ansible-test: Set max number of open files in containers to 10240 (#75498)

changelogs/fragments/ansible-test-docker-ulimit.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - ansible-test - Change the maximum number of open files in a test container from the default to ``10240``.

test/lib/ansible_test/_internal/docker_util.py

@@ -37,6 +37,10 @@ DOCKER_COMMANDS = [
     'podman',
 ]
 
+# Max number of open files in a docker container.
+# Passed with --ulimit option to the docker run command.
+MAX_NUM_OPEN_FILES = 10240
+
 
 class DockerCommand:
     """Details about the available docker command."""
@@ -232,6 +236,8 @@ def docker_run(
         # Only when the network is not the default bridge network.
         options.extend(['--network', network])
 
+    options.extend(['--ulimit', 'nofile=%s' % MAX_NUM_OPEN_FILES])
+
     for _iteration in range(1, 3):
         try:
             stdout = docker_command(args, [command] + options + [image] + cmd, capture=True)[0]