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on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-start-a-VM-from-a-snapshot-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to start a VM from a snapshot on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Status-Power-State-and-dependences-in-billing-of-instances-VMs-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Status Power State and dependencies in billing of instance VMs on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-upload-your-custom-image-using-OpenStack-CLI-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to upload your custom image using OpenStack CLI on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/VM-created-with-option-Create-New-Volume-No-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> VM created with option Create New Volume No on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/VM-created-with-option-Create-New-Volume-Yes-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> VM created with option Create New Volume Yes on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/What-is-an-OpenStack-domain-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> What is an OpenStack domain on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/What-is-an-OpenStack-project-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> What is an OpenStack project on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-create-a-Linux-VM-and-access-it-from-Windows-desktop-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create a Linux VM and access it from Windows desktop on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a 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3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-start-a-VM-from-instance-snapshot-using-Horizon-dashboard-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to start a VM from instance snapshot using Horizon dashboard on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/How-to-create-a-VM-using-the-OpenStack-CLI-client-on-3Engines-Cloud-cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create a VM using the OpenStack CLI client on 3Engines Cloud cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/OpenStack-user-roles-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> OpenStack User Roles on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Resizing-a-virtual-machine-using-OpenStack-Horizon-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Resizing a virtual machine using OpenStack Horizon on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../cloud/Block-storage-and-object-storage-performance-limits-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Block storage and object storage performance limits on 3Engines Cloud </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_3> <label class=md-nav__link for=__nav_3 id=__nav_3_label tabindex=0> <span class=md-ellipsis> Data Volume </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_3_label aria-expanded=false> <label class=md-nav__title for=__nav_3> <span class="md-nav__icon md-icon"></span> Data Volume </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../datavolume/datavolume.html.html class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../datavolume/How-to-attach-a-volume-to-VM-less-than-2TB-on-Linux-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to attach a volume to VM less than 2TB on Linux on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../datavolume/How-to-attach-a-volume-to-VM-more-than-2TB-on-Linux-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to attach a volume to VM more than 2TB on Linux on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../datavolume/Ephemeral-vs-Persistent-storage-option-Create-New-Volume-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Ephemeral vs Persistent storage option Create New Volume on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../datavolume/How-to-export-a-volume-over-NFS-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to export a volume over NFS on 3Engines Cloud </span> </a> </li> <li 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3Engines Cloud </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4 id=__nav_4_label tabindex=0> <span class=md-ellipsis> Networking </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_4_label aria-expanded=false> <label class=md-nav__title for=__nav_4> <span class="md-nav__icon md-icon"></span> Networking </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../networking/networking.html.html class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../networking/How-can-I-access-my-VMs-using-names-instead-of-IP-addresses-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How can I access my VMs using names instead of IP addresses on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> 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class=md-nav__item> <a href=../s3/How-to-access-object-storage-from-3Engines-Cloud-using-s3cmd.html.html class=md-nav__link> <span class=md-ellipsis> How to access object storage from 3Engines Cloud using s3cmd </span> </a> </li> <li class=md-nav__item> <a href=../s3/Configuration-files-for-s3cmd-command-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Configuration files for s3cmd command on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=../s3/S3-bucket-object-versioning-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> S3 bucket object versioning on 3Engines Cloud </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type=checkbox id=__nav_6> <label class=md-nav__link for=__nav_6 id=__nav_6_label tabindex=0> <span class=md-ellipsis> Windows </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 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</nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=sidebar data-md-type=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="On this page"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> On this page </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#prerequisites class=md-nav__link> <span class=md-ellipsis> Prerequisites🔗 </span> </a> </li> <li class=md-nav__item> <a href=#define-provider-for-terraform class=md-nav__link> <span class=md-ellipsis> Define provider for Terraform🔗 </span> </a> </li> <li class=md-nav__item> <a href=#define-cluster-resource-in-terraform class=md-nav__link> <span class=md-ellipsis> Define cluster resource in Terraform🔗 </span> </a> </li> <li class=md-nav__item> <a href=#apply-the-configurations-and-create-the-cluster class=md-nav__link> <span class=md-ellipsis> Apply the configurations and create the cluster🔗 </span> </a> </li> <li class=md-nav__item> <a href=#what-to-do-next class=md-nav__link> <span class=md-ellipsis> What To Do Next🔗 </span> </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <h1 id=how-to-create-kubernetes-cluster-using-terraform-on-3engines-cloud>How to create Kubernetes cluster using Terraform on 3Engines Cloud<a href=#how-to-create-kubernetes-cluster-using-terraform-on-brand-name title="Permalink to this headline">🔗</a><a class=headerlink href=#how-to-create-kubernetes-cluster-using-terraform-on-3engines-cloud title="Permanent link">¶</a></h1> <p>In this article we demonstrate using <a href=https://www.terraform.io/ >Terraform</a> to deploy an OpenStack Magnum Kubernetes cluster on 3Engines Cloud cloud.</p> <h2 id=prerequisites>Prerequisites<a href=#prerequisites title="Permalink to this headline">🔗</a><a class=headerlink href=#prerequisites title="Permanent link">¶</a></h2> <p>No. 1 <strong>Hosting account</strong></p> <p>You need an active 3Engines Cloud account <a href=https://portal.3Engines.com/ >https://portal.3Engines.com/</a>.</p> <p>No. 2 <strong>Active CLI session with OpenStackClient for Linux</strong></p> <p>You need an OpenStack CLI installed and the respective Python virtual environment sourced. For guidelines see:</p> <p><a href=../openstackcli/How-to-install-OpenStackClient-for-Linux-on-3Engines-Cloud.html.html>How to install OpenStackClient for Linux on 3Engines Cloud</a></p> <p>It will show you how to install Python, create and activate a virtual environment, and then connect to the cloud by downloading and activating the proper RC file from the 3Engines Cloud cloud.</p> <p>No. 3 <strong>Connect to the cloud via an RC file</strong></p> <p>Another article, <a href=../accountmanagement/How-to-activate-OpenStack-CLI-access-to-3Engines-Cloud-cloud-using-one-or-two-factor-authentication.html.html>How to activate OpenStack CLI access to 3Engines Cloud cloud using one- or two-factor authentication</a>, deals with connecting to the cloud and is covering either of the one- or two-factor authentication procedures that are enabled on your account. It also covers all the main platforms: Linux, MacOS and Windows.</p> <p>You will use both the Python virtual environment and the downloaded RC file <strong>after</strong> Terraform has been installed.</p> <p>No. 4 <strong>Familiarity with creating Kubernetes clusters</strong></p> <p>Familiarity with creating Kubernetes clusters in a standard way e.g. using Horizon or OpenStack CLI:</p> <p><a href=How-to-Create-a-Kubernetes-Cluster-Using-3Engines-Cloud-OpenStack-Magnum.html.html>How to Create a Kubernetes Cluster Using 3Engines Cloud OpenStack Magnum</a></p> <p><a href=How-To-Use-Command-Line-Interface-for-Kubernetes-Clusters-On-3Engines-Cloud-OpenStack-Magnum.html.html>How To Use Command Line Interface for Kubernetes Clusters On 3Engines Cloud OpenStack Magnum</a></p> <p>No. 5 <strong>Terraform operational</strong></p> <p>Have Terraform installed locally or on a cloud VM - installation guidelines along with further information can be found in this article:</p> <p><a href=../openstackdev/Generating-and-authorizing-Terraform-using-Keycloak-user-on-3Engines-Cloud.html.html>Generating and authorizing Terraform using Keycloak user on 3Engines Cloud</a></p> <p>After you finish working through that article, you will have access to the cloud via an active <strong>openstack</strong> command. Also, special environmental (<strong>env</strong>) variables (<strong>OS_USERNAME</strong>, <strong>OS_PASSWORD</strong>, <strong>OS_AUTH_URL</strong> and others) will be set up so that various programs can use them – Terraform being the prime target here.</p> <h2 id=define-provider-for-terraform>Define provider for Terraform<a href=#define-provider-for-terraform title="Permalink to this headline">🔗</a><a class=headerlink href=#define-provider-for-terraform title="Permanent link">¶</a></h2> <p>Terraform uses the notion of <em>provider</em>, which represents your concrete cloud environment and covers authentication. 3Engines Cloud clouds are built complying with OpenStack technology and OpenStack is one of the standard types of providers for Terraform.</p> <p>We need to:</p> <blockquote> <ul> <li>instruct Terraform to use OpenStack as a provider type</li> <li>provide credentials which will to point to our own project and user in the cloud.</li> </ul> </blockquote> <p>Assuming you have worked through Prerequisite No. 2 (download and source the RC file), several OpenStack-related environment variables will be populated in your local system. The ones pointing to your OpenStack environment start with OS, e.g. <strong>OS_USERNAME</strong>, <strong>OS_PASSWORD</strong>, <strong>OS_AUTH_URL</strong>. When we define OpenStack as TerraForm provider type, Terraform will know to automatically use these <strong>env</strong> variables to authenticate.</p> <p>Let’s define the Terraform provider now by creating file <strong>provider.tf</strong> with the following contents:</p> <blockquote> <p><strong>provider.tf</strong></p> </blockquote> <div class=highlight><pre><span></span><code><span id=__span-0-1><a id=__codelineno-0-1 name=__codelineno-0-1 href=#__codelineno-0-1></a># Define providers
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</span><span id=__span-0-2><a id=__codelineno-0-2 name=__codelineno-0-2 href=#__codelineno-0-2></a>terraform {
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</span><span id=__span-0-3><a id=__codelineno-0-3 name=__codelineno-0-3 href=#__codelineno-0-3></a>required_version = ">= 0.14.0"
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</span><span id=__span-0-4><a id=__codelineno-0-4 name=__codelineno-0-4 href=#__codelineno-0-4></a> required_providers {
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</span><span id=__span-0-5><a id=__codelineno-0-5 name=__codelineno-0-5 href=#__codelineno-0-5></a> openstack = {
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</span><span id=__span-0-6><a id=__codelineno-0-6 name=__codelineno-0-6 href=#__codelineno-0-6></a> source = "terraform-provider-openstack/openstack"
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</span><span id=__span-0-7><a id=__codelineno-0-7 name=__codelineno-0-7 href=#__codelineno-0-7></a> version = "~> 1.35.0"
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</span><span id=__span-0-8><a id=__codelineno-0-8 name=__codelineno-0-8 href=#__codelineno-0-8></a> }
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</span><span id=__span-0-9><a id=__codelineno-0-9 name=__codelineno-0-9 href=#__codelineno-0-9></a> }
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</span><span id=__span-0-10><a id=__codelineno-0-10 name=__codelineno-0-10 href=#__codelineno-0-10></a>}
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</span><span id=__span-0-11><a id=__codelineno-0-11 name=__codelineno-0-11 href=#__codelineno-0-11></a>
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</span><span id=__span-0-12><a id=__codelineno-0-12 name=__codelineno-0-12 href=#__codelineno-0-12></a># Configure the OpenStack Provider
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</span><span id=__span-0-13><a id=__codelineno-0-13 name=__codelineno-0-13 href=#__codelineno-0-13></a>provider "openstack" {
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</span><span id=__span-0-14><a id=__codelineno-0-14 name=__codelineno-0-14 href=#__codelineno-0-14></a> auth_url = "https://keystone.3Engines.com:5000/v3"
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</span><span id=__span-0-15><a id=__codelineno-0-15 name=__codelineno-0-15 href=#__codelineno-0-15></a> # the rest of configuration parameters are taken from environment variables once RC file is correctly sourced
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</span><span id=__span-0-16><a id=__codelineno-0-16 name=__codelineno-0-16 href=#__codelineno-0-16></a>}
|
||
</span></code></pre></div> <p>The <strong>auth_url</strong> is the only configuration option that shall be provided in the configuration file, despite it also being available within the environment variables.</p> <p>Having this provider spec allows us to create a cluster in the following steps, but can also be reused to create other resources in your OpenStack environment e.g. virtual machines, volumes and many others.</p> <h2 id=define-cluster-resource-in-terraform>Define cluster resource in Terraform<a href=#define-cluster-resource-in-terraform title="Permalink to this headline">🔗</a><a class=headerlink href=#define-cluster-resource-in-terraform title="Permanent link">¶</a></h2> <p>The second step is to define the exact specification of a resource that we want to create with Terraform. In our case we want to create a OpenStack Magnum cluster. In Terraform terminology, it will be an instance of <strong>openstack_containerinfra_cluster_v1</strong> resource type. To proceed, create file <strong>cluster.tf</strong> which contains the specification of our cluster:</p> <p><strong>cluster.tf</strong></p> <div class=highlight><pre><span></span><code><span id=__span-1-1><a id=__codelineno-1-1 name=__codelineno-1-1 href=#__codelineno-1-1></a># Create resource
|
||
</span><span id=__span-1-2><a id=__codelineno-1-2 name=__codelineno-1-2 href=#__codelineno-1-2></a>resource "openstack_containerinfra_cluster_v1" "k8s-cluster" {
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||
</span><span id=__span-1-3><a id=__codelineno-1-3 name=__codelineno-1-3 href=#__codelineno-1-3></a> name = "k8s-cluster"
|
||
</span><span id=__span-1-4><a id=__codelineno-1-4 name=__codelineno-1-4 href=#__codelineno-1-4></a> cluster_template_id = "524535ed-9a0f-4b70-966f-6830cdc52604"
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||
</span><span id=__span-1-5><a id=__codelineno-1-5 name=__codelineno-1-5 href=#__codelineno-1-5></a> node_count = 3
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</span><span id=__span-1-6><a id=__codelineno-1-6 name=__codelineno-1-6 href=#__codelineno-1-6></a> master_count = 3
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||
</span><span id=__span-1-7><a id=__codelineno-1-7 name=__codelineno-1-7 href=#__codelineno-1-7></a> flavor = "eo1.large"
|
||
</span><span id=__span-1-8><a id=__codelineno-1-8 name=__codelineno-1-8 href=#__codelineno-1-8></a> master_flavor = "hmad.medium"
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||
</span><span id=__span-1-9><a id=__codelineno-1-9 name=__codelineno-1-9 href=#__codelineno-1-9></a> keypair = "mykeypair"
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||
</span><span id=__span-1-10><a id=__codelineno-1-10 name=__codelineno-1-10 href=#__codelineno-1-10></a> labels = {
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||
</span><span id=__span-1-11><a id=__codelineno-1-11 name=__codelineno-1-11 href=#__codelineno-1-11></a> eodata_access_enabled = true
|
||
</span><span id=__span-1-12><a id=__codelineno-1-12 name=__codelineno-1-12 href=#__codelineno-1-12></a> etcd_volume_size = 0
|
||
</span><span id=__span-1-13><a id=__codelineno-1-13 name=__codelineno-1-13 href=#__codelineno-1-13></a> }
|
||
</span><span id=__span-1-14><a id=__codelineno-1-14 name=__codelineno-1-14 href=#__codelineno-1-14></a> merge_labels = true
|
||
</span><span id=__span-1-15><a id=__codelineno-1-15 name=__codelineno-1-15 href=#__codelineno-1-15></a>}
|
||
</span></code></pre></div> <p>The above setup reflects a cluster with some frequently used customizations:</p> <dl> <dt>cluster_template_id</dt> <dd>corresponds to the ID of one of default cluster templates in WAW3-2 cloud, which is <strong>k8s-localstorage-1.23.16-v1.0.0</strong>. The default templates and their IDs can be looked up in Horizon UI interface in the submenu <strong>Cluster Infra</strong> -→ <strong>Container Templates</strong>.</dd> <dt>node_count, node_flavor, master_node_count, master_node_flavor</dt> <dd>correspond intuitively to <strong>count</strong> and <strong>flavor</strong> of master and worker nodes in the cluster.</dd> <dt>keypair</dt> <dd>reflects the name of keypair used in our openstack project in the chosen cloud</dd> <dt>labels and merge_labels</dt> <dd> <p>We use two labels:</p> <dl> <dt>eodata_access_enabled=true</dt> <dd>ensures that EODATA network with fast access to satellite images is connected to our cluster nodes,</dd> <dt>etcd_volume_size=0</dt> <dd>which ensures that master nodes are properly provisioned with NVME local storage.</dd> </dl> <p>With this configuration, it is mandatory to also use configuration <strong>merge_labels=true</strong> to properly apply these labels and avoid overwriting them by template defaults.</p> </dd> </dl> <p>In our example we operate on WAW3-2 cloud, where flavor <strong>hmad.medium</strong> is available. If using another cloud, adjust the parameters accordingly.</p> <p>The above configuration reflects a cluster where <em>loadbalancer</em> is placed in front of the master nodes, and where this loadbalancer’s flavor is <strong>HA-large</strong>. Customizing this default, similarly as with other more advanced defaults, would require creating a custom Magnum template, which is beyond the scope of this article.</p> <h2 id=apply-the-configurations-and-create-the-cluster>Apply the configurations and create the cluster<a href=#apply-the-configurations-and-create-the-cluster title="Permalink to this headline">🔗</a><a class=headerlink href=#apply-the-configurations-and-create-the-cluster title="Permanent link">¶</a></h2> <p>Once both Terraform configurations described in previous steps are defined, we can apply them to create our cluster.</p> <p>The first step is to have both files <strong>provider.tf</strong> and <strong>cluster.tf</strong> available in a dedicated folder. Then <strong>cd</strong> to this folder and type:</p> <div class=highlight><pre><span></span><code><span id=__span-2-1><a id=__codelineno-2-1 name=__codelineno-2-1 href=#__codelineno-2-1></a>terraform init
|
||
</span></code></pre></div> <p>This command will initialize our cluster deployment. It will capture any formal errors with authentication to OpenStack, which might need correcting before moving to the next stage.</p> <p><a class=glightbox href=../_images/image-2024-6-17_15-52-40.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-6-17_15-52-40.png src=../_images/image-2024-6-17_15-52-40.png></a></p> <p>As the next step, Terraform will plan the actions it needs to perform to create the resource. Proceed with typing:</p> <div class=highlight><pre><span></span><code><span id=__span-3-1><a id=__codelineno-3-1 name=__codelineno-3-1 href=#__codelineno-3-1></a>terraform plan
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||
</span></code></pre></div> <p>The result is shown below and gives a chance to correct any logical errors to our expected setup:</p> <p><a class=glightbox href=../_images/image-2024-6-18_17-32-8.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-6-18_17-32-8.png src=../_images/image-2024-6-18_17-32-8.png></a></p> <p>The last step is to apply the planned changes. Perform this step with the command:</p> <div class=highlight><pre><span></span><code><span id=__span-4-1><a id=__codelineno-4-1 name=__codelineno-4-1 href=#__codelineno-4-1></a>terraform apply
|
||
</span></code></pre></div> <p>The output of this last command will initially repeat the plan, then ask to enter word <strong>yes</strong> to set the Terraform into action.</p> <p>Upon confirming with <strong>yes</strong>, the action is deployed and the console will update every 10 seconds to give a “Still creating …” check until our cluster is created.</p> <p>The final lines of the output after successfully provisioning the cluster, should read similar to the below:</p> <p><a class=glightbox href=../_images/image-2024-6-18_18-1-53.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=image-2024-6-18_18-1-53.png src=../_images/image-2024-6-18_18-1-53.png></a></p> <h2 id=what-to-do-next>What To Do Next<a href=#what-to-do-next title="Permalink to this headline">🔗</a><a class=headerlink href=#what-to-do-next title="Permanent link">¶</a></h2> <p>Terraform can be used also to deploy additional applications to our cluster e.g. using Helm provider for Terraform. Check Terraform documentation for more details.</p> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> </div> </div> </footer> </div> <div class=md-dialog data-md-component=dialog> <div class="md-dialog__inner md-typeset"></div> </div> <script id=__config type=application/json>{"base": "..", "features": ["content.code.annotate", "content.code.copy", "content.tooltips", "navigation.tabs", "navigation.sections", "navigation.footer", "navigation.indexes", "navigation.sections", "navigation.top", "navigation.tracking", "search.highlight", "search.share", "search.suggest", "toc.follow"], "search": "../assets/javascripts/workers/search.d50fe291.min.js", "tags": null, "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}, "version": null}</script> <script src=../assets/javascripts/bundle.13a4f30d.min.js></script> <script id="init-glightbox">const lightbox = GLightbox({"touchNavigation": false, "loop": false, "zoomable": true, "draggable": true, "openEffect": "zoom", "closeEffect": "zoom", "slideEffect": "slide"});
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