IT

150 150 Roderick Derks

Zimbra: MTA rejects mail

Had configured my Zimbra MTA to use TLS. When using a new email client on my Windowsphone 8 operating system (yeah yeah, it’s my mobile for my job, I didn’t chose it myself) I was not able to send email via TLS and accepting self-signed-certificates. So… I had to disable TLS authentication only to be able to send email again from this client from an external network.

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150 150 Roderick Derks

Synology: disable folder authentication

Yes it is a bit of a security risk. I disbled the authetication of the Synology folders (samba shares) like this:

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150 150 Roderick Derks

ESXi 5.1 PXE boot setup and ks.cfg

A short overview about how to install an ESXi5 server via PXE boot using the following steps.

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150 150 Roderick Derks

Column count of mysql.db is wrong

Error on starting mysqld

# tail -f /var/log/mysqld.log

120807 14:48:55  InnoDB: Started; log sequence number 0 161811
120807 14:48:55 [ERROR] Column count of mysql.db is wrong. Expected 22, found 20. Created with MySQL 50***, now running 50***. Please use mysql_upgrade to fix this error.
120807 14:48:55 [ERROR] mysql.user has no `Event_priv` column at position 29
120807 14:48:55 [ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
120807 14:48:55 [Note] /usr/libexec/mysqld: ready for connections. Version: ‘5.*.**’  socket: ‘/var/lib/mysql/mysql.sock’  port: 3306  Source distribution
 

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150 150 Roderick Derks

Centreon: NTOP

How to install NTOP in Centreon, I started it but couldn’t finish it because of the incompatibility of NTOP module with the newer Centreon versions. Read more:

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150 150 Roderick Derks

Synology: howto measure disk io

By default there is no tool to measure disk IO. Bootstrap your Synology to make this possible and download the package dstat.

This is what I did on my DS411J

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150 150 Roderick Derks

Synology: snmp and disk temperatures

On synology

Check if this command works on your Synology:
smartctl -a /dev/hda -d ata | egrep "Model|Temp"

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150 150 Roderick Derks

Centreon: error while updating RRD graphs

Problem

It happended to me a few times that all of the Centreon graphs would not update anymore. And in /usr/local/centreon/log/centstorage.log I get a lot of these error messages:
2012-07-07 11:52:30 - ERROR while updating /var/lib/centreon/metrics/91.rrd at 1341654743 -> 0.00 : /var/lib/centreon/metrics/91.rrd: illegal attempt to update using time 1341654743 when last update time is 1341675817 (minimum one second step)

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150 150 Roderick Derks

NDO2DB and kernel parameters

What did I do:

# cat /proc/sys/kernel/msgmnb
65536
# cat /proc/sys/kernel/msgmax
65536
# cat /proc/sys/kernel/msgmni
1985

# echo 131072 > /proc/sys/kernel/msgmnb
and
# vi /etc/sysctl.conf
and adjust the appropriate value(s).

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150 150 Roderick Derks

Centreon and Nagios on Centos 6.2

A complete guide step by step on howto install Centreon on Centos 6.2. This is worth some money guys.

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