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Which imapd?
by Morten 26 Oct '05

26 Oct '05

Hi. What imapd can you recommend for minimum configuration and maintenance (no Cyrus)? This is for a small shop, so no hard performance requirements. I'd prefer one where I don't have to build my own packages (no Courier, unless packages exist). Thanks. Morten

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Kernel 2.6.9 hangs
by Fong Vang 26 Oct '05

26 Oct '05

I upgraded from a RedHat 9 to CentOS 4.1 system using yum without any hiccup. Upon reboot, the kernel appears to be stalled after printing this message: "Creating block devices". Keyboard is still responsive and you can press ALT-CTRL-DEL to reboot the system (when pressed, it says something about MD being unmounted). This is the last few lines before it hangs: Freeing unused kernel memory: 176k freed Rd Hat nash version 4.2.1.3 starting Mounted /proc/filesystem Mounting sysfs Loading jbd.ko module Loading ext3.ko module Creating block devices The kernel I'm using is the kernel-smp-2.6.9-11.EL.i686.rpm (I've also tried the uni processor kernel with the same result). What happens after creating block devices? Any idea what to look for/check? TIA!

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vsftpd failing since upgrade to 4.2
by scott 26 Oct '05

26 Oct '05

My vsftpd was working. I use it configured via xinetd and turn it off (disabled = yes) when I'm not using it to keep the bad guys from hammering on it. Recently I upgraded to 4.2 (via yum update). That' the only change I know of on the system. And I didn't have any problems with it. Today when I try to ftp, i enabled it in xinetd.d (with disable = no and a "service xinetd restart") But I can't connect. Well, I connect, but then I'm dropped with the reply: 500 OOPS: cannot open config file:/etc/vsftpd/vsftpd.conf The config file is there: -rw------- 1 ftp ftp 4271 Oct 23 21:03 vsftpd.conf I haven't changed it's permissions. the ftp account appears intact: ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin There are no related entries on tehlog, only the connect in /var/log/secure: Oct 23 21:11:58 tn1 xinetd[13086]: START: ftp pid=13113 from=xx.xx.xx.xx I tried starting it manually via service vsftpd start. That appeared to start fine, but when I look no process is running. So I tried to start it manually and get teh same error [root@tn1 init.d]# /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf 500 OOPS: cannot open config file:/etc/vsftpd/vsftpd.conf Anyone help? Thanks, Scott

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Re: [CentOS] Load balancing email?
by Benjamin Smith 26 Oct '05

26 Oct '05

Using multiple A records is good for performance balancing, but what if one of the systems fails? Using your cocnfiguration, the delivering mail server has an "a" record and a single MX, so it wouldn't try the other mail server in the case of a failure, right? Whereas, by listing multiple IPs and mx1/mx2, wouldn't the delivering mail server try the other address? Thanks, -Ben On Tuesday 25 October 2005 16:02, you wrote: > I once did this and it worked great: > > IN MX 10 mx.example.com. > > mx IN A 192.168.1.1 > IN A 192.168.1.2 > > ...etc. Perfect DNS load balancing. > > Jack > > Benjamin Smith wrote: > > >Currently, we have two mail relays for inbound messages, and a third for POP. > > > >The inbound messages go thru all the CPU-intensive anti-spam stuff, and then > >they relay it to the POP server for pickup. > > > >Currently, one of these is the "primary", and the other is "secondary", and > >I'd like them to be considered more or less as equals, since the "primary" > >system is getting beaten pretty hard. > > > >The DNS zone file says something like this: > > > >############################### > >@isp.com > ><SNIP> > > IN MX 100 mx1.isp.com. > > IN MX 1100 mx2.isp.com. > ><SNIP > >################################ > > > >I seem to recall that I make them act as "equals" by simply changing this to > > > >############################### > >@isp.com > ><SNIP> > > IN MX 100 mx1.isp.com. > > IN MX 100 mx2.isp.com. > ><SNIP > >################################ > > > >so that they both get about the same amount of inbound messages. Has anybody > >here actually done this? How well does this work as far as failover if either > >system fails? > > > >-Ben > >-- > >"The best way to predict the future is to invent it." > >- XEROX PARC slogan, circa 1978 > >_______________________________________________ > >CentOS mailing list > >CentOS(a)centos.org > >http://lists.centos.org/mailman/listinfo/centos > > > > > -- "The best way to predict the future is to invent it." - XEROX PARC slogan, circa 1978

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Re: [CentOS] Load balancing email?
by Benjamin Smith 26 Oct '05

26 Oct '05

Just wondering - have you tried greylisting? Why or why not? -Ben On Tuesday 25 October 2005 15:42, replies-lists-centos(a)listmail.innovate.net wrote: > you are correct. setting the ordinals to be the same (whatever value you > select) will cause the entries for the two machines to rotate. failover > works mostly (it depends on how the first machine fails and related > timeout issues). > > i would actually suggest a somewhat different setup. > > the problem with multiple external mail hosts is that the more you have > the more spammers have to hit. [they don't care about mx record > ordinals, etc.] with your spam stuff on these front-end machines (if i > understand your configuration correctly), the spammers are just eating > up your resources. > > so, instead, set up one or more (depending on load/needs) front-end > machines. use DNSBL in sendmail/postfix (whichever you feel more > comfortable configuring) to cut down on the junk. [when i last checked, > dnsbl blocking dynamic IPs (dialup/cable modems) cut the basic trash > down by 60-70%.] > > then, put your anti-spam stuff on one (or more if necessary) back-end > machines that only accept mail from the front-end machines. that way > your anti-spam stuff is only going to see mail that's gone through the > dnsbl and won't be taking up resources of the basic mail handling on the > front-end machine(s). > > after the anti-spam machine(s), pass the mail on to your pop/imap server. > > i suspect that with this setup you could have one front-end machine, > load-balance (with two A-records for the same name but different > ipnumbers (aka DNS shuffle-A)) for two anti-spam machines and you'll be > ok. > > if you want a second front-end machine, for fail-over, you have to > realize that it will get just about as much spam as the first machine, > regardless of your mx-record settings. it's good to have it, just > realize you're provide a second door that the spammers will *always* try. > > in short, put the resource intensive anti-spam stuff back a level from > the external SMTP server(s). that will let the SMTP servers do their job > without getting high load from the anti-spam stuff. > > > - Rick > > > > ------------ Original Message ------------ > > Date: Tuesday, October 25, 2005 03:03:55 PM -0700 > > From: Benjamin Smith <lists(a)benjamindsmith.com> > > To: centos(a)centos.org > > Subject: [CentOS] Load balancing email? > > > > Currently, we have two mail relays for inbound messages, and a third > > for POP. > > > > The inbound messages go thru all the CPU-intensive anti-spam stuff, > > and then they relay it to the POP server for pickup. > > > > Currently, one of these is the "primary", and the other is > > "secondary", and I'd like them to be considered more or less as > > equals, since the "primary" system is getting beaten pretty hard. > > > > The DNS zone file says something like this: > > > >############################### > > @isp.com > > <SNIP> > > IN MX 100 mx1.isp.com. > > IN MX 1100 mx2.isp.com. > > <SNIP > >################################ > > > > I seem to recall that I make them act as "equals" by simply changing > > this to > > > >############################### > > @isp.com > > <SNIP> > > IN MX 100 mx1.isp.com. > > IN MX 100 mx2.isp.com. > > <SNIP > >################################ > > > > so that they both get about the same amount of inbound messages. Has > > anybody here actually done this? How well does this work as far as > > failover if either system fails? > > > > -Ben > > -- > > "The best way to predict the future is to invent it." > > - XEROX PARC slogan, circa 1978 > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > http://lists.centos.org/mailman/listinfo/centos > > ---------- End Original Message ---------- > -- "The best way to predict the future is to invent it." - XEROX PARC slogan, circa 1978

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lilo for centos 4.2
by Jerry Geis 26 Oct '05

26 Oct '05

>On 10/25/05, Jerry Geis <geisj at pagestation.com <http://lists.centos.org/mailman/listinfo/centos>> wrote: >/> Where can I get lilo for centos 4.2? />>/ />/> I did "up2date lilo*" and nothing was retrieved. / >Is it already installed? rpm -q lilo to verify. >Lilo is part of the base repository for 4.2, and should be version 21.4.4-26.1 rpm -q lilo gives me package lilo is not installed I was able to download it from RPMS/lilo.... from a miror and install it. I just thought "up2dte lilo*" would go grab it for me. Jerry

2 1

tux
by Bassett, Mark 26 Oct '05

26 Oct '05

Anyone able to get tux working on centos 4 ? Tux causes a kernel panic after a few minutes when running on a CentOS 4 box. Mark Bassett Omaha World Herald Firewall Administrator Certified Ethical Hacker mark.bassett(a)owh.com

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lilo for centos 4.2
by Jerry Geis 26 Oct '05

26 Oct '05

Where can I get lilo for centos 4.2? I did "up2date lilo*" and nothing was retrieved.

2 1

Problem SSH
by Mauricio Merlin 25 Oct '05

25 Oct '05

My Centos 4.1 only accept connections from localhost, my file conf is default. error: ssh: connect to host 192.168.1.78 port 22: No route to host thanks

5 4

Re: [CentOS] xfontsel larger font
by C.M. Connelly 25 Oct '05

25 Oct '05

"JG" == Jerry Geis <geisj(a)pagestation.com> JG> I am running xfontsel. I dont seem to be able to select an JG> helvetica font > 34 points. I am looking for something JG> around 75 points. I dont seem to be able to find anything JG> that large. xfontsel just provides an interface for generating the ``X Logical Font Description'' name for fonts, which you then plug into some configuration file to actually use the font -- why not just specify 24 pt Helvetica, then change the 240 to 720? Claire -- *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Claire Connelly cmc(a)math.hmc.edu Systems Administrator (909) 621-8754 Department of Mathematics Harvey Mudd College *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

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