Nova
Get all servers on a node
openstack --os-cloud admin server list --all-projects --host testbed-node-0
Stop all servers running on a node
for server in $(openstack --os-cloud admin server list --all-projects --host testbed-node-0 --vm-state active -f value -c ID | tr -d '\r'); do
echo stopping server $server
openstack --os-cloud admin server stop $server
sleep 2
done
Disable & enable a compute service
openstack --os-cloud admin compute service set --disable --description MAINTENANCE testbed-node-0 nova-compute
openstack --os-cloud admin compute service list --long
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| ID | Binary | Host | Zone | Status | State | Updated At | Disabled Reason | Forced Down |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| b77c5aeb-91c0-4972-84ea-7c8bd5a49fdd | nova-compute | testbed-node-0 | nova | disabled | up | 2023-12-14T14:20:24.000000 | MAINTENANCE | False |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
openstack --os-cloud admin compute service set --enable testbed-node-0 nova-compute
openstack --os-cloud admin compute service list
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+
| ID | Binary | Host | Zone | Status | State | Updated At |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+
| b77c5aeb-91c0-4972-84ea-7c8bd5a49fdd | nova-compute | testbed-node-0 | nova | enabled | up | 2023-12-14T14:22:54.000000 |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+
Force down & up a compute service
openstack --os-cloud admin --os-compute-api-version 2.12 compute service set --down testbed-node-0 nova-compute
openstack --os-cloud admin compute service list --long
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| ID | Binary | Host | Zone | Status | State | Updated At | Disabled Reason | Forced Down |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| b77c5aeb-91c0-4972-84ea-7c8bd5a49fdd | nova-compute | testbed-node-0 | nova | disabled | down | 2023-12-14T14:21:47.000000 | None | True |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
openstack --os-cloud admin --os-compute-api-version 2.12 compute service set --up testbed-node-0 nova-compute
openstack --os-cloud admin compute service list --long
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| ID | Binary | Host | Zone | Status | State | Updated At | Disabled Reason | Forced Down |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
| b77c5aeb-91c0-4972-84ea-7c8bd5a49fdd | nova-compute | testbed-node-0 | nova | disabled | up | 2023-12-14T14:20:24.000000 | None | False |
+--------------------------------------+----------------+-----------------+----------+----------+-------+----------------------------+----------------------------------------------------+-------------+
Huge pages
$ grep Huge /proc/meminfo
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
FileHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
$ sudo sudo hugeadm --pool-list
libhugetlbfs: ERROR: Line too long when parsing mounts
Size Minimum Current Maximum Default
2097152 0 0 0 *
1073741824 0 0 0
/etc/default/grub
GRUB_CMDLINE_LINUX="default_hugepagesz=1G hugepagesz=1G hugepages=512 transparent_hugepage=never"
update-grub
reboot
$ grep Huge /proc/meminfo
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
FileHugePages: 0 kB
HugePages_Total: 512
HugePages_Free: 512
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 1048576 kB
Hugetlb: 536870912 kB
$ sudo hugeadm --pool-list
libhugetlbfs: ERROR: Line too long when parsing mounts
Size Minimum Current Maximum Default
2097152 0 0 0 *
1073741824 512 512 512
Quality of Service (QoS)
Host aggregates
Host aggregates can be managed with the playbook. The playbook is used with
osism apply -e openstack host-aggregates.
Further arguments for host aggregates can be found in the documentation for the openstack.cloud.host_aggregate Ansible module.
environments/openstack/playbook-host-aggregates.yml
---
- name: Manage host aggregates
hosts: localhost
connection: local
vars:
host_aggregates:
- name: aggregate1
hosts:
- host1
- host2
- host3
tasks:
- name: Create host aggregate
openstack.cloud.host_aggregate:
cloud: admin
state: present
name: "{{ item.name }}"
hosts: "{{ item.hosts }}"
loop: "{{ host_aggregates }}"