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iptables info in proc - ttl
by Carlos S 09 Apr '10

09 Apr '10

Hello List, I am having problem in getting iptables recent module working for me, so I was looking into /proc to get some clues. I see following line in the /proc for my iptables recent rule: # cat /proc/net/ipt_recent/badguy src=10.0.0.17 ttl: 63 last_seen: 3301974512 oldest_pkt: 2 3301973507, 3301974512 What does ttl mean? Is it time-to-live or what? What does it signify? -- CS

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about the bug of BCM57780
by mojian4linux 09 Apr '10

09 Apr '10

https://bugzilla.redhat.com/show_bug.cgi?id=525966 ------------------------------- Was this bug found on centos5.4

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Kernel panic due to vg00 not found while not using LVM at all
by Peter Blajev 09 Apr '10

09 Apr '10

Hi, I have a system running CentOS4.8. Last month I installed the latest updates including kernel 2.6.9-89.0.23 and rebooted the system. It has been running for almost a month. Last night I updated the system again which updated only a few packages: openssl, tzdata, curl,vixie-cron and logrotate. No new kernel or anything out of ordinary. The reboot after the update stopped with kernel panic: --<snip>-- Loading dm-snapshot.ko module Making device-mapper control node Scanning logical volumes Reading all physical volumes. This may take a while... Activating logical volumes Volume group vg00 not found ERROR: /bin/lvm exited abnormaly! Creating root device --<snip>-- After that it's trying to mount root and it fails with kernel panic. This system is using disk partitions. It's not using LVM. I can boot in rescue mode and "chmod /mnt/sysimage". All partitons are there and mountable. No fsck errors. I checked /boot/grub/grub.conf and it looks fine to me. The time stamp was from last month when I did the first update. Also there are no new files in /boot since the update from last month. Why is it looking for logical volumes? Any idea? Thanks Peter

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CentOS press kit
by Geerd-Dietger Hoffmann 08 Apr '10

08 Apr '10

Hey Looking at the Fedora ML there is some commotion about a Press Kit [1] they are constructing. I am thinking about doing something like this for CentOS. Now comes my question, what do people think should belong in such a kit. Do you think this is needed? Cheers for your help, Didi [1] https://fedoraproject.org/wiki/F13_press_kit -- Hoffmann Geerd-Dietger http://contact.ribalba.de

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vsftpd saving uploads twice
by Dirk H. Schulz 08 Apr '10

08 Apr '10

I have configured my vsftpd instances to use virtual users and map them to a system user. So all uploads should be written with owner and group of this system user (let's call it ftpsystemuser). But in the the last weeks/months it appears that uploads are written twice, on instance as it should (owner and group of the system user used to map the virtual user that did the upload), and the other instance as root. Lik this: > -rw-r--r-- 1 root root 19968 16. Mär 11:24 Termine > Leistungspr%FCfungen.doc > -rw-r--r-- 1 ftpsystemuser ftpsystemuser 19968 16. Mär 11:24 Termine > Leistungspr?fungen.doc As you can see both instance use different syntax for the file name in case of German umlauts. In vsftpds log only the correct file is mentioned. Can anybody tell me what is happening here? Is this something I can get rid off using certain configuration? Is it a security problem? Any hint or help is appreciated. Dirk

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Question about dhcpd.leases
by Niki Kovacs 08 Apr '10

08 Apr '10

Hi, I'm running a DHCP server on my local network. I've noticed something that puzzles me. Leases are written to /var/lib/dhcpd/dhcpd.leases, but only - so it seems to me - if the address is not fixed in any way in dhcpd.conf. Here's a few stanzas of my dhcpd.conf : host babasse { hardware ethernet 00:0d:61:ae:6b:8f; fixed-address 192.168.1.1; option host-name "babasse"; } host bernadette { hardware ethernet 00:0d:61:a6:e7:1e; fixed-address 192.168.1.2; option host-name "bernadette"; } host raymonde { hardware ethernet 00:20:ed:b8:e8:ec; fixed-address 192.168.1.3; option host-name "raymonde"; } host lifebook { hardware ethernet 00:0b:5d:46:f2:10; fixed-address 192.168.1.5; option host-name "lifebook"; } How comes these machines never appear in dhcpd.leases ? Do the respective leases only find their way into /var/log/messages ? Cheers, Niki

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No ulimit for user
by Stephen Nelson-Smith 08 Apr '10

08 Apr '10

Hi, I'm trying to remove any limit on open files for a user; I've set username nofiles to unlimited in /etc/security/logins.conf, but now I get "could not open session" if I try to su to the user. singhh - nofile unlimited I think this is related to PAM, so I've modifed /etc/pam.d/su and /etc/pam.d/login to use pam_limits.so: # cat /etc/pam.d/su #%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" group. #auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wheel" group. #auth required pam_wheel.so use_uid auth include system-auth account sufficient pam_succeed_if.so uid = 0 use_uid quiet account include system-auth password include system-auth session required pam_limits.so session include system-auth session optional pam_xauth.so # cat /etc/pam.d/login #%PAM-1.0 auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth include system-auth account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session include system-auth session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so pam_limits.so open session optional pam_keyinit.so force revoke What am I doing wrong? S.

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Bash Question
by Joseph L. Casale 08 Apr '10

08 Apr '10

Hey guys, messing around with a snippet from a mailing list post, #!/bin/bash mkfifo -m 666 /var/spool/my_fifo exec 42<> /var/spool/my_fifo while true do while read -t 5 data <&42 do echo "data is ($data)" done echo "read again" done What happens to this to invalidate the initial 'true' condition, it only runs for a short while? Thanks! jlc

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lokkit
by Jerry Geis 08 Apr '10

08 Apr '10

I have used lokkit to setup iptables ( I have a big script that does this) basically just ports I want with "--port=https:tcp" etc... I wish to allow igmp and add igmp to the lokkit command line? How do I do that? I can add this to /etc/sysconfig/iptables: iptables -A RH-Firewall-1-INPUT -i eth1 -j ACCEPT iptables -A RH-Firewall-1-INPUT -i eth1 -p igmp -j ACCEPT iptables-save > /etc/sysconfig/iptables and that works - but I wish my script and the lokkit command to do. "lokkit --help" goesnt give me anything that I saw. Thanks, Jerry

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Re: [CentOS] Consecutive Jobs
by Les Bell 08 Apr '10

08 Apr '10

"Joseph L. Casale" <jcasale(a)activenetwerx.com> wrote: >> It really is as simple as I wrote out earlier, multiple servers ssh a background job at nearly the same time consisting of an rsync command. The destination host for this target gets overwhelmed with more than one at a time... << This isn't a complete answer, but a possible approach: I'd use a named pipe on the destination host. Here's a little experiment to demonstrate. [user@dhost temp]$ mkfifo pipe [user@dhost temp]$ while true ; do ` < pipe` ; done Now, in another xterm: [user@dhost temp]$ echo date > pipe [user@dhost temp]$ echo 'ls -l' > pipe You can 'echo' commands to the pipe in multiple windows; the while loop will only read and execute one command at a time off the pipe. You can see where this is going - now your multiple servers just ssh those echo commands to the destination host and the corresponding commands are executed. I'll leave it to you to make it suitably robust if you go this way; you'll need to add some error handling, possibly signal handling, etc. but that's just standard shell scripting. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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