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Add support for cgroup v2 to the installer memory checker

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Support both the case where there is a limit imposed on the
container and when there isn't.

https://pagure.io/freeipa/issue/8635

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
This commit is contained in:
Rob Crittenden 2021-01-04 13:52:32 -05:00 committed by Florence Blanc-Renaud
parent 279d8b7ec4
commit 176fe83a01
1 changed files with 28 additions and 6 deletions
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34
ipaserver/install/installutils.py
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@ -1072,27 +1072,49 @@ def check_available_memory(ca=False):
Use Kb instead of KiB to leave a bit of slush for the OS
"""
available = None
minimum_suggested = 1000 * 1000 * 1000 * 1.2
if not ca:
minimum_suggested -= 150 * 1000 * 1000
if in_container():
# cgroup v1
if os.path.exists(
'/sys/fs/cgroup/memory/memory.limit_in_bytes'
) and os.path.exists('/sys/fs/cgroup/memory/memory.usage_in_bytes'):
with open('/sys/fs/cgroup/memory/memory.limit_in_bytes') as fd:
limit = int(fd.readline())
with open('/sys/fs/cgroup/memory/memory.usage_in_bytes') as fd:
used = int(fd.readline())
available = limit - used
limit_file = '/sys/fs/cgroup/memory/memory.limit_in_bytes'
usage_file = '/sys/fs/cgroup/memory/memory.usage_in_bytes'
# cgroup v2
elif os.path.exists(
'/sys/fs/cgroup/memory.current'
) and os.path.exists('/sys/fs/cgroup/memory.max'):
limit_file = '/sys/fs/cgroup/memory.max'
usage_file = '/sys/fs/cgroup/memory.current'
else:
raise ScriptError(
"Unable to determine the amount of available RAM"
)
else:
with open(limit_file) as fd:
limit = fd.readline()
with open(usage_file) as fd:
used = int(fd.readline())
# In cgroup v2 if there is no limit on the container then
# the maximum host memory is available. Fall back to the psutil
# method for determining availability.
if limit != 'max':
available = int(limit) - used
if available is None:
# delay import of psutil. On import it opens files in /proc and
# can trigger a SELinux violation.
import psutil
available = psutil.virtual_memory().available
if available is None:
raise ScriptError(
"Unable to determine the amount of available RAM"
)
logger.debug("Available memory is %sB", available)
if available < minimum_suggested:
raise ScriptError(