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With more than a decade of hands-on experience in Linux server administration, I bring deep expertise in managing, optimizing, and troubleshooting complex Linux infrastructures. I have provided enterprise-grade web hosting and server support for major platforms including Hostinger, GoDaddy, Bluehost, OVH, DigitalOcean, Hetzner, and IONOS, supporting large-scale shared, VPS, and dedicated environments. My skill set includes comprehensive WordPress management and migrations, covering site deployments, performance optimization, security remediation, malware cleanup, and zero-downtime migrations. I also specialize in architecting and maintaining robust web stacks using Apache, Nginx, BIND DNS, PHP (5.x–8.x), and MySQL/MariaDB, with a strong focus on reliability, performance, and security. I have a proven track record of handling critical tasks such as server security hardening, kernel upgrades, and server performance optimization. Additionally, I am proficient in administering and monitoring Linux servers remotely using advanced tools and technologies. Key Specialties: Linux System Administration (CentOS, AlmaLinux, RHEL, Debian, Ubuntu, CloudLinux) Large-scale server migrations, including WordPress and Joomla migrations Server upgrades, including CentOS 7 to AlmaLinux 8/9/10 transitions Expertise in web hosting panels (cPanel, Plesk, DirectAdmin, Virtualmin) and cloud solutions (AWS EC2, Lightsail, DigitalOcean, Linode, Vultr, Google Cloud) Expertise in DNS integration for Shopify, Wix, Cloudflare, Google WorkSpace, Microsoft 365 DNS administration, including advanced configurations for SPF, DMARC, and DKIM PCI compliance management, server disaster recovery, and data restoration Website security, including hack cleanups and proactive hardening Tools and Technologies: LAMP stacks, DNS, and mail servers (Exim/Postfix) Backup solutions (R1Soft, rsync-based scripting) Server monitoring (Nagios) and optimization tools Security-focused tools like CSF and LFD If you're looking for a dedicated and detail-oriented Linux server administrator who can ensure your systems run smoothly and securely, let's collaborate to meet your technical goals.

Need help with cPanel, Plesk, WordPress, server migration, malware cleanup or email issues? I have 9+ years of experience managing production Linux servers and resolving critical hosting problems quickly with minimal downtime. My role is to: * Linux - Troubleshooting various issues by checking logs - OS : CentOS, Debian, Ubuntu. * Hosting server - Harden dedicated server, node, vps for its best performance. * CMS - WordPress, Joomla, Drupal, Magento. * Virtualization - OpenVZ/Virtuozzo, VMware, Xen, KVM * Networking - To configure network, add/remove IP address * DNS - Bind/named, configure custom and registrar nameservers * VPN - OpenVPN, configuration of squid proxy servers * Firewalls - Iptables, CSF, APF * Web servers - Apache, Nginx (standalone), Nginx Admin, Lighttpd, Tomcat * E-mail servers - Exim, Postfix, Qmail, Courier- dovecot * Anti-spam/antivirus - ClamAV, Maldet, SpamAssassin * Bulk email marketing - DKIM & SPF, tweaking SpamAssassin * Automation - Experienced in bash/shell scripting * Monitoring Tools - Nagios, Zabbix, Pingdom My other skills are given below ================== Amazon Web Services (AWS) ================== - AWS EC2 Server setup - Management and troubleshooting - S3 Buckets - AWS Lightshail Server - AWS SES Email Setup (Configuration in Sendy) ================== Webhosting Control Panel ================== - cPanel/WHM, Plesk, Centos Webpanel, VestaCP, ZPanel, Kloxo, Webmin/Virtualmin, CyberPanel - Any free or paid control panel installation + Setup - cPanel installation and configuration - Server Hardening the security - Manage Linux server on monthly bases - Server Migration ================== WordPress ================== - WordPress Server Setup - WordPress Migration - WordPress Malware Removal - WordPress Virus Removal - WordPress Security - Import demo contents - WordPress Backup/Restore - WordPress and WHMCS integration ================== Linux Server Management ================== - Setup and manage AWS or Google Cloud Server/Google Cloud Platform - AWS, GCP, Digitalocean, Linode, Vultr, OVH, Contabo, 1and1, VPSDime, etc... - Godaddy, Hostgator, BlueHost, Siteground, Namecheap, etc.. - Linux ( RHEL, CentOS, Ubuntu,Debian ) - Database Administration (MySQL,PostgreSQL, MariaDB, MongoDB) - DNS Server (Bind, NSD, PowerDNS ) - Web Server (LAMP, LEMP) ==================

Enterprise level Linux system engineer and Cloud architect with 8+ years of experience in:- -- LAMP/LEMP(Nginx) administration and server security hardening (Ubuntu, Debian, Centos,RHEL,HAProxy, Ruby deployment, DevOps, Python/Django deployment DevOps,Nagios, fail2ban, CloudFlare..) -- Amazon web services - AWS (EC2, VPC, RDS, S3, Route53, Cloudfront, Elastic Load Balancer, AutoScaleing, etc..) -- DDoS mitigation and prevention -- Nginx rewrites -- Google pagespeed -- Linux troubleshooting -- VPS providers: Linode, Rackspace, Amazon(AWS), MediaTemple, HostGator, Cloudflare, MaxCDN, CloudFront, NameCheap, GoDaddy, DigitalOcean, EC2, Bluehost -- Parallels Plesk -- Odoo/OpenERP installation -- VPS administration -- AWS EC2 administration -- VMware vSphere --NewRelic -- fail2ban -- openswan -- HAProxy -- keepalived, vrrp -- elasticsearch -- Nagios monitoring -- Elastic Load Balancer -- LINUX deployment and migration -- Rackspace Cloud Services -- Ruby on Rails app deployment -- Python - Djengo app deployment -- CPANEL, PLESK, WEBMIN, SHELL/SSH administration -- proftpd, pure-ftpd, pure ftp -- DNS, BIND, PowerDNS -- SSL certificates -- Site migration -- Network troubleshooting -- CSF firewall -- VPN -- Cisco, Mikrotik, Juniper Networks, Extreme Networks.. -- Linux PENTAHO deployment -- Squid, AiCache, AiScaler. Experience with various providers such as:- -AMAZON WEB SERVICES (AWS, EC2..) -RACKSPACE -HOSTGATOR -GoDaddy -MediaTemple -Cloudflare -NameCheap -LINODE -QuickWeb -HAProxy -heroku -etc.. -WHMCS RESELLER setup and migration on project or permanent basis. Including DNS, EMAIL, WORDPRESS migration -CPANEL, PLESK, WEBMIN, H-sphere, SHELL administration -SSL certificates

I'm a linux sysadmin and have worked in a web hosting company for more than eight years and now doing a full-time sysadmin consulting.  I handle servers from co-locations/data centers to different vps and cloud hosting providers such as Rackspace, Amazon, Linode, DigitalOcean, and Softlayer.  I managed mostly lamp-stack servers on CentOS/RHEL and Debian/Ubuntu and several cPanel/WHM servers for shared hosting clients.  I have designed and deployed mid to large scale highly scalable, fault tolerant, automated and secure IT infrastructures using cutting edge complex technologies such as cloud computing, aws/ec2, NoSQL databases, hadoop, load balancers, chef/puppet configuration management systems, varnish cache, nginx/apache web servers, solr search and indexing, virtualization, LAMP and python frameworks, RoR etc.   Operating Systems: - Servers: RHEL, CentOS, Debian, Ubuntu, openSUSE, solaris Cloud and Hosting Providers: - Manage instances deployed in Rackspace, Amazon, and Linode - Manage dedicated servers in datacenter co-locations and Softlayer Virtualization and Cloud technologies: - Xen: setup, configure, and manage virtual machines running Debian and CentOS -openvz : setup, configure, manage and migrate virtual machines running on CentOS - OpenStack and Eucalyptus: setup, configure, and manage private cloud deployments Hosting Control Panels: - Manage multiple cPanel servers for shared hosting clients and services - Previous experiences include Plesk, zpanel, directadmin, and Webmin control panels DNS: -- Manage DNS cluster on Cpanel DNSOnly versions. Manage zones hosted and integrated with Cpanel servers. - Manage Bind DNS service on dedicated and Cpanel servers (WHM and DNSOnly versions). Manage zones hosted at Softlayer and integrated with Cpanel servers - Managed DNS from different hosting providers (Godaddy, NetworkSolutions, SRSPlus) as well as migrating entire DNS/NameServers between different providers.  Backups: - Cpanel Backups, and different rsync scripts (rsnapshot, rsback, rdiff), remote ftp backup. - Administer backups from cloud providers such as AmazonS3 and Rackspace CloudBackup Version Control Systems: - Git: setup and manage dedicated git hosting server running Gitolite and Gitlab - Github: manage organizations and private repositories. Setup deploy keys and webhooks Alerts and Monitoring: - Configure Nagios/opesview and cacti for servers and services monitoring - Server graphing with NewRelic and Pingdom services. Previous work experience includes Cacti, Graphite, MRTG, and PRTG. Drupal CMS Administration: - Managed Drupal 5,6, and 7 sites on LAMP-stack from different hosting providers - Drupal server and site performance evaluation, tuning, and optimizations - Setup and configure Drupal integration with CiviCRM, ApacheSolr/Tomcat, Memcached, APC, and Varnish - Applies Drupal standard and security updates on different site environments Server Security: - Experienced with setting up PCI Compliant servers. Scanning tools include dedicated Nessus server and third-party scanner like Trustwave and ControlScan - Setup and manage firewall rules with iptables, ufw, configserver firewall (csf), Rackspace RackConnect, AWS SecurityGroups, dedicated firewall devices.  - Rkhunter, Chkrootkits, SSHD, TCP Wrapper, fail2ban.

✅ ABOUT ME: I am a Professional Full Time Freelancer. I have 9+ years of experience working on Windows/Linux server administration, CICD Devops ,AWS, Azure, windows/Linux troubleshooting, HyperV, proxmox servers, DNS records mapping, IIS, Domains and DNS records management, active directory, web server, webhosting, databases administrations and Mail server implementations, administrations for the mail services MS Office365, Gsuite, Zimbara and postfix . ✅ WHY ME? • Full-time Professional – I work on Upwork as a full-time freelancer. I take every project seriously and I am highly professional. • Highly responsive – I’ll always get back to you in less than 02 hours. • 100% Client satisfaction – I provide revisions and modifications even after our contract ends. • I provide accurate solutions and just as important, I can guide you to future prospects and put your project on the right track. • Good communication skills – You will find me very friendly to talk to. ========================================= #Windows Servers - clients #Linux Server - clients #Web servers - IIS, Apache, XAMPP, Nginx and Tomcat #Database Servers - MSSQL, ORACLE, MYSQL, MongoDB #Webhosting tools- Plesk, cPanel and CWP #Cloud services providers - AWS, Azure, GCP, Digital Ocean, World stream, OVH Cloud, Hetzner and Hosting raja #Hosting providers - Hostinger, Bluehost, Namecheap, Godaddy, Bigrock and Hostgator #Active Directory - setup, users creation, Centralized Management, policy creation and enhanced Security #Troubleshooting - L1, L2 Tools used ============== Github, SVN IIS,Apache,Tomcat,Nginx , Apache Kafka and Wordpress SSH, RDP, VNC, Anydesk, Splashtop and screen connect Mobaxterm,Toad,SSMS and Workbench Plesk,WHM,Cpanel Active Directory, IAM Servicenow, Redmine, Microsoft Teams and Slack Previous Clients Feedback: 1- "Karthik was an exceptional Upworker to deal with. He was responsive, communicative, knowledgeable and proactive at solving my urgent technical issue (my businesses website was down for an unknown reason) and I wouldn't hesitate to recommend him to anyone else seeking an excellent technical support specialist. Thank you Karthik!" 2- "Karthik went above and beyond to progress with a very difficult issue in a very short period of time. He is kind, hard-working, and knowledgeable." 3- "I recently had the pleasure of working with "Karthik Raja" on installing PMB Software project, and I must say it was an outstanding experience from start to finish. I highly recommend "Karthik Raja" to anyone seeking top-notch freelancing services." 4- "he provides ideas to solve our problems he is a best gem have ever met. He focused only in customer satisfaction. no negative reviews." So why wait? Just invite me to your job on Upwork so we can discuss how to make your project a success. Let’s work together and get it done!! Thanks, Karthik

About Me I am an experienced professional with over 4 years of expertise in web hosting, email marketing, cloud computing, and DevOps. I am proficient in managing diverse cloud platforms like AWS, Azure, and GCP. Additionally, I have in-depth knowledge of containerization and automation tools, including Docker, Ansible, Terraform, and Jenkins. I specialize in web hosting for platforms like WordPress, Core PHP, Laravel, Magento, Node.js, and React.js, along with comprehensive expertise in server management and email marketing solutions. I have a proven track record in managing diverse hosting environments, configuring email marketing tools, and optimizing cloud infrastructure. Additionally, I lead a dedicated team that excels in delivering web development and SEO/digital marketing solutions tailored to client needs. Core Expertise Web Hosting and Server Management: Proficient in managing all server types: Dedicated, VPS, Shared, Cloud Servers. Skilled in control panel management: WHM/cPanel, Plesk, CWP, Virtualmin, Hestia, etc. Server Setup, Monitoring, and Backup Management. Website Migration and SSL Installation. Email Marketing: Extensive experience with SMTP servers: Postfix, PowerMTA, Exim, G Suite, Office 365, and third-party providers like SendGrid, SendinBlue, Elastic Email, AWS SES, Zimbra, etc. Expertise in email campaign management tools: Mailwizz, Interspire, Mautic, Acelle, Mumara, etc. Cloud and DevOps: Skilled in deploying and managing cloud solutions on AWS, Azure, and GCP. Proficiency in Docker, Ansible, Terraform, and Jenkins for automation and orchestration. Services Offered: Server-Related Tasks: Web Hosting Email Marketing Cloud Services DevOps Linux/Windows Server Management Web Development Services: WordPress Laravel PHP Node.js Magento SEO and Digital Marketing Services: Search Engine Optimization (SEO) Social Media Optimization (SMO) Content Creation and Marketing Blogging and Revenue Optimization Private Blog Network (PBN) Building and Link Networks Search Engine Algorithm Analysis Lead Generation and Sales Funnels Email Marketing, Outreach, and Networking CMS-Based Web Design PPC, CPM, CPL, CPI, CPA Advertising Tools Online Display Advertising Online Reputation Management (ORM) Affiliate Marketing Web Data Analytics Video and YouTube Marketing Why Choose Us? I lead a team of skilled professionals capable of delivering end-to-end solutions for web development, server management, email marketing, and digital marketing. Together, we ensure high-quality services that cater to your business needs and drive growth.