 2, Port 1: has a 2nd uplink to upstream provider, and is in VLAN-1 - Switch 1, Port 25+26 are trunked (link aggregation; depends on your terminology; these are procurve 2600's) and connected to Switch 2, Port 25+26. All vlans configured run on the trunked link, with tagging. - Uplinks to provider are running HSRP. Upstream provider creates a virtual IP (say, 2.2.2.1) that is the gateway to the outside world on one of the links, randomly. - Server A is connected to Switch 1, Port 2 on eth0; and Switch 2, Port 2 on eth1. Server is assigned an IP address, say, 1.1.1.2, inside VLAN-2 (1.1.1.0/24) - Server B, C, etc. exist in different VLANs. (Just saying this so as to avoid the suggestion of "don't use vlans" because that would make this mess go away, but create a security problem.) - Switch 1 does light routing. For VLAN-2, it is listening on, say, 1.1.1.254. - Switch 2 also does light routing. For VLAN-2, it is listening on, say, 1.1.1.253. So, Server A's eth0 should use 1.1.1.254 as its gateway; and Server A's eth1 should use 1.1.1.253 as its gateway. The HSRP link will create 2.2.2.1 and an associated MAC address on one of its links; the two switches will throw the packets to the HSRP link on the correct switch. It doesn't matter which router (1.1.1.254 of 1.1.1.253) is used, since they will both route packets to the appropriate VLAN. If one of the switches goes down, the surviving HSRP link will claim the virtual IP (2.2.2.1) and the switch will receive an arp to let it know to update its arp table. (I've also set mac and arp timeouts to 1 minute.) So, the question remains... is there a way to tell linux that, given a bonded interface, the gateway for one physical nic is X while for a second physical nic it is Y? (Bonding can be active/standby.) (If I had tons of $'s; I would just go buy some Cisco gear that's capable of creating a virtual chassis and be done with this. I don't have tons of $'s. If there are other ways of configuring this; I'd love to know; but from everything I can gather, passing the various VLAN traffic between the two switches (via tagged-VLANs on the interswitch connection) seems the only viable solution. Or should I really be looking at XRRP? Or Stacking? But that's a different list...) How do people normally do this? (This seems too complicated to be right.) best, Jeff

4 5

Complex sendmail alias handling.
by Hugh E Cruickshank 27 Mar '07

27 Mar '07

Hi all: I have a situation where I need to change the distribution of emails for selected accounts on a regular basis. This is for the controlling of the distribution of our "support" email address. In the past I just created a "alias.bas" file to hold the bulk of our aliases and then 3 "support" alias files, alias.wkd, alias.evn and alias.wed (for weekday, evening and weekend day distribution lists) and then used crontab entries to cat the base file and one of the "support" files into the alias file and run newaliases. This worked fine while everyone was working on an 0800-1600 schedule but now we have one person that will be working on an 0600-1800 schedule a few days per week. This is going really muck up my simple little procedures. I was wondering if anyone out there new of something short of an automatic email receiving and routing package (which I have not done any research on) that might fit my simple requirements. Failing that can anyone recommend an automatic email receiving and routing package that is not to difficult to setup? TIA Regards, Hugh -- Hugh E Cruickshank, Forward Software, www.forward-software.com

9 24

scsi drive assignment problem
by James Fidell 27 Mar '07

27 Mar '07

I have a server which may or may not have a USB storage device connected when it boots. It also attaches to a disk array with a number of logical disks using ISCSI. When booted with the USB device present, that is attached to /dev/sdb and the ISCSI disks are attached to /dev/sdc up. If the USB device is not present, then the ISCSI disks are attached to /dev/sdb onwards. Is there a way to force the USB device not to be attached at all, or to delay it until after the ISCSI disks have been attached so that I get a predictable assignment of device names to the ISCSI disks? James

2 2

DISAATER RECOVERY PROBLEM
by Chris Geldenhuis 27 Mar '07

27 Mar '07

Hi Guys, I am trying to set up a quick disaster recovery methodology for a client. It is supposed to work as follows:- All Data files , everything in /etc (except for a few hardware specific files such as fstab), all users .bashrc and .netrc files, all cron tables etc. is written to a DVD as a zipped tar file. A recovery script that unpacks this file, creates any directories required by the application that are not backed up etc. is also written to the DVD. The DVD is then mounted on a freshly installed system (Centos4.4 at present) and the restore script is run. This restors all the saved files on the DVD to their original positions and creates empty directories where required for the application to run. The recovery system is then rebooted and the differences in hardware are taken care of by "kudzu" removing hw that was present on the "old" system and installing hardware present on the "new" system - typically network cards, usb controllers, scsi controllers, IDE controllers and graphics cards. All of the above works perfectly. However when I then log in to the recovered system as a user via ssh, or directly on a tty (non-gui), the login process does not execute the instructions in the user's .bashrc file and I get a shell prompt with none of the required environmental variables set - also the last line in the .bashrc is an exec of a script that bring up the application - this does not happen. When I log in to the gui desktop as the user and then open a terminal screen the instructions in the .bashrc do get executed and the application runs as it should. Any ideas of where to look ? TIA Chris Geldenhuis

5 8

Building a UML image of CentOS 4.4
by Stephen Harris 27 Mar '07

27 Mar '07

I'm wondering what the best way of building a UML image is; I tried the following based on documents I found on the web for FC2 mkdir -p $T/etc $T/dev $T/proc $T/sys $T/var/tmp $T/var/cache/yum \ $T/var/lock/rpm $T/var/cache/yum/update/headers \ $T/var/cache/yum/update/packages touch $T/etc/fstab mknod $T/dev/null c 1 3 chmod 666 $T/dev/null mount --bind /proc $T/proc mount --bind /sys $T/sys rpm --root $T -Uvh --nodeps --force $UML/RPM/centos-release-4-4.2.i386.rpm \ $UML/RPM/yum-2.4.3-1.c4.noarch.rpm yum -y -C --installroot=$T groupinstall "Base" ($T is a temp directory; $UML is where I'm storing my software) Unfortunately yum fails to run, complaining about repomd.xml files being missing. + rpm --root /var/tmp/bld.13824 -Uvh --nodeps --force /usr/local/uml/RPM/centos-release-4-4.2.i386.rpm /usr/local/uml/RPM/yum-2.4.3-1.c4.noarch.rpm warning: /usr/local/uml/RPM/centos-release-4-4.2.i386.rpm: V3 DSA signature: NOKEY, key ID 443e1821 Preparing... ########################################### [100%] 1:yum ########################################### [ 50%] error: %post(yum-2.4.3-1.c4.noarch) scriptlet failed, exit status 255 2:centos-release ########################################### [100%] + yum -y -C --installroot=/var/tmp/bld.13824 groupinstall Base Setting up Group Process Setting up repositories Cannot open/read repomd.xml file for repository: update Cannot find repomd.xml file for update Error: Cannot find repomd.xml file for update (The yum rpm install problem is because chkconfig doesn't exist; not a problem.) Any ideas? -- rgds Stephen

3 4

Problems with LDAP
by Mário Gamito 27 Mar '07

27 Mar '07

Hi, I'm making a schema for my company's co-workers, but i'm obviosuly doing something wrong, because i get: ldapadd -x -D "cn=admin,dc=telbit,dc=pt" -w secret -f people.ldif adding new entry "dc=telbit,dc=pt" ldapadd: no attributes to change or add (entry="cn=admin,dc=telbit,dc=pt") My schema file (experimantel) is: ## objectclass definition for 'plainjoePerson' depends on core.schema. objectclass ( 1.3.6.1.4.1.7165.1.1.1.1 NAME 'msnMSN' SUP person STRUCTURAL MUST (mail) ) My lddif follows my signature. Any help would be appreciated. Warm Regards -- :wq! Mário Gamito -- dn: dc=telbit,dc=pt objectClass: top objectClass: dcObject objectClass: organization o: telbit.pt dc: telbit dn: cn=admin,dc=telbit,dc=pt objectClass: organizationalRole cn: admin description: LDAP administrator userPassword:: e2NyeXB0fVQ3cnZKWVBXMGJCVnM= dn: ou=accounts,dc=telbit,dc=pt objectClass: top objectClass: organizationalUnit ou: accounts description: Users dn: uid=mgamito,ou=accounts,dc=telbit,dc=pt objectClass: top objectClass: person objectClass: inetOrgPerson objectClass: qmailUser o: Telbit uid: mgamito homeDirectory: /var/qmail/maildirs/mgamito(a)telbit.pt mailAlternateAddress: mgamito(a)mail.telbit.pt mailAlternateAddress: mgamito(a)metropolis.telbit.pt mailQuotaSize: 1073741824 sn: Gamito mail: mgamito(a)telbit.pt userPassword:: e01ENX04WmhhakZFRldZRDNtUWpIOU1LcW5RPT0= structuralObjectClass: inetOrgPerson cn: Mario Gamito dn: ou=people,dc=telbit,dc=pt objectClass: top objectClass: inetOrgPerson ou: people description: People structuralObjectClass: organizationalUnit dn: mail=mgamito(a)telbit.pt,ou=users,ou=accounts,dc=telbit,dc=pt objectClass: top objectClass: person objectClass: inetOrgPerson objectClass: mail o: Telbit mail: mgamito(a)telbit.pt msnMSN: blabla(a)hotmail.com

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