UnixPB: Add Docker Overlay Check Plugin Script For Nagios (adoptium#3825

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* UnixPB: Add Docker Overlay Check Script For Nagios

* Update ansible/playbooks/AdoptOpenJDK_Unix_Playbook/roles/Nagios_Plugins/tasks/additional_plugins/check_docker_overlay2_size.sh

Co-authored-by: Stewart X Addison <[email protected]>

* Update ansible/playbooks/AdoptOpenJDK_Unix_Playbook/roles/Nagios_Plugins/tasks/additional_plugins/check_docker_overlay2_size.sh

Co-authored-by: Stewart X Addison <[email protected]>

---------

Co-authored-by: Stewart X Addison <[email protected]>

ansible/playbooks/AdoptOpenJDK_Unix_Playbook/roles/Nagios_Plugins/tasks/additional_plugins/check_docker_overlay2_size.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# Nagios plugin to check the size of /var/lib/docker/overlay2
+# Allows passing thresholds as parameters
+
+# Default thresholds (in GB)
+DEFAULT_WARN_THRESHOLD=20
+DEFAULT_CRIT_THRESHOLD=40
+
+# Folder to check
+TARGET_DIR="/var/lib/docker/overlay2/"
+
+# Function to display usage
+usage() {
+    echo "Usage: $0 -w <warn_threshold_in_GB> -c <crit_threshold_in_GB>"
+    echo "  -w: Warning threshold in GB (default: $DEFAULT_WARN_THRESHOLD)"
+    echo "  -c: Critical threshold in GB (default: $DEFAULT_CRIT_THRESHOLD)"
+    exit 3
+}
+
+# Parse command-line arguments
+while getopts "w:c:" opt; do
+    case $opt in
+        w) WARN_THRESHOLD=$OPTARG ;;
+        c) CRIT_THRESHOLD=$OPTARG ;;
+        *) usage ;;
+    esac
+done
+
+# Set default thresholds if not provided
+WARN_THRESHOLD=${WARN_THRESHOLD:-$DEFAULT_WARN_THRESHOLD}
+CRIT_THRESHOLD=${CRIT_THRESHOLD:-$DEFAULT_CRIT_THRESHOLD}
+
+# Convert GB to bytes
+WARN_THRESHOLD_BYTES=$((WARN_THRESHOLD * 1024 * 1024 * 1024))
+CRIT_THRESHOLD_BYTES=$((CRIT_THRESHOLD * 1024 * 1024 * 1024))
+
+# Check if the directory exists
+if [[ ! -d "$TARGET_DIR" ]]; then
+    echo "CRITICAL: Directory $TARGET_DIR does not exist."
+    exit 2
+fi
+
+# Get the size of the folder in bytes
+FOLDER_SIZE_BYTES=$(du -sb "$TARGET_DIR" 2>/dev/null | awk '{print $1}')
+
+# Handle error if du fails
+if [[ -z "$FOLDER_SIZE_BYTES" ]]; then
+    echo "CRITICAL: Failed to determine the size of $TARGET_DIR."
+    exit 2
+fi
+
+# Convert size to GB for display
+FOLDER_SIZE_GB=$(echo "scale=2; $FOLDER_SIZE_BYTES / (1024 * 1024 * 1024)" | bc)
+
+# Determine Nagios status
+if (( FOLDER_SIZE_BYTES > CRIT_THRESHOLD_BYTES )); then
+    echo "CRITICAL: $TARGET_DIR size is ${FOLDER_SIZE_GB}GB (Threshold: >${CRIT_THRESHOLD}GB)"
+    exit 2
+elif (( FOLDER_SIZE_BYTES > WARN_THRESHOLD_BYTES )); then
+    echo "WARNING: $TARGET_DIR size is ${FOLDER_SIZE_GB}GB (Threshold: >${WARN_THRESHOLD}GB)"
+    exit 1
+else
+    echo "OK: $TARGET_DIR size is ${FOLDER_SIZE_GB}GB (Threshold: <=${WARN_THRESHOLD}GB)"
+    exit 0
+fi

ansible/playbooks/AdoptOpenJDK_Unix_Playbook/roles/Nagios_Plugins/tasks/main.yml

@@ -107,3 +107,9 @@
     src: roles/Nagios_Plugins/tasks/additional_plugins/check_container_spaces.sh
     dest: /usr/local/nagios/libexec/check_container_spaces.sh
     mode: 0755
+
+- name: Copy Docker Overlay2 Size Plugin
+  copy:
+    src: roles/Nagios_Plugins/tasks/additional_plugins/check_docker_overlay2_size.sh
+    dest: /usr/local/nagios/libexec/check_docker_overlay2_size.sh
+    mode: 0755