[Users] June 1, 2021 Zeta Alliance Conference Call Summary

[Randy Leiker]

Hello Zeta Alliance Community, 

Here is a summary of this week’s conference call. A few brief reminders: 


    * Conference calls are every Tuesday and open to all using either the FreeConferenceCall.com VoIP app or via a dial-in number: [ https://www.freeconferencecall.com/wall/zetalliance | https://www.freeconferencecall.com/wall/zetalliance ] 
    * Each week’s call agenda can be found at: [ https://drive.google.com/drive/folders/1xDyBJFjnfZYxuXJHiDzsXjjMuGGtIl7J | https://drive.google.com/drive/folders/1xDyBJFjnfZYxuXJHiDzsXjjMuGGtIl7J ] 
    * A copy of each week’s summary is also posted to the Zimbra Forums: 
        * All Prior Months: [ https://forums.zimbra.org/viewforum.php?f=9 | https://forums.zimbra.org/viewforum.php?f=9 ] 
        * May 2021 : [ https://forums.zimbra.org/viewtopic.php?f=9&t=69570 | https://forums.zimbra.org/viewtopic.php?f=9&t=69570 ] 
        * June 2021: [ https://forums.zimbra.org/viewtopic.php?f=9&t=69677 | https://forums.zimbra.org/viewtopic.php?f=9&t=69677 ] 
    * Constructive feedback on these call summaries is always welcome. 

June 1 , 2021 

Upcoming 8.8.15 Patch 22 and 9.0 Patch 15 
Mark S. asked if the next patches were coming out the week of May 31st. John H. said Zimbra is currently projecting either late in the week of May 31st or the following week. Mark said that the preview release notes for Zimbra partners suggest the patches will change the Zimbra Video Server status from beta to generally available and said he is looking forward to trying it out to see if it makes video calls with Zimbra Connect more scalable than using a standalone TURN server. 

ARC Support In Zimbra 
Noah P. said he has been recently working on implementing DKIM ( https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail ) in Zimbra and asked if anyone has implemented ARC support ( https://en.wikipedia.org/wiki/Authenticated_Received_Chain ) in Zimbra for re-signing messages. He said he recalled a Postfix Milter being discussed on a Zeta Alliance call last February 2020 ( http://forums.zimbra.org/viewtopic.php?f=9&t=67726#p295876 ) that he thought may make ARC support available. Mark S. said that he has not found that forwarding of DKIM signed messages has resulted in false positives for his Zimbra users and thinks that most email providers have found this to be a typical use case, so they are allowing it, even if it violates a DMARC policy (https://en.wikipedia.org/wiki/DMARC ). Randy L. said that he thinks John W. at Xmission may have been working on implementing ARC support in Zimbra and suggested that Noah may want to send him a note to see if he had any additional information to share. 

Unexpectedly Large Zimbra Log Files 
Jorge C. said that he recently migrated from a single Zimbra server install to a multi-server install as described in the Zimbra Administration guide. Post-migration, he said he encountered a problem where his zimbra.log file grew exponentially from 500 MB to 3 GB in about 3 hours. Similarly, his Zimbra stats log file grew to 27 GB in the same time period. He opened Zimbra support case # 01173606 and was assigned Zimbra bug ID: ZBUG-2234. John H. said this bug is an open issue and is caused by an incorrect virtual host name entry in Jorge’s /etc/rsyslog.d/60-zimbra.conf file. Jorge said he now has the following entries in his 60-zimbra.conf file: 

local0.* -/var/log/zimbra.log 
local1.* -/var/log/zimbra-stats.log 
auth.* -/var/log/zimbra.log 
mail.* -/var/log/zimbra.log 

But previously had virtual host names listed like: 

local0.* @hostname.domain 
local1.* @hostname.domain 
auth.* @hostname.domain 
local0.* -/var/log/zimbra.log 
local1.* -/var/log/zimbra-stats.log 
auth.* -/var/log/zimbra.log 
mail.* @hostname.domain 
mail.* -/var/log/zimbra.log 

Jorge explained that the virtual host lines were present when he had a single server Zimbra install and it did not have the rapid log file growth issue at that time, so he was not sure why this likewise did not also work in a multi-server install. Matthew F. asked which of the Zimbra servers has the Zimbra logger service running, as he wondered if Jorge had inadvertently setup two servers running the logger service, when there should only be a single server running the logger service. Jorge said he did not know the answer to Matthew’s question. Mark S. said that he has found that Zimbra patches will occasionally force syslogging in to a non-functional state, and in those instances that running the /opt/zimbra/libexec/zmsyslogsetup utility ( https://wiki.zimbra.com/wiki/Configuring-Logger-Host ) followed by a “service syslog restart” command helps bring things back in to an operational state. Mark added that he finds syslogging over UDP does not seem reliable, where some network switches do not handle it well, and suggested using TCP logging by changing: 

local0.* @@hostname.domain 

Then running: “service rsyslog restart”. Next, in /etc/rsyslog.conf set: 

# provides UDP syslog reception 
module(load="imudp") 
input(type="imudp" port="514") 

# provides TCP syslog reception 
#module(load="imtcp") 
#input(type="imtcp" port="514") 

Uncomment the TCP related lines above then do another restart of the rsyslog service. 


Randy Leiker ( randy at skywaynetworks.com ) 
Skyway Networks, LLC 
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