In my case krb5kdc ist running out of leck mich, cause the host system hasn't realy enough system resources.

The correct thing to do is adjust net.ipv4.tcp_max_syn_backlog to a high enough value that it no longer fires this warning.

You will probably also want to adjust the TCP stack in general to have more memory.

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Sometimes you'll need to setup a single point of authentification for e.g. to centralize stuff. 

I've found a nice Document, about Integrating Linux systems with Active Directory using Open Source Tools from 2017.

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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, e...

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short but sweet

firewall-cmd --permanent --zone=public --add-service=http
firewall-cmd --permanent --zone=public --add-service=https
firewall-cmd --reload

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common on recent harware changes
First boot into the rescue mode, then change to the boot directory

cd /boot

perform a copy of the current files as security purpose

cp -p initramfs-3.10.0-693.17.1.el7.x86_64.img initramfs-3.10.0-693.17.1.el7.x86_64.img.bak

build a new one

dracut -f -H initramfs-3.10.0-693.17.1.el7.x86_64.img 3.1...

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