Module Stresser

Various simple single-purpose containers to stress target a module.

Worker Host prep (once)

Make your test dirs group-owned by the same numeric GID and inheriting group perms:

# Use the same GID you bake into the image (20001 here) 
sudo groupadd -g 20001 stresscontainers   # ok if it already exists 
sudo mkdir -p /var/lib/module-stresser/
sudo chgrp -R 20001 /var/lib/module-stresser/
sudo chmod 2775 /var/lib/module-stresser/

Dont forget to create this stresscontainers group so that every container shares it and has the same permissions.

For the creation of a random junk data big file for the io containers:

openssl enc -aes-256-ctr -pass pass:seed -nosalt \
 </dev/zero | dd of=/var/lib/module-stresser/fio_rand.dat bs=4M oflag=direct status=progress

# Important: ensure group write permissions on the file.
# dd commonly creates the file with 0644 (not writable by group), which breaks write tests.
sudo chgrp 20001 /var/lib/module-stresser/fio_rand.dat
sudo chmod 664 /var/lib/module-stresser/fio_rand.dat

# Optional verification
ls -l /var/lib/module-stresser/fio_rand.dat

Check the first 64 bytes of this newly created file:

xxd -l 64 fio_rand.dat