Discuss December 2009

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295 participants
272 discussions

iptables -m connlimit
by Helmut Drodofsky 23 Dec '09

23 Dec '09

Hi, to the use of connlimit, I have found http://lists.centos.org/pipermail/centos/2008-June/059656.html Is there something new with centos 5.3 or 5.4? Helmut

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SOLVED - Re: Frustrations with MySQL loss, tcpdump, netstat, etc
by Slack-Moehrle 22 Dec '09

22 Dec '09

Hi Guys, OK, I figured out the problem, It would seem that Comcast spelling my DNS entry wrong would do it! I have done this a zillion times, I was totally stumped as to what I would be missing this time. Thanks everyone for their help. -Jason ----- Original Message ----- From: "Kai Schaetzl" <maillists(a)conactive.com> To: centos(a)centos.org Sent: Tuesday, December 22, 2009 9:31:19 AM Subject: Re: [CentOS] Frustrations with MySQL loss, tcpdump, netstat, etc MySQL is *not* listening on TCP 3306 since *long* unless you tell it to in the my.cf. It uses a local Unix socket by default. Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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NMS Opinions
by Joseph L. Casale 22 Dec '09

22 Dec '09

A recent post that mentioned Zabbix inspired me to have a look at them again while I was waiting on something as it’s been a while since I looked at them. Currently, I was using Nagios but had to start using Munin to add some functionality I needed and don’t want to continue down this road of supporting umpteen different packages. Between Zabbix, Pandora and HyperIQ, what would anyone familiar with these have to say. HyperIQ looks rather crippled for the FOSS version, Pandora’s website seems to be down☺ Maybe they a monitoring solution, heh… Any opinions appreciated! jlc

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IPTABLES --hitcount maximum value
by James B. Byrne 22 Dec '09

22 Dec '09

In-Reply-To: <4B30F618.6060809(a)kinzesberg.de> On: Tue, 22 Dec 2009 17:38:48 +0100, "Dirk H. Schulz" <dirk.schulz(a)kinzesberg.de> wrote: > That is a new "phenomenon" I also ran into. You now have to > adjust memory values. > > I have added to my /etc/modprobe.conf > "options ipt_recent ipt_pkt_list_tot=75" > Now I can use hitcount values of 50 (did not test if the above > is sufficient for higher values). I found this on the net so I deduce that you would be safe up to a hitcount value of 75. > [PATCH] netfilter: ipt_recent: sanity check hit count > From: Daniel Hokka Zakrisson > Date: Sat Mar 15 2008 - 10:11:05 EST > > If a rule using ipt_recent is created with a hit count greater > than ip_pkt_list_tot, the rule will never match as it cannot > keep track of enough timestamps. This patch makes ipt_recent > refuse to create such rules. > > With ip_pkt_list_tot's default value of 20, . . . Thanks for the lead. Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Frustrations with MySQL loss, tcpdump, netstat, etc
by ML 22 Dec '09

22 Dec '09

Hi All, Hi All, MySQL 5.0.77 on CentOS 5.4 MySQL is running, my Wordpress stuff is working, but I cannot connect to the server from my house. This server is in my house, however, but on a public IP, behind a firewall, etc. I checked my hardware firewall (a dedicated UnTangle system) and that is successfully allowing the passage. I know this because the firewall shows: 2009-12-22 6:29:41 am passed <my IP>:35606 <server IP>:3306 I checked the firewall (system-config-securitylevel-tui) on the server and that has 3306:tcp allowed. When I try to connect I get an error (4) which when I google says: "Interrupted System call" I have tried using the MySQL Workbench and other client software. If I look in /var/log/mysqld.log I dont see anything but the fact the server started. I tried stopping mysql with /etc/init.d/mysqld stop Then starting with mysqld_safe --init-file=/tmp/code.txt & Where code.txt contains: UPDATE mysql.user SET Password=PASSWORD('mypassword') WHERE User='root'; GRANT ALL ON mysql.* to 'root'@'127.0.0.1'; GRANT ALL ON mysql.* TO 'root'@'localhost'; GRANT ALL ON mysql.* TO 'root'@'my home IP'; FLUSH PRIVILEGES; commit; and I still cannot connect. But the database starts and this code executes because If I go to the console and run /usr/bin/mysql -u root -p and use this password from the update statement that password gets me in. So, on my server I run tcpdump host <my ip> and I dont think I see anything where 3306 is coming through. if I run a test MySQL connection from the MySQL Workbench and they run netstat on my server and I dont see a entry where 3306 is used in what netstat is dumping. What am I doing wrong? What can I check for? I am stumped! -Jason

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Re: [CentOS] Frustrations with MySQL loss, tcpdump, netstat, etc
by ML 22 Dec '09

22 Dec '09

Rick, > have you tried to telnet to port 3306 of the machine where the mysql > server is located, from your home machine? if so, what do you get? > If you're successful you'll get a connect bit that includes a string > that will show your mysql server version number. if you don't have > mysql access you'll likely see a mysqld reject of some nature. if > there's a network issue you'll just get a hang or you could get an > unreachable error. Yup, it works: $ telnet 173.13.167.209 3306 Trying 173.13.167.209... Connected to mail.mailnewsrss.com. Escape character is '^]'. 4 5.0.77aWqQ!OMq,slG]|xft5L[fConnection closed by foreign host.

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IPTABLES --hitcount maximum value
by James B. Byrne 22 Dec '09

22 Dec '09

Is the maximum permitted value for --hitcount documented anywhere? I reliably get a iptables-restore error when I specify a hitcount value greater than 20 but I cannot find any mention of there being a maximum value. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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CENTOS 5.3 "kernel segfault at ..."
by mcclnx mcc 22 Dec '09

22 Dec '09

We have CENTOS 5.3 on DELL server. Recently I saw /var/log/messages have following pop-up: Dec 19 11:31:45 ORA2 kernel: oracle[18900]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007fff8eff2c60 error 4 Dec 19 11:31:49 ORA2 kernel: oracle[18902]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007ffff5e12a80 error 4 Dec 19 11:31:53 ORA2 kernel: oracle[18904]: segfault at fffffffffffffff0 rip 0000000007d54183 rsp 00007fff228684d0 error 4 Anyone know why? Thanks. ___________________________________________________ 您的生活即時通－溝通、娛樂、生活、工作一次搞定！ http://messenger.yahoo.com.tw/

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routing with 2 ISPs
by David Hláčik 22 Dec '09

22 Dec '09

Hello guys, Sorry to bothering you. I had a small network with one ISP and firewall. eth1 -> Is connected to my ISP eth0 + eth0.1 , eth0.2 and etc are my local networks. All my network accesses internet via eth1. My routing table looks like the following : 213.194.242.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.123.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.123.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.123.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0.8 10.123.42.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0.5 10.123.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0.7 10.123.40.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0.4 10.123.30.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.123.44.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0.6 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0.8 0.0.0.0 213.194.242.1 0.0.0.0 UG 0 0 0 eth1 Recently I have added secon provider via ADSL. ADSL modem is connected via eth0.8 . Using adsl-setup I have created ppp interface ppp0. Now I want to achieve the following : Computers from local network range 10.123.123.0/24 (eth0.7) should access internet using my second internet provider via ppp0. I believe that for that I need to use advanced networking and iproute package. I will add the second routing table named "adsl" and configure routing via ppp0 there. Together with that i need to set in iptables , nat table to masquerade all ips going out via ppp0. I believe I need to use ip command for this. And the finally my questions are : 1) Is there a good tutorial / howto for using iproute on the internet, except of the LARTC.org 2) Can i utilize by tools of CentOS, to have my configuration (with second routing table, using ip ) somehow stored - to be permanent when I will do machine restart? I mean there are networking-scripts /etc/sysconfing/network-scripts which can handle, IP assigment, virtual LANS, aliases even static routes. Can they handle advanced routing as well? Thank you milion times. David Hlacik

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xm mem-set on an F11 xen guest
by Scot P. Floess 22 Dec '09

22 Dec '09

I just tried to change the memory for my F11 xen guest from 512 to 1024. After executing: xm mem-set workstation 1024 xm list shows the memory still being 512. Anyone else see this behavior before? I tried other values as well - but the memory is still what it was when I created the VM... I'm running CentOS 5.4 on an i386... Scot P. Floess 27 Lake Royale Louisburg, NC 27549 252-478-8087 (Home) 919-890-8117 (Work) Chief Architect JPlate http://sourceforge.net/projects/jplate Chief Architect JavaPIM http://sourceforge.net/projects/javapim Architect Keros http://sourceforge.net/projects/keros

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Discuss December 2009