SUMMARY:

• Cloud/DevOps Engineer over 7 years of experience in IT industry which includes Amazon web Services, Microsoft Azure, Google cloud, DevOps with Configuration Management tools, Build/ Release Management, application configurations, building, automating, managing, releasing code, and deploying to servers.
• Experienced in designing, deploying and maintaining various multitude applications utilizing in AWS services stack including Elastic Cloud Compute EC2, S3, EBS, EFS, Elastic Bean Stalk, Route 53, VPC, Cloud Front, Dynamo DB, Red Shift, RDS, Key Management Service (KMS), Identity & Access Management (IAM), CloudFormation, Elastic Container Service (ECS), Elastic Load balancing, Elastic Cache, SNS, SQS focusing on high availability, fault - tolerance and auto scaling.
• Experienced in using cloud migration tools like AWS SMS , Snowball , direct connect for migrating data from on-premises data centers to AWS Cloud.
• Experience in configuring and deploying Azure Automation scripts for applications utilizing the Azure stack that including compute, blobs, ADF , Azure Data Lake , Azure Data Factory , Azure SQL , Cloud services and ARM and utilities focusing on Automation .
• Experience in Creating and maintaining containerized micro services and configuring/maintaining private container registry on Microsoft Azure for Hosting Images and using Windows Active Directory to secure an Azure AD domain services managed domain with LDAP.
• Designed, deployed, and maintenance of a full stack Kubernetes environment, running on Google Cloud Platform(GCP) and setup alerting and monitoring using Stack driver in GCP.
• Implemented BLUE GREEN deployment to maintain zero downtime to deploy process in Tomcat , Nginx using Python and Shell Scripts to automate log rotation of logs from web servers and automating administration tasks.
• Maintained and developed Docker images for a tech stack including Cassandra , Kafka , Apache , and several in house written Java services running in Google Cloud Platform(GCP ) on Kubernetes.
• Managed OpenStack Infrastructure upgrades , expansion , scaling , troubleshooting , and debugging for large and medium OpenStack deployment sites and Familiar with OpenStack concepts of user-facing availability zones & administrator facing host aggregates.
• Implemented Micro-services using Pivotal Cloud foundry (PCF) platform build upon Spring Boot Services and created workflows on TeamCity for setting up automated pipelines for CI/CD with PCF.
• Experienced in using OpenShift to easily implement and automate powerful cloud deployment patterns and managing Docker Containers and Kubernetes Clusters.
• Experience in Kubernetes to deploy scale , load balance and manage Docker containers with multiple name spaced versions. Implemented a Docker delivery pipeline allowing for CI/CD of Java tomcat web service containers.
• Created, managed, and performed container-based deployments using Docker images containing Middleware and Applications together and Evaluated Kubernetes for Docker container orchestration.
• Managed Kubernetes charts using Helm , and Created reproducible builds of the Kubernetes applications, managed Kubernetes manifest files and managed releases of Helm packages.
• Experience in working on several Docker components like Docker Engine , Hub , Machine , creating Docker images , compose , Docker registry , handling multiple images primarily for middleware installations and domain configurations.
• Used Ansible and Ansible Tower as Configuration management tool , to automate repetitive tasks, quickly deploys critical applications, and proactively manages change.
• Developed several playbooks using Ansible and deployed applications/services on the client hosts. Worked on Ansible setup , managing hosts file , Using YAML linter , authoring various playbooks and custom modules with Ansible.
• Experience in using Chef attributes , Chef templates , Chef recipes , Chef files for managing the configurations across various nodes.
• Written Chef cookbooks and recipes to Provision several pre-prod environments consisting of Cassandra DB installations, web logic domain creations and several proprietary middleware installations.
• Experience in Automating deployment activities in middleware environment which includes portal applications running on Java using Puppet Master and Agent Nodes , Puppet manifests to automate the installations and deployment tasks in service-oriented architecture (SOA).
• Worked with version control systems like Subversion , GIT , GitHub , Bitbucket including command line applications.
• Worked on creating ANT and MAVEN scripts to build and deploy Java/J2EE , Oracle ADF and Oracle SOA based enterprise applications to WebLogic Application Servers.
• Extensively worked on Jenkins for continuous integration from pulling up the code from version control tools like GIT , SVN , CVS , IBM Clear Case and building Artifacts using build tools like Ant , Maven and Gradle . And deploying them into artifact repositories like Nexus and Maven and automating deployments on Servers using Blade Logic , JBoss , Tomcat , WebSphere and Nginx.
• Experience in working on Jenkins by configuring and maintaining for Continuous Integration (CI) and for End to End automation for all build and deployments. Involved in writing Groovy Scripts for building CI/CD pipeline with Jenkins file, Terraform scripts and CloudFormation Templates.
• Experienced in writing Shell Scripts , Python Scripts , Ruby Scripts , Groovy Scripts and maintaining Different Virtualization environments like VM ware , Vagrant.
• Installed, Configured, Managed Monitoring Tools such as Splunk , Nagios , Zabbix for Resource Monitoring/Network/Monitoring/Log Trace Monitoring.
• Used advanced search engine ELK stack (Elasticsearch, Logstash and Kibana) to process large datasets and visualize the results based on aggregations and filters on structured and unstructured fields.
• Experienced in customizing JIRA projects with various schemas , complex workflows , screen schemes , permission schemes , and notification schemes.
• Linux/Unix system administrator on Red hat EL 4.x, 5.x, 6.x, Debian, CentOS 4.x,5.x, Suse, Oracle Enterprise Linux, FreeBSD, Solaris 8,9,10 and VMware V-Sphere ESX/ESXi environment, VMware Workstation, and Hyper-V Workstation.
• Experience in using various network protocols like HTTP , UDP , TCP , and SMTP , SSH , SFTP , FTP , DNS , Remote Access Protocol, Security management and Security troubleshooting skills.
• Exposed to all aspects of Software Development Life Cycle (SDLC) such as Analysis, Design, Implementation and Testing. Also, specific focus on the build and release of quality software in Waterfall, Agile and Scrum.

TECHNICAL SKILLS:

Cloud Platforms: AWS, Microsoft Azure, Google Cloud Platform, OpenStack. PCF

Build Tools: Ant, Gradle, Maven

Source Code Management: GitHub, GitLab, Subversion, Bitbucket

Continuous Integration: Jenkins, Hudson, GitLab CI, Bitbucket Pipelines, Bamboo

Configuration Management: Chef, Ansible, Puppet

Containerization: Docker, Packer

Linux: RHEL, CentOS, Ubuntu & Debian. Windows 2003/2008.

Programming languages: Java, Shell scripting, Basic Perl, Ruby, Python, Groovy, YAML, PowerShell

Web /Application Servers: Apache Tomcat, NGINX, WebLogic, JBoss, WebSphere, WildFly

Container Orchestration: Kubernetes, Docker Swarm, Apache Mesos, OpenShift

Monitoring: Nagios, Splunk, Zabbix, ELK, New relic, Prometheus.

Network Services: TCP/IP, DNS, NFS, NIS, SSH, DHCP.

Documentation Tools: Media Wiki, Atlassian Confluence, Share point, Jira

PROFESSIONAL EXPERIENCE:

Confidential, Chicago, IL

Sr. DevOps/Cloud Engineer

Responsibilities:

• Involved in AWS Cloud IaaS stage with components EC2 , VPC , ELB , Auto-Scaling , Security Groups , Route53 , IAM , EBS , AMI , RDS , S3 , SNS , SQS , CloudWatch , CloudFormation , CloudFront , and Direct Connect .
• Designed AWS Cloud Formation templates to create custom sized VPC , subnets , NAT to ensure successful deployment of Web applications and database templates and setup and build AWS infrastructure for RDS in CloudFormation JSON templates.
• Worked on setting up the life cycle policies to back the data from Amazon Web Services AWS S3 to AWS Glacier , Worked with various AWS EC2 and S3 CLI tools.
• Worked on AWS Code Deploy and Auto Scaling Groups to implement Blue Green Deployments for the various releases and this methodology is used for reducing time in Production environment.
• Created backup for AMIs of EC2 instances using packer, and critical business data for Disaster Recovery (DR) and upgrading to new instances for performances.
• Setting up Python Lambda functions to pass the logs to CloudWatch and adjust the code accordingly and test it.
• Deployed and monitored applications on various platforms using Elastic Bean Stalk .
• Setting up scalability for application servers using command line interface for Setting up and administering DNS system in AWS using Route53 Managing users and groups using the amazon Identity and Access Management (IAM) .
• Managing and analyzing the petabyte-scalable data and stores snapshots internally in Amazon Simple Storage Service (Amazon S3) by using an encrypted Secure Sockets Layer (SSL) connection using AWS Redshift cluster .
• Used CloudFront to deliver content from AWS edge locations to users, allowing for further reduction of load on front-end servers.
• Used security groups , network ACLs , Internet Gateways , NAT instances and Route tables to ensure a secure zone for organizations in AWS public cloud.
• Experience in writing Bash and Python scripts, Included Boto3 to supplement automation provided by Ansible and terraform for tasks such as encrypting EBS volumes backing AMI's and Scheduling Lambda functions for routine AWS tasks.
• Using Terraform in AWS Virtual Private Cloud to automatically setup and modify settings by interfacing with control layer and responsible to setup Elastic search cluster using Terraform scripts to block all the Spam and Phishing attacks.
• Templated AWS infrastructure as a code using Terraform to build staging and production environments.
• Provisioned the highly available EC2 Instances using Terraform and CloudFormation and wrote new plug-ins to support new functionality in Terraform .
• Involved in migrating on Premises to Windows Azure and built Azure Disaster Recovery Environment and Azure backups from the scratch using PowerShell script.
• Configure Role Based Access Control (RBAC) for Azure Resources and worked in Setting up Hybrid connections between Azure web pass and on-premise SQL databases.
• Automated, Configured and Deployed Instances on Azure environments and in Data centers and migrating on premise to Windows Azure using Azure Site Recovery and Azure backups.
• Worked on Microsoft Azure and performed functions like Creating virtual machines, installing IIS, setting up cloud services and creating SQL databases.
• Provided high availability for IaaS VMs and PaaS role instances for access from other services in the VNet with Azure Internal Load Balancer.
• Managed Clusters using Kubernetes and worked on creating many pods , replication controllers , services , deployments , labels , health checks .
• Worked with Red Hat OpenShift Container Platform for Docker and Kubernetes and used Kubernetes to manage containerized applications using its nodes, Config Maps , selector, Services, and deployed application containers as Pods.
• In OpenShift deployed using replication controllers based on the user defined template called deployment configuration.
• Built Jenkins pipelines to drive all microservices builds out to the Docker registry and then deployed to Kubernetes , Created Pods and managed using Kubernetes .
• Managed local deployments in Kubernetes , creating local cluster and deploying application containers.
• Managing major architecture changes from single server large software system to a distributed system with Docker and Kubernetes orchestration .
• Used Ansible to manage Web applications, Environments configuration Files, Users, Mount points and Packages.
• Enhanced the automation to assist, repeat and consist configuration management using Ansible based YAML scripts.
• Designed and implemented fully automated server build management, monitoring and deployment by using Ansible playbooks and Modules .
• Worked to setup Jenkins as a service inside the Docker swarm cluster to reduce the failover downtime to minutes and to automate the Docker containers deployment without using configuration management tool.
• Worked on several Docker components like Docker Engine , Hub , Machine , Compose and Docker Registry .
• Used Docker to containerize custom web applications and deployed them on Ubuntu instances through Swarm Cluster and automated the application deployment in cloud using Vagrant .
• Setting up Chef Infra , bootstrapping nodes, creating, and uploading recipes, node convergence in Chef SCM and Built Chef Development workflow and best practices around configuration management as well as building a strong and diverse internal Chef community.
• Developed Chef Recipes to configure, deploy and maintain software components of the existing Infrastructure.
• Testing Cookbooks with Test Kitchen and Docker containers even before uploading to chef server.
• Configure Knife to manage chef-server , spin new instances, package installs and config changes on client node.
• Installed Software management (CI/CD) for building automation deployments for upgrades and installs which was carried out by Jenkins.
• Supporting configuration of Jenkins Build pipeline jobs, plug-ins installation with team for configuration of maven multi module jobs.
• Building Jenkins pipelines to drive all micro-services builds out to the Docker registry and then deployed to Kubernetes , Created Pods and managed using Kubernetes .
• Implemented, maintained, and supported reliable, timely and reproducible builds and developed build related scripts in shell for maven builds. Created and modified build configuration files including POM.xml files.
• Involved in release planning and executed the release build request from the project team through JIRA Ticket.
• Used advanced search engine ELK stack (Elasticsearch, Logstash and Kibana) to process large datasets and visualize the results based on aggregations and filters on structured and unstructured fields.
• Created Log collection in ELK (Elastic Search, Logstash, Kibana) installed Filebeat on all nodes in cluster to send log data to Logstash. Applied filters on log data before sending to Elasticsearch.
• Created policies and procedures for troubleshooting Circuits, SSL migration and account lockouts.
• Used Splunk to monitoring/metric collection for applications in a cloud-based environment.
• Installed, tested, and deployed monitoring solutions with Splunk services and deployment Server Topologies in Splunk.

Environment: EC2, VPC, ELB, Auto-Scaling, Route53, IAM, EBS, AMI, RDS, S3, SNS, SQS, CloudWatch, CloudFormation, CloudFront, AZURE, Docker, Kubernetes, Chef, Ansible, Terraform, Linux, Jenkins, Maven, Nexus, Nginx, ELK, GIT, Jira, Shell Scripts, PowerShell Scripts, JSON, Ruby, Groovy, Unix/ Linux environment, Vagrant.

Confidential, Pittsburgh, PA

AWS/DevOps Engineer

Responsibilities:

• Worked on the migration from VMware to AWS and used Chef to automate the infrastructure in AWS by creating EC2 , S3 , RDS , VPC and Route 53 
• Provisioned AWS EC2 , EBS , Trusted advisor, S3 , CloudWatch , CloudFront , IAM , Security groups and auto scaling.
• Configured an AWS Virtual Private Cloud (VPC) and Data Base subnet group for isolation of resources within AWS RDS .
• Create AWS MFA for instance RDP/SSH login, worked on security groups and IAM policies to meet security audit & compliance requirements.
• Assigned AWS elastic IP addresses to work around host or availability zone failures by quickly re-mapping the address to another running instance.
• Created Python script to manage resources deployed on AWS using AWS API calls and used Amazon S3 to backup database instances periodically to save snapshots of data.
• Configured Access for inbound and outbound traffic RDS DB services , DynamoDB tables , EBS volumes to set alarms for notifications or automated actions.
• Designed GCP Cloud Formation templates to create custom sized VPC, subnets, NAT to ensure successful deployment of Web applications and database templates.
• Involved in Build and configure a virtual data center in the Google cloud platform to support Enterprise Data Warehouse hosting including Virtual Private Cloud (VPC), Public and Private Subnets, Security Groups, Route Tables, Google Cloud Load Balancing.
• Worked on GCP cloud services such as Compute, auto-scaling and VPC to build secure, highly scalable and flexible systems that handled expected and unexpected load bursts.
• Maintained the user accounts (IAM), Cloud SQL, Cloud DNS, VPC, RDB, Cloud Datastore Cloud Bigtable, SES, SQS and Cloud Pub/Sub services in Google cloud platform.
• Migrated Blob Storage for document and media file, Table storage for structured datasets, Queue storage for reliable messaging for workflow processing and file storage to share file data.
• Created resource groups using resource manager which allow to see cost/billing and monitoring information for resources within a resource group.
• Executed Kubernetes locally with MiniKube , Created local clusters and deployable application containers.
• Configured Docker file with different artifacts to make an image and deploy Docker image to install the application on an instance, maintain and troubleshoot for any user issues or network problems.
• Scheduled, Deployed and Managed container replicas onto a node cluster using Kubernetes .
• Deployment Automation of all microservices to pull image from private Docker registry and deploy to Kubernetes Cluster.
• Virtualized the servers using the Docker for the TEST environment, DEV-environment needs and created Docker images using Docker file and configured Docker Containers .
• Used Docker-Compose tool for defining and running multi-container Docker applications. Written YAML files to configure application’s service.
• Automation/Configuration management using Ansible , created playbooks in YAML to automate the development processes.
• Deployed and configured Chef Server including bootstrapping of Chef Client nodes for provisioning. Created roles , recipes , cookbooks , and data bags for server configuration.
• Implemented the setup for Master slave architecture to improve the Performance of Jenkins and Implemented a CD pipeline involving Jenkins and GIT to complete the automation from commit to deployment.
• Run Jenkins on-top of Kubernetes to drive all automation with web-hooks tied into our GIT system. Used most recent pipeline/multi-branch usefulness for dealing with all stages of pipeline by means of Jenkinsfile written in Groovy .
• Branching , tagging , and maintaining the version control and source code management tools like GIT (GitHub/GitLab) and resolved code merging conflicts in collaboration with application developers provided consistent environment.
• Used Nagios as a monitoring tool to identify and resolve infrastructure problems before they affect critical processes and worked on Nagios Event handlers in case of automatic restart of failed applications and services.
• Responsible for creating user , group creation , monitoring and maintaining log for system status/health using Linux commands and Nagios system monitor .
• Developed multiple Python , Ruby and Shell scripts for various companywide tasks in different environments.
• Created JIRA issues to prioritize and take an action on what's important and stayed up to date with what's going on around the project.

Environment: EC2, VPC, ELB, Route53, IAM, EBS, AMI, RDS, S3, SNS, SQS, CloudWatch, CloudFormation, CloudFront, GCP, Docker, Kubernetes, Chef, Ansible, Terraform, Linux, Jenkins, Maven, Nexus, Nagios, GIT, Jira, Shell Scripts, PowerShell Scripts, YAML, Groovy, Ruby, Python, Windows, Unix/Linux environment.

Confidential, Montvale, NJ

DevOps Engineer

Responsibilities:

• Configured Amazon EC2 instances and launched the new instances with the same configuration using AMIs (Amazon Machine Images).
• Installing new applications on AWS EC2 instances and configured storage on EBS volumes.
• Managed Amazon Web Services (AWS) projects while coaching the agile process and help implement the agile methodology.
• Launching Amazon EC2 Cloud Instances using Amazon Images (Linux/ Ubuntu) and Configuring launched instances with respect to specific applications.
• Hands on experience with IAM to set up user roles with corresponding user and group policies using JSON .
• Perform S3 buckets creation, policies and IAM role-based policies .
• Designed roles and groups for users and resources using AWS Identity Access Management (IAM) .
• Installed and configured an automate tool Puppet that included the installation and configuration of the Puppet master , agent nodes and an admin control workstation.
• Established Puppet Best practices approaches to systems deployment with other tools and managing Puppet as a unit of software deployment and independently version controlled.
• Developed Puppet modules to automate deployment, configuration, and lifecycle management of key clusters .
• Developed Puppet scripts for an automated server provisioning and Docker images for isolation, reducing the time between provisioning and deployment from over 4 hours to less than 15 minutes.
• Used Chef as Configuration management tool, to automate repetitive tasks, quickly deploys critical applications, and proactively manages change.
• Developed Chef Recipes to configure, deploy and maintain software components of the existing Infrastructure.
• Implied in testing Cookbooks on different platforms using Chef Kitchen .
• Designed and implemented Chef , including the internal best practices, cookbooks, automated cookbook CI and CD system.
• Worked on infrastructure with Docker containerization and collaborated with development support teams to setup a continuous delivery environment with the use of Docker. Created Docker images using a Docker file , worked on Docker container snapshots , managing Docker volumes , and experienced with Docker container service .
• Migrated projects from Subversion repositories to GitHub Enterprise repositories through Team Foundation server (TFS) to synchronize task/work item tracking process.
• Deployed Nagios XI in the environment to look up Monitoring server and network infrastructure using Nagios .
• Responsible for installing Jenkins master and slave nodes. Configured Git with Jenkins and schedule jobs using POLL SCM option and Installed GRUNT , SonarQube on sandbox and installed plugins basing on developer requirements.
• Built scripts using ANT and MAVEN build tools in Jenkins to move from one environment to other environments.
• Implemented a GIT mirror for SVN repository, which enables users to use both GIT and SVN .
• Deployed Java Enterprise applications to Apache Web Server, JBoss Application server and used Python scripting for automation, highly scalable, build promotions for staging to production.
• Worked with JIRA for creating Projects, assigning permissions to users and groups for the projects and Created Mail handlers and notification Schemes for JIRA .

Environment: EC2, EBS, IAM, Docker, Puppet, Chef, Linux, Jenkins, Team Foundation Server, ANT, Maven, Nexus, Nginx, ELK, GIT/GitHub, Jira, Shell Scripts, PowerShell Scripts, Python, Grunt, Apace, JBoss, Unix/ Linux environment, Vagrant

Confidential

Build and Release Engineer

Responsibilities:

• Provided detailed documentation of complex build and release process, MOPs , build cycles and calendars including creating build reports and Release notes.
• Responsible for Deployment Automation using multiple tools Chef, Jenkins, GIT, ANT Scripts.
• Integrated GIT into Jenkins to automate the code check-out process and developed build and Tuning of kernel parameters deployment scripts using ANT , and MAVEN as build tools in Jenkins to move from one environment to other environments.
• Worked on setting up Upstream and Downstream Jobs Jenkins and Hudson . Worked with Jenkins Pipelines .
• Used Ant as build tool on Java projects for the development for building artifacts using the source code. Deployed the Java applications into web application servers like Web logic .
• Providing CM and Build support for different applications built and deployed to lower and higher environments and Implemented CM and Release Management Processes, Policies and Procedure.
• As a Linux administrator, primary responsibility includes building of new servers which includes rack mounting, installation of OS , configuring of various OS and third-party tools, securing OS , installing, configuring, and scheduling Cron jobs.
• Managed and installed software packages using YUM and RPM and created repository files for offline servers.
• Components and upgrading VMware Tools. Migration of ESXi host and VM's across datacenters. Implemented software enabled raid configuration (LVM).
• Configured LVM (Logical Volume Manager) to manage volume group, logical and physical partitions and importing new physical volumes.
• Built Version Controlled Java code on Clear Case Unified Change Management (UCM) Project Based code streams utilizing Visual Build Pro (VBP) and ANT scripts.
• Responsible for the development and maintenance of process and associated scripts/tools for automated Build , Testing and Deployment of the products to various developments.
• Installed, deployed Red Hat Enterprise Linux 6.x/7.x , CentOS and installation of packages, patches.
• Integrating the latest available changes/components to the product software and planning and managing every build on a schedule.
• Resolved update, merge and password authentication issues in Jenkins and Jira .
• Analyze and resolve compilation and deployment errors related to code development , branching , merging , and building of source code.
• Used SVN to check in the Selenium test script and executed the Selenium scripts using Jenkins/Maven plug-in.
• Familiar with some of the leading Project management tools like Base camp and Atlassian tools. Provided extended support to development and QA team for troubleshooting build failures by keeping track of build logs and communicating the same effectively.

Environment: ANT, MAVEN, Apache & Tomcat, GIT, SVN, shell & Perl scripting, Subversion, Hudson, Jenkins, Oracle Enterprise Linux, Solaris, chef, VMware

Confidential

Linux Administrator

Responsibilities:

• Configured and integrated Linux servers to authenticate with Windows LDAP services, built complete LINUX LDAP server and integrated Linux users to authenticate to Linux LDAP server, imported and exported users as needed between various directories.
• Installation, configuration, and administration of RedHat Linux servers and support for Servers.
• Monitored System Activities like CPU, Memory, Disk and Swap space usage to avoid any performance issues.
• Installation and administration of TCP/IP, NFS, DNS, NTP , Auto mounts, send mail and print servers as per the client's requirement.
• Merged generated reports as per request. Formatted data into required format using UNIX Shell Scripts , SED and Awk .
• Configured Logical Storage Manager (LSM) for root disk encapsulation and implemented root disk mirroring for fault tolerance. NIS, NFS, AUTOFS, NTP Configuration and Administration.
• Monitored CRON jobs that were scheduled by the development team. Provided 24*7 support, during production pushes and provided end user support.
• Configured secure http, for SVN source control, and back-end communication with Progressa & SQL Database.
• Administration of RHEL 6.x/5.x , Solaris which includes installation, testing, tuning, upgrading , and applying patches, troubleshooting both physical and virtual server issues.
• Created Solaris Jumpstart and Linux Kick start servers and processes to automate and standardize the installation process, reducing Installation time by 35% and post-installation errors by 50%.
• Deployed and implemented NIS, DHCP and DNS environment and implemented and maintained Proxy Server under Linux issues regarding Samba Servers and perform hardware and software installs/upgrades.
• Perform daily system monitoring, verifying the integrity and availability of all hardware, server resources, systems, and key processes, reviewing system and application logs, and verifying completion of scheduled jobs such as backups.
• Writing shell scripts for automation of daily tasks, documenting the changes that happen in the environment and in each server, analyzing the error logs, analyzing the user logs, analyzing the /var/log/messages.

Environment: RHEL 4/5, CentOS, SVN, TCP/IP, NFS, DNS, NTP, LSM