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Linux Operating System Fundamentals

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Introduction to fundametals of Linux Operating System

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Linux Operating System Fundamentals

  1. 1. Linux Operating System Fundamentals ANSHUL PATEL 1
  2. 2. Agenda  Linux Bootup Process  Linux Services and its supervision with systemctl  Linux Process and Memory Management  Linux FileSystems  Linux Package Management  Linux Kernel Parameters  Linux Shell 2
  3. 3. Linux Boot Process  Why do we need to know about it and what are the use cases?  Automating Cloud Workloads  Debugging Cloud Workloads  Developing Custom VM Images 3
  4. 4. Why Systemctl  Governs the startup sequence of services  Provides declarative way to define dependency between the services  Starts the services in parallel to boost up the startup process  New services can be added via simple configuration files  Provides facility to control resources like CPU, Memory, IO  Provides facility to control restart/failure behaviours of the services 4
  5. 5. Linux Types of Processes Parent process Child process Zombie process Orphan process Daemon process Process niceness 5
  6. 6. Linux Types of Processes 6
  7. 7. Linux Types of Memory Resident/Main Memory Virtual/Swap Memory Buffers/Cache 7
  8. 8. Linux Filesystem Mounting Filesystem Unmounting Filesystem Formatting Filesystem Filesystem inodes 8
  9. 9. Linux FileSystem etc Standardized directory for storing configuration files opt Standardized directory for installing applications home Directory which contain home directory for linux users lib Directory containing 32 bit shared object files lib64 Directory containing 64 bit shared object files var Directory which contains variable files dev Special directory which contains devices files tmp Directory which is accessible by all users proc Special directory which contains process tables 9
  10. 10. Linux Package Management  Adding Package repositories  Installing Packages  Removing Packages  Updating Packages  Listing installed packages 10
  11. 11. Linux Kernel Parameters  Operating performance can be enhanced by tuning corresponding kernel parameters.  For example:  Increase tcp buffers size  Enable Network traffic forwarding  Control Memory swapiness 11
  12. 12. Linux Shell  What and why Linux Shell?  What is shell profile?  What are environment variables? (Especially Path environment variable)  Popular Shells  Bash  Tcsh  C shell  KornShell  Zsh 12
  13. 13. Thank You!! 13

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