13.3. 部署和测试场景示例

流程

1. 使用以下参数创建 compute-real-time.yaml 文件：

   parameter_defaults:
     ComputeRealTimeParameters:
       IsolCpusList: "1"
       NovaComputeCpuDedicatedSet: "1"
       NovaComputeCpuSharedSet: "0"
       KernelArgs: "default_hugepagesz=1G hugepagesz=1G hugepages=16"
       NovaComputeDisableIrqBalance: true

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2. 使用 ComputeRealTime 角色创建一个新的 rt_roles_data.yaml 文件：

   $ openstack overcloud roles generate \
    -o ~/rt_roles_data.yaml Controller ComputeRealTime

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3. 使用其他环境文件将 compute-real-time.yaml 和 rt_roles_data.yaml 添加到堆栈中，并部署 overcloud：

   (undercloud)$ openstack overcloud deploy --templates \
     -r /home/stack/rt_roles_data.yaml \
     -e [your environment files] \
     -e /home/stack/templates/compute-real-time.yaml

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   此命令部署一个 Controller 节点和一个 Real-time Compute 节点。

4. 登录到 Real-time Compute 节点并检查以下参数：

   [root@overcloud-computerealtime-0 ~]# uname -a
   Linux overcloud-computerealtime-0 4.18.0-80.7.1.rt9.153.el8_0.x86_64 #1 SMP PREEMPT RT Wed Dec 13 13:37:53 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
   [root@overcloud-computerealtime-0 ~]# cat /proc/cmdline
   BOOT_IMAGE=/boot/vmlinuz-4.18.0-80.7.1.rt9.153.el8_0.x86_64 root=UUID=45ae42d0-58e7-44fe-b5b1-993fe97b760f ro console=tty0 crashkernel=auto console=ttyS0,115200 default_hugepagesz=1G hugepagesz=1G hugepages=16
   [root@overcloud-computerealtime-0 ~]# tuned-adm active
   Current active profile: realtime-virtual-host
   [root@overcloud-computerealtime-0 ~]# grep ^isolated_cores /etc/tuned/realtime-virtual-host-variables.conf
   isolated_cores=1
   [root@overcloud-computerealtime-0 ~]# cat /usr/lib/tuned/realtime-virtual-host/lapic_timer_adv_ns
   4000 # The returned value must not be 0
   [root@overcloud-computerealtime-0 ~]# cat /sys/module/kvm/parameters/lapic_timer_advance_ns
   4000 # The returned value must not be 0
   # To validate hugepages at a host level:
   [root@overcloud-computerealtime-0 ~]# cat /proc/meminfo | grep -E HugePages_Total|Hugepagesize
   HugePages_Total:      64
   Hugepagesize:    1048576 kB
   # To validate hugepages on a per NUMA level (below example is a two NUMA compute host):
   [root@overcloud-computerealtime-0 ~]# cat /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages
   32
   [root@overcloud-computerealtime-0 ~]# cat /sys/devices/system/node/node1/hugepages/hugepages-1048576kB/nr_hugepages
   32
   [root@overcloud-computerealtime-0 ~]# crudini --get /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova.conf compute cpu_dedicated_set
   1
   [root@overcloud-computerealtime-0 ~]# crudini --get /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova.conf compute cpu_shared_set
   0
   [root@overcloud-computerealtime-0 ~]# systemctl status irqbalance
   ● irqbalance.service - irqbalance daemon
      Loaded: loaded (/usr/lib/systemd/system/irqbalance.service; enabled; vendor preset: enabled)
      Active: inactive (dead) since Tue 2021-03-30 13:36:31 UTC; 2s ago

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