102.3 Manage Shared Libraries

Question 1

What is a shared library?

Answer 1

• Files containing functionality that other applications can use
• These files and in a .so for shared object
• Found in the following locations on a Linux system
  
  • /lib
  • /usr/lib (for 32 bit systems) and /usr/lib64 (for 64 bit systems)
• /usr/local/lib
• /usr/share

Two types of library files

• Dynamic (ends in .so)
• Statically linked (ends in .a)

Question 2

How do you produce a list of dependencies for a particular binary?

Answer 2

use ldd

Question 3

How do you configure dynamic linker run-time bindings?

Answer 3

ldconfig

Creates a cache based on library directory locations.

Question 4

What is the legacy environment variable that points to a path where library files can be read from?

Answer 4

LD_LIBRARY_PATH

Question 5

What is configuration file that points to a path where library files can be read from?

Answer 5

/etc/ld.so.conf