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15%
Create a high availability VM with  DRBD9  and Reactor
07.10.2025
Home »  Archive  »  2025  »  Issue 89: Autom...  » 
Photo by Emma Simpson on Unsplash
is always a compromise, which is why Linstor lets you set up an arbiter node, also known as a quorum tiebreaker. It monitors both systems and is responsible for ensuring a quorum if the two cluster servers
15%
The PHP FastCGI process manager, PHP-FPM
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
© conceptw, 123RF.com
. However, an interpreter process can (accidentally) overwrite or destroy the opcode cache. PHP-FPM therefore monitors the cache and restarts the process automatically if something seems to be going haywire
15%
OpenStack workshop, part 1: Introduction to OpenStack
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
to manage and monitor all of the OpenStack core services (Figure 5). Figure 5: In addition to the agents for Keystone and Glance, all other Open
15%
pfSense firewall and router distribution
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
© Sergey Mironov, 123RF.com
that the firewall is currently monitoring are shown on a separate screen in Diagnostics | States . In addition to this, pfSense collects statistical data, such as the number of packets inspected. This data
15%
Zarafa on the Univention Corporate Server
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Andres Rodriguez, 123RF.com
.cfg, ical.cfg, licensed.cfg, monitor.cfg, ldap.cfg, and spooler.cfg – as well as the Postfix master.cf and maincf mail routing configuration files. Zarafa4ucs thus creates and provides certificates
15%
Finding cracks with Nmap, Portbunny, and Nessus
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Fotoflash, Fotolia.com
will respond with RST whether it is open or closed. The ACK scan is thus only useful for finding out whether a port is filtered. The trick is to monitor the window size, which tells you the cache usage status
15%
Installing and managing thedistributed GlusterFS filesystem
30.11.2025
Home »  Archive  »  2012  »  Issue 08: FreeNAS  » 
© Tetiana Pustovoitova, 123RF.com
which keeps clients from accessing the volume. Then, you can delete as follows: gluster volume delete examplevolume GlusterFS offers profiling and monitoring tools that help you quickly identify
15%
Building more efficient database applications with a graph database
30.11.2025
Home »  Archive  »  2012  »  Issue 08: FreeNAS  » 
© Jakub Krechowicz, 123RF.com
and respond to read operations. If the write master fails, the remaining group elects a new master. The Community edition of Neo4j is released under GPLv3. The Advanced edition includes monitoring capabilities
15%
Troubleshooting SELinux
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Sapsiwai, Fotolia
is currently active and monitoring/logging security events on the system, but permissive mode means that violations of the current security policy are being allowed to happen. This mode is often used for testing
15%
Galera Cluster for MySQL
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
© Noel Powell, fotolia.com
max 100 hard 0 weight 0 prio 0 sx 1245525 rx 1754046 Pen can save its status in an HTML file, which you can open with a browser or integrate in your monitoring infrastructure. ./penctl localhost

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