June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Making updates fail-safe
The next problem to consider is that of recovering from an update that was installed correctly, but which contains code that stops the system from booting. Ideally, we want the system to detect this case and to revert to a previous working image.
There are several failure modes that can lead to a non-operational system. The first is a kernel panic, caused for example by a bug in a kernel device driver, or being unable to run the init program. A sensible place to start is by configuring the kernel to reboot a number of seconds after a panic. You can do this either when you build the kernel by setting CONFIG_PANIC_TIMEOUT or by setting the kernel command line to panic. For example, to reboot 5 seconds after a panic, ...
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