diff --git a/sources/tech/20191110 How to Create Affinity and Anti-Affinity Policy in OpenStack.md b/sources/tech/20191110 How to Create Affinity and Anti-Affinity Policy in OpenStack.md new file mode 100644 index 0000000000..8e65ed8a02 --- /dev/null +++ b/sources/tech/20191110 How to Create Affinity and Anti-Affinity Policy in OpenStack.md @@ -0,0 +1,214 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Create Affinity and Anti-Affinity Policy in OpenStack) +[#]: via: (https://www.linuxtechi.com/create-affinity-anti-affinity-policy-openstack/) +[#]: author: (Pradeep Kumar https://www.linuxtechi.com/author/pradeep/) + +How to Create Affinity and Anti-Affinity Policy in OpenStack +====== + +In the organizations where the **OpenStack** is used aggressively, so in such organizations application and database teams can come up with requirement that their application and database instances are required to launch either on same **compute nodes** (hypervisor) or different compute nodes. + +[![OpenStack-VMs-Affinity-AntiAffinity-Policy][1]][2] + +So, this requirement in OpenStack is fulfilled via **server groups** with **affinity** and **anti-affinity** policies. Server Group is used control affinity and anti-affinity rules for scheduling openstack instances. + +When we try to provision virtual machines with affinity server group then all virtual machines will be launched on same compute node. When VMs are provisioned with ant-affinity server group then all VMs will be launched in different compute nodes. In this article we will demonstrate how to create OpenStack server groups with Affinity and Anti-Affinity rules. + +Let’s first verify whether your OpenStack setup support Affinity and Anti-Affinity Policies or not, execute the following grep command from your controller nodes, + +``` +# grep -i "scheduler_default_filters" /etc/nova/nova.conf +``` + +Output should be something like below, + +![Affinity-AntiAffinity-Filter-Nova-Conf-OpenStack][1] + +As we can see Affinity and Ant-Affinity filters are enabled but in case if these are not enabled then add these filters in **/etc/nova/nova.conf**  file of controller nodes under “**scheduler_default_filters**” parameters. + +``` +# vi /etc/nova/nova.conf +……………… +scheduler_default_filters=xx,xxx,xxx,xxxxx,xxxx,xxx,xxx,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,xx,xxx,xxxx,xx +……………… +``` + +Save and exit the file + +To make above changes into the effect, restart the following services + +``` +# systemctl restart openstack-nova-scheduler +# systemctl restart openstack-nova-conductor +``` + +Now let’s create OpenStack Server Groups with Affinity and Anti-Affinity Policies + +### Server Group with Affinity Policy + +To create a server group with name “app” for affinity policy, execute the following openstack command from controller node, + +**Syntax:** + +# openstack server group create –policy affinity <Server-Group-Name> + +Or + +# nova server-group-create <Server-Group-Name> affinity + +**Note:** Before start executing openstack command, please make sure you source project credential file, in my case project credential file is “**openrc**” + +Example: + +``` +# source openrc +# openstack server group create --policy affinity app +``` + +### Server Group with Anti-Affinity Policy + +To create a server group with anti-affinity policy, execute the following openstack command from controller node, I am assuming server group name is “database” + +**Syntax:** + +# openstack server group create –policy anti-affinity <Server-Group-Name> + +Or + +# nova server-group-create <Server-Group-Name> anti-affinity + +Example: + +``` +# source openrc +# openstack server group create --policy anti-affinity database +``` + +### List Server Group’s ID and Policies + +Execute either nova command or Openstack command to get server group’s id and their policies + +``` +# nova server-group-list | grep -Ei "Policies|database" +Or +# openstack server group list --long | grep -Ei "Policies|app|database" +``` + +Output would be something like below, + +![Server-Group-Policies-OpenStack][1] + +### [Launch Virtual Machines (VMs)][3] with Affinity Policy + +Let’s assume we want to launch 4 vms with affinity policy, run the following “**openstack server create**” command + +**Syntax:** + +# openstack server create –image <img-name> –flavor <id-or-flavor-name> –security-group <security-group-name> –nic net-id=<network-id> –hint group=<Server-Group-ID> –max <number-of-vms>  <VM-Name> + +**Example:** + +``` +# openstack server create --image Cirros --flavor m1.small --security-group default --nic net-id=37b9ab9a-f198-4db1-a5d6-5789b05bfb4c --hint group="a9847c7f-b7c2-4751-9c9a-03b117e704ff" --max 4 affinity-test +``` + +Output of above command, + +![OpenStack-Server-create-with-hint-option][1] + +Let’s verify whether VMs are launched on same compute node or not, run following command + +``` +# openstack server list --long -c Name -c Status -c Host -c "Power State" | grep -i affinity-test +``` + +![Affinity-VMs-Status-OpenStack][1] + +This confirms that our affinity policy is working fine as all the VMs are launched on same compute node. + +Now let’s test anti-affinity policy + +### Launch Virtual Machines (VMs) with Anti-Affinity Policy + +For anti-affinity policy we will launch 4 VMs, in above ‘openstack server create’ command, we need to replace Anti-Affinity Server Group’s ID. In our case we will be using database server group id. + +Run the following openstack command to launch 4 VMs on different computes with anti-affinity policy, + +``` +# openstack server create --image Cirros --flavor m1.small --security-group default --nic net-id=37b9ab9a-f198-4db1-a5d6-5789b05bfb4c --hint group="498fd41b-8a8a-497a-afd8-bc361da2d74e" --max 4 anti-affinity-test +``` + +Output + +![Openstack-server-create-anti-affinity-hint-option][1] + +Use below openstack command to verify whether VMs are launched on different compute nodes or not + +``` +# openstack server list --long -c Name -c Status -c Host -c "Power State" | grep -i anti-affinity-test +``` + +![Anti-Affinity-VMs-Status-OpenStack][1] + +Above output confirms that our anti-affinity policy is also working fine. + +**Note:** Default Quota for Server group is 10 for every tenant , it means we can max launch 10 VMs inside a server group. + +Use below command to view Server Group quota for a specific tenant, replace the tenant id that suits to your setup + +``` +# openstack quota show f6852d73eaee497a8a640757fe02b785 | grep -i server_group +| server_group_members | 10 | +| server_groups | 10 | +# +``` + +To update Server Group Quota, execute the following commands + +``` +# nova quota-update --server-group-members 15 f6852d73eaee497a8a640757fe02b785 +# nova quota-update --server-groups 15 f6852d73eaee497a8a640757fe02b785 +``` + +Now re-run the openstack quota command to verify server group quota + +``` +# openstack quota show f6852d73eaee497a8a640757fe02b785 | grep -i server_group +| server_group_members | 15 | +| server_groups | 15 | +# +``` + +That’s all, we have successfully updated Server Group quota for the tenant. This conclude the article as well, please do hesitate to share it among your technical friends. + + * [Facebook][4] + * [Twitter][5] + * [LinkedIn][6] + * [Reddit][7] + + + +-------------------------------------------------------------------------------- + +via: https://www.linuxtechi.com/create-affinity-anti-affinity-policy-openstack/ + +作者：[Pradeep Kumar][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://www.linuxtechi.com/author/pradeep/ +[b]: https://github.com/lujun9972 +[1]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 +[2]: https://www.linuxtechi.com/wp-content/uploads/2019/11/OpenStack-VMs-Affinity-AntiAffinity-Policy.jpg +[3]: https://www.linuxtechi.com/create-delete-virtual-machine-command-line-openstack/ +[4]: http://www.facebook.com/sharer.php?u=https%3A%2F%2Fwww.linuxtechi.com%2Fcreate-affinity-anti-affinity-policy-openstack%2F&t=How%20to%20Create%20Affinity%20and%20Anti-Affinity%20Policy%20in%20OpenStack +[5]: http://twitter.com/share?text=How%20to%20Create%20Affinity%20and%20Anti-Affinity%20Policy%20in%20OpenStack&url=https%3A%2F%2Fwww.linuxtechi.com%2Fcreate-affinity-anti-affinity-policy-openstack%2F&via=Linuxtechi +[6]: http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.linuxtechi.com%2Fcreate-affinity-anti-affinity-policy-openstack%2F&title=How%20to%20Create%20Affinity%20and%20Anti-Affinity%20Policy%20in%20OpenStack +[7]: http://www.reddit.com/submit?url=https%3A%2F%2Fwww.linuxtechi.com%2Fcreate-affinity-anti-affinity-policy-openstack%2F&title=How%20to%20Create%20Affinity%20and%20Anti-Affinity%20Policy%20in%20OpenStack