Displaying 20 results from an estimated 5000 matches similar to: "Design details of high performance dovecot cluster"
2020 Jul 16
2
NFS vs Replication
Thank you all for replies!!!
Some missing infos...
- As load balancer I'm using a pair of keepalived with simple setup and
not the DNS
- Load balancer algorithm is "Weighted Least-Connection"
- About 20 domains and 3000 email
- I'm monitoring my backend servers with poolmon
- The backend servers are virtual machine (vmware) with datastore on
"all flash" storage
based
2013 Apr 19
2
Dovecot Failover
Hello,
Assuming we have two (low traffic) servers (on different data centers)
replicated using dsync, what is the best way to automatically direct
users to the main server when it is up and to the redundant one when the
main server is down?
Using DNS? I've seen that DNS-based failover has generally issues (for
example:
2017 Jul 21
4
Corrupt index files
I am running Dovecot IMAP on Linux, on a LizardFS storage cluster with
Maildir storage. This has worked well for most of the accounts for
several months.
However in the last couple of weeks we are seeing increasing errors
regarding corrupted index files. Some of the accounts affected are
unable to retrieve messages due to timeouts.
It appeared the problems were due to the accounts being accessed
2017 Jul 21
2
Corrupt index files
On Fri, Jul 21, 2017 at 08:50:16PM +0200, Robert Schetterer wrote:
> you should avoid this
> one solution is to use loadbalancers with persistance
We had been using a loadbalancer with persistence to reduce the
problems, and today I switched to everything running on a single box to
avoid any cross-node contention. Unfortunately, the problem still
happens, even when they were all running
2019 Apr 11
8
High availability of Dovecot
Hi, list,
I'm going to deploy postfix + dovecot + CephFS( as Mail Storage).
Basically I want to use two servers for them, which is kind of HA.
My idea is that using keepalived or Pacemaker to host a VIP, which
could fail over the other server once one is down. And I'll use Haproxy or
Nginx to schedule connections to one of those server based on source IP(
Session stickiness),
2015 Sep 11
1
Dovecot CalDAV server
* Niklaas Baudet von Gersdorff <niklaas at kulturflatrate.net>:
> On Fri, 11 Sep 2015 00:43:16 +0300
> Timo Sirainen <tss at iki.fi> wrote:
>
> > I've been once in a while over the years thinking about implementing
> > CalDAV (and CardDAV) to Dovecot. It might be time to start that soon.
> > Does anyone have any suggestions? So far my main goals would
2011 Nov 28
3
Fault tolerant architecture
Hi,
I'm new to this list and want your help.
I'm the mail admin for some domains in Rio de Janeiro - Brazil. Today we have only one machine running dovecot (imap+pop3) with local mail.
We are migrating to two virtual machines in kvm running in separate hosts. Then we have two main problems:
- How to share mail files to both dovecots? We've been thinking about NFS using local indexes.
2019 Apr 11
2
High availability of Dovecot
Gerald Galster via dovecot schrieb:
> mail1.yourdomain.com <http://mail1.yourdomain.com> IN A 192.168.10.1
> mail2.yourdomain.com <http://mail2.yourdomain.com>?IN A 192.168.20.1
>
> mail.yourdomain.com <http://mail.yourdomain.com> ?IN A 192.168.10.1
> mail.yourdomain.com <http://mail.yourdomain.com> ?IN A 192.168.20.1
>
>
> mail1/mail2 is for
2012 May 29
2
interesting stats pattern
Hey all, im experimenting with dovecot stats service, and graphing the result. My initial results are kind of interesting. Check out this graph showing connected sessions and users:
http://grab.by/dReu
At first I thought maybe one of our 35 imap servers was having issues sending data, but all individual servers show this patters. Here is a bunch of individual servers:
http://grab.by/dReC
2015 Jul 20
3
dovecot proxy/director and high availability design
I'm trying to determine which dovecot components to use and how to order them in the network path from client to mail store.
If I have say 1,000 users, all stored in MySQL (or LDAP) and have 4 mail stores, configured into 2, 2 node pods.
MS1 and MS2 are pod1 and are configured with replication (dsync) and host users 0-500. MS3 and MS4 are pod2 and are configured with replication between
2010 Nov 13
2
Is Dovecot Director stable for production??
Today I will try Dovecot Director for a setup using a Cluster Backend with
GFS2 on rhel5, my question is if is Director stable for use in production
for large sites, I know is mainly designed for NFS but I believe it will do
the job also for a cluster filesystem like GFS2 and should solve the mail
persistence problem with a node and locking issues.
I plan to add a layer behind a load balancer to
2020 Jul 16
2
NFS vs Replication
Il 16/07/20 12:40, Gerald Galster ha scritto:
>> Some missing infos...
>>
>> - As load balancer I'm using a pair of keepalived with simple setup and
>> not the DNS
>> - Load balancer algorithm is "Weighted Least-Connection"
>> - About 20 domains and 3000 email
>> - I'm monitoring my backend servers with poolmon
>> - The backend
2010 Feb 01
2
Dovecot design-question
Hi everybody,
we're currently in the process of drafting our new mailserver-setup.
Instead of a single-server-setup we'd like to have two equal servers
behind a loadbalancer like LVS and shared mailhomes on NFS.
We'd like to use dovecot for POP/IMAP, dovecot-deliver as LDA.
- It's probably the best idea to direct SMTP and POP/IMAP always to
the same server behind the
2015 Mar 02
6
IP drop list
Am 02.03.2015 um 18:56 schrieb Robert Schetterer:
> perhaps and i mean really "perhaps" go this way
>
> https://sys4.de/de/blog/2014/03/27/fighting-smtp-auth-brute-force-attacks/
>
> https://sys4.de/de/blog/2012/12/28/botnets-mit-rsyslog-und-iptables-recent-modul-abwehren/
>
> 45K+ IPs will work in a recent table
> i have them too but for smtp only like
>
>
2013 Aug 21
2
Dovecot tuning for GFS2
Hello,
I'm deploing a new email cluster using Dovecot over GFS2. Actually I'm
using courier over GFS.
Actually I'm testing Dovecot with these parameters:
mmap_disable = yes
mail_fsync = always
mail_nfs_storage = yes
mail_nfs_index = yes
lock_method = fcntl
Are they correct?
RedHat GFS support mmap, so is it better to enable it or leave it disabled?
The documentation suggest the
2012 Jul 22
1
Performance based choices
I've stopped trying to find a HowTo that suits me right away, and
instead I am happily trudging thru the Dovecot wiki, article by article.
I have right up front thought of one question, a general one, and some
detailed versions of that same question:
Generally, is there much general performance and reliability background
data available for making the basic choices?
Say: 1st.
delivery:
2013 Jan 16
4
Benchmarking: Dovecot vs Courier. Courier wins as POP3 server
Hi All,
I have compared Dovecot performance to Courier and it appears that as a POP3 server Dovecot is slower in 2 times but as an IMAP server it is faster in 1.5 times. The same node (16CPUs), testing time is 30 min, please see results and dovecot configs attached.
Benchmark software is MStone used by Sendmail Inc so is is quite reliable.
I do not see anything else to tweak in Dovecot to
2015 Sep 12
4
concerning dovecot settings for high volume server
hi
centos 6 64 bit
hex core processor with hyperthreading ie display shows 12 cores
16 gb ram
600 gb 15000 rpm drive
we are having around 4000 users on a server
i wish to allow 1500 pop3 and 1500 imap connections simultaneously.
need help regarding the settings to handle the above
imap-login, pop3-login
imap pop3 service settings
i recently i got an error
imap-login: Error: read(imap)
2016 Jan 27
6
HA firewall with tinc
I have 2 firewall in HA with keepalived. Can I use active the same tinc configuration on 2 firewalls ? using tun Interface with same ip on all 2 nodes is a problem ? tun device advertise itself on the network having an IP/MAC pairs (ARP) or the IP is only used by the system internally for routing so using the same configuration is right ? so one firewall be active, the other is passive. With this
2013 Jul 04
1
Failed to create SR with lvmoiscsi on xcp1.6[ [opterr=Logical Volume partition creation error [opterr=error is 5]]
Hello Experts,
When I try to create SR with lvm over iSCSI, it always failed, I list my xe command and debug info:
[root@xcp16 log]# xe sr-create host-uuid=a226200e-f7ff-4dee-b679-e5f114d1e465 content-type=user name-label=shared_disk_sr shared=true device-config:target=192.168.1.2 device-config:targetIQN=iqn.2013-07.example:shareddisk device-config:SCSIid=1IET_00010001 type=lvmoiscsi
The SR is