init autoresizer

scripts/lvmthin_autoresize.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+# This script checks the usage of LVM thin volumes and resizes them if they are over a certain threshold.
+# Italso updates the LXC configuration file to reflect the new size of the disk.
+# To use the script with VMs instead of LXC containers, replace the 'pct' commands with 'qm' commands.
+
+# Define constants
+THRESHOLD=90
+RESIZE_FACTOR=1.1
+LOG_FILE="/var/log/lvm_resize.log"
+
+# Function to log messages
+log_message() {
+    echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" | tee -a "$LOG_FILE"
+}
+
+# Function to resize a logical volume and update filesystem
+resize_lv() {
+    local LV_PATH="$1"
+    local LV_NAME="$(echo "$LV_PATH" | awk -F '/' '{print $NF}')"
+    local VG_NAME="$(echo "$LV_PATH" | awk -F '/' '{print $(NF-1)}')"
+    local CURRENT_SIZE_GB=$(lvs --noheadings --units g -o LV_SIZE "$VG_NAME/$LV_NAME" | awk '{print int($1)}')
+    local NEW_SIZE_GB=$(echo "$CURRENT_SIZE_GB * $RESIZE_FACTOR / 1" | bc)
+    NEW_SIZE_GB=$(echo "$NEW_SIZE_GB/1" | bc) # Ensure new size is an integer number of GB
+    local CONTAINER_ID=$(echo "$LV_PATH" | grep -oP 'vm-\K[0-9]+(?=-disk)')
+
+    log_message "Stopping container ID $CONTAINER_ID for resize operation..."
+    if ! pct stop $CONTAINER_ID; then
+        log_message "Failed to stop container ID $CONTAINER_ID. Aborting resize operation."
+        return 1
+    fi
+
+    log_message "Resizing $LV_PATH from ${CURRENT_SIZE_GB}G to ${NEW_SIZE_GB}G..."
+    if ! lvresize --resizefs --size "${NEW_SIZE_GB}G" "$LV_PATH"; then
+        log_message "Error resizing $LV_PATH. Attempting to start container ID $CONTAINER_ID..."
+        if ! pct start $CONTAINER_ID; then
+            log_message "Critical error: failed to start container ID $CONTAINER_ID after resize failure."
+        fi
+        return 1
+    fi
+
+    update_lxc_config "$LV_PATH" "$NEW_SIZE_GB"
+
+    log_message "Successfully resized $LV_PATH. Starting container ID $CONTAINER_ID..."
+    if ! pct start $CONTAINER_ID; then
+        log_message "Failed to start container ID $CONTAINER_ID after resizing."
+        return 1
+    fi
+
+    log_message "Container ID $CONTAINER_ID started successfully after resizing."
+}
+
+update_lxc_config() {
+    local LV_PATH="$1"
+    local NEW_SIZE_GB="$2"
+    local CONTAINER_ID=$(echo "$LV_PATH" | grep -oP 'vm-\K[0-9]+(?=-disk)')
+    local DISK_NAME=$(echo "$LV_PATH" | awk -F '/' '{print $NF}')
+    local CONFIG_PATH="/etc/pve/lxc/${CONTAINER_ID}.conf"
+
+    if [[ ! -f "$CONFIG_PATH" ]]; then
+        log_message "Configuration file for container ID $CONTAINER_ID does not exist."
+        return 1
+    fi
+
+    # Find the line with the disk and update its size
+    local PATTERN="(${DISK_NAME},size=)[^,]+"
+    sed -ri "s|$PATTERN|\1${NEW_SIZE_GB}G|" "$CONFIG_PATH"
+
+    if [[ $? -eq 0 ]]; then
+        log_message "Successfully updated the LXC configuration for container ID $CONTAINER_ID."
+    else
+        log_message "Failed to update the LXC configuration for container ID $CONTAINER_ID."
+        return 1
+    fi
+}
+
+# Main loop to check each LVM volume
+while IFS= read -r line; do
+    DISK_NAME=$(echo "$line" | awk '{print $1}')
+    POOL_NAME=$(echo "$line" | awk '{print $2}')
+    DATA_PERCENT=$(echo "$line" | awk '{print $6}' | sed 's/%//')
+
+    if [ "$(echo "$DATA_PERCENT > $THRESHOLD" | bc)" -ne 0 ]; then
+        log_message "Volume $DISK_NAME is over ${THRESHOLD}% full."
+        if ! resize_lv "/dev/$POOL_NAME/$DISK_NAME"; then
+            log_message "Failed to resize volume $DISK_NAME. Check logs for details."
+        fi
+    fi
+done < <(lvs --units g --separator ' ' --noheadings | grep -v swap)
+
+log_message "Check and resize operation completed."