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sendmail delay in presenting banner
by Gregory P. Ennis 24 Mar '14

24 Mar '14

I am using a Centos 6.5 machine as a mail server with sendmail as the MTA. I have a problem with a delay of sendmail presenting its banner so that the process of accepting e-mail can begin. The log files demonstrate as much as a 2 minute delay between the connection and the banner presentation. #telnet Mail.DOMAIN.com 25 Connected to mail. Escape character is '^]'. < two minute delay before the next line is presented> h220 Mail.DOMAIN.com. ESMTP Sendmail 8.14.4/8.14.4; Sun, 23 Mar 2014 10:17:44 -0500 Log entries on the mail server for the above connection: Mar 23 10:16:05 Mail sendmail[31229]: NOQUEUE: connect from NAME.DOMAIN.com [10.0.0.187] Mar 23 10:17:44 Mail sendmail[31229]: AUTH: available mech=GSSAPI CRAM-MD5 DIGEST-MD5, allowed mech=EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN I have made the observation that if I put in the following line in the access file the 2 min delay goes away Connect:10.0.0.187 RELAY Obviously I can not set up a relay for every ip address, but this does solve the problem for internal network delivery of mail to the mail server. I am using named for local dns service and have not been able to identify any errors or problems. When I evaluate nslookup NAME.DOMAIN.com 127.0.0.1 I appropriately get 10.0.0.187 So far I am stumped on this problem, if any of you have suggestions I would appreciate your help Greg Ennis

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Re: [CentOS] [CentOS} Does anyone use tcp_wrappers?
by adrian＠pa0rda.nl 24 Mar '14

24 Mar '14

Most certainly YES!!! Next to iptables tcp_wrappers is a solid seconde line of defense. The argument that is is no longer developped is rubbish. The package does what is should do, functionality isexactly what it should be and it is bug free. Also it is flexible enough to do other tricks with it like spawning something depending on the ip address the incoming connection is coming from. It is a great product thanks to Wietse Venemaand others who integrated it to e.g. ssh. Dont drop it please!!!!!!!!!!! Adrian -- Adri P. van Bloois Antonlaan 104 email: adrian(a)pa0rda.nl 3701 VG Zeist voice: +31-(0)-30-6912741 The Netherlands fax: NONE 52 05'15.77"N 5 4'44.56"E QTH-locater JO 22 OC "When all is said and done, there is more said than done"

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OT: DELL PERC H200
by m.roth＠5-cent.us 23 Mar '14

23 Mar '14

Does anyone know if a PERC H200 is a real RAID controller? I'm about to build a box to CentOS 6.5 (it was Windows...) with RAID 6 on Monday, and this PE R610 has this.... I'm familiar with PERC 6 and 7s, but just dunno 'bout this one. mark

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RHEL/CentOS 7 Dual boot with CentOS 5.x/6.x - default boot quick solution/howto
by Ljubomir Ljubojevic 23 Mar '14

23 Mar '14

I have RHEL 7 Beta installed in dual boot with CentOS 6.x. Since RHEL 7 installed GRUB2, I had problem that RHEL 7 is default boot. My personal solution was to go to /etc/grub.d and run command: mv 10_linux 31_linux grub2-mkconfig -o /boot/grub2/grub.cfg Explanation: - /etc/grub.d is where grub2 writes down config files used to create boot menu. - OS-prober creates 30_os-prober file in /etc/grub.d - 10_linux is created for RHEL/CentOS 7.x system installed. If you change order of files in /etc/grub.d (numbers at the start of the files) the list generated with grub2-mkconfig will change order in the GRUB2 menu :) Fedora/RHEL 7.x have a changed GRUB2 so for further reading read: 5.3 Multi-boot manual config: http://www.gnu.org/software/grub/manual/grub.html#Multi_002dboot-manual-con… and Fedora GRUB Wiki: http://fedoraproject.org/wiki/GRUB_2 -- Ljubomir Ljubojevic (Love is in the Air) PL Computers Serbia, Europe StarOS, Mikrotik and CentOS/RHEL/Linux consultant

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Changing isolinux/splash.jpg on custom ISO
by Digimer 22 Mar '14

22 Mar '14

Hi all, I know I've done this in the past, but I can't seem to get it working today... I want to roll my own ISO and use custom splash.jpg. If I roll the ISO with the stock splash.jpg, it works. When I save my own 800x600 .jpg as splash.jpg though, I get a black screen. I made sure the permissions and ownership was the same. Is there a special way that the JPG has to be save for it to be used? Thanks! -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?

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Re: [CentOS] Does anyone use tcp wrappers (hosts.allow/hosts.deny) anymore?
by James B. Byrne 22 Mar '14

22 Mar '14

On Thu, March 20, 2014 18:52, Les Mikesell wrote: > xml isn't intended for humans - it is supposed to be parsed and > verified by machines. The bigger question is why the machines aren't > managing the config files themselves yet? > Possibly because the machines are running programs written by humans that need to understand what they think they have told the machine to do in order to determine why it is not doing what they want it to? -- *** 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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Re: [CentOS] rsync triggers oomkiller
by SilverTip257 22 Mar '14

22 Mar '14

I added a subject so we can track this message on the list easier. ;) On Fri, Mar 21, 2014 at 12:19 PM, John Doe <jdmls(a)yahoo.com> wrote: > Hey, > > kernel: rsync invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0, > oom_score_adj=0 > ... > kernel: Out of memory: Kill process 27974 (mysqld) score 361 or > sacrifice child > kernel: Killed process 27974, UID 27, (mysqld) total-vm:3804672kB, > anon-rss:2890828kB, file-rss:3324kB > > rsync whines he wants more RAM and... mysql gets killed... > That makes me a bit sad! > And from my nagios graphs, at that time, ram usage was only 75% > (4.5GB/6GB) and swap usage 0.3% (/2GB)! > I cannot believe an rsync suddenly needed 1.5GB+2GB and was not > satisfied... > And even after the out of memory, the graphs show no swap usage change at > all. > Anybody would have an idea about this "fake" out of memory? > Wild. I've not encountered oomkiller being triggered when the server has free memory and hasn't swapped to disk yet. After the fact, it will probably be almost impossible to figure out the list of files that rsync was storing in memory. This makes me wonder if there's an option to have rsync log the list of files (to be synced) to a log file of some sort. I'll have to look into it later today when I have a moment. > > Thx, > JD > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- ---~~.~~--- Mike // SilverTip257 //

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Re: [CentOS] Does anyone use tcp wrappers (hosts.allow/hosts.deny) anymore?
by James B. Byrne 21 Mar '14

21 Mar '14

On Thu, March 20, 2014 17:34, Always Learning wrote: > > > Nothing remains static. Software evolves into usually superior products. > Sentimentally longing for the past hampers the introduction of new and > better replacements. Yes. For example look how MicroSoft has improved Windows since XPsp3.;-^) -- *** 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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mellanox ofed on centos kernel 3.x
by Robert Clove 21 Mar '14

21 Mar '14

Hi all, Has anyone installed mellanox ofed on linux kernel 3.x? Regards

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Tar Compression issue
by Bonnie B Mtengwa 21 Mar '14

21 Mar '14

I have a file Server CentOS 5.10, its on the internet, so I compress all csv into one file using (tar -czvf compressed_files.tar.gz *.csv) on this server so that I can download them as one compressed file to save bandwidth, Disk space on this server available is 50Gig, so when I copy the files onto Redhat EL 5.9 and decompress them using (tar -zxvf *.gz) It decompresses maybe 80% then get error: gzip: stdin: unexpected end of file tar: Unexpected EOF in archive tar: Unexpected EOF in archive tar: Error is not recoverable: exiting now what might be the issue here? Bonnie B Mtengwa Email: <mailto:bonnie.mtengwa@potraz.gov.zw> bonnie.mtengwa(a)potraz.gov.zw | <mailto:bonniebm@gmail.com> bonniebm(a)gmail.com Web: <http://www.potraz.gov.zw/> www.potraz.gov.zw

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