xdp-balancer not found

[slabastrou]

root@katran-big:/home/syla/katran# ./os_run_tester.sh

• '[' -z '' ']'
  ++ pwd
• KATRAN_BUILD_DIR=/home/syla/katran/_build/build
• '[' -z '' ']'
  ++ pwd
• DEPS_DIR=/home/syla/katran/_build/deps
• sudo sh -c '/home/syla/katran/_build/build/katran/lib/testing/katran_tester -balancer_prog /home/syla/katran/_build/deps/bpfprog/bpf/balancer_kern.o -test_from_fixtures=true '
  libbpf: Error loading ELF section .BTF: -22.
  E0212 21:58:01.396488 1322 BpfLoader.cpp:97] Can't find prog with name: xdp-balancer
  terminate called after throwing an instance of 'std::invalid_argument'
  what(): can't get fd for prog: xdp-balancer, error: Invalid argument
  Aborted (core dumped)

[udippant]

Did the script to build (https://github.com/facebookincubator/katran/blob/master/build_katran.sh) run successfully including the build_bpf_modules_opensource .sh https://github.com/facebookincubator/katran/blob/master/build_katran.sh#L460 ?

[slabastrou]

I am deploying an a fresh Ubuntu 18.04 Server VM (with latest upgrades) and I am able to fully compile (build_kratran and build_bpf) without errors. I can confirm that If I don't execute build_bpf, it fails. We also saw some occurence where restarting katran will fail until I execute build_bpf_... again.

So. looks like build_bpf must be executed manually before execution.

[slabastrou]

I tried in a different instance and even after executing build_bpf, it still fails. Looks like something somehow random.