1. OS-Level Hardening 🔹 Minimal Installation – Install only necessary packages. Avoid GUI on servers unless required.🔹 Update Regularly – Apply security patches promptly using apt update && apt upgrade (Debian) or yum update (RHEL).🔹 Disable Unused Services – Use systemctl disable –now <service> for unnecessary daemons.🔹 Enable SELinux or…
Tag: #CentOS
Configure Outlook with Gmail
tep 1: Enable IMAP in Gmail Step 2: Generate an App Password (For 2FA Accounts) If your Gmail account has 2-Step Verification enabled, you must generate an App Password: Step 3: Configure Outlook Step 4: Test and Verify
ESXi 7.0 → 8.0Upgrading from VMware ESXi 6.0 to 8.0ESXi 7.0 → 8.0
Upgrading from VMware ESXi 6.0 to 8.0 is a multi-step process, as ESXi 6.0 is not directly upgradable to ESXi 8.0. You must first upgrade to ESXi 6.7 or 7.0, and then proceed to 8.0. Step 1: Pre-Upgrade Checks ✅ Verify Hardware Compatibility ✅ Check Existing vCenter Version ✅ Backup…
Difference between upgrade and update
The difference between upgrade and update depends on the context, but in general: 1. Software & OS 2. Hardware 3. Cloud & Virtualization 4. Networking & Storage
Types of Backups
1. Full Backup A complete copy of all selected data is taken.✅ Pros: Simplifies recovery, standalone backup.❌ Cons: Time-consuming, high storage usage. 2. Incremental Backup Only data that has changed since the last backup (of any type) is copied.✅ Pros: Saves time and storage.❌ Cons: Recovery can be slow, as…
Updating ManageEngine ServiceDesk Plus (HA)
Step 1: Pre-Update Preparations Step 2: Updating the Secondary Node Step 3: Updating the Primary Node Step 4: Restore Failover & Sync Final Checks ✅ Login works on both nodes✅ No database errors in logs✅ Load balancer distributes traffic correctly✅ Failover test succeeds
Automated Scripts for Web Server Hardening (Nginx, Apache, Caddy, IIS) 🚀
🛡️ Nginx Hardening Script (Bash) bash#!/bin/bash# Update system & install required packagesapt update && apt upgrade -yapt install -y nginx ufw fail2ban# Disable server tokens (hide Nginx version)echo “server_tokens off;” >> /etc/nginx/nginx.conf# Enable rate limiting & security settingscat <<EOF > /etc/nginx/conf.d/security.confclient_max_body_size 10M;client_body_timeout 10s;client_header_timeout 10s;keepalive_timeout 15s;limit_conn_zone \$binary_remote_addr zone=conn_limit:10m;limit_req_zone \$binary_remote_addr zone=req_limit:10m rate=5r/s;EOF#…