Browsing Tag
SysAdmin
25 posts
Using multipath together with mdadm on Debian
Using multipath together with mdadm on Debian Linux requires some changes to the initrd image, otherwise mdadm might…
Managing LDAP passwords with Perl
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol. Many graphical interfaces are available…
Libvirt guest startup issue with AppArmor
With AppArmor enabled on Debian/ Ubuntu systems, starting up virtual machines with libvirt can cause startup failures if…
IPTables Logging in JSON with NFLOG and ulogd2
Logging with IPTables requires the use of an extra IPTables extension called NFLOG (https://manpages.debian.org/experimental/iptables/iptables-extensions.8.en.html#NFLOG) and a separate daemon…
Time based network access control on OpenBSD
Time based ACL (access control lists) features do not exist in BSD’s packet filter (PF). Having your network…
Block countries on OpenBSD using pf
Same as in the previous article, full countries can be easily blocked on OpenBSD firewall using the pf…
Block countries using IPtables and IPDeny.com
Certain server setups do not require access for all countries or just want to block certain countries since…
Install OpenBSD 6.0 on a Soekris net6501
Recently I bought a Soekris net6501 to build a home network in my new house.Things you need before…
OSSEC: building an OpenBSD package
OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring,…
Perl: Archive E-Mails in an IMAP Folder
IMAP folders are really because you can have your e-mails synchronized on multiple devices, without losing e-mails across…