W. Trevor King
34886a79d6
I'd been getting the failed-to-reap errors locally, but on an unrelated pull-request the FAH27 suite successfully reaped that hook [1]: --- FAIL: TestRunKillTimeout (0.50s) assertions.go:226: Error Trace: exec_test.go:210 Error: Expect "signal: killed" to match "^failed to reap process within 0s of the kill signal$" FAIL The successful-reap cases limit our coverage, but I don't think that's a big enough problem to be worth repeated polling or similar until we do get the failed-to-reap error. [1]: https://s3.amazonaws.com/aos-ci/ghprb/projectatomic/libpod/96c1535fdc11b2de24421863d7ad5d3b94338b37.0.1527811547665239762/output.log Signed-off-by: W. Trevor King <wking@tremily.us> Closes: #868 Approved by: rhatdan
OCI Hooks Configuration
For POSIX platforms, the OCI runtime configuration supports hooks for configuring custom actions related to the life cycle of the container.
The way you enable the hooks above is by editing the OCI runtime configuration before running the OCI runtime (e.g. runc).
CRI-O and podman create create the OCI configuration for you, and this documentation allows developers to configure them to set their intended hooks.
One problem with hooks is that the runtime actually stalls execution of the container before running the hooks and stalls completion of the container, until all hooks complete.
This can cause some performance issues.
Also a lot of hooks just check if certain configuration is set and then exit early, without doing anything.
For example the oci-systemd-hook only executes if the command is init or systemd, otherwise it just exits.
This means if we automatically enabled all hooks, every container would have to execute oci-systemd-hook, even if they don't run systemd inside of the container.
Performance would also suffer if we exectuted each hook at each stage (pre-start, post-start, and post-stop).
The hooks configuration is documented in oci-hooks.5.