So this one is pretty simple. However, I found a lot of misinformation along the way, so I figured that I would jot the proper (and most simple) process here.

Symptoms: a RHEL (or variant) VM that takes a very long time to boot. On the VM console, you can see the following output while the VM boot process is stalled and waiting for a timeout. Note that the message below has nothing to do with cloud init, but its the output that I have most often seen on the console while waiting for a VM to boot.

[106.325574} random: crng init done

Aug 10 2012

Free EL YUM Repositories

If you are using some flavor of an Enterprise Linux, eventually will get tired of download rpm packages from Here BTW, is a really great page when you don't have access to FTP services (damn telecom/security guys).

And eventually, you will need to have repositories on your server to solve the dependencies.
Here are some free repository provided by Oracle for FREE, but of course, with NO SUPPORT.

Jul 4 2012

New user created as:

groupadd mygroup
useradd -s /bin/bash -g myuser -m -k /dev/null myuser

When trying to log in:

[root@vserver~]# su - myuser
su: /bin/bash: Permission denied

Solution:

[root@vserver~]# chmod 755 /bin
[root@vserver~]# su - myuser
[myuser@vserver~]$
Dec 21 2011

First, Check you squid.conf file and locate the location of you cache directory, you should have line starting with "cache_dir"

1) Shutdown your squid server
squid -k shutdown

2) Remove the cache directory
rm -r /squid/cache/*

3) Re-Create the squid cache directory
squid -z

4) Start the squid

When we work with hardened kernels and tools like grsecurity and PaX, we faced to problems like:

Just modify the data file to look like this one.

evo ~ # vi /bla/bla/bla/tinydns-IPX/root/data
...
...
...
# myowndomain.com's MX Servers
@myowndomain.com::aspmx.l.google.com.:10:86400
@myowndomain.com::alt1.aspmx.l.google.com.:20:86400
@myowndomain.com::alt2.aspmx.l.google.com.:20:86400
@myowndomain.com::aspmx2.googlemail.com.:30:86400
@myowndomain.com::aspmx3.googlemail.com.:30:86400
@myowndomain.com::aspmx4.googlemail.com.:30:86400
@myowndomain.com::aspmx5.googlemail.com.:30:86400
...
...
...
Jun 9 2011

Edit the file /boot/grub/device.map to look like this

(fd0) /dev/fd0
(hd0) /dev/cciss/c0d0
.....

Run grub like this:

hercules ~ # /sbin/grub --batch --device-map=/boot/grub/device.map --config-file=/boot/grub/grub.conf --no-floppy

grub shell:

grub> root (hd0,0)
grub> setup (hd0)
grub> quit
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