Unix sunsolaris admin

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Overview: UNIX is an operating system which was first developed in the 1960s, and has been under constant development ever since. By operating system, we mean the suite of programs which make the computer work. It is a stable, multi-user, multi-tasking system for servers, desktops and laptops.UNIX systems also have a graphical user interface (GUI) similar to Microsoft Windows which provides an easy to use environment. ABOUT ECORPTRAININGS: Ecorp Trainings are one of the best institute providing quality level of training in E-learning process.This is instructor led online training. We also provide corporate training , if group of people interested in same technology. Contact us for detailed course content & register for a free demo. We also provide support in client interviews , resume preparation , ticket resolving. Contact us for custom designed training course by experts exclusively for yourself. We provide training for almost all IT technologies i.e ; JAVA , DOTNET , SAP ,ORACLE , PEOPLESOFT ,HYPERION etc, contact us if you have any particular need. ECORP TRAININGS. Gtalk ID : ecorptrainings Skype ID : ecorptrainings

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10 Linux and UNIX Interview Questions and Answers asked in Wipro TCS Capegemini UNIX and Linux Interview Questions and Answers Questions from various UNIX operating systems e.g. Solaris, Linux, IBM AIX or any other UNIX operating system is asked on different support and programming interviews. I have always seen few interview questions from Linux and UNIX along with SQL in almost every Java programming interviews. You just can not afford not to prepare questions from UNIX and Linux until your Job absolutely doesn't require any work in UNIX operating system. I have collected many UNIX command interview questions and already shared them but I found that except system admin jobs, many programming job interviews only focus on general UNIX commands e.g. chmod, find or grep and fundamentals like finding files and directories, managing file space, networking commands, checking process status and managing file permissions. In this article we will see such kind of frequently asked interview questions and answers from UNIX and Linux operating System. Questions are very fundamental in nature and not limited to Linux only and equally applicable to other UNIX operating systems e.g. Solaris, IBM AIX etc. Many of these UNIX questions are asked during various interviews on companies like TCS, Infosys, Citibank , Wipro, Capegemini and Tech Mahindra. But as I said they are very fundamental and can be asked in any company. UNIX and Linux Interview questions answers

10 Linux and UNIX Interview Questions and Answers asked in Wipro TCS Capegemini UNIX and Linux Interview Questions and Answers Questions from various UNIX operating systems e.g. Solaris, Linux, IBM AIX or any other UNIX operating system is asked on different support and programming interviews. I have always seen few interview questions from Linux and UNIX along with SQL in almost every Java programming interviews. You just can not afford not to prepare questions from UNIX and Linux until your Job absolutely doesn't require any work in UNIX operating system. I have collected many UNIX command interview questions and already shared them but I found that except system admin jobs, many programming job interviews only focus on general UNIX commands e.g. chmod, find or grep and fundamentals like finding files and directories, managing file space, networking commands, checking process status and managing file permissions. In this article we will see such kind of frequently asked interview questions and answers from UNIX and Linux operating System. Questions are very fundamental in nature and not limited to Linux only and equally applicable to other UNIX operating systems e.g. Solaris, IBM AIX etc. Many of these UNIX questions are asked during various interviews on companies like TCS, Infosys, Citibank, Wipro, Capegemini and Tech Mahindra. But as I said they are very fundamental and can be asked in any company. UNIX and Linux Interview questions answers

Type Computer Maples IT Technologies provides Exclusive Training on IBM MQ ADMIN by Faculty from top MNC’s with highly skilled domain expertise will train & guide you with real time applications and case studies. We also help you in resume preparation and provide job assistance till you get job. DURATION: 30 Days TOTAL: 30 Hours IBM Websphere Message Queues Admin Version 7.1 FACULTY: Satish(7 Years Real Time Expert) COURSE CONTENT: 1.BASIC INFO & MQ OVERVIEW 2. MESSAGE OVERVIEW 3. MQ BENFITS & MQ CHARACTERISTICS 4. MQ INSTALATIONS/UNINSTALATIONS 5.MIGRATION 6. FILE SYSTEM 7. MQ OBJECTS 8. MQ COMMANDS 9. MQI CALLS 10. RUNMQSC MODES & SCRIPT FILES 11. DISTRIBUTED QUEUE MANAGEMENT 12. TRIGGERING OVERVIEW & TYPES 13. LOGS, LOGGING & TROUBLE SHOOTING 14. REMOTE ADMINISTRATION &COMMAND SERVER OVERVIEW 15. MQI CHANNELS 16. CONFIGURATION FILES OVERVIEW 17. SECURITY & SSL COFIGURATION 18. CLUSTERING 19. CONFIGURATION BACKUP & MESSAGES BACKUP 20. DEADLETTER HANDLER 21. BASIC UNIX COMMNDS 22. RPM TOLL USAGE & FTP BASIC COMMANDS 23. UNIX SERVER CONNECTION TOOLS & UTILITIES 24. MONITORING TOOLS 25. TICKETING TOOLS 26. Publish/Subscribe Overview & Miscellaneous Concepts

I often get mails from people asking what are the questions generally asked in Weblogic by interviewers. Generally for an Administrator’s positions, in addition to Weblogic questions, there are a lot of Unix questions and a few questions related to process and case handling. These are the important questions that I cover while interviewing. 1. How do you differentiate between a server hang and server crash issue? When a Server crahes, the JAVA process no longer exists. When the Server is hung, it stops responding. We can use the weblogic.ADMIN utilty to ping the server. In case of a hang situation we can take multiple thread dumps and analyze the cause of hang. 2. What can be the various reasons for a server crash? a) Native IO b) SSL Native Libraries c) JVM d) Supported Configuration e) JDBC Driver issue 3. How do you troubleshoot a crash? JVM crash generates a hs_err_pid file. We need to look into the stack trace of the hs_err_pid file . If the thread is from a native io, we need to disable native io. if the stack trace is from the driver, we need to get in touch with the drive team. Quite possibly its a problem with driver. Changing the type of driver can be a workaround. If the thread shows it coming from an optimzed code, we can turn of optimization. If the stack is from native calls of application, its a bug with the application and it has to b modified. 4. Ho do you troubleshoot Server Hang? We can use java weblogic.Admin PING to check if we get a normal response. We need to take multiple thread dumps with kill -3 pid on unix and CTLR Break on Windows. Analyze the thread dump to find the root cause. 5. What can be the reasons of Server hang? Memory leak, databse query taking a long time to return, Deadlock. 6. What is memory leak? Memory leak is when objects are not romved from the heap even when they are not required. 7. What are the various causes for OUT OF MEMORY? a) Insufficient heap size, not able to match the extra load. b) Objects licing too long, like HTTP Sessions. c) Memory leak in application code. d) Full GC not happening due to JVM Bug. 8. How to troubleshoot and overcome such issues? Gather memory data by enabling GC verbose. If its due to Http Session, timing out http session after certain interval might help. Look into the code for jdbc connection handling. Optimizing the heap size according to the load. 9. When does High CPU Usage occur? It occurs when one process or one thread utilizes unexpectedly high proportion of CPU. 10. How to troubleshoot it? In Solaris environment, we need to take pstack and prstack and see what the threads are doing. In Windows we need to use pslist and process explorer. 11. What is Clustering and what is achieved through it? Clustering is the grouping together of servers for the purpose of high availability and scalability. Load balancing and Failover is achieved. 12. How does Cluster Communication Happen? Members of the Cluster communicate over the Cluster Multicast IP and Port by sending periodic heart beat messages. 13. What is the difference between the Sun JVM and BEA JRockit JVM? The most well know JVM is the implementation from Sun. The Sun JVM is called HotSpot. The Sun JVM is shipped in the Java Developer’s Kit (JDK) and Java Runtime Environment (JRE) from Sun. The BEA JRockit JVM from BEA systems is optimized for reliability and performance for server side applications. To achieve this, BEA JRockit JVM uses technologies such as code generation, hot spot detection, code optimization, advanced garbage collection algorithms and tight operating system integration. 14. TUning JVM Parameters. If you have a single processor, single thread machine then you should use the serial collector (default for some configurations, can be enabled explicitly for with -XX:+UseSerialGC). For multiprocessor machines where your workload is basically CPU bound, use the parallel collector. This is enabled by default if you use the -server flag, or you can enable it explicitly with -XX:+UseParallelGC. If you’d rather keep the GC pauses shorter at the expense of using more total CPU time for GC, and you have more than one CPU, you can use the concurrent collector (-XX:+UseConcMarkSweepGC). Note that the concurrent collector tends to require more RAM allocated to the JVM than the serial or parallel collectors for a given workload because some memory fragmentation can occur.

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WAS Administration 7.0 & 8.5 1.WAS Introduction WAS Versions Use of JVM’s 3-tier architecture Overview of profiles in WAS 7.0 Usage of VM, DNS, Monitoring tools, TSM and Storage Overview of WAS architecture 2.WAS 7 Installation Installation overview OS Pre-requisites GUI Installation Silent Installation Installation verification 3.Profiles Profile types and their details Profile creation using GUI Profile creation using command line Profile creation verification using logs Start and stop of stand-alone JVM instances. Accessing the console of JVM’s 4.Working with Standalone Application Server Managing the Application Server Profile Application Server Configuration Viewing the status of the application Server Starting and Stopping of an application Server Viewing runtime attributes of an application Server 5.Federation Overview of federation Types of federation Network pre-requisites of federation GUI federation Command line federation Federation verification using logs 6.File Synchronization Overview of synchronization Pre-requisites of synchronization Different modes of synchronization Managed node Vs Unmanaged node Synchronization verification using logs 7.Work Load Management and High Availability What is clustering Horizontal and vertical clustering Distributed Server Configuration Creating and configuring the cluster Basic WLM request routing mechanism Configure Virtual Host and Host aliases Viewing the status of the cluster Starting and Stopping cluster and node agent. 8.Virtual host Default host Admin host Proxy host 9.DB Connectivity Overview of application accessing database JDBC Provider Data Source JAAS Configuration Test db connectivity using admin console, network command and logs 10.Application installation Modes of ear deployment EAR deployment using admin console Start and Stop applications Application auto start Viewing EJB and WEB modules Accessing the application Deployment descriptor Viewing the logs related to application Updating the application 11.PMR Over view of PMR Contact IBM to raise PMR PMR escalation matrix 12.Fix pack installation Overview of fix pack IBM WebSphere fix pack downloading Install Update installer in GUI and Silent mode Install and Uninstall fixpack using GUI and Silent mode Fix pack installation verification logs Fix pack version check commands Backup and restore of the WebSphere configuration 13.WAS Security Mechanisms WAS Security overview Types of realms Configure security using standalone and federated repository Security ON&OFF User roles and groups 14.Managing web server with WAS Overview of web servers Installation of IBM HTTP Server(IHS) Installation verification IHS Start & Stop commands IHS as unmanaged node IHS as managed node IBM HTTP Admin server IHS Configuration and log files 15.IBM Plug-in Overview of IBM Plug-in Installation of IBM Plug-in Installation verification Configure IHS with plug-in and WAS Generate and propagate plugin-cfg.xml Plugin-cfg.xml in detail Logs of IBM Plug-in 16.SSL Overview of SSL Creating Self signed certificate Installing the self signed certificate in IBM HTTP Server Create a certificate request of 3rd party certificates Installing 3rd party certificates in IBM HTTP Server 17. Troubleshooting WebSphere Application Server Logs Enabling logging and traces Process Logs Generating heap dumps and thread dumps Enabling verbose GC IBM Support Assistant(ISA) 18.WSADMIN Invoking wsadmin Wsadmin administrative objects (AdminTask, AdminApp, AdminConfig and AdminTask) Invoking Jacl and Jython scripts using wsadmin 19.Performance monitoring Overview of monitoring tools PMI Overview Configure WAS with CA Wily Introscope 20.UNIX commands related to WAS troubleshooting 21.WAS 8.5 IBM Installation Manager overview Install IIM Install WAS 8.5 Creating profiles and federation Install IHS and Plug-in Configure HIS with Plug-in and WAS using IBM Customization toolkit 22.ITIL Process PERSONAL ASSISTANCE Resume Preparation Soft Copy Material/ FAQ’s Repository Mock Interviews Advanced Topics Interview Questions

sadguru technologies 8179736190 040~40154733 Description for UNIX/LINUX ADMINISTRATION training in usa uk We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic and SOA Admin, JAVA, Call center Training, SCM Classroom and Online,BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 1 year. Special Feature We are providing 24/7 Online Lab facility, Student can connect from home to do the LAB practical. Offered Courses 1. Oracle SOA Suite11g/BPEL Normal Track, Fast Track and Online training 2. Oracle AIA 3.0, ADF and OSB training 3. SOA and Web Logic Administration training

sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 1 year. Special Feature: We are providing 24/7 Online Lab facility, Student can connect from home to do the LAB practical. Offered Courses: 1. Oracle SOA Suite11g/BPEL (Normal Track, Fast Track & Online) training 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain Management)

sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 1 year. Special Feature: We are providing 24/7 Online Lab facility, Student can connect from home to do the LAB practical. Offered Courses: 1. Oracle SOA Suite11g/BPEL (Normal Track, Fast Track & Online) training 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain

sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain Management)