Auto-update mechanism – Amer Networks E5Web GUI User Manual
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It can be advisable to make a full system backup before performing a system upgrade. If there is
a requirement to wind back the upgrade, the system backup file can be uploaded as it contains
both the original configuration and the original pre-upgrade version of cOS Core.
Upgrades in a Virtual Environment
When running cOS Core in a virtual environment under a VMware or KVM, upgrades of cOS Core
can be done just as they are done on a single physical computer. It is not necessary to create a
new virtual machine for a new version.
Note: Checking the Dynamic High Buffers setting
It is recommended that the advanced setting Dynamic High Buffers is enabled after an
upgrade since the cOS Core memory allocations may have changed. A hardware restart
is required for this to take effect and this can be achieved using the CLI command:
Device:/> shutdown
In some scenarios support personnel might recommend disabling Dynamic High
Buffers and setting High Buffers to a higher fixed value. Where cOS Core is handling
tens of thousands of simultaneous connections then it may be necessary to manually
set a value above the automatic value. However, if the HighBuffers value is set too high
this may adversely affect throughput.
See Section 12.10, “Miscellaneous Settings” for a full explanation of these settings.
New Release Notifications
Clavister maintains an RSS feed of announcements that can be subscribed to at:
.
It is recommended to subscribe to this feed in order to receive notifications when new releases
of cOS Core versions are available for download and installation. Alternatively, announcements
can be read directly from the Clavister forums which can be found at:
2.6.2. Auto-Update Mechanism
A number of the cOS Core security features rely on external servers for automatic updates and
content filtering. The Intrusion Prevention and Detection system and Anti-Virus modules require
access to updated signature databases in order to provide protection against the latest threats.
To facilitate the Auto-Update feature Clavister maintains a global infrastructure of servers
providing update services for Clavister Security Gateways. To ensure availability and low
response times, cOS Core employs a mechanism for automatically selecting the most
appropriate server to supply updates.
For more details on these features see the following sections:
•
Section 6.5, “Intrusion Detection and Prevention”
•
Section 6.4, “Anti-Virus Scanning”
•
Section 6.3, “Web Content Filtering”
Chapter 2: Management and Maintenance
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