Feb 16 17:45:08 moshpit systemd[1]: Starting unifi...
Feb 16 17:45:24 moshpit unifi[908]: Feb 16, 2019 17:45:24 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request:

Solution is quite simple, you have to update your Java Installation to get rid of this issue.

This Version will work

pi@moshpit:~ $ java -version
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) Client VM (build 25.201-b09, mixed mode)

Stop the Service

sudo systemctl stop unifi

Enter the Java Directory

cd /usr/lib/jvm

Backup old Java

sudo mv <oldversion_dir>/ backup_oldjava

Copy the new Java into the old Directory or simple use a symbolic link 

sudo cp -rf /usr/java/jdk1.8.0_201/ <javadir>

Start the Service again

sudo systemctl start unifi

 

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login to your mysql instance as root user and then use this commands to active mysql query logs

SET GLOBAL log_output = 'FILE';
SET GLOBAL general_log_file = 'nameoflogfile';
SET GLOBAL general_log = 'ON';

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is about a locale issue during a foreman setup on CentOS 7.

locale environment variables were bad; continuing with LANG=C

In my case the output of locale -a showed en_US.utf8 but the output of env and the line line in /etc/locale.conf reads different.
en_US.UTF-8 which seams to be wrong or not translated correctly.
Long Story short, either export the correct settings or update the /etc/locales.conf file so that it read like this for example

LC_ALL=en_US.utf8
LANG=en_US.utf8
LANGUAGE=en_US.utf8

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I've seen this message in a vsftpd Logfile.
Default vsftpd limits the connection from one IP Address to 50.
Solution is to add an unlimited value which will be 0 or a higher number of connections as needed.

max_per_ip=0

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Convert vmdk direct to an empty attached Storage

qemu-img convert path_and_name_of_vmdk_file -O raw /dev/devicename

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