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Labs

Troubleshooting Application Issues

In this exercise, you will troubleshoot three different application issues. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 1h 30m
Published
Clock icon Apr 04, 2019

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Table of Contents

  1. Challenge

    Troubleshoot and resolve issues using the `dig`, `host`, and `nslookup` commands.

    Attempt to use dig to look up an IP for linuxacademy.com:

    dig linuxacademy.com

    Use ldd to view the libraries used by dig:

    ldd $(which dig)

    libdns.so.1102 is missing. Use yum to find a package that installs this library:

    yum provides */libdns.so.1102

    Reinstall the bind-libs-lite package:

    yum reinstall -y bind-libs-lite

    Attempt to use dig to look up an IP for linuxacademy.com:

    dig linuxacademy.com

  2. Challenge

    Assess the application /root/memleak_test_app for a memory leak.

    Install valgrind:

    yum install -y valgrind

    Run valgrind against /root/test_app:

    valgrind ./memleak_test_app

    If the app has a memory leak, remove executable permissions:

    chmod -x /root/memleak_test_app

  3. Challenge

    Assess and resolve the issue with /root/example_app.

    Attempt to run the application:

    /root/example_app

    Install strace:

    yum install -y strace

    Run the application again using strace:

    strace /root/example_app

    Create the missing file:

    touch /etc/example.conf

    Run the application again:

    /root/example_app
A Cloud Guru - Labs - Troubleshooting Application Issues
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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