by Tim Weber Business editor, BBC News Cloud computing has been an information technology buzzword for many years. Now it is going mainstream. …. But what is cloud computing? In the simplest of terms, it is IT-as-a-Service. Instead of building your own IT infrastructure to host databases or software, a third party hosts them in its [...]
Hi,
I am working as Linux system administrator now I want to learn cloud computing too. I tried Googling but couldn't find appropriate information so thought to ask people here.
Can somebody suggest me correct path along with tutorials/PDF/HTMLs?
Really appreciate your help.
thx
Pras (1 Reply)
I work for a British based company.
We are looking for a cloud computing provider enabling us to use
HP on Itanium and HP hardware.
anyone know of any?
cheers. (0 Replies)
by Eric Knorr, InfoWorld.comSo many vendors have jumped on the cloud computing bandwagon, the phrase already risks jumping the shark. The problem is that “cloud computing” has two distinctly different meanings: The use of commercial Internet-based services, and the architecture for building and... (0 Replies)
Tim Bass
Thu, 15 Nov 2007 23:55:07 +0000
*I predict we may experience less*debates*on the use of the term “event cloud”*related to*CEP in the future, now that both IBM and Google* have made announcements about “cloud computing” and “computing cloud”, IBM Turning Data Centers Into ‘Computing... (0 Replies)
sha512hmac(8) System Administrator's Manual sha512hmac(8)NAME
sha512hmac - compute and check HMAC values
SYNOPSIS
sha512hmac [OPTIONS] [-u | -k keyfile | -K key] [-c file [-q] | file [...] ]
DESCRIPTION
The sha512hmac command can compute and/or verify HMAC and unkeyed checksum values for the contents of files. Variations such as
sha384hmac, sha256hmac, and sha1hmac all operate similarly except that they use different digest algorithms.
SELF-TEST
As a safety measure, the tool will always attempt to verify a previously- computed HMAC over itself with the contents of a second file
(sha512hmac.hmac for sha512hmac, and a similarly-named file for each variation) before processing any other files, and will exit with an
error if the second file either cannot be read or does not match the computed value.
OPTIONS -c Check that the HMAC values and names listed in the specified file(s) are correct for the files which are available. The format of
the files should match the output which the tool produces when computing the values: a hex-encoded HMAC value and then a filename,
separated by whitespace.
-q Suppress any output when checking values.
-d cfgdir
Specify the configuration directory to be used by the NSS library. The default location is /etc/pki/nssdb.
-h algorithm
Generate the HMAC value using a non-default hashing algorithm. The default is determined by the name used to invoke the tool
(sha1hmac, sha256hmac, etc.). If no default can be derived this way, the default setting will be sha512. Specify help or another
invalid value to obtain a list of recognized algorithms.
-u Generate an unkeyed checksum instead of an HMAC. The output produced by the tool should then be comparable to that of sha1sum and
related tools.
-k filename
Use the contents of the specified file as the secret key used in computing the HMAC values. If no key file or text is specified, a
hard-coded default value is used. This option should always be used.
-K text
Use the text of the argument as the secret key used in computing the HMAC values. If no key file or text is specified, a hard-coded
default value is used.
-b Process file contents in binary mode, marking output as such by prefixing filenames with *. This option is not expected to have any
other meaningful effect.
-t bits
Truncate HMAC values to a given length when computing or verifying them.
-S Generate an HMAC over the tool itself and output it on standard out. This is a bootstrapping option which is not expected to be
used.
-P Attempt to pass all input files through prelink -y before processing their contents. The tool always attempts to do so when comput-
ing or performing a self-check.
EXAMPLES
Example output from sha1hmac, for files on the developer's system:
e64db5e8a9b8a40091e5302fa4de0bfc6c5d19d0 /etc/passwd
e7d93a2c70ec4d7720c6f2b033c1e5ea19f2d677 /etc/group
d732d6df77114ea6b81a43d64655f86b1e5ee925 /etc/services
ad92162bef979054a75d1f3510e6b05902bec641 /etc/hosts
SEE ALSO fipshmac(1), fipscheck(1), prelink(8)BUGS
Probably, but let's hope not. If you find any, please either report them in the bug database at http://bugzilla.redhat.com/ against the
"hmaccalc" component, or in the trac instance at https://fedorahosted.org/hmaccalc/.
AUTHOR
Nalin Dahyabhai <nalin@redhat.com>
hmaccalc 0.9.13 2009/03/19 sha512hmac(8)
