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This script provides administrators with an effective way to adjust and monitor Swarm logging, supporting both temporary and permanent log level changes for troubleshooting and performance monitoring.
Script Source Code
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#!/bin/bash
# Function to display usage information
usage() {
echo "Usage: $0 -d swarm_ip -p admin:password -i new_log_level [-t duration_in_seconds]"
echo " -d, --swarm_ip IP address of the Swarm API endpoint"
echo " -p, --credentials Credentials in the format admin:password"
echo " -i, --log.level New log level to set"
echo " -t, --time Duration in seconds to keep the new log level (optional)"
exit 1
}
# Function to format file size
format_size() {
local size=$1
if (( size >= 1073741824 )); then
echo "$(awk "BEGIN {printf \"%.1fGB\", $size/1073741824}")"
elif (( size >= 1048576 )); then
echo "$(awk "BEGIN {printf \"%.1fMB\", $size/1048576}")"
elif (( size >= 1024 )); then
echo "$(awk "BEGIN {printf \"%.1fKB\", $size/1024}")"
else
echo "${size}B"
fi
}
# Function to format duration
format_duration() {
local duration=$1
local hours=$((duration / 3600))
local minutes=$(( (duration % 3600) / 60 ))
local seconds=$((duration % 60))
printf "%02d:%02d:%02d" $hours $minutes $seconds
}
# Parse input arguments
while [[ "$#" -gt 0 ]]; do
case $1 in
-d|--swarm_ip) swarm_ip="$2"; shift ;;
-p|--credentials) credentials="$2"; shift ;;
-i|--log.level) new_log_level="$2"; shift ;;
-t|--time)
if [[ -n "$2" && "$2" != -* ]]; then
duration="$2"
shift
else
read -p "Enter duration in seconds: " duration
fi
;;
*) usage ;;
esac
shift
done
# Check if required arguments are provided
if [[ -z "$swarm_ip" || -z "$credentials" || -z "$new_log_level" ]]; then
usage
fi
# Validate log level
allowed_log_levels=(0 5 10 15 20 30 40 50)
if [[ ! " ${allowed_log_levels[@]} " =~ " ${new_log_level} " ]]; then
echo "Error: Invalid log level. Must be one of: ${allowed_log_levels[*]}"
exit 1
fi
# Retrieve the cluster name
clusterName=$(curl -u admin:caringo -sS "http://$swarm_ip:91/api/storage/clusters" | grep -oP '"name":\s*"\K[^"]+')
if [[ -z "$clusterName" ]]; then
echo "Failed to retrieve the cluster name. Please check your inputs."
exit 1
fi
# Convert duration to an integer if it is set
if [[ -n "$duration" ]]; then
if ! [[ "$duration" =~ ^[0-9]+$ ]]; then
echo "Error: Duration must be a positive integer value in seconds."
exit 1
fi
fi
# Display input parameters
echo "Swarm IP: $swarm_ip"
echo "Credentials: [hidden for security]"
echo "Cluster Name: $clusterName"
# Identify the log file location
log_file=""
if [[ -f "/var/log/caringo/castor.log" ]]; then
log_file="/var/log/caringo/castor.log"
elif [[ -f "/var/log/datacore/castor.log" ]]; then
log_file="/var/log/datacore/castor.log"
fi
# Display log file information
if [[ -n "$log_file" ]]; then
echo "Log file located at: $log_file"
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initial_size=$(stat -c%s "$log_file")
initial_size_formatted=$(format_size "$initial_size")
echo "Initial log file size: $initial_size_formatted" |
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else
echo "Warning: Log file not found in expected directories."
fi
# Get the current log level
echo ""
echo "Retrieving the current log level..."
current_log_level=$(curl -u "$credentials" -sS "http://$swarm_ip:91/api/storage/clusters/$clusterName/settings/log.level" | grep -oP '"value":\s*\K[0-9]+')
# Check if the current log level was retrieved successfully
if [[ -z "$current_log_level" ]]; then
echo "Failed to retrieve the current log level. Please check your inputs."
exit 1
fi
echo "New log level: $new_log_level"
echo "Current log level is $current_log_level."
# Check if the new log level is the same as the current log level
if [[ "$current_log_level" -eq "$new_log_level" ]]; then
echo ""
echo "Log level is already set to $new_log_level. No changes made."
exit 0
fi
# Update the log level using PUT
echo "Updating log level to $new_log_level..."
response=$(curl -u "$credentials" -sS -X PUT -H "Content-Type: application/json" \
"http://$swarm_ip:91/api/storage/clusters/$clusterName/settings/log.level" \
-d "{\"value\": $new_log_level}") |
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updated_log_level=$(echo "$response" | grep -oP '"value":\s*\K[0-9]+')
if [[ "$updated_log_level" -eq "$new_log_level" ]]; then
echo "Log level changed successfully from $current_log_level → $new_log_level."
else
echo "Failed to update log level. Response: $response"
exit 1
fi
# If duration is specified, wait and revert after the specified time
if [[ -n "$duration" && "$duration" -gt 0 ]]; then
echo "Keeping log level at $new_log_level for $duration second(s)..."
echo ""
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for ((i=duration; i>0; i--)); do
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countdown=$(format_duration $i) echo -ne "Countdown: $countdown |
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remaining...\r" sleep 1 |
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done |
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echo -e "\n\nTime's up! Reverting log |
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level back to $current_log_level..." # Revert to original log level response=$(curl -u "$credentials" -sS -X PUT -H "Content-Type: application/json" \ "http://$swarm_ip:91/api/storage/clusters/$clusterName/settings/log.level" \ -d "{\"value\": $current_log_level}") reverted_log_level=$(echo "$response" | grep -oP '"value":\s*\K[0-9]+') if [[ "$reverted_log_level" -eq "$current_log_level" ]]; then echo "Log level reverted successfully back to $current_log_level." else echo "Failed to revert log level. Response: $response" exit 1 fi else echo "Log level change is permanent until manually modified." fi |