Quick round up of the Spacewalk client configuration files :
The main configuration file is : /etc/sysconfig/rhn/rhncfg-client.conf
This file makes use of variables whose values are located in /etc/sysconfig/rhn/up2date
The server identity in Spacewalk is located in the XML file /etc/sysconfig/rhn/systemid
Two links for an in-depth explanation regarding Red Hat backporting security fixes process as well as compatibility between Red Hat security advisories and Mitre CVEs.
Backporting Security Fixes
Red Hat and CVE compatibility
Red Hat provides free access to two databases for errata and for CVE referenced in Red Hat products :
Red Hat Product Errata database
Red Hat CVE Database
Per Fail2ban main page, Fail2ban is the de facto tool to have to monitor malicious access attempts on your server and ban source IPs if need be.
The 2 presentations presents Fail2Ban’s history and features in a very-well manner :
Fail2Ban – Keep your boxes skiddie-free
Fail2ban : from personal to community-driven
Github’s project page
The warning message below has been displayed after upgrading Debian testing :
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915
This issue has been referenced in the Debian bug tracking system : #857997
For now, this package does not provide the latest version of Kabylake GuC (9.14) and Broxton GuC (8.7) firmwares.
To remove this warning message, as a workaround, just download them and copy the blob files into the directory /lib/firmware/i915.
Finally, rebuild your initramfs :
update-initramfs -k `uname -r`-u
Upgrade a rpm package on a couple of servers with a quick one-liner in Ansible :
ansible all -b --ask-become-pass -m yum "name=bash state=latest"
servers_list is the text file listing your servers.
Using the ANSIBLE_INVENTORY variable overrides the use of a generate inventory.
This one-liner makes use of the yum Ansible module.
Running sudo commands is possible with these options -b and –ask-become-pass