Viewing file:  lve_utils_install.py (1.58 KB) -rw-r--r--
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from defence360agent.contracts.plugins import MessageSink
from defence360agent.utils import (
check_run,
recurring_check,
RecurringCheckStop,
)
from defence360agent.utils.resource_limits import is_lve_active, has_lvectl
class LveUtilsAutoInstaller(MessageSink):
"""
Install lve-utils package on CL with LVE automatically
(according to DEF-11452) to provide tools to limit CPU/IO.
Used tools:
/usr/sbin/lvectl - provided by lve-utils package
/bin/lve_suwrapper - provided by lve-wrappers package
(which is a dependency of lve-utils)
lve-utils package is installed by default on CL,
but for some reason may not exist.
"""
def __init__(self, *, check_period=3600):
self._check_period = check_period
self._task = None
async def create_sink(self, loop):
self._loop = loop
self._task = self._loop.create_task(
recurring_check(self._check_period)(
self._install_lve_utils_if_needed
)()
)
async def shutdown(self):
if self._task is not None:
self._task.cancel()
await self._task
self._task = None
async def _install_lve_utils_if_needed(self):
if not is_lve_active(): # kernel doesn't support lve or it is disabled
# no point trying to install lve-utils
raise RecurringCheckStop()
# suppose that lve should be actived on CL only
if not has_lvectl(): # utilities might have been removed
await check_run(["yum", "-y", "install", "lve-utils"])
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