Switching to NSD and Dovecot

wonker

Active Member
Dec 5, 2007
32
6
58
Hello,

The latest cPanel Release 11.24.4-RELEASE now offers to change to NSD and dovecot.

What are the risks of doing so ? Is there a risk of mail not working, or sites not being accessible after doing this change?

I guess I will wait a bit before switching to make sure that it goes well and my customers will not notice a difference.
 

cPanelNick

Administrator
Staff member
Mar 9, 2015
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Dovecot will probably be a good choice to switch to for ALMOST everyone.

NSD will need to be a much more careful decision.
 

Voltar

Well-Known Member
Apr 30, 2007
267
0
168
Bakersfield, California
I switched of my servers to Dovecot recently and have seen better IMAP performance personally. I have a few mail accounts with 7000-10000 emails in them and Outlook seemed 'snappier' with Dovecot than it did with Courier.

As for NSD, I believe if you have a fair amount of IPs on your server, you might see worse performance with NSD than BIND.
 

cPanelNick

Administrator
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Mar 9, 2015
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I switched of my servers to Dovecot recently and have seen better IMAP performance personally. I have a few mail accounts with 7000-10000 emails in them and Outlook seemed 'snappier' with Dovecot than it did with Courier.

As for NSD, I believe if you have a fair amount of IPs on your server, you might see worse performance with NSD than BIND.
Note that dovecot is self optimizing so you will likely see better results 48 hours down the road instead of right away.
 

wonker

Active Member
Dec 5, 2007
32
6
58
Thakyou for your answers.

If I chose to switch to dovecot will I loose anything ? Will all the e-mails be kept and account settings too .. ?

As for NSD from what I understand it's good if you don't have many IP's (I don't have many) and don't need clusters (for the moment I don't).

Also with NSD I don't understand why you can't have a local IP address ... Some of my customers scripts use the localhost IP address, will these scripts still work if localhost IP is not specified ?
 

cPanelNick

Administrator
Staff member
Mar 9, 2015
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Thakyou for your answers.

If I chose to switch to dovecot will I loose anything ? Will all the e-mails be kept and account settings too .. ?

As for NSD from what I understand it's good if you don't have many IP's (I don't have many) and don't need clusters (for the moment I don't).

Also with NSD I don't understand why you can't have a local IP address ... Some of my customers scripts use the localhost IP address, will these scripts still work if localhost IP is not specified ?
The release notes here should answer these questions in much better detail then I can hope to describe here:

http://www.cpanel.net/products/cpwhm/releases/releasenotes/11.24/


Please note the separate notes for dovecot & nsd.
 

Gene Steinberg

Well-Known Member
May 26, 2007
163
3
168
Dovecot will probably be a good choice to switch to for ALMOST everyone.

NSD will need to be a much more careful decision.
Dovecot has been a disaster on my server. Every few hours, IMAP pegs memory at 100% and server load spikes tremendously. Only restarting the server fixes it. Yes, I have filed support tickets and your people are stumped. I've posted a message about it on the Dovecot mailing list, after contacting the author. If anyone has had similar problems, let me know.

FYI: My dedicated server has two quad-core AMD Opterons 2352 processors, 16GB RAM, and tons of disk space.

Our email load is light to moderate, and the server is using CentOS 5.2, the 64-bit version. cPanel is at RELEASE update mode, and the latest Easy Apache has been run.

Another server we use as a backup, a 32-bit Core2Duo setup with CentOS 4.7, never has a problem with the same configuration.

Right now, we feel we're in another universe when it comes to this situation.

Peace,
Gene