pmnsdel - delete a subtree of names from the Performance Co-Pilot PMNS
$PCP_BINADM_DIR/pmnsdel [
-?] [
-n namespace]
metricpath [...]
pmnsdel removes subtrees of names from a Performance Metrics Name Space
(PMNS), as used by the components of the Performance Co-Pilot (PCP).
Normally
pmnsdel operates on the default Performance Metrics Name Space
(PMNS), however if the
-n option is specified an alternative namespace
is used from the file
namespace.
The default PMNS is found in the file
$PCP_VAR_DIR/pmns/root unless the
environment variable
PMNS_DEFAULT is set, in which case the value is
assumed to be the pathname to the file containing the default PMNS.
The metric names to be deleted are all those for which one of the
metricpath arguments is a prefix in the PMNS, see
PMNS(5).
All of the files defining the PMNS must be located within the directory that
contains the root of the PMNS, and this would typically be
$PCP_VAR_DIR/pmns for the default PMNS, and this would typically imply
running
pmnsdel as root.
Provided some initial integrity checks are satisfied,
pmnsdel will update
the necessary PMNS files. Should an error be encountered the original
namespace is restored. Note that any PMNS files that are no longer referenced
by the modified namespace will not be removed, even though their contents are
not part of the new namespace.
The available command line options are:
-
-n pmnsfile,
--namespace=pmnsfile
- Load an alternative Performance Metrics Name Space
(PMNS(5)) from the file pmnsfile.
-
-?, --help
- Display usage message and exit.
Once the writing of the new
namespace file has begun, the signals SIGINT,
SIGHUP and SIGTERM will be ignored to protect the integrity of the new files.
- $PCP_VAR_DIR/pmns/root
- the default PMNS, when the environment variable
PMNS_DEFAULT is unset
Environment variables with the prefix
PCP_ are used to parameterize the
file and directory names used by PCP. On each installation, the file
/etc/pcp.conf contains the local values for these variables. The
$PCP_CONF variable may be used to specify an alternative configuration
file, as described in
pcp.conf(5).
pmnsadd(1),
pmnsmerge(1),
pcp.conf(5),
pcp.env(5)
and
PMNS(5).