This document shows how to use a library of bash scripts to monitor a metadata query (MDQ) server.
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Skim some related documentation on GitHub: Monitoring an HTTP Resource
Install the bash library (see the bash library project page for details)
Configure the bash environment (see the bash library project page for details)
Testing a Single Entity
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The previous command outputs the following JSON file on stdout:
Default output
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| [
{
"requestInstant": "2018-04-12T21:20:52Z"
,
"friendlyDate": "April 12, 2018"
,
"curlExitCode": "0"
,
"responseCode": "200"
,
"sizeDownload": 9160
,
"speedDownload": 42670.000
,
"timeTotal": 0.214669
}
] |
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Limit the size of the JSON array to one object but output all available timing data:
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The previous command outputs the following JSON file on stdout:
All output
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| [
{
"requestInstant": "2018-04-12T21:24:06Z"
,
"friendlyDate": "April 12, 2018"
,
"curlExitCode": "0"
,
"responseCode": "200"
,
"sizeDownload": 9160
,
"speedDownload": 93969.000
,
"timeNamelookup": 0.005276
,
"timeConnect": 0.050664
,
"timeAppconnect": 0.000000
,
"timePretransfer": 0.050761
,
"timeStarttransfer": 0.096721
,
"timeTotal": 0.097478
}
] |
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For more information, consult the script’s inline help message:
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Set up a cron job for the previous test.
Cron job
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| #!/bin/bash
#######################################################################
#
# This script is intended to be used as a cron job.
#
# Configure the following environment variables:
# (also export TMPDIR if it doesn’t already exist)
#
# export BIN_DIR="/path/to/bin/"
# export LIB_DIR="/path/to/lib/"
# export CACHE_DIR="/path/to/http_cache/"
# export LOG_FILE="/path/to/bash_log.txt"
#
# Configure the following local variables:
#
# entityID=
# mdq_base_url=
# out_dir=
#
#######################################################################
# the name of this script
script_name=${0##*/}
# determine the HTTP location
location=$( $BIN_DIR/mdq_url.bash $mdq_base_url $entityID )
status_code=$?
if [ $status_code -ne 0 ]; then
echo "ERROR: $script_name: unable to compute location" >&2
exit 2
fi
# adjust the command line with options -n and -a as desired
$BIN_DIR/http_response_stats.bash -d $out_dir $location
status_code=$?
if [ $status_code -ne 0 ]; then
echo "ERROR: $script_name: unable to monitor location: $location" >&2
exit 3
fi
exit 0 |
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