We were having issues with slave zones configuration on Ubuntu Server 14.04. Our slave zone was configured like this:
zone "example.com" {
type slave;
file "/etc/bind/zones/slaves/example.com";
masters {
1.2.3.4;
};
};
Upon bind9 service restart we were experimenting permission denied issues after zone transfer. System logs showed this:
May 5 09:34:20 server named[1163]: dumping master file: /etc/bind/zones/slaves/tmp-uPqJQyCpIG: open: permission denied
May 5 09:34:20 server kernel: [149149.868459] type=1400 audit(1430832860.217:27): apparmor="DENIED" operation="mknod" profile="/usr/sbin/named" name="/etc/bind/zones/slaves/tmp-uPqJQyCpIG" pid=1165 comm="named" requested_mask="c" denied_mask="c" fsuid=103 ouid=103
We couldn't fix this by changing file & folder permissions, and then we realised that apparmor was the one denying us write access to /etc/bind/zones/slaves folder.
We fix this by placing our slave files folder somewhere else. We ended up picking /var/cache/bind/slaves folder.
Students and professionals working on Networking Projects for Final Year can benefit from this real-world example, as it highlights DNS server deployment, zone transfers, Linux administration, and effective troubleshooting techniques commonly encountered in enterprise network environments.
ReplyDeleteThe discussion also emphasizes the importance of securing infrastructure services without disrupting their functionality. Exploring Network Security Projects for Final Year provides deeper insights into access control, secure service configuration, and protecting critical network resources while maintaining reliable system operations.
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