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Documentation post 5.2
by Joe Keller 11 Jun '10

11 Jun '10

I went to the CentOS documentation page (http://www.centos.org/docs/5/) looking for some documentation on 5.5 but was surprised there is nothing there post-5.2. Is there another place I should be looking? Thanks, Joe

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PHP file upload limit
by Boris Epstein 11 Jun '10

11 Jun '10

Hi all, I am trying to run a web-based PHP application on a CentOS 5 32-bit machine that requires me to upload large files. The machine also happens to have little RAM (256MB). I have no problem setting my upload limit ( upload_max_filesize ) to 1 GB but for some reason 2 GB or above seems to be no go. Would anybody know why? Could it be one of the many 32-bit vs 64-bit issues? Thanks. Boris.

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software raid - better management advice needed
by aurfalien＠gmail.com 11 Jun '10

11 Jun '10

Hi, I've used mdadm for years now to manage software raids. The task of using fdisk to first create partitions on a spare drive sitting on a shelf (raid 0 were my 1st of 2 drives failed) is kind of bugging me now. After using fdisk to create the same partition layout on the new drive as is on the existing drive and then using mdadm to finish every thing up is a little tedious. Any one have an idea how to have a sort of hot plug were I just swap out the drive and it rebuilds? - aurf

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script question
by Jerry Geis 11 Jun '10

11 Jun '10

Hi all, in a script if I have: VERSION="3.2.0" I can do: echo jj-$VERSION-jj and get jj-3.2.0-jj however if I do: echo jj_$VERSION_jj I get jj_ How do I get the $VERSION to work with the underscores like the dashes do. Thanks, Jerry

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Monitor Network Traffic
by sadas sadas 11 Jun '10

11 Jun '10

What is the best way to monitor the total incoming / outcoming network traffic of CentOS server. I think that the solution is to monitor the network interfaces and to send SNMP packets to remote server. But is it possible? regards

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Service monitoring/"Monit"?
by Toralf Lund 11 Jun '10

11 Jun '10

Has anybody here tried the "Monit" utility (http://mmonit.com/monit/)? I need to set up some kind of "watchdog" functionality for a custom service otherwise started via init (i.e. via a script in /etc/init.d + rc*.d links managed by chkconfig) and it seems like this system may give me nearly what I want. However, something that concerns me about it, is that it appears to take full ownership of the services it monitors, and pretty much bypass the init system, in that once I've told monit to watch a process, it makes not difference if the associated service is enabled or not (via "chkconfig") , and there is no good way to fully stop the service, besides removing the Monit config or disabling Monit itself. (Or maybe I can use special "monit" commands, too, but that means precisely that Monit "owns" the service, which I somehow don't quite like.) What I'd really like, is to have my process watched and restarted if it goes a way, but only if it had already been started via "init" or through the "service" command, or possibly direct execution of the "init.d" script. This also means it should be restarted if it crashes or if is stopped via a direct "kill", but not after "service <name> stop" or similar. Which might mean it all boils down to checking if, and only if, the pid file for the service already exists. (Does that make any sense?) So, does anyone know if there is a way to convince Monit to do this for me? Or alternatively, is there a different tool that might do the job? And yes, I know it shouldn't be that hard to design a program/script/cron job to do it all for me, but I still think not having to maintain another software component would be nice... - Toralf This e-mail, including any attachments and response string, may contain proprietary information which is confidential and may be legally privileged. It is for the intended recipient only. If you are not the intended recipient or transmission error has misdirected this e-mail, please notify the author by return e-mail and delete this message and any attachment immediately. If you are not the intended recipient you must not use, disclose, distribute, forward, copy, print or rely on this e-mail in any way except as permitted by the author.

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DHCP/DNS server for LAN with mainly Windows clients : Outlook Express vs. Webmail problem
by Niki Kovacs 11 Jun '10

11 Jun '10

Hi, I recently setup a CentOS 5 file server for a small LAN consisting of 15 Windows XP clients. The LAN is eventually expected to migrate to Linux, at least some of the client machines. The previous setup made by a local Windows-only computer firm was an unhealthy mix of static and dynamic IP addresses with conflicting adresses, etc. First thing I undertook was clean up this mess by setting up a DHCP + local cache DNS server on the Linux machine. Now the curious problem I have: IP addresses are attributed correctly, people can surf on the internet all right. But the only thing they can't seem to do is send mail with Outlook or Outlook Express. I have to revert to the ISP's DNS, but so I lose the benefit of local DNS. And I don't have the slightest clue as to why that is so. Here's my setup, maybe one of the gurus on the list has an idea: 1) /etc/dhcpd.conf (the fixed addresses are attributed because the local printer has a page counting device that works with IP adresses): --8<--------------------------------------- ddns-update-style interim; authoritative; default-lease-time 86400; max-lease-time 86400; option broadcast-address 192.168.0.255; option subnet-mask 255.255.255.0; option routers 192.168.0.1; option domain-name-servers 192.168.0.2; option domain-name "regards.arles"; subnet 192.168.0.0 netmask 255.255.255.0 { range 192.168.0.100 192.168.0.150; } host poste1 { hardware ethernet 00:26:18:B7:D6:10; fixed-address 192.168.0.101; option host-name "poste1"; } host poste2 { hardware ethernet 00:24:81:69:A3:DE; fixed-address 192.168.0.102; option host-name "poste2"; } host poste3 { hardware ethernet 00:1B:FC:6F:66:2C; fixed-address 192.168.0.103; option host-name "poste3"; } ... --8<--------------------------------------- For setting up Bind, I used a "dummy" domain name, like I usually do in LAN's. For example, my home network is "presbytere.montpezat", the local town hall's network is "mairie.montpezat". The network here is "regards.arles". ("Regards" is the name of a local association, and "Arles" is the city in South France where it's located). 2) /etc/named.conf: --8<--------------------------------------- options { directory "/var/named"; listen-on { 127.0.0.1; 192.168.0.0/24; }; }; zone "." IN { type hint; file "named.root"; }; zone "localhost" IN { type master; file "zone.localhost"; allow-update { none; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "revp.127.0.0"; allow-update { none; }; }; zone "regards.arles" IN { type master; file "zone.arles.regards"; }; zone "0.168.192.in-addr.arpa" { type master; file "revp.192.168.0"; }; --8<--------------------------------------- 3) /var/named/named.root: --8<--------------------------------------- ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42704 ;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14 ;; QUESTION SECTION: ;. IN NS ;; ANSWER SECTION: . 106187 IN NS h.root-servers.net. . 106187 IN NS i.root-servers.net. . 106187 IN NS j.root-servers.net. . 106187 IN NS k.root-servers.net. . 106187 IN NS l.root-servers.net. . 106187 IN NS m.root-servers.net. . 106187 IN NS a.root-servers.net. . 106187 IN NS b.root-servers.net. . 106187 IN NS c.root-servers.net. . 106187 IN NS d.root-servers.net. . 106187 IN NS e.root-servers.net. . 106187 IN NS f.root-servers.net. . 106187 IN NS g.root-servers.net. ;; ADDITIONAL SECTION: a.root-servers.net. 401883 IN A 198.41.0.4 a.root-servers.net. 401883 IN AAAA 2001:503:ba3e::2:30 b.root-servers.net. 401883 IN A 192.228.79.201 c.root-servers.net. 401883 IN A 192.33.4.12 d.root-servers.net. 401883 IN A 128.8.10.90 e.root-servers.net. 401883 IN A 192.203.230.10 f.root-servers.net. 401883 IN A 192.5.5.241 f.root-servers.net. 401883 IN AAAA 2001:500:2f::f g.root-servers.net. 401883 IN A 192.112.36.4 h.root-servers.net. 401883 IN A 128.63.2.53 h.root-servers.net. 401883 IN AAAA 2001:500:1::803f:235 i.root-servers.net. 401883 IN A 192.36.148.17 j.root-servers.net. 192587 IN A 192.58.128.30 j.root-servers.net. 192587 IN AAAA 2001:503:c27::2:30 ;; Query time: 6 msec ;; SERVER: 192.168.1.252#53(192.168.1.252) ;; WHEN: Wed May 26 18:47:37 2010 ;; MSG SIZE rcvd: 500 --8<--------------------------------------- 4) /var/named/zone.localhost: --8<--------------------------------------- $TTL 1D $ORIGIN localhost. @ IN SOA @ root ( 0000002 ; Serial 8H ; Refresh 15M ; Retry 1W ; Expire 1D) ; Minimum TTL IN NS @ IN A 127.0.0.1 --8<--------------------------------------- 5) /var/named/revp.127.0.0: --8<--------------------------------------- $TTL 1D $ORIGIN 0.0.127.in-addr.arpa. @ IN SOA localhost. root.localhost. ( 0000002 ; Serial 8H ; Refresh 15M ; Retry 1W ; Expire 1D ) ; Minimum TTL IN NS localhost. 1 IN PTR localhost. --8<--------------------------------------- 6) /var/named/zone.arles.regards: --8<--------------------------------------- $ORIGIN regards.arles. $TTL 1D @ IN SOA ibmx225 hostmaster ( 0000003 ; Serial 8H ; Refresh 4H ; Retry 4W ; Expire 1D ) ; Minimum NS ibmx225 localhost A 127.0.0.1 poste1 A 192.168.0.101 poste2 A 192.168.0.102 poste3 A 192.168.0.103 poste4 A 192.168.0.104 poste5 A 192.168.0.105 poste6 A 192.168.0.106 poste7 A 192.168.0.107 poste8 A 192.168.0.108 poste9 A 192.168.0.109 poste10 A 192.168.0.110 poste11 A 192.168.0.111 poste12 A 192.168.0.112 poste13 A 192.168.0.113 poste14 A 192.168.0.114 --8<--------------------------------------- 7) /var/named/revp.192.168.0: --8<--------------------------------------- $ORIGIN 0.168.192.in-addr.arpa. $TTL 1D @ IN SOA ibmx225.regards.arles. contact.kikinovak.net ( 0000003 ; Serial 28800 ; Refresh 14400 ; Retry 2419200 ; Expire 86400 ; Minimum ) NS ibmx225.regards.arles. 101 PTR poste1.regards.arles. 102 PTR poste2.regards.arles. 103 PTR poste3.regards.arles. 104 PTR poste4.regards.arles. 105 PTR poste5.regards.arles. 106 PTR poste6.regards.arles. 107 PTR poste7.regards.arles. 108 PTR poste8.regards.arles. 109 PTR poste9.regards.arles. 110 PTR poste10.regards.arles. 111 PTR poste11.regards.arles. 112 PTR poste12.regards.arles. 113 PTR poste13.regards.arles. 114 PTR poste14.regards.arles. --8<--------------------------------------- Any suggestions? cheers from the sunny South of France, Niki

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operation on the client is slow when openldap servers are down
by XUFENG 11 Jun '10

11 Jun '10

  @import url( C:\Documents and Settings\Administrator\Local Settings\Temporary Internet Files\scrollbar.css ); Hi List,   OS: centos5.3 x86_64 OpenLDAP is installed using yum.   I find that when all the ldap servers are down and offline, the operations on the client is slow. When I try to do `ls` on the directories on the client as root, it waits there for some seconds.(root is not local account not via ldap) But when I power on the openldap servers, it is much better.   The configuration on the client:   [root(a)xxxx ~]# cat /etc/ldap.conf  base dc=xxxx,dc=com timelimit 1 bind_timelimit 1 nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus,radvd,tomcat,radiusd,news,mailman,nscd,gdm uri ldaps://auth1.xa.xxxx.com:636 ldaps://auth2.xa.xxxx.com:636 ssl on tls_checkpeer yes tls_cacertdir /etc/openldap/cacerts tls_cacertfile /etc/openldap/cacerts/cacert.pem pam_password md5 bind_policy soft   [root(a)xxxx ~]# cat /etc/openldap/ldap.conf  URI ldaps://auth1.xa.xxxx.com:636 ldaps://auth2.xa.xxxx.com:636 BASE dc=xxxx,dc=com TLS_CACERTDIR /etc/openldap/cacerts TLS_CACERT /etc/openldap/cacerts/cacert.pem TLS_REQCERT demand   [root(a)xxxx ~]# cat /etc/nsswitch.conf  passwd:     files ldap shadow:     files ldap group:      files ldap hosts:      files dns bootparams: nisplus [NOTFOUND=return] files ethers:     files netmasks:   files networks:   files protocols:  files rpc:        files services:   files netgroup:   files ldap publickey:  nisplus automount:  files ldap aliases:    files nisplus     Any suggestions?

3 2

md0 and moving to another system
by aurfalien＠gmail.com 11 Jun '10

11 Jun '10

Hi all, I thought to have tested this a while ago but I guess not. I have a Centos 5.3 system (call its SYSA) software raid 0, 2 disks. I have an identical system (SYSB) else were, so I pull one of my mirrors drives from SYSA and put it in SYSB as the only drive in SYSB. Upon but I get grub error. I boot in recuse mode (CD, linux rescue) and it attempts to mount the disk, but claims no partitions exists. I drop into a shell and mount it w/o issues. Running fdisk on the drive tells me its got 2 partitions which is true. I set this up as ext3, no LVMs, etc... with root and the other partition being swap. I've always thought that all I can do in the event of motherboard failure os to have a duplicate system around and merely move a dive off to it. - aurf

2 2

Kickstart issue: 'dialog' doesn't work in %post, CentOS 5.5
by Zhang Huangbin 10 Jun '10

10 Jun '10

Hi, all. I'm trying to customize a CentOS installation cd, but got trouble with kickstart. I want to use dialog[1] for command line based user interface, but it can't display correctly in kickstart with CentOS 5.5. Same ks file works with CentOS 5.3 (both i386 and x86_64). What's the different between CentOS 5.3/5.5? I can't find it in release notes. And how can i fix it? Thanks very much. :) My ks file: # ========== install cdrom key --skip auth --useshadow --enablemd5 keyboard us lang en_US logging --level=debug selinux --disabled skipx timezone Asia/Hong_Kong text services --enabled=network bootloader --location=mbr zerombr clearpart --all --initlabel rootpw --iscrypted $1$h7EtIFv4$R9JQ4aCOVN7E9ml3A2SXv. firstboot --disable network --onboot=yes --bootproto=dhcp --hostname='iredos.iredmail.org' part swap --bytes-per-inode=4096 --fstype="swap" --size=512 part / --bytes-per-inode=4096 --fstype="ext3" --grow --size=1 %packages --excludedocs basesystem dialog %post --nochroot echo "* Mount CDROM" mkdir -p /mnt/sysimage/mnt/ mount -t iso9660 /tmp/cdrom /mnt/sysimage/mnt %post # Run in chrooted env. echo "* Export LC_ALL" export LC_ALL=C echo "* Set TERM" export TERM='linux' echo "* Set PATH" export PATH="/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin" dialog --yesno "Yes or no" 0 0 # ======== END KS ========= [1] dialog: http://hightek.org/dialog/

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