Software :: Using Two CentOS 5.5 Boxes To Serve Up Email?
May 16, 2010
I am trying to use two CentOS 5.5 boxes to serve up email. I wish to loadbalance HTTP, IMAP, POP3, and SMTP between the two servers. The servers are not in a cluster (the email software does not require it). What filesystem could be used to distribute/replicate the files between the two servers? I have tried NFS, GFS, and GlusterFS. All of which work but result in a latency that is unacceptable to the end users (webmail clients).
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Dec 15, 2009
We're trying out a few backup strategies and I had a question pertaining to CentOS installations. I was trying to think of the best way to back up and restore installation 'profiles' for a given server. In terms of a basic backup strategy.I currently back up the /etc, /var, /usr and /home directories with an rsync-based script, which has been working nicely so far.I also have a script which does a yum list installed on a certain configured server. It then 'diffs' this against the output from a base install of CentOS. The point of this is to figure out the packages installed for this server 'profile' so I can restore them.
Ideally, it would be nice if there were a way to generate kickstart files in reverse for a given server config. I was wondering what the best way to do this would be. Currently, I'm concerned enough about failures that I'm imaging stuff using Mondo Rescue.
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Dec 11, 2009
I was just wondering if someone could tell me the best method to connect all my hardwares together to achieve better result.HARDWARES.Cable ModemNETGEAR ROUTERNETGEAR FS728TS Smart switchLINUX SERVER WITH 2NICS.I want my dhcp server to serve 3VLAN networks. I need someone to show me how to do this. What do I need to do. keep in mind, I want eth0 to be used for public address only while eth1 for LAN. DHCP will be on eth0, but I need LAN on eth1 to be relayed back to eth0. This is my school project.
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Feb 6, 2009
i installed kde on my centos and now all of the text is boxes, im guessing its a missing language pack or something.
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Jul 6, 2010
I'm trying to install CentOS on one of those BSI portable boxes. When installing, it gives this error:"Errno 30 Read-only file system." Which is weird because it's obviously not read only, and doesn't fail right away. It's an IDE optical drive, and a SATA hard drive. I thought it was the SATA optical drive to IDE HDD install issue that has been seen before, but not the case here. The disc is in known-working condition.
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Feb 12, 2010
What's the consensus on the least hassle-prone method to do a bare metal install on multiple machines? I've just been handed a network with 20 identical servers (they're ~4 year old HP quad-Opteron machines with identical hardware configs). They're currently running a mishmash of stuff and I've been told I can re-purpose them. I'd like to create a generic kickstart and pave over them all with CentOS 5.4 with the only difference being the IP address for each machine. I have physical access to the machines and already know the MAC address for each one. Sadly, they are racked up and have no floppy or optical drive, but they DO have an exposed USB port on the front panel.
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Jan 22, 2009
My X-windows *server* is a Cygwin box. I installed the entire X11 packages. on the centos machine, I installed xterm and emacs.xterm comes up fine and the characters in the window are fine.with emacs, the characters in the windows are empty boxes.Do I need to install some things on the centos end to get the characters to render?
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Feb 7, 2011
i am not able to set up a crossover connection between 2 CENTOS 5.5 boxes.
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Dec 30, 2010
In CentOS 5.4 (Final), emacs is displaying characters as little boxes. see attached screen shot. I searched the Web and found others have this same problem with emacs in CentOS 5.4 but have not found any solution. I installed emacs in a base CentOS Amazon EC2 instance as follows:
yum -y groupinstall "GNOME Desktop Environment"
yum -y install emacs
yum -y groupinstall emacs
This issue does not arise for me in Amazon EC2 instances running Red Hat, Fedora, or Ubuntu when I install emacs as I did here. I am not X font savvy
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May 5, 2009
My first time installing centos server and adding it to xp home network. I am new to setting up my own network in general. I have a home windows wired ethernet xp network (simple linxs router) with 2 xp boxes and one centos5 box all connected to the same router. I just set up the centos box running tomcat on port 8080. I need to do two very basic things at this point, but am not sure what I need to do:
What do I need to do so I can:
1. Connect in firefox on one of my xp boxes and call the tomcat server running on my centos box?
2. Be able to ftp to centos box from either of my xp boxes?
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Jul 13, 2010
I'm having a bizarre problem with FTP transfers from my CentOS 5.3 boxes, All of my CentOS boxes appear to be limited at ~10kb/s when connecting to any FTP server outside of our network. We have no network infrastructure which would cause this, however when I use a windows based machine it is able to connect fine.
I took my laptop running Vista, and rebooted it onto a CentOS 5.3 LiveCD, and same issue.
I have checked our iptables, cleared the rules, removed the kernel modules, checked CBQ/TC it looks like nothing is limiting this. Also, other protocols work fine. Both the windows and linux boxes used passive transfers for it.
Is there anything other than iptables/CBQ which would be on a out of the box install of CentOS I should check? Is there any kernel settings for NAT connections which may cause this?
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Jan 13, 2011
I'm trying to setup a couple POP accounts in CentOS. I started doing a tutorial that had me install dovecot, and now I have dovecot running but I can't connect at all.Does anyone know of a simple way to get email up and running? It seems like it should be easier than the 14 step tutorials I was finding on Google.Also, should I leave dovecot or try and remove it?
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Mar 8, 2009
I'm very new to CENTOS here. Just wondering if there's any built-in email capability in CENT-OS 5?
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Feb 6, 2010
I can send a test email from the shell like this (say logged in as username jeff):mail -s test [URL] testing ctrl+d ctrl_d
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Feb 8, 2010
we have a small company sharing 1 email account. How can we monitor the activities in the email account like who's reading the messages etc.
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Sep 21, 2010
I have a shared email account few people are having access to it, Exactly I don't know how many people. Is there any way to find out how many people are accessing my email account? My server is Centos 5 and I am using IMAP. mail agent Postfix
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Jul 23, 2009
I have postfix sort of working correctly. postfix can send email to the internet but it doesn't want to send email to my local exchange server. What I need is for postfix to send emails directed to @xyz.com to my exchange server instead of itself.
My setup
mail.xyz.com - exchange 2003 server
www.xyz.com - centos 5.3 server with postfix
www.xyz.com can send emails to my hotmail.com account so that part works correctly. www.xyz.com can't send email to username@xyz.com. postfix seems to be delivering the email to itself and not the exchange server.
How can I tell postfix to send the @xyz.com emails to my exchange server?
Here is a sample of my /var/log/maillog
Jul 22 15:43:43 list postfix/smtpd[9802]: D63168604A3: client=localhost.localdomain[127.0.0.1]
Jul 22 15:43:53 list postfix/cleanup[9805]: D63168604A3: message-id=<20090722204343.D63168604A3@www.xyz.com>
[Code].....
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Aug 28, 2009
this seems silly but I am changing ISPs and need to change my notification email address (for here). Under User Menu -> Edit account it shows my email but does not allow me to change my email. Since I am able to post I assume I am logged in correctly. So what did I miss?
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Oct 26, 2009
I have Centos 5, Postfix version 2.3.3 on my server I can send and receive emails as normal. I sent some emails to one of our client and the email is in my sent emails box but when I contacted her she says she has't received it. I checked the server using Webmin there is a red exclamation mark next to the email.What red exclamation mark means and how can I get rid of it?
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Dec 17, 2009
I'm setting up an email server for a small office and need a few specific features. I was hoping that someone might give me a few recommendations to meet the following criteria:
IMAP support anti-spam some sort of webmail client - doesn't have to be fancy, but it needs a search function graphical administration panel The last one is so that other people in the office, who aren't necessarily familiar with linux, can do some basic administration. Adding mail boxes, etc.
I've seen the guide for Postfix/Dovecot. That's great but doesn't cover everything that I need. I've also seen Zimbra, which... Well I don't know, that may work, but the open source version has some features removed and that makes me leery. Have people had good experiences with open-source Zimbra? Is it sufficiently feature-complete?
Edit: Well, looks like I just needed to do a little more searching. This seems to cover most everything:[URL]... I'd still like to hear what people have to say about Zimbra though.
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May 5, 2010
I've come across a strange issue where any email address that I email with mail returns an error "Bad Address"
Fairly new Centos 5.4 Install, sendmail is the MTA.
Linux 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
DNS is working fine so there isn't a problem.
[root@hn1 /]# host -t mx iol.co.za
iol.co.za mail is handled by 10 mg1.iol.co.za.
iol.co.za mail is handled by 10 mg2.iol.co.za.
iol.co.za mail is handled by 30 vulpix.iol.co.za.
Yet when I try to use mail it fails:
[root@hn1 /]# which mail
/bin/mail
[root@hn1 /]# ls -lrth /bin/mail
-rwxr-xr-x 1 root mail 83K Jan 7 2007 /bin/mail
[root@hn1 /]# mail -s "test" bob@mydomain.co.za
Bad address
Nothing in the maillog.
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Sep 27, 2010
I want to increase attachment size in e-mail. At the moment it is 10M but I want to make it double.
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Nov 30, 2010
i m using code for sending email through GMAIL SMTP as given below... can any one tell me that how i can send EMAIL through Centos 5 CLI mode.... i which folder places i save my PHP files or any other supporting files etc.in graphical mode we use webbrowser but in Command line how i can use this project....
and also please tell me how i can run firefox in CLI mode
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Jun 2, 2011
How can I send email outside my LAN using postfix? Actually, I can received email from outside like yahoo. hotmail etc.. But when I am trying to send outside in my mail server here is the error I got..
Jun 2 21:19:51 microtontech postfix/smtp[4434]: connect to k.mx.mail.yahoo.com[98.139.54.60]: Connection timed out (port 25)
Jun 2 21:20:10 microtontech postfix/smtp[4435]: connect to
[code]....
I try to telnet yahoo.com and smtp.pldtdsl.net 25 here are the result, but when I try to telnet smtp.pldtdsl.net its showing trying only.. I checked if my ISP is blocking port 25 isn't. (I forgot what is the website I used to check if my ISP port 25 is block) I try already to used in my relayhost the [URL] but the email I sent still bouncing..But I remember last time when I was installed Hmailserver in my Win2K3 machine I sent email outside but I cannot received..
[code]....
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Apr 23, 2009
I have a user setup to receive email, which I would like automatically to be sent into a program that I'm writing. Should I be looking into procmail, or is there a shorter way in /etc/mail (for sendmail) to route all of a specific user's email into a program? I don't care whether the emails are ever written into /var/mail. CentOS 5.3, kernel 2.6.18-128.1.6.el5, sendmail 8.13.8
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May 13, 2009
I've got a server with several different virtual hosts on them, e.g. host1.com, host2.com, host3.com.
Is there a way I can set up an email alias just for an individual domain?
e.g. I want to set up help@host2.com, but not to have help@host1.com or help@host3.com.
I can't see how to do this in the /etc/aliases file...
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May 8, 2010
I have CentOS 5.4 running my file server. I finally got proftpd to work. I configured logwatch to send me email on a daily basis however I would like to be sent an email immediately when the proftpd log file changes. Is this possible?
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Aug 11, 2011
I'm trying to setup notification function for the Nagios Core which use Mail to send notification.I got an account from Rogers. I have SMTP server, email account with authentication information.My Nagios server is in a workgroup, there is now domain assigned to it, I just use nagiosserver.localdomain in /etc/hosts.I added Rogers SMTP server in /etc/mail/sendmail.mc and Future (AuthInfo) I created an /etc/mail/AuthInfo and add AuthoInfo:smtpserver "U:user" " P: pwd" "M:Plain"I added smtp server in /etc/mail/access for RelayI added root@nagiosserver.localdomain on /etc/mail/virtusertableI regenerated sendmail.cf by user m4 commandrestart sendmail service.When I ran: Mial -s test nagios4ccs@rogers.comIt did not prompt any error message , in the maillog it says the message is queued but It can not be sent out
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Jan 13, 2010
I recently restarted my Apache server to change the max upload from 5mb to 25mb. Once Apache restarted I tryed to go to my website via url www.website.com and a blank page with this source code:
<html>
<body bgcolor="#FFFFFF">
</body>
</html>
I also have two demo websites that I am running and when I go to there url's www.website.com/demosite apache will serve up the index.php
I didn't change anything but the max_upload in the apache2.conf and restarted.
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Apr 3, 2010
how to connect mysql server from ubuntu,.
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