Difference between revisions of "Debugging"
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Docker keeps images in ... and logs in ... | Docker keeps images in ... and logs in ... | ||
| − | == | + | == Tracing == |
| − | CRIU uses ptrace, so strace can't be used in some cases. perf trace is an alternative way. It isn't so informative, but it is still better than nothing. | + | CRIU uses ptrace(), so strace can't be used in some cases. perf trace is an alternative way. It isn't so informative, but it is still better than nothing. |
== Images == | == Images == | ||
Revision as of 20:30, 11 January 2017
Raise verbosity
Make sure you use the -v4 option for extended logging and find logs in the work/images directories.
Getting core files
If CRIU crashes it's useful to build it with debug info and look into core file.
- build CRIU with debug info
make DEBUG=1 - setup core file generation which depends on distro settings, usually the core generation template is sitting in /proc/sys/kernel/core_pattern, see more details at core.5
Then upload core file into debugger gdb criu core-file and type bt command to fetch a backtrace.
Docker C/R
Docker keeps images in ... and logs in ...
Tracing
CRIU uses ptrace(), so strace can't be used in some cases. perf trace is an alternative way. It isn't so informative, but it is still better than nothing.
Images
The crit tool can help to decode image files into a human readable format.