Red Hat NETWORK 4.0.5 - Installationsanleitung PDF herunterladen (Seite 50)

BZ #11024 81

Glance does not fully support a graceful restart yet. Hence, image

transfers that are still in progress will be lost when Glance

services are restarted. This will occur when updating the

openstack-glance package.

The workaround to avoid losing images is to wait for image

transfers that are in progress to complete, before updating the

openstack-glance package or restarting Glance services.

If there are no image transfers in progress during installation of

a new version of the openstack-glance package or during a restart

of the Glance services, then this problem will not occur.

BZ #11024 84

The limit set for Nova processes may be exceeded in very large

deployments. Then a problem may occur where you get AVC denials

for sys_resource and sys_admin while running Nova. For example:

avc: denied { sys_admin } for pid=16497 comm="iptables-save"

capability=21 scontext=unconfined_u:system_r:iptables_t:s0

tcontext=unconfined_u:system_r:iptables_t:s0 tclass=capability

Due to the way process inheritance is set up on Linux, calling

sudo inherits the caller's ulimit. Processes owned by the new UID

are counted against the inherited ulimit. Transitioning to the

iptables domain drops the ability to break the soft ulimit for

number of processes, which causes iptables commands to fail in

certain cases. Currently the limit to the number of processes is

set to 2048 for the Nova user.

While this limit should work for most installations, very large

deployments may need a workaround. The workaround is to increase

the limit by editing the /etc/security/limits.d/91-nova.conf file.

For example, change:

nova soft nproc 2048

to:

nova soft nproc 4096

BZ #11126 32

When using NFS shared storage for Compute instance storage, Red

Hat recommends that you mount the share with the noac or the

lookupcache=none option to prevent NFS clients from caching file

attributes (for details, see the NFS man page). This enables

migration and resizing instances between compute hosts that use

the shared storage, but with slight performance penalties.

Red Hat Ent erprise Linux O penSt ack Plat form 4 Release Not es

4 6

1 2 ... 45 46 47 48 49 50 51 52 53

Keine Kommentare

Red Hat NETWORK 4.0.5 - Installationsanleitung Seite 50