Zimbra multi server – servers and services show as down in admin interface.

Solution for servers and services shown as down in zimbra admin console:

 

But they are actually up and running.

In a m ultiserver setup servers and services show as down in admin interface.

FACTS:
Rsyslog is not modified by zimbra installer.
In order for servers and services to look fine (when they are fine) in the admin console the logger module (syslog) is used.
By default rsyslog does not listen on tcp/udp and the Zimbra installer does not provide any changes to its configuration in order to make it happen.

So you need to open /etc/rsyslog.conf and uncomment following lines:

-------------------------------
# Provides UDP syslog reception
$ModLoad imudp
$UDPServerRun 514

# Provides TCP syslog reception
$ModLoad imtcp
$InputTCPServerRun 514
-------------------------------

Then restart rsyslog.

Also remember that you should check on the servers around (except the one supposed to receive the logs) that the correct log server is set. For this you can run as user zimbra:

zmprov gacf |grep zimbraLogHostname

This should return the hostname of the log recipient.

In case that is not correct, you can set it with:

zmprov mcf zimbraLogHostname example.com

Also, as root, you should run:

/opt/zimbra/libexec/zmsyslogsetup

This should make sure that the logserver you just set within zimbra is also used to reconfigure the rsysolg running on the system.

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Tube amplifier explained

I found these two videos really awesome in explaining how a tube operational amplifier works.

Bowers & Wilkins DM22 fix cabinet, filters, grill clothing

Found these speakers for a handful of euros so i bought them with the idea of cannibalise them for the tweeters to use for a pair of tweeterless DM5. But turns out that while the DM5 run a TW20 tweeter, the DM22 run a TW26, so the transplant is not going to happen for incompatible donor. What is going to happen instead is that I will sand a bit the cabinets because over time discolored in some places and probably have been toasted by sun rays in other spots making them a three-color thing.
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Geloso G3227-a vacuum tube amp, revive project

In the '80s a hospital in Den Helder, built in the '60, was renovated and one of the guys working at that renovation found, removed and took home this amplifier that i bought after almost 40 years. The amplifier was used for announcements on the microphone to be sent to all the speakers in the hospital.
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AKAI GX-260D

So, i found this beast and i bouhgt and I’m gonna clean it up and fix where needed (mainly capacitors i guess).

Some pictures

It perfectly works, or at least apparently, because, once arrived home i tested recording and it was not recording nor erasing anything at all, to the point that monitoring the tape would let you listen to the old content of the tape. So that was solved or temporarily verified as something that can be easily fixed by cleaning the contacts of the recording switches.
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postgresql FATAL: database system identifier differs between the primary and standby

This is due to two possible reasons:

  1. you did not do the initial filesystem sync (usually rsync)
  2. the recovery.conf contains errors

this page actually helped me

https://www.digitalocean.com/community/tutorials/how-to-set-up-master-slave-replication-on-postgresql-on-an-ubuntu-12-04-vps

Hope this helps

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ISP: ERROR Shibboleth.SSO.SAML2 [xx]: failed to decrypt assertion: XMLSecurity exception while decrypting: OpenSSL:SymmetricKey::decryptFinish – Out of range padding value in final block

The Sp (service provider) replaced the SSL certificate and the metadata used from the Idp are not up-to-date with the public key of the ISP.

This instead is the error message on MS ADFS:
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Apache 2.4 mod ldap authnz_ldap debian squeeze closed (connection lost)

It does not work out of the box.

You need to open and edit

/etc/ldap/ldap.conf

and add:

# TLS certificates (needed for GnuTLS)
TLS_CACERT /etc/ssl/certs/ca-certificates.crt

Let me know if this helped.

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Docker cheat-sheet

Docker is great for development, but also, it gives you the superpower of extremely small images to easily move around docker containers.

I need this for personal stuff, but I think it can be useful to others, so let’s share it.
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Letsencrypt is broken on Debian Jessie

You need backports,

so first add the jessie-backports to your favourite apt source.list

# Backport
deb http://http.debian.net/debian jessie-backports main

Then apt-get update, and then install back letsencrypt forcing the use of the backports:

apt-get install -t jessie-backports letsencrypt

That’s it,

Giuseppe