Christian Berding
Author's posts
Oct 27 2021
Debian: unattended-upgrades + needrestart
The purpose of unattended-upgrades is to keep the computer current with the latest security (and other) updates automatically.
If you plan to use it, you should have some means to monitor your systems, such as installing the apt-listchanges package and configuring it to send you emails about updates. And there is always …
Oct 27 2021
Debian: apt-cacher-ng
A caching proxy. Specialized for package files from Linux distributors, primarily for Debian (and Debian based) distributions but not limited to those.
Oct 27 2021
Debian: fail2ban + nftables
Fail2ban scans log files and bans IPs that show the malicious signs — too many password failures, seeking for exploits, etc. Generally Fail2Ban is then used to update firewall rules to reject the IP addresses for a specified amount of time, although any arbitrary other action (e.g. sending an email) could also be configured. Out …
Oct 27 2021
Debian: Apache + RemoteIP
Often or not someone may place a web farm behind a loadbalancer and not get appropriate remote ip address logging information on the Apache log files. Following entry will describe how to configure Apache to log with the X-Forwarder-For HTTP-Header.
Oct 27 2021
Debian: Apache + Mod-Security + fail2ban
ModSecurity was originally designed for Apache web server. It could work with Nginx before version 3.0 but suffered from poor performance. ModSecurity 3.0 (aka libmodsecurity) was released in 2017. It’s a milestone release, particularly for Nginx users, as it’s the first version to work natively with Nginx. The caveat of ModSecurity 3 is that it …
Mar 06 2021
VMware WS1XS – Cluster “down” / Synchronize Nodes
In certain scenarios VMware Workspace One access can be left in a unsynchronized state. Following procedure will allow for making sure WS1XS is fully operational again and healthy. This procedure is a shortening of https://kb.vmware.com/s/article/75080 which is the official procedure.