The above two errors will occur when bind(named) runs for the first time, unless you generate a valid base64 string and add it to named.conf:


Copy the above string and updatenamed.conf, section key ddns_keyas follows:

By default, RHEL kernel comes with IPv6 enabled. Since many of us don't need it, it's pointless to recompile the kernel just to disable IPv6.

To disable IPv6 on RHEL 5 add the following lines in /etc/modprobe.conf:


This will require a reboot.

Even if you add the user via useradd command, samba will still not see it returning the following messages:


Solution:


The reason for this is that samba uses different user/passwd files then the system.

Coming in contact for the first time with a server that fails to boot (from grub configuration errors) can be difficult, if you don't have a copy of the grub.conf at hand.

List available disks at grub prompt


List available disk partition at grub prompt

grub> find (hd0, -->TAB key
Partition num: 0, Filesystem type is ext2fs, partition type is 0x83
... ...

Troubleshooting GRUB requires knowing how grub works. Looking at a sample grub.conf file, we can see the commands that grub will accept at command line prompt.
node1# cat /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# ...

Vsftpd will work by default if SELinux is turned of or set to permissive mode.

For security paranoias (like me), SELinux in Enforced mode will not, by default, allow users to FTP to their home directories. This is because their security context will be:

system_u - system user
object_r - system object
default_t - default label

The above selinux security context will not allow vsftpd ...