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SOLR-16644: Only warn entropy on Linux #2000

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Oct 10, 2023
Merged

SOLR-16644: Only warn entropy on Linux #2000

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SOLR-16644: Only warn entropy on Linux
janhoy Oct 10, 2023
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janhoy Oct 10, 2023
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21 changes: 12 additions & 9 deletions solr/bin/solr
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Expand Up @@ -1913,26 +1913,29 @@ function start_solr() {
# shellcheck disable=SC2086
nohup "$JAVA" "${SOLR_START_OPTS[@]}" $SOLR_ADDL_ARGS -Dsolr.log.muteconsole \
-jar start.jar "${SOLR_JETTY_CONFIG[@]}" $SOLR_JETTY_ADDL_CONFIG \
1>"$SOLR_LOGS_DIR/solr-$SOLR_PORT-console.log" 2>&1 & echo $! > "$SOLR_PID_DIR/solr-$SOLR_PORT.pid"
1>"$SOLR_LOGS_DIR/solr-$SOLR_PORT-console.log" 2>&1 & echo $! > "$SOLR_PID_DIR/solr-$SOLR_PORT.pid"
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# Get the current entropy available
entropy_avail=$(cat /proc/sys/kernel/random/entropy_avail)
# Check and warn about low entropy on Linux systems
if [ -e /proc/sys/kernel/random ]; then
# Get the current entropy available
entropy_avail=$(cat /proc/sys/kernel/random/entropy_avail)

# Get the pool size
pool_size=$(cat /proc/sys/kernel/random/poolsize)
# Get the pool size
pool_size=$(cat /proc/sys/kernel/random/poolsize)

# Check if entropy is available and pool size is non-zero
if [[ $entropy_avail -gt 0 && $pool_size -ne 0 ]]; then
# Check if entropy is available and pool size is non-zero
if [[ $entropy_avail -gt 0 && $pool_size -ne 0 ]]; then
# Compute the ratio of entropy available to pool size
ratio=$(awk -v ea="$entropy_avail" -v ps="$pool_size" 'BEGIN {print (ea/ps)*100}')

# Check if the ratio is less than 25%
if (( $(echo "$ratio < 25" | bc -l) )); then
echo "Warning: Available entropy is low. As a result, use of the UUIDField, SSL, or any other features that require"
echo "RNG might not work properly. To check for the amount of available entropy, use 'cat /proc/sys/kernel/random/entropy_avail'."
fi
else
else
echo "Error: Either no entropy is available or the pool size is zero."
fi
fi

# no lsof on cygwin though
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