Linux Optimizer

This Bash script automates the optimization of your Linux server.

It performs the following tasks:

0. Fix hosts file and DNS (temporarily):

   • Check and add 127.0.1.1 and server hostname to /etc/hosts.

   Original hosts file is backed up at /etc/hosts.bak.

   • Add 1.1.1.2, 1.0.0.2 nameservers to /etc/resolv.conf.

   Original dns file is backed up at /etc/resolv.conf.bak.

1. Update, Upgrade, and Clean the server:

   • Update
   • Upgrade
   • Full-Upgrade
   • AutoRemove
   • AutoClean
   • Clean

2. Disable Terminal Ads (Only on Ubuntu).

3. Install XanMod Kernel (Only on Ubuntu & Debian):

   • Enable BBRv3.
   • CloudFlare TCP Optimizations.
   • More Details: https://xanmod.org
   • CAUTION: Some VMs do not support kernel changes. Installing Xanmod could cause the VM to break. Please be cautious and test beforehand.

4. Install Useful Packages:

   apt-transport-https apt-utils autoconf automake bash-completion bc binutils binutils-common binutils-x86-64-linux-gnu build-essential busybox ca-certificates cron curl dialog epel-release gnupg2 git haveged htop jq keyring libssl-dev libsqlite3-dev libtool locales lsb-release make nano net-tools packagekit preload python3 python3-pip qrencode socat screen software-properties-common ufw unzip vim wget zip

5. Enable Packages at Server Boot.

6. Set the server TimeZone to the VPS IP address location.

7. Create & Enable SWAP File:

   • Swap Path: "/swapfile"
   • Swap Size: 2Gb

8. Enable IPv6 Support.

9. Optimize the SYSCTL Configs:

   • Optimize File System Settings.
   • Optimize Network Core Settings.
   • Optimize SWAP.
   • Optimize TCP and UDP Settings.
   • Optimize UNIX Domain Sockets Settings.
   • Optimize Virtual memory (VM) Settings.
   • Optimize Network Configuration Settings.
   • Optimize the Kernel.
   • Activate BBR (BBRv3 with XanMod).

   Original file is backed up at /etc/sysctl.conf.bak.

10. Optimize SSH:

    • Disable DNS lookups for connecting clients.
    • Remove less efficient encryption ciphers.
    • Enable and Configure TCP keep-alive messages.
    • Allow agent & TCP forwarding.
    • Enable gateway ports, Tunneling and compression.
    • Enable X11 Forwarding.

    Original file is backed up at /etc/ssh/sshd_config.bak.

11. Optimize the System Limits:

    • Soft and Hard ulimit -c -d -f -i -l -n -q -s -u -v -x optimizations.

12. Optimize UFW and open Common Ports:

    • Open Ports SSH, 80, 443.
    • With IPv6, TCP & UDP.

Reboot at the end is Recommended.

Prerequisites

Ensure that the sudo and wget packages are installed on your system:

• Ubuntu & Debian:

sudo apt update -q && sudo apt install -y sudo wget

• CentOS & Fedora:

sudo dnf up -y && sudo dnf install -y sudo wget

Run

Tested on: Ubuntu 20+, Debian 11+, CentOS Stream 8+, AlmaLinux 8+, Fedora 37+

Root Access is Required. If the user is not root, first run:

sudo -i

Then:

wget "https://raw.githubusercontent.com/hawshemi/Linux-Optimizer/main/linux-optimizer.sh" -O linux-optimizer.sh && chmod +x linux-optimizer.sh && bash linux-optimizer.sh 

Menu Image

Debian & Ubuntu:

CentOS, AlmaLinux & Fedora:

Disclaimer

This script is provided as-is, without any warranty or guarantee. Use it at your own risk.

License

This script is licensed under the MIT License.