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34753 discussions

Nfs v4 only - how to disable nfs v3?
by Olaf Mueller 03 Mar '09

03 Mar '09

Hello, I have nfs version 4 running on a CentOS 5.2 server to export /home. That works great so for, but clients can mount /home with nfs version 3 too. How can I disable nfs v3 on the server? Thank you Olaf

2 1

Best CentOS to install on *old* laptop?
by Bart Schaefer 03 Mar '09

03 Mar '09

I've found an old IBM OmniBook 800 and am curious whether I can get it going again. (Currently it boots either Windows 95 or some then-contemporary version of Slackware.) The CDROM is external (SCSI, I think) and the machine won't boot from it, so it'd require a boot floppy. Any suggestions? Or is CentOS entirely the wrong Linux to be thinking about for this?

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Deleting Large Files
by Joseph L. Casale 03 Mar '09

03 Mar '09

I have an issue with a busy CentOS server exporting iSCSI and NFS/SMB shares. Some of the files are very large, and when they get deleted IO climbs to an unacceptable rate. Is there a way to purge a file with little to no IO overhead on ext3? Thanks! jlc

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cups & hp-toolbox
by Roger Wells 02 Mar '09

02 Mar '09

Hello, I installed a printer (HP LaserJet 4350n) via CUPS Web Interface. Following this when I run hp-toolbox a dialog claiming that "No Installed HP Devices Found" is displayed. This is true even when I am the root user. This worked as expected on RHEL4 on the same computer (Thinkpad X31) with the same printer. Any thoughts will be appreciated. Thanks, roger wells -- Roger Wells, P.E. SAIC 221 Third St Newport, RI 02840 401-847-4210 (voice) 401-849-1585 (fax) roger.k.wells(a)saic.com

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Cannot open port 631 for Cups printer sharing
by b.j. mcclure 02 Mar '09

02 Mar '09

I have been trying to set up printer sharing on the LAN.All machines are CentOS 5.2 fully updated. The problem server is a fresh build. The box it is replacing worked fine for many months. The problem appears to be a closed port 631 on the new box. iptables and ip6tables are stopped as shown by the output below. To confirm I was using nmap correctly I ran it against the old server first which shows 631 open. No matter what I do to the new box (192.168.2.205) 631 remains closed. I was running it on the new box via ssh which I think eleminates any swithc/router issues. Any thoughts gladly accepted. This must be something simple/stupid I have overlooked. Not much hair left to pull out. ;-/ B.J. [root@office bmcclure]# ssh 192.168.2.200 root(a)192.168.2.200's password: Last login: Sat Feb 21 17:39:51 2009 [root@fileserver ~]# nmap -sT -p 631 -PT 192.168.2.200 Starting Nmap 4.20 ( http://insecure.org ) at 2009-03-02 11:00 EST Interesting ports on 192.168.2.200: PORT STATE SERVICE 631/tcp open ipp Nmap finished: 1 IP address (1 host up) scanned in 0.121 seconds [root@fileserver ~]# nmap -sT -p 631 -PT 192.168.2.205 Starting Nmap 4.20 ( http://insecure.org ) at 2009-03-02 11:01 EST Interesting ports on 192.168.2.205: PORT STATE SERVICE 631/tcp closed ipp MAC Address: 00:17:31:EC:0B:2D (Asustek Computer) Nmap finished: 1 IP address (1 host up) scanned in 0.185 seconds [root@fileserver ~]# exit logout Connection to 192.168.2.200 closed. [root@office bmcclure]# ssh 192.168.2.205 root(a)192.168.2.205's password: Last login: Mon Mar 2 06:52:36 2009 from house.keepertoad.com [root@webserver ~]# service iptables stop [root@webserver ~]# service ip6tables stop [root@webserver ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination [root@webserver ~]# ip6tables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination [root@webserver ~]# nmap -sT -p 631 -PT 127.0.0.1 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2009-03-02 11:03 EST Interesting ports on localhost (127.0.0.1): PORT STATE SERVICE 631/tcp closed ipp Nmap finished: 1 IP address (1 host up) scanned in 0.031 seconds [root@webserver ~]# service cups status cupsd (pid 6941) is running... [root@webserver ~]# nmap -sT -F -PT 127.0.0.1 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2009-03-02 11:09 EST Interesting ports on localhost (127.0.0.1): Not shown: 1233 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind 443/tcp open https 636/tcp open ldapssl 2049/tcp open nfs Nmap finished: 1 IP address (1 host up) scanned in 0.077 seconds [root@webserver ~]# CentOS 5.2, Linux 2.6.18-92.1.22.el5 x86_64 10:54:59 up 17:48, 1 user, load average: 0.34, 0.23, 0.09

4 26

(a) WinPower RPM available? (b) where to install if use tar.gz file?
by Lanny Marcus 02 Mar '09

02 Mar '09

Two quick and simple questions; I want to install the "WinPower" software for my new UPS. On their web site, they have a tar.gz file available for download. I know the reasons for staying with RPM, if at all possible. I've Googled and Yahood for ""WinPower"+RPM+Linux and get hits, but no obvious RPM. I tried "yum install winpower" and the response was "no package winpower available" (rpmforge is one of the yum repositories I use, so it's not there, with that name). (a) Is an RPM available for it? (If so, where and what's the name?) (b) If I need to download the tar.gz file and install from that, it looks from their documentation that they install into /opt/MonitorSoftware Is it better to install into /usr/local or into /opt? What is the recommendation for a CentOS box, when installing non RPM software? Where best to install non RPM stuff? TIA!

7 32

Problems printer PS 1.1 vs. 1.3/1.4
by MHR 02 Mar '09

02 Mar '09

I just ran into a most interesting situation. I am running CentOS 5.2 (2.6.18-92.1.22.el5) x86_64 with all the latest updates. I recently converted a TIF to a PDF using tiff2pdf, and then tried to print the file. Now, this has worked for me many times in the past, so I wasn't expecting any trouble at all. Instead, my printer, a Brother 2140 laser printer, which has printed these kinds of PDF files before without any problems, began spitting out the PS text instead. I did some poking around and found out that the PDF created by tiff2pdf was format 1.1. Another file I printed a few moments later, which I had scanned in, was PDF format 1.4, and it printed fine, as did the test page from System->Administration->Printer. I fired up my VMWare Windows guest, used Adobe Photoshop Elements 2.0 (an old version), converted the TIF using that, and lo and behold, the PDF is now in format 1.4. That one printed just fine. I'm running Adobe Reader 7.0.8 (mainly because AR 8.x never integrated properly into my web browsers, and, more importantly, I could not find a way to make it scale PDFs to fit my printers properly), so that _might_ be part of it, but, as I said, I have done this numerous times in the past and NEVER had a problem with it. Until now. Any clues what could be the problem? Anyone had better luck with a newer version of AR? Thanks. mhr

1 0

TIME_WAITs...
by John Doe 02 Mar '09

02 Mar '09

Hi, I was asked to check some TIME_WAITs "problems" (my boss thinks there should almost never be any) and I bumped into something strange... All of our servers have apparently normal (in my opinion) 60s TIME_WAITs (even if it strangely caps around 14000 in my tests)... But one of them behaves differently (and my boss thinks it is the normal behavior). If I make 10000 rapid connections/selects/deconnections to mysql on this server, I get like 1 TW after around 3000, another TW around 6000 and another TW around 9000... That makes 3 TWs only. And they last 60 seconds... I am told this server was not really setup differently (no custom kernel). All servers are CentOS 5.2, kernels 2.6.18-92.1.[22|10].el5. I compared the values in sysctl.conf and /proc/sys/net/ipv4/* and nothing different. So, am I correct in thinking that seeing thousands TWs when there was a burst of thousands connections is normal? Any idea why so few TWs on this server? Any conf file I should check? # cat /proc/sys/net/ipv4/tcp_fin_timeout 60 # cat /proc/sys/net/ipv4/tcp_max_tw_buckets 180000 # cat /proc/sys/net/ipv4/tcp_tw_recycle 0 # cat /proc/sys/net/ipv4/tcp_tw_reuse 0 When I googled for it, many people were pointing to the tcp_fin_timeout value ... Is it really related to TWs? Thx, JD

3 5

liblber-2.3.so.0 is needed by (installed ) ............ on cent os 5.2
by Agnello George 02 Mar '09

02 Mar '09

Hi I am trying to upgrde out openldap ver 2.3 to the lastest version 2.4, howevre there is no rpm avaibale for 2.4 so i decide to create my own for centOS flavour 5.2 here is the part look of my spec file openldap.spec Summary: openldap Installer Name: openldap Version: 2.4 Release: 1 Vendor: net Solutions License: Commercial Group: ms6 BuildRoot: /usr/src/redhat/BUILD/openldap Provides: openldap AutoReq: no AutoReqProv: no %description This package contains the F-PROT Antivirus for Linux. %files /bin/ /bin/ldapexop /bin/ldapmodify /bin/ldappasswd /bin/ldapadd /bin/ldapmodrdn /bin/ldapdelete /bin/ldapsearch /bin/ldapcompare /bin/ldapwhoami /etc/openldap/ /etc/openldap/ldap.conf.default /etc/openldap/ldap.conf /usr/include/ /usr/include/lber_types.h /usr/include/ldap_schema.h /usr/include/ldap_features.h /usr/include/ldap_cdefs.h /usr/include/lber.h /usr/include/ldap.h /usr/include/slapi-plugin.h /usr/include/ldap_utf8.h /lib/ /lib/liblber-2.4.so.2 /lib/liblber.la /lib/libldap_r-2.4.so.2.1.0 /lib/libldap_r-2.4.so.2 /lib/libldap_r.so /lib/libldap_r.a /lib/libldap_r.la /lib/liblber.so /lib/liblber.a /lib/libldap.so /lib/libldap-2.4.so.2 /lib/liblber-2.4.so.2.1.0 /lib/libldap.a /lib/libldap-2.4.so.2.1.0 /lib/libldap.la . . /usr/share/man/man5/slapd-sock.5 /usr/share/man/man5/slapd.access.5 /usr/share/man/man5/slapd-relay.5 /usr/share/man/man5/slapd-meta.5 /usr/share/man/man5/slapo-syncprov.5 /usr/share/man/man5/slapd-hdb.5 /usr/share/man/man5/slapo-rwm.5 /usr/share/man/man5/slapd.plugin.5 /usr/share/man/man5/ldif.5 /usr/share/man/man5/slapd-monitor.5 /usr/share/man/man5/slapd-perl.5 %defattr(-, root, root) %post cd /lib ln -s libldap_r-2.4.so.2 libldap_r-2.4.so.2.1.0 ln -s libldap_r.so libldap_r-2.4.so.2.1.0 ln -s liblber.so liblber-2.4.so.2.1.0 ln -s libldap.so libldap-2.4.so.2.1.0 ln -s libldap-2.4.so.2 libldap-2.4.so.2.1.0 it runs perfecetly and creates the RPM for me in /usr/src/redhat/RPMS/i386/openldap-2.4-1.i386.rpm however when i try to upgards the rpm it give me dependencies .... [root@pune openldap]# rpm -Uvh /usr/src/redhat/RPMS/i386/openldap-2.4-1.i386.rpm error: Failed dependencies: liblber-2.3.so.0 is needed by (installed) apr-util-1.2.7-6.i386 liblber-2.3.so.0 is needed by (installed) openldap-devel-2.3.27-5.i386 liblber-2.3.so.0 is needed by (installed) httpd-2.2.3-6.el5.centos.1.i386 liblber-2.3.so.0 is needed by (installed) cyrus-sasl-2.1.22-4.i386 liblber-2.3.so.0 is needed by (installed) nss_ldap-253-3.i386 liblber-2.3.so.0 is needed by (installed) php-ldap-5.1.6-5.el5.i386 liblber-2.3.so.0 is needed by (installed) openldap-clients-2.3.27-5.i386 liblber-2.3.so.0 is needed by (installed) postfix-2.5.5-1.cdb.pcre.sasl2.spf.rhel5.i386 liblber-2.3.so.0 is needed by (installed) cyrus-imapd-2.3.13-4.i386 liblber-2.3.so.0 is needed by (installed) mod_perl-2.0.2-6.1.i386 liblber-2.3.so.0 is needed by (installed) squid-2.6.STABLE6-4.i386 libldap-2.3.so.0 is needed by (installed) libuser-0.54.7-2.el5.1.i386 libldap-2.3.so.0 is needed by (installed) apr-util-1.2.7-6.i386 libldap-2.3.so.0 is needed by (installed) openldap-devel-2.3.27-5.i386 libldap-2.3.so.0 is needed by (installed) httpd-2.2.3-6.el5.centos.1.i386 libldap-2.3.so.0 is needed by (installed) cyrus-sasl-2.1.22-4.i386 libldap-2.3.so.0 is needed by (installed) sudo-1.6.8p12-10.i386 these modules are already present in the lib directory .........../lib/liblber-2.3.so.0 ............. Can some one help me with this error Thnsk a million - Regards Agnello D'souza

3 5

PAM and vsftpd
by RobertH 02 Mar '09

02 Mar '09

i have been researching for alternatives. it is latest centos 4 (4.7) and uses vsftpd 2.01 started (again) investigating possible PAM or PAM module way... Q: is there a PAM way to control repeated crack retires on vsftpd? possibly something that can be done in /etc/pam.d/vsftpd i have been looking for a solution other than fail2ban and/or similar methods using hosts.allow and hosts.deny or iptables specifically, i am trying to stop repeated access to vsftpd after more than x attempts from the same ip address.... thanks in advance for any pointers.. - rh

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