Rezwan It Solutions

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🚀 Project Completed | Issabel VoIP PBX Deployment & ConfigurationWe’re pleased to share the successful completion of an ...
29/08/2026

🚀 Project Completed | Issabel VoIP PBX Deployment & Configuration

We’re pleased to share the successful completion of an Issabel-based VoIP PBX deployment and configuration project by Rezwan IT Solutions.

🔹 Key implementations:
✅ Issabel & Asterisk PBX deployment
✅ SIP Extension configuration
✅ SIP Trunk & Call Routing
✅ IVR configuration
✅ Call Queue setup
✅ CDR & Call Management
✅ Linux Server Administration
✅ SIP/VoIP troubleshooting
✅ System stability & basic security hardening

The solution was configured to provide a reliable, scalable, and centralized business communication environment with improved call management and operational flexibility.

At Rezwan IT Solutions, we provide practical IT solutions for businesses, including:

💻 Linux & Server Administration
☁️ AWS & Cloud Infrastructure
🌐 Network Infrastructure & MikroTik
📞 VoIP, Asterisk, Issabel & 3CX
🔐 IT Infrastructure & Security
⚙️ Office Managed IT Support

Need help with your VoIP, PBX, Linux server, networking, or cloud infrastructure?

📩 Feel free to connect with us for professional IT solutions.

☁️ Most Popular Cloud Platforms — Cloud Computing-এর কথা বললে শুধু AWS জানলেই সব শেষ নয়। বর্তমানে বিভিন্ন organization ...
25/08/2026

☁️ Most Popular Cloud Platforms —
Cloud Computing-এর কথা বললে শুধু AWS জানলেই সব শেষ নয়। বর্তমানে বিভিন্ন organization তাদের business requirements অনুযায়ী different Cloud Platforms ব্যবহার করে

🌍 Most Popular Cloud Platforms:

🥇 1. AWS — Amazon Web Services

📌 Where is it commonly used?
• Startups থেকে large enterprises
• Web & application hosting
• DevOps & Cloud Infrastructure
• E-commerce and scalable applications

🔹 Key Services: EC2, S3, VPC, IAM, RDS, Lambda, CloudWatch

🥈 2. Microsoft Azure

📌 Where is it commonly used?
• Enterprise & corporate environments
• Windows Server infrastructure
• Microsoft 365 & Entra ID ecosystem
• .NET applications & hybrid infrastructure

🔹 Key Services: Azure VM, VNet, Blob Storage, Entra ID, AKS

🥉 3. Google Cloud — GCP

📌 Where is it commonly used?
• Kubernetes & cloud-native applications
• Data Analytics
• AI/ML workloads
• High-scale applications

🔹 Key Services: Compute Engine, Cloud Storage, VPC, GKE, BigQuery

🔵 4. Oracle Cloud Infrastructure — OCI

📌 Where is it commonly used?
• Oracle Database workloads
• Oracle ERP & enterprise applications
• Large enterprise environments

🟠 5. Alibaba Cloud

📌 Where is it commonly used?
• China & Asia-focused businesses
• E-commerce
• Alibaba ecosystem
• Large-scale cloud infrastructure

🟣 6. IBM Cloud

📌 Where is it commonly used?
• Large enterprises
• Hybrid Cloud
• Banking & regulated industries
• IBM enterprise solutions

🧭 Which Cloud Should You Learn First?
A practical learning path can be:

Step 01 — Cloud Fundamentals
Understand:

➡️ IaaS / PaaS / SaaS
➡️ Public / Private / Hybrid Cloud
➡️ Virtualization
➡️ Compute
➡️ Storage
➡️ Networking
➡️ IAM
➡️ Security
➡️ High Availability & Scalability

Step 02 — Choose One Major Cloud
Start with AWS and learn it practically:

EC2 → VPC → IAM → S3 → RDS → Load Balancer → Auto Scaling → CloudWatch

Step 03 — Linux & Networking
Learn Linux administration and core networking alongside Cloud.

Step 04 — Learn a Second Cloud

After becoming comfortable with AWS, move to Azure or GCP.

At this stage, you'll notice that many concepts are similar:

AWS VPC ≈ Azure VNet ≈ GCP VPC

AWS EC2 ≈ Azure VM ≈ GCP Compute Engine

So you don't need to memorize everything from zero.

একটি Organization-এর জন্য কোন কোন Server প্রয়োজন? 🖥️একটি organization-এর IT infrastructure design করার সময় সবচেয়ে com...
22/08/2026

একটি Organization-এর জন্য কোন কোন Server প্রয়োজন? 🖥️

একটি organization-এর IT infrastructure design করার সময় সবচেয়ে common প্রশ্নগুলোর একটি হলো:

আমাদের জন্য কোন কোন server দরকার?

এর উত্তর নির্ভর করে organization-এর size, users, applications, security requirements এবং business workload-এর উপর।

সব organization-এর জন্য সব ধরনের server প্রয়োজন হয় না। তবে একটি typical corporate environment-এ নিচের serverগুলো গুরুত্বপূর্ণ হতে পারে:

🔹 1. Domain Controller / Active Directory Server:
User account, authentication, Group Policy এবং centralized access management-এর জন্য।

🔹 2. DNS Server:
Internal hostname resolution এবং network services properly কাজ করার জন্য।

🔹 3. DHCP Server:
Client devices-কে automatically IP address, gateway এবং DNS configuration দেওয়ার জন্য।

🔹 4. File Server:
Centralized file storage, sharing এবং permission management-এর জন্য।

🔹 5. Application Server:
Organization-এর ERP, HR, CRM বা অন্যান্য business applications host করার জন্য।

🔹 6. Database Server:
Application-এর data securely store, manage এবং query করার জন্য।

🔹 7. Web Server:
Internal বা public-facing website/web application host করার জন্য।

🔹 8. Email Server / Email Service:
Corporate email communication-এর জন্য। অনেক organization নিজস্ব mail server-এর পরিবর্তে Microsoft 365 বা Google Workspace ব্যবহার করে।

🔹 9. Backup Server:
Critical data, VM এবং application backup রাখার জন্য।

Backup ছাড়া production environment কখনোই truly safe নয়।

🔹 10. Monitoring Server: 📊
Server, network, service, CPU, RAM, disk এবং availability monitor করার জন্য।

যেমন: Zabbix, PRTG বা অন্যান্য monitoring solutions।

🔹 11. VPN Server: 🔐
Remote employees বা branch office থেকে secure access দেওয়ার জন্য।

🔹 12. VoIP / PBX Server: ☎️
যেসব organization IP telephony বা call center ব্যবহার করে, তাদের জন্য SIP/PBX server প্রয়োজন হতে পারে।

তাহলে কি সবগুলো আলাদা physical server হতে হবে?

না।

Small organization-এ virtualization ব্যবহার করে একটি physical server-এর উপর multiple VM চালানো যেতে পারে।

Example:
Physical Server → Proxmox/VMware/Hyper-V → AD + DNS + File Server + Monitoring + Application VM

তবে critical workload হলে redundancy, resource allocation, backup এবং high availability carefully design করতে হবে।

একজন Infrastructure Engineer-এর কাজ শুধু Server Install করা নয়।সঠিক প্রশ্ন হলো:

Business requirement কী?
↓
কোন service প্রয়োজন?
↓
Physical / Virtual / Cloud — কোন architecture উপযুক্ত?
↓
Security কীভাবে নিশ্চিত করব?
↓
Backup & Disaster Recovery কীভাবে করব?
↓
Monitoring & Alerting কীভাবে করব?

একটি ভালো infrastructure হলো এমন infrastructure যা শুধু আজ কাজ করে না—আগামী দিনের growth এবং failure scenario-ও handle করতে পারে।

🖥️ Server Slow? Don’t Restart First!একজন System/Infrastructure Engineer-এর জন্য “Server slow” একটা খুব common complaint....
20/08/2026

🖥️ Server Slow? Don’t Restart First!
একজন System/Infrastructure Engineer-এর জন্য “Server slow” একটা খুব common complaint.

কিন্তু সরাসরি server restart করার আগে কিছু basic troubleshooting করা উচিত।

আমি সাধারণত এই বিষয়গুলো check করি:

🔹 1. CPU Utilization:
CPU কি continuously 90–100% এ আছে?

🔹 2. RAM Usage:
Memory exhaustion বা excessive swapping হচ্ছে কি?

🔹 3. Disk Usage:
Disk space কি প্রায় full?
বিশেষ করে /var, /, বা application log directory

🔹 4. Disk I/O:
CPU/RAM normal হলেও Disk I/O high হলে application slow হতে পারে।

🔹 5. Network:
Packet loss, latency বা unusual traffic আছে কি?

🔹 6. Running Processes:
কোন process অস্বাভাবিকভাবে বেশি CPU/Memory consume করছে?

🔹 7. Logs:
System/application logs-এ কোনো error বা warning পাওয়া যাচ্ছে কি?

🔹 8. Services:
কোনো critical service failed, stuck বা repeatedly restarting করছে কি?

Linux server হলে basic checks হিসেবে:
top / htop
free -h
df -h
iostat
uptime
journalctl

⚠️ Important:

“Server slow” মানেই CPU problem নয়।

অনেক সময় Root Cause হতে পারে:

High Disk I/O → Memory Pressure → Network Issue → Application Issue → Database Issue → Log/Storage Problem

তাই troubleshooting-এর সময় symptom নয়, root cause identify করাই সবচেয়ে গুরুত্বপূর্ণ।

💡 Restart can hide the problem.

Troubleshooting helps you find the problem.

🖥️ আপনার Business-এর জন্য সবসময় Full-Time IT Engineer দরকার হয় না — দরকার একটি Reliable IT Systemঅনেক Small & Growing ...
13/08/2026

🖥️ আপনার Business-এর জন্য সবসময় Full-Time IT Engineer দরকার হয় না — দরকার একটি Reliable IT Systemঅনেক Small & Growing Business-এর জন্য full-time IT engineer রাখা সবসময় practical বা necessary নয়।

আপনার business-এর আসল প্রয়োজন হলো—

Reliable IT Infrastructure + Continuous Monitoring + Quick Support + Security + Preventive Maintenance.

এই concept থেকেই আসে IT Department as a Service. 🚀

একটি complete in-house IT team তৈরি না করেও আপনার business-এর IT infrastructure professionally manage করা সম্ভব।

আমরা যেসব IT Infrastructure manage করতে পারি:

🔹 Network & Internet Infrastructure
🔹 Server & Virtualization
🔹 24/7 Infrastructure Monitoring
🔹 Backup & Disaster Recovery
🔹 Firewall & Network Security
🔹 VoIP / IP-PBX & Call Center
🔹 CCTV & NVR Infrastructure
🔹 User & Device Support
🔹 Preventive Maintenance
🔹 IT Documentation & Asset Management

আমাদের লক্ষ্য শুধু problem হওয়ার পরে fix করা নয়।
বরং:

Monitor → Prevent → Secure → Optimize → Support

অর্থাৎ, সমস্যা হওয়ার পর অপেক্ষা না করে আগেই problem detect এবং prevent করা।

আপনার team যেন IT troubleshooting নিয়ে ব্যস্ত না থেকে business growth-এর দিকে focus করতে করতে পারে।

"You focus on your business.
We take care of your IT infrastructure."

Traditional IT Support:

❌ “Problem হলে আমাদের call করবেন.”

Modern IT Management:

✅ “We monitor your infrastructure before it becomes a problem.”

বিশেষ করে Bangladesh-এর SME ও growing businesses-এর জন্য outsourced IT management হতে পারে একটি practical এবং scalable solution.

আপনার business-এর IT infrastructure যদি secure, monitored এবং properly managed থাকে, তাহলে technology আপনার business-এর বাধা নয়—growth-এর foundation হয়ে দাঁড়ায়। 🚀

☁️ Virtualization vs Cloud: Which Infrastructure Fits Your Business?ESXi, Proxmox নাকি AWS?আলাদা ধরনের business requirem...
11/08/2026

☁️ Virtualization vs Cloud: Which Infrastructure Fits Your Business?

ESXi, Proxmox নাকি AWS?

আলাদা ধরনের business requirement পূরণ করে।

🔹 ESXi / Proxmox → On-Premise Virtualization
নিজের physical server, storage এবং network নিজেকেই manage করতে হবে।

🔹 AWS Cloud → Cloud Infrastructure
Physical hardware না কিনেই compute, storage, networking এবং বিভিন্ন managed service ব্যবহার করা যায়।

কোন Client-এর জন্য কোনটা ভালো?

🏢 নিজস্ব hardware + On-Premise requirement → ESXi / Proxmox

🚀 Startup + দ্রুত scalable application → AWS

🔐 Physical infrastructure-এর উপর বেশি control প্রয়োজন → On-Premise Virtualization

📈 দ্রুত scaling + Pay-as-you-go model → Cloud

মূল কথা:
Virtualization হলো একটি technology।
Cloud হলো infrastructure delivery model।

সঠিক solution নির্ভর করবে budget, scalability, control, security এবং business requirement-এর উপর।

🌐 Happy World Wide Web (WWW) Day!Today, we celebrate the invention that transformed the way we connect, communicate, lea...
01/08/2026

🌐 Happy World Wide Web (WWW) Day!

Today, we celebrate the invention that transformed the way we connect, communicate, learn, and do business—the World Wide Web.

From accessing information in seconds to enabling cloud computing, e-commerce, remote work, and digital transformation, the Web has become the foundation of modern technology.

As an IT professional, I'm grateful to be part of an industry that continues to build, secure, and optimize the technologies that keep the Web running for millions of users every day.

Let's continue to innovate, share knowledge, and create a safer, faster, and more connected digital world.

💻 Happy World Wide Web Day to all developers, system administrators, network engineers, cybersecurity professionals, and tech enthusiasts!

Happy System Administrator Day! 🎉💻Here's to the professionals who keep servers running, networks secure, and businesses ...
31/07/2026

Happy System Administrator Day! 🎉💻
Here's to the professionals who keep servers running, networks secure, and businesses connected. Thank you to every SysAdmin for your dedication, expertise, and countless hours behind the scenes.

Proud to be part of this amazing community.

Happy SysAdmin Day! 🚀

🔧 Simplify Your IT Operations with Rezwan IT SolutionsTechnology should empower your business—not slow it down.At Rezwan...
29/07/2026

🔧 Simplify Your IT Operations with Rezwan IT Solutions

Technology should empower your business—not slow it down.

At Rezwan IT Solutions, we help businesses build secure, reliable, and scalable IT infrastructure that supports growth and improves operational efficiency.

How We Help Businesses:
✅ IT Infrastructure Design & Management
✅ Linux & Windows Server Administration
✅ VoIP & IP PBX Solutions
✅ Cloud Infrastructure Support (AWS)
✅ System Monitoring & Performance Optimization
✅ Backup & Disaster Recovery
✅ Network Security & Firewall Configuration
✅ Remote IT Support & Troubleshooting

Whether you're a startup, SME, or enterprise, we deliver practical, cost-effective IT solutions tailored to your business needs.

📩 Looking for a reliable technology partner? Let's connect and discuss how we can support your business.

🐧 Build a Secure & Reliable Linux Infrastructure for Your BusinessA powerful business starts with a stable server.At Rez...
23/07/2026

🐧 Build a Secure & Reliable Linux Infrastructure for Your Business

A powerful business starts with a stable server.

At Rezwan IT Solutions, we provide professional Linux Server Deployment & Management services to ensure your infrastructure is secure, scalable, and always available.

Our Linux Solutions:

✅ Ubuntu, Rocky Linux, AlmaLinux & Debian Server Deployment
✅ Web Server (Apache & Nginx) Setup
✅ Database Server Configuration (MySQL & MariaDB)
✅ Docker & Container Deployment
✅ Zabbix & Grafana Monitoring Server Setup
✅ VPN, DNS & File Server Configuration
✅ Server Security Hardening & Firewall Setup
✅ Cloud Server Deployment (AWS & VPS)
✅ Backup, Performance Optimization & Troubleshooting

🎯 Whether you're a startup, corporate office, software company, ISP, or call center, we deliver Linux solutions tailored to your business needs.

💼 Reliable. Secure. Scalable.

📩 Inbox Rezwan IT Solutions today for a free consultation and take your IT infrastructure to the next level.

Rezwan IT Solutions
-Solutions for Success

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Uttara
Dhaka

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