Sponsored Content
Top Forums UNIX for Advanced & Expert Users Email Server High Availability Post 302968406 by sunnysthakur on Wednesday 9th of March 2016 07:04:58 AM
Old 03-09-2016
Email Server High Availability

Hello,

We are planning to setup a Email server with High Availability for email services so that if SMTP/POP/IMAP goes down on one server, the services switch to second server.
We are planning to use a Linux machines from a hosting provider and will do it using DNS with multiple MX records with round robin.

Now i have couple of queries regarding this setup :-
  • Is this possible to have a same domain name to bind with 2 IPs i.e xyz.com point to 1.1.1.1 on one server and xyz.com point to 2.2.2.2 on second server.
  • How can we setup MX records for each server on DNS for email failover.
  • As we have a separate servers for this setup that means data related to email would be reside on separate server (because they have separate HDD), so in case 1st server goes down and it switch to second server, will i skipped my email which was received on 1st server before it goes down as my email client will receive them on certain period of time.

Please let me know if above is a valid query.
 

7 More Discussions You Might Find Interesting

1. AIX

AIX and port trunking / high availability

Hi all I was just wondering what modes AIX supports for port trunking ( bonding, etherchannel, link aggregation or whatever you want to call it ) I'm in particular looking for a high availability mode ( other than 802.3ad ) (2 Replies)
Discussion started by: art
2 Replies

2. UNIX for Advanced & Expert Users

High availability/Load balancing

Hi folks, (Sorry I don't know what its technology is termed exactly. High Availability OR load balancing) What I'm going to explore is as follows:- For example, on Physical Servers; Server-1 - LAMP, a working server Server-2 - LAMP, for redundancy While Server-1 is working all... (3 Replies)
Discussion started by: satimis
3 Replies

3. UNIX for Dummies Questions & Answers

iscsi high availability

Hi, I want to set up a iscsi high availability with sheepdog distributed storage. Here is my system set up. Four nodes with sheepdog distributed storage and i am sharing this storage through iscsi using two nodes as well as using a virtual ip set up using ucarp.Two nodes using same iqn. And... (0 Replies)
Discussion started by: jobycxa
0 Replies

4. AIX

AIX high availability 1-3/69

Hi, Can someone help and give the answer for the following questions: 1. When PowerHA SystemMirror 7.1 is installed on AIX 7.1, what RSCT component does Cluster Aware AIX (CAA) replace? A. Group Services B. Resource Manager C. Topology Services D. Resource Monitoring and Control... (2 Replies)
Discussion started by: walterchang100
2 Replies

5. Red Hat

Redhat 5 High Availability Add-on

Hello Experts, I have a question about Redhat HA Add-On, how can i setup an Active/Active Cluster using Redhat 5.7 64Bit, with Round-Robin technique. Each server will run an application and oracle database without RAC. Thanks (0 Replies)
Discussion started by: karmellove
0 Replies

6. Solaris

High availability

hi guys I posted problem last time I didn't find answer to my issue. my problem is as below: I have two servers which work as an actif/standby in high availability system. but when i use command HASTAT -a i have the following message: couldn' find actif node. the servers are sun... (1 Reply)
Discussion started by: zineb06
1 Replies

7. Red Hat

Redhat: High Availability

Hi, I want to create gfs storage. But getting error as below: --> Finished Dependency Resolution Error: Package: pacemaker-1.1.12-22.el7_1.2.x86_64 (rhel-ha-for-rhel-7-server-eus-rpms) Requires: sbd You could try using --skip-broken to work around the problem You could try... (1 Reply)
Discussion started by: mzainal
1 Replies
rabid(8)							      Postal								  rabid(8)

NAME
rabid - program to test POP server throughput. SYNOPSIS
rabid [-r max-connections-per-minute] [-p processes] [-l local-address] [-c messages-per-connection] [-a] [-s ssl-percentage] [-i imap-per- centage] [-b qmail-pop] [-d download-percentage[:delete-percentage]] [-[z|Z] debug-file] [-u] pop-server user-list-filename DESCRIPTION
This manual page documents briefly the rabid, program. It is designed to test the performance of POP email servers by reading all messages from randomly selected accounts as fast as possible. A future version will support rate limiting to provide a constant load (for testing SMTP servers). The pop-server parameter specifies the IP address or name of the mail server that the mail is to downloaded from. If you want to specify a port other than port 110 then enclose the host address in square brackets and have the port address immidiately following. If you want a DNS lookup for every connection (for testing round-robin DNS) then immediately preceed the host address with a '+' character. The user-list-filename is the name of a file which contains a list of user's email addresses and passwords. It will have one address per line and the password follows the address with a space to seperate. The processes parameter is the number of processes that should be forked off to attempt seperate connections. A well configured mail server won't accept an unlimited number of connections so make sure you don't specify a number larger than the number your mail server is configured to handle. Also for sensible results make sure that you don't use enough to make your server thrash as the results won't be representative of real-world use. The max-connections-per-minute parameter is for limiting the number of connections that the program makes. This is designed to be used when you want to test the performance of other programs when the system is under load. The default is 24000 connections per minute. The messages-per-connection parameter specifies the maximum number of messages to download in a single POP session. The default is -1 (unlimited). The local-address parameter specifies which local IP address(es) are used to make the outbound connections. Specified in the same way as the remote address. This is good for testing LocalDirectors or other devices that perform differently depending on which source IP address was used. The -a command turns on all logging. All message data received will be logged. This will make it slow and it may not be able to saturate a fast Ethernet link... The -s switch specifies the percentage of connections which are to use TLS AKA SSL. Use 0 for no SSL, or 100 for always SSL, or any number in between. Default is 0. The -i switch specifies the percentage of IMAP connections (default is POP). The -b switch allows you to specify breakage strings. Currently the only option is for Qmail POP server which adds an extra blank line at the end of each message. -b qmail-pop means to not report this as an error. -d download-percentage[:delete-percentage] allows you to specify what percentage of the messages are downloaded and what percentage of the downloaded messages are deleted. Default is 100%. The -u switch causes the domain of user-names to be ignored. This allows you to have a single file with user-names and passwords which can be used by postal and rabid when using a server which doesn't accept a domain. By default postal will ignore the password field, rabid may or may not need the domain depending on the configuration of the POP server. The default is to use the domain (which is required if the same user is present in multiple domains), this switch causes the domain part to be stripped from the user-name field. The -z switch allows you to specify a debugging file base. From this base one file is created for each thread (with a ':' and the thread number appended), each file is used to log all IO performed by that thread for debugging purposes. The -Z switch is the same but creates a separate file for each connection as well with an attitional ':' appended followed by the connec- tion number. BUGS
Doesn't actually do SSL or IMAP yet. RETURN CODES
0 No Error 1 Bad Parameters 2 System Error, lack of memory or some other resource AUTHOR
This program, it's manual page, and the Debian package were written by Russell Coker <russell@coker.com.au>. AVAILABILITY
The source is available from http://doc.coker.com.au/projects/postal/ . See http://etbe.coker.com.au/category/benchmark for further information. SEE ALSO
postal(8),bhm(8) russell@coker.com.au 0.70 rabid(8)
All times are GMT -4. The time now is 04:35 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy