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Picking Glibc Versions at Runtime
Using a glibc version that is different from the system-provided one shouldn't require the use of containers, as I recently heard someone claim. Let's take a look at how dynamic linking works and what the options are.
readelf tells us that the hello_c binary has three different “relocations”: in other words, it has three different “gaps” that need to be patched at runtime with the address of the code that supplies those symbols. As a final note, see how I chose to invoke the dynamic linker explicitly —just as the kernel would do when asked to launch a dynamically-linked binary—instead of directly running hello_c. Unix has been around for a long time and there exist alternate solutions to problems that don’t require full replicas of a functioning system.
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