Add Linux Kernel Management Tool

Linux Kernel Management Tool 1.0
Support RHEL/CentOS/Rocky/Alma/Oracle

CoreShell/Linux_Kernel_Management_Tool.sh

@@ -0,0 +1,250 @@
+#!/bin/bash
+
+# Check root Permissions
+clear
+if [ "$(id -u)" -ne 0 ]; then
+  echo "You must run this script as root."
+  exit 1
+fi
+
+# Program: Display Current Boot Linux Kernel version
+function display_current_kernel() {
+  echo ""
+  echo "Current Boot Linux Kernel:"
+  uname -r
+  sleep 3s
+}
+
+# Program: Display Next Boot Default Kernel version
+function display_default_kernel() {
+  default_kernel=$(grubby --default-kernel)
+  echo ""
+  echo "Next Boot Default Kernel:"
+  echo "$default_kernel"
+  sleep 3s
+}
+
+# Program: Identify Linux (RHEL) version
+CURRENT_LINUX_MAIN_VERSION=$(cat /etc/redhat-release|sed -r 's/.* ([0-9]+)\..*/\1/')
+echo "Current Linux Main Version is: " $CURRENT_LINUX_MAIN_VERSION
+ELREPO_KEY_URL="https://www.elrepo.org/RPM-GPG-KEY-elrepo.org"
+ELREPO_RPM_URL="https://www.elrepo.org/elrepo-release-$CURRENT_LINUX_MAIN_VERSION.el$CURRENT_LINUX_MAIN_VERSION.elrepo.noarch.rpm"
+RPM_PACKAGE="elrepo-release"
+
+# Program: Upgrade Kernel (LongTerm or MainLine Kernel Canbe Select)
+function upgrade_kernel() {
+
+# Program: Check ELRepo public key
+echo "Check and Import ELRepo public key...."
+curl -s -o /tmp/elrepo-public-key.temp $ELREPO_KEY_URL
+rpm --import /tmp/elrepo-public-key.temp 2>/dev/null
+if [ $? -eq 0 ]; then
+    echo "Finished"
+else
+    echo "Error"
+    rm -f /tmp/elrepo-public-key.temp
+    exit 1
+fi
+rm -f /tmp/elrepo-public-key.temp
+
+# Program: Install ELRepo
+if ! dnf list installed | grep -q $RPM_PACKAGE
+then
+    echo "Install ELRepo..."
+    dnf install -y $ELREPO_RPM_URL &>/dev/null
+    sed -i 's/mirrorlist=/#mirrorlist=/g' /etc/yum.repos.d/elrepo.repo
+    sed -i 's#elrepo.org/linux#mirrors.tuna.tsinghua.edu.cn/elrepo#g' /etc/yum.repos.d/elrepo.repo
+    dnf makecache &>/dev/null
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel repolist
+    echo "ELRepo Install Done."
+else
+    echo "ELRepo has been Installed."
+fi
+
+# Program: Check ELRepo Installation status
+if dnf list installed | grep -q $RPM_PACKAGE
+then
+    echo "ELRepo Successfully Installed and Available."
+else
+    echo "ELRepo Installation Failed or NotFound."
+    exit 1
+fi
+
+    # Display available Kernel packages
+    echo "available Kernel packages:"
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel list 'kernel*'
+    echo "Select Kernel version to Upgrade:"
+    echo "1. LongTerm（lt）"
+    echo "2. MainLine（ml）"
+    echo -n "Please Select (1-2): "
+    read -r kernel_type
+
+    case $kernel_type in
+    1)
+    # Upgrade to LongTerm（lt） Kernel
+    echo "Upgrade to LongTerm（lt） Kernel..."
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-lt.x86_64 &>/dev/null1
+    dnf remove kernel-tools-libs.x86_64 kernel-tools.x86_64 -y &>/dev/null
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-lt-tools.x86_64 &>/dev/null
+
+    if [ $? -eq 0 ]; then   
+        echo "LongTerm（lt） Kernel Upgrade Completed."
+      else
+        echo "Failed to Upgrade Linux Kernel."
+      fi
+      sleep 3s
+      ;;
+    2)
+    # Upgrade to MainLine（ml） Kernel
+    echo "Upgrade to MainLine（ml） Kernel..."
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml.x86_64 &>/dev/null
+    dnf remove kernel-tools-libs.x86_64 kernel-tools.x86_64 -y &>/dev/null
+    dnf --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml-tools.x86_64 &>/dev/null
+
+      if [ $? -eq 0 ]; then 
+        echo "MainLine（ml） Kernel Upgrade Completed."
+      else
+        echo "Failed to Upgrade Linux Kernel."
+      fi
+      sleep 3s
+      ;;
+    *)
+      echo "Invalid Input, Check keyboard input."
+      sleep 3s
+      ;;
+  esac
+}
+
+# Program: Set Next Boot Kernel
+function set_next_boot_kernel() {
+    echo "List the Installed Kernels and index Number."
+    grubby --info=ALL | grep -E '^(index=|kernel=)'
+    echo -n "Enter the Index Number of the Kernel for Next Boot: "
+    read -r modir_type
+    grubby --set-default $modir_type
+    echo "The Next Default Boot Kernel is set successfully."
+    grubby --default-kernel
+    # Ask the user for restart server
+    read -p "Do you want to restart the server? (y/n): " response
+
+    # Restart System Option
+    case "$response" in
+        [yY][eE][sS]|[yY])
+            echo "Server is Restarting......"
+            sleep 3s
+            reboot
+            ;;
+        *)
+            echo "User Ignores Restart Server."
+            sleep 3s
+            ;;
+    esac
+
+}
+
+# Program: Clean Kernel
+function clean_kernel() {
+
+# List All Installed Kernel packages.
+INSTALLED_KERNELS=$(rpm -qa | grep kernel | grep -v "^kernel-devel" | grep -v "^kernel-headers" | grep -v "^kernel-tools" | sort -V)
+
+# Get Currently Boot Kernel version.
+CURRENT_KERNEL=$(uname -r)
+
+# Displays All Installed Kernel versions.
+echo "Installed Kernel version: "
+echo "$INSTALLED_KERNELS"
+echo
+
+# Prompt User to Enter the Kernel Version to be Deleted (Multiple versions can be Entered, Separated by Spaces).
+read -p "Please enter the kernel version to be deleted (separated by spaces, or enter 'all' to delete all kernels except the current boot): " KERNELS_TO_REMOVE
+
+# If User inputs 'all', All Kernels will be Deleted except the Currently Boot Kernel.
+if [ "$KERNELS_TO_REMOVE" == "all" ]; then
+  KERNELS_TO_REMOVE=$(echo "$INSTALLED_KERNELS" | grep -v "$CURRENT_KERNEL")
+fi
+
+# Traverse the Kernel version Entered by user, check whether it contains the currently boot kernel.
+for KERNEL in $KERNELS_TO_REMOVE; do
+  if [ "$KERNEL" == "$CURRENT_KERNEL" ]; then
+    echo "Error: Cannot Delete Currently Boot Kernel. $CURRENT_KERNEL"
+    exit 1
+  fi
+done
+
+# Ask User If you are Sure you want to Delete these Kernels.
+read -p "Are you sure you want to delete the following kernel? $KERNELS_TO_REMOVE (y/n): " CONFIRM
+
+if [ "$CONFIRM" != "y" ] && [ "$CONFIRM" != "Y" ]; then
+  echo "Wrong Input, Operation Cancelled."
+  exit 0
+fi
+
+# Delete the User-Specified Kernel package.
+for KERNEL in $KERNELS_TO_REMOVE; do
+  echo "Deleting Kernel $KERNEL..."
+  rpm -e --nodeps "$KERNEL"
+  if [ $? -ne 0 ]; then
+    echo "Error: Unable Delete Kernel. $KERNEL"
+  else
+    echo "Kernel $KERNEL Successfully Deleted."
+  fi
+done
+
+echo "Operation Completed."
+sleep 3s
+}
+
+
+
+# Show Kernel Manger Menu
+function show_menu() {
+  clear
+  echo ""
+  echo "================================"
+  echo "Linux Kernel Management Tool"
+  echo "for RHEL/CentOS/Rocky/Alma/Oracle"
+  echo "via: cxthhhhh.com"
+  echo "================================"
+  echo "Please Select："
+  echo "1. Display Currently Boot Linux Kernel"
+  echo "2. Display Next Boot Default Kernel"
+  echo "3. Upgrade Kernel"
+  echo "4. Set Next Boot Kernel"
+  echo "5. Clean Kernel"
+  echo "0. Quit"
+  echo "================================"
+  echo ""
+}
+
+# Menu
+while true; do
+  show_menu
+  read -p "Please Select (0-5): " choice
+
+  case $choice in
+    1)
+      display_current_kernel
+      ;;
+    2)
+      display_default_kernel
+      ;;
+    3)
+      upgrade_kernel
+      ;;
+    4)
+      set_next_boot_kernel
+      ;;
+    5)
+    clean_kernel
+    ;;
+    0)
+      echo "Quit Tool..."
+      exit 0
+      ;;
+    *)
+      echo "Invalid Input, Check keyboard input."
+      sleep 3s
+      ;;
+  esac
+done