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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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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 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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=#what-we-are-going-to-cover class=md-nav__link> <span class=md-ellipsis> What We Are Going To Cover🔗 </span> </a> </li> <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=#the-advantages-of-using-the-cli class=md-nav__link> <span class=md-ellipsis> The Advantages of Using the CLI🔗 </span> </a> <nav class=md-nav aria-label="The Advantages of Using the CLI🔗"> <ul class=md-nav__list> <li class=md-nav__item> <a href=#reproduce-commands-through-cut-paste class=md-nav__link> <span class=md-ellipsis> Reproduce Commands Through Cut & Paste🔗 </span> </a> </li> <li class=md-nav__item> <a href=#cli-commands-can-be-automated class=md-nav__link> <span class=md-ellipsis> CLI Commands Can Be Automated🔗 </span> </a> </li> <li class=md-nav__item> <a href=#cli-yields-access-to-all-of-the-existing-openstack-and-magnum-parameters class=md-nav__link> <span class=md-ellipsis> CLI Yields Access to All of the Existing OpenStack and Magnum Parameters🔗 </span> </a> </li> <li class=md-nav__item> <a href=#debugging-openstack-and-magnum-commands class=md-nav__link> <span class=md-ellipsis> Debugging OpenStack and Magnum Commands🔗 </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#how-to-enter-openstack-commands class=md-nav__link> <span class=md-ellipsis> How to Enter OpenStack Commands🔗 </span> </a> </li> <li class=md-nav__item> <a href=#openstack-command-for-creation-of-cluster class=md-nav__link> <span class=md-ellipsis> OpenStack Command for Creation of Cluster🔗 </span> </a> </li> <li class=md-nav__item> <a href=#how-to-check-upon-the-status-of-the-cluster class=md-nav__link> <span class=md-ellipsis> How To Check Upon the Status of the Cluster🔗 </span> </a> </li> <li class=md-nav__item> <a href=#failure-to-create-a-cluster class=md-nav__link> <span class=md-ellipsis> Failure to Create a Cluster🔗 </span> </a> </li> <li class=md-nav__item> <a href=#cli-commands-to-delete-a-cluster class=md-nav__link> <span class=md-ellipsis> CLI Commands to Delete a 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-use-command-line-interface-for-kubernetes-clusters-on-3engines-cloud-openstack-magnum>How To Use Command Line Interface for Kubernetes Clusters On 3Engines Cloud OpenStack Magnum<a href=#how-to-use-command-line-interface-for-kubernetes-clusters-on-brand-name-openstack-magnum title="Permalink to this headline">🔗</a><a class=headerlink href=#how-to-use-command-line-interface-for-kubernetes-clusters-on-3engines-cloud-openstack-magnum title="Permanent link">¶</a></h1> <p>In this article you shall use Command Line Interface (CLI) to speed up testing and creation of Kubernetes clusters on OpenStack Magnum servers.</p> <h2 id=what-we-are-going-to-cover>What We Are Going To Cover<a href=#what-we-are-going-to-cover title="Permalink to this headline">🔗</a><a class=headerlink href=#what-we-are-going-to-cover title="Permanent link">¶</a></h2> <blockquote> <ul> <li>The advantages of using CLI over the Horizon graphical interface</li> <li>Debugging OpenStack and Magnum commands</li> <li>How to create a new Kubernetes cluster template using CLI</li> <li>How to create a new Kubernetes cluster using CLI</li> <li>Reasons why the cluster may fail to create</li> <li>CLI commands to delete a cluster</li> </ul> </blockquote> <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</strong></p> <p>You need a 3Engines Cloud hosting account with Horizon interface <a href=https://horizon.3Engines.com>https://horizon.3Engines.com</a>.</p> <p>No. 2 <strong>Private and public keys</strong></p> <p>An SSH key-pair created in OpenStack dashboard. To create it, follow this article <a href=../cloud/How-to-create-key-pair-in-OpenStack-Dashboard-on-3Engines-Cloud.html.html>How to create key pair in OpenStack Dashboard on 3Engines Cloud</a>. You will have created keypair called <em>sshkey</em> and you will be able to use it for this tutorial as well.</p> <p>No. 3 <strong>Command Structure of OpenStack Client Commands</strong></p> <p>Here is the manual for OpenStackClient commands: <a href=https://docs.openstack.org/python-openstackclient/xena/cli/commands.html.md>Command Structure Xena version</a>.</p> <p>No. 4 <strong>Command List of OpenStack Client Commands</strong></p> <p>These are all the commands supported by Xena release of OpenStackClient: <a href=https://docs.openstack.org/python-openstackclient/xena/cli/command-list.html.md>Xena Command List</a>.</p> <p>No. 5 <strong>Documentation for Magnum client</strong></p> <p>These are all the commands supported by Xena release of MagnumClient: <a href=https://docs.openstack.org/magnum/latest/user/ >Magnum User Guide</a>.</p> <p>No. 6 <strong>How to install OpenStack and Magnum Clients</strong></p> <p>The step that directly precedes this article is: <a href=How-To-Install-OpenStack-and-Magnum-Clients-for-Command-Line-Interface-to-3Engines-Cloud-Horizon.html.html>How To Install OpenStack and Magnum Clients for Command Line Interface to 3Engines Cloud Horizon</a>.</p> <p>In that guide, you have installed the CLI and in this tutorial, you are going to use it to work with Kubernetes on OpenStack Magnum.</p> <p>No. 7 <strong>Autohealing of Kubernetes Clusters</strong></p> <p>To learn more about autohealing of Kubernetes clusters, follow this official article <a href=https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/magnum-auto-healer/using-magnum-auto-healer.md>What is Magnum Autohealer?</a>.</p> <h2 id=the-advantages-of-using-the-cli>The Advantages of Using the CLI<a href=#the-advantages-of-using-the-cli title="Permalink to this headline">🔗</a><a class=headerlink href=#the-advantages-of-using-the-cli title="Permanent link">¶</a></h2> <p>You can use the CLI and Horizon interface interchangeably, but there are at least three advantages in using CLI.</p> <h3 id=reproduce-commands-through-cut-paste>Reproduce Commands Through Cut & Paste<a href=#reproduce-commands-through-cut-paste title="Permalink to this headline">🔗</a><a class=headerlink href=#reproduce-commands-through-cut-paste title="Permanent link">¶</a></h3> <p>Here is a command to list flavors in the system</p> <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>openstack flavor list
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</span></code></pre></div> <p><a class=glightbox href=../_images/flavors_list.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=flavors_list.png src=../_images/flavors_list.png></a></p> <p>If you have this line stored in text editor app, you can reproduce it at will. In contrast, to get the list of flavors using Horizon, you would have to click on a series of screen buttons</p> <blockquote> <p><strong>Compute</strong> => <strong>Instances</strong> => <strong>Launch instance</strong> => <strong>Flavor</strong></p> </blockquote> <p>and only then get the list of flavors to choose from:</p> <p><a class=glightbox href=../_images/horizon_flavors.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=horizon_flavors.png src=../_images/horizon_flavors.png></a></p> <p>A bonus is that keeping commands in a text editor automatically creates documentation for the server and cluster.</p> <h3 id=cli-commands-can-be-automated>CLI Commands Can Be Automated<a href=#cli-commands-can-be-automated title="Permalink to this headline">🔗</a><a class=headerlink href=#cli-commands-can-be-automated title="Permanent link">¶</a></h3> <p>You can use available automation. The result of the following Ubuntu pipeline is the url for communication from <strong>kubectl</strong> to the Kubernetes cluster:</p> <p><a class=glightbox href=../_images/kubernetes_url.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=kubernetes_url.png src=../_images/kubernetes_url.png></a></p> <p>There are two commands pipelined into one:</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>KUBERNETES_URL=$(openstack coe cluster show k8s-cluster
|
||
</span><span id=__span-1-2><a id=__codelineno-1-2 name=__codelineno-1-2 href=#__codelineno-1-2></a> | awk '/ api_address /{print $4}')
|
||
</span></code></pre></div> <p>The result of the first command</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>openstack coe cluster show k8s-cluster
|
||
</span></code></pre></div> <p>is a series of lines starting with the name of the parameter and followed by the actual value.</p> <p><a class=glightbox href=../_images/api_address.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=api_address.png src=../_images/api_address.png></a></p> <p>The second statement, to the right of the pipelining symbol <strong>|</strong></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>awk '/ api_address /{print $4}')
|
||
</span></code></pre></div> <p>is searching for the line starting with <em>api_address</em> and extracting its value <em>https://64.225.132.135:6443</em>. The final result is exported to the system variable KUBERNETES_URL, thus automatically setting it up for use by Kubernetes cluster command <strong>kubectl</strong> when accessing the cloud.</p> <h3 id=cli-yields-access-to-all-of-the-existing-openstack-and-magnum-parameters>CLI Yields Access to All of the Existing OpenStack and Magnum Parameters<a href=#cli-yields-access-to-all-of-the-existing-openstack-and-magnum-parameters title="Permalink to this headline">🔗</a><a class=headerlink href=#cli-yields-access-to-all-of-the-existing-openstack-and-magnum-parameters title="Permanent link">¶</a></h3> <p>CLI commands offer access to a larger set of parameters than is available through Horizon. For instance, in Horizon, the default length of time allowed for creation of a cluster is 60 minutes while in CLI, you can set it to other values of choice.</p> <h3 id=debugging-openstack-and-magnum-commands>Debugging OpenStack and Magnum Commands<a href=#debugging-openstack-and-magnum-commands title="Permalink to this headline">🔗</a><a class=headerlink href=#debugging-openstack-and-magnum-commands title="Permanent link">¶</a></h3> <p>To see what is actually happening behind the scenes, when executing client commands, add parameter <strong>–debug</strong>:</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>openstack coe cluster list --debug
|
||
</span></code></pre></div> <p>The output will be several screens long, consisting of GET and POST web calls, with dozens of parameters shown on screen. (The output is too voluminous to reproduce here.)</p> <h2 id=how-to-enter-openstack-commands>How to Enter OpenStack Commands<a href=#how-to-enter-openstack-commands title="Permalink to this headline">🔗</a><a class=headerlink href=#how-to-enter-openstack-commands title="Permanent link">¶</a></h2> <p>Note</p> <p>In the forthcoming example, a version <strong>fedora-coreos-34.20210904.3.0</strong> of fedora images is used. As the system is updated in time, the actual values may become different, for instance, any of values <strong>fedora-coreos-35</strong> or <strong>fedora-coreos-33.20210426.3.0</strong>. Use Horizon command Compute -> Images to see what images of fedora are currently available, then edit and replace as needed.</p> <p>There are several ways to write down and enter Openstack commands into the terminal command line interface.</p> <p>One way is to enter command <strong>openstack</strong> and press <em>Enter</em> on the keyboard. You enter the line mode of the <strong>openstack</strong> command and can enter rows of various openstack parameters line after line. This is stricly for manual data entry and is difficult to automate.</p> <p><a class=glightbox href=../_images/ku_openstack_line_entry.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_openstack_line_entry.png src=../_images/ku_openstack_line_entry.png></a></p> <p>Type <strong>quit</strong> and press <em>Enter</em> on keyboard to leave that mode.</p> <p>The usual way of entering <strong>openstack</strong> parameters is in one long line. Leave spaces between parameters but enter label values <em>without</em> any spaces inbetween. An example may be:</p> <p><a class=glightbox href=../_images/ku_long_line.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_long_line.png src=../_images/ku_long_line.png></a></p> <p>The line breaks and blanks have to be eradicated manually in this case.</p> <p>A more elegant way is to use backslash character, *<em>*</em>, in line text. The character after backslash will not be taken into account so if you enter it at the very end of the line, the EOL character will be avoided and the first and the second line will be treated as one continuous line. That is exactly what you want, so here is what an entry line could look like with this approach:</p> <div class=highlight><pre><span></span><code><span id=__span-5-1><a id=__codelineno-5-1 name=__codelineno-5-1 href=#__codelineno-5-1></a>openstack coe cluster template create kubecluster \
|
||
</span><span id=__span-5-2><a id=__codelineno-5-2 name=__codelineno-5-2 href=#__codelineno-5-2></a>--image "fedora-coreos-34.20210904.3.0" \
|
||
</span><span id=__span-5-3><a id=__codelineno-5-3 name=__codelineno-5-3 href=#__codelineno-5-3></a>--external-network external \
|
||
</span><span id=__span-5-4><a id=__codelineno-5-4 name=__codelineno-5-4 href=#__codelineno-5-4></a>--master-flavor eo1.large \
|
||
</span><span id=__span-5-5><a id=__codelineno-5-5 name=__codelineno-5-5 href=#__codelineno-5-5></a>--flavor eo1.large \
|
||
</span><span id=__span-5-6><a id=__codelineno-5-6 name=__codelineno-5-6 href=#__codelineno-5-6></a>--docker-volume-size 50 \
|
||
</span><span id=__span-5-7><a id=__codelineno-5-7 name=__codelineno-5-7 href=#__codelineno-5-7></a>--network-driver calico \
|
||
</span><span id=__span-5-8><a id=__codelineno-5-8 name=__codelineno-5-8 href=#__codelineno-5-8></a>--docker-storage-driver overlay2 \
|
||
</span><span id=__span-5-9><a id=__codelineno-5-9 name=__codelineno-5-9 href=#__codelineno-5-9></a>--master-lb-enabled \
|
||
</span><span id=__span-5-10><a id=__codelineno-5-10 name=__codelineno-5-10 href=#__codelineno-5-10></a>--volume-driver cinder \
|
||
</span><span id=__span-5-11><a id=__codelineno-5-11 name=__codelineno-5-11 href=#__codelineno-5-11></a>--labels boot_volume_type=,boot_volume_size=50,kube_tag=v1.18.2,availability_zone=nova \
|
||
</span><span id=__span-5-12><a id=__codelineno-5-12 name=__codelineno-5-12 href=#__codelineno-5-12></a>--coe kubernetes -f value -c uuid
|
||
</span></code></pre></div> <p>The end of each line is precented by a backslash and so all these lines appear as one (long) line to terminal command line scanner. However, when copying and pasting this to the terminal line, beware of the following situation:</p> <p><a class=glightbox href=../_images/ku_blanks.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_blanks.png src=../_images/ku_blanks.png></a></p> <p>If the blanks are present at the beginning of each line, that will be a problem. Eliminate them by going into any text editor and then removing them either manually or through replace function. What you need to have in text editor is this:</p> <p><a class=glightbox href=../_images/ku_no_blanks.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_no_blanks.png src=../_images/ku_no_blanks.png></a></p> <p>Now you can copy it and paste into the terminal command line:</p> <p><a class=glightbox href=../_images/ku_blanks_ok.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_blanks_ok.png src=../_images/ku_blanks_ok.png></a></p> <p>You notice that the line with <strong>labels</strong> can become long and its right part may not be visible on screen. Use <strong>** and new line to break the long </strong>–labels** line into several shorter ones:</p> <p><a class=glightbox href=../_images/ku_labels_broken.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=ku_labels_broken.png src=../_images/ku_labels_broken.png></a></p> <p>Pressing <em>Enter</em> on the keyboard activates this entire command and it is accepted by the system as you can see in the line below the command.</p> <p>Warning</p> <p>If you are new to Kubernetes please, at first, create clusters only directly using the default cluster template. Once you get more experience, you can start creating your own cluster templates and here is how to do it using CLI.</p> <h2 id=openstack-command-for-creation-of-cluster>OpenStack Command for Creation of Cluster<a href=#openstack-command-for-creation-of-cluster title="Permalink to this headline">🔗</a><a class=headerlink href=#openstack-command-for-creation-of-cluster title="Permanent link">¶</a></h2> <p>In this step you can create a new cluster using either the default cluster template or any of the templates that you have already created.</p> <p>Enter</p> <div class=highlight><pre><span></span><code><span id=__span-6-1><a id=__codelineno-6-1 name=__codelineno-6-1 href=#__codelineno-6-1></a>openstack coe cluster create -h
|
||
</span></code></pre></div> <p>to see the parameters. Provide all or almost all of the required parameters.</p> <div class=highlight><pre><span></span><code><span id=__span-7-1><a id=__codelineno-7-1 name=__codelineno-7-1 href=#__codelineno-7-1></a>usage: openstack coe cluster create
|
||
</span><span id=__span-7-2><a id=__codelineno-7-2 name=__codelineno-7-2 href=#__codelineno-7-2></a>[-h]
|
||
</span><span id=__span-7-3><a id=__codelineno-7-3 name=__codelineno-7-3 href=#__codelineno-7-3></a>--cluster-template <cluster-template>
|
||
</span><span id=__span-7-4><a id=__codelineno-7-4 name=__codelineno-7-4 href=#__codelineno-7-4></a>[--discovery-url <discovery-url>]
|
||
</span><span id=__span-7-5><a id=__codelineno-7-5 name=__codelineno-7-5 href=#__codelineno-7-5></a>[--docker-volume-size <docker-volume-size>]
|
||
</span><span id=__span-7-6><a id=__codelineno-7-6 name=__codelineno-7-6 href=#__codelineno-7-6></a>[--labels <KEY1=VALUE1,KEY2=VALUE2;KEY3=VALUE3...>]
|
||
</span><span id=__span-7-7><a id=__codelineno-7-7 name=__codelineno-7-7 href=#__codelineno-7-7></a>[--keypair <keypair>]
|
||
</span><span id=__span-7-8><a id=__codelineno-7-8 name=__codelineno-7-8 href=#__codelineno-7-8></a>[--master-count <master-count>]
|
||
</span><span id=__span-7-9><a id=__codelineno-7-9 name=__codelineno-7-9 href=#__codelineno-7-9></a>[--node-count <node-count>]
|
||
</span><span id=__span-7-10><a id=__codelineno-7-10 name=__codelineno-7-10 href=#__codelineno-7-10></a>[--timeout <timeout>]
|
||
</span><span id=__span-7-11><a id=__codelineno-7-11 name=__codelineno-7-11 href=#__codelineno-7-11></a>[--master-flavor <master-flavor>]
|
||
</span><span id=__span-7-12><a id=__codelineno-7-12 name=__codelineno-7-12 href=#__codelineno-7-12></a>[--flavor <flavor>]
|
||
</span><span id=__span-7-13><a id=__codelineno-7-13 name=__codelineno-7-13 href=#__codelineno-7-13></a><name>
|
||
</span></code></pre></div> <p>Here is what one such command might actually look like:</p> <div class=highlight><pre><span></span><code><span id=__span-8-1><a id=__codelineno-8-1 name=__codelineno-8-1 href=#__codelineno-8-1></a>openstack coe cluster create
|
||
</span><span id=__span-8-2><a id=__codelineno-8-2 name=__codelineno-8-2 href=#__codelineno-8-2></a> --cluster-template k8s-stable-1.23.5
|
||
</span><span id=__span-8-3><a id=__codelineno-8-3 name=__codelineno-8-3 href=#__codelineno-8-3></a> --docker-volume-size 50
|
||
</span><span id=__span-8-4><a id=__codelineno-8-4 name=__codelineno-8-4 href=#__codelineno-8-4></a> --labels eodata_access_enabled=false,floating-ip-enabled=true,
|
||
</span><span id=__span-8-5><a id=__codelineno-8-5 name=__codelineno-8-5 href=#__codelineno-8-5></a> --merge-labels
|
||
</span><span id=__span-8-6><a id=__codelineno-8-6 name=__codelineno-8-6 href=#__codelineno-8-6></a> --keypair sshkey
|
||
</span><span id=__span-8-7><a id=__codelineno-8-7 name=__codelineno-8-7 href=#__codelineno-8-7></a> --master-count 3
|
||
</span><span id=__span-8-8><a id=__codelineno-8-8 name=__codelineno-8-8 href=#__codelineno-8-8></a> --node-count 2
|
||
</span><span id=__span-8-9><a id=__codelineno-8-9 name=__codelineno-8-9 href=#__codelineno-8-9></a> --timeout 190
|
||
</span><span id=__span-8-10><a id=__codelineno-8-10 name=__codelineno-8-10 href=#__codelineno-8-10></a> --master-flavor eo1.large
|
||
</span><span id=__span-8-11><a id=__codelineno-8-11 name=__codelineno-8-11 href=#__codelineno-8-11></a> --flavor eo1.large
|
||
</span><span id=__span-8-12><a id=__codelineno-8-12 name=__codelineno-8-12 href=#__codelineno-8-12></a> newcluster
|
||
</span></code></pre></div> <p>Warning</p> <p>When using the exemplar default cluster template, <em>k8s-stable-1.23.5</em>, there is no need to specify label <strong>master-lb-enabled=true</strong> as the master load balancer will always be created with the default cluster template. The only way to <strong>not</strong> have master load balancer created with the default template is to specify flag <strong>–master-lb-disabled</strong>. Again, using <strong>master-lb-enabled=false</strong> with <strong>–merge-labels</strong> applied afterwards, also will <strong>not</strong> work, i.e. will not prevent master LB from being created.</p> <p>Here are some special labels the functionality of which is only available through CLI and not through Horizon as well.</p> <p><strong>How to properly form a cluster with auto healing turned on</strong></p> <p>Note</p> <p><strong>Prerequisite No. 6</strong> will show you how to enable command line interface with your cloud server. <strong>Prerequisite No. 7</strong> will give you a formal introduction to the notion of Kubernetes autohealing, as implemented in OpenStack Magnum.</p> <p>The only way to have auto healing turned on and guarantee at the same time that the cluster will be formed normally, is to set up the following label:</p> <div class=highlight><pre><span></span><code><span id=__span-9-1><a id=__codelineno-9-1 name=__codelineno-9-1 href=#__codelineno-9-1></a>auto_healing_enabled=True
|
||
</span></code></pre></div> <p>Warning</p> <p>Do not include the above label if you want to create a cluster that does not use auto healing.</p> <p>Here is a variation of the CLI command to generate a cluster. It will use medium values instead of large for flavors, will have only one master and one worker node, will have auto healing turned on etc.</p> <p><strong>openstack coe cluster create –cluster-template k8s-stable-1.23.5 –labels floating-ip-enabled=true,master-lb-enabled=true,auto_healing_enabled=true –merge-labels –keypair sshkey –master-count 1 –node-count 1 –master-flavor eo1.medium –flavor eo1.medium newcluster</strong></p> <p><strong>Execute the command for creation of a cluster</strong></p> <p>Copy and paste the above command into the terminal where OpenStack and Magnum clients are active:</p> <p><a class=glightbox href=../_images/cli_newcluster.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=cli_newcluster.png src=../_images/cli_newcluster.png></a></p> <h2 id=how-to-check-upon-the-status-of-the-cluster>How To Check Upon the Status of the Cluster<a href=#how-to-check-upon-the-status-of-the-cluster title="Permalink to this headline">🔗</a><a class=headerlink href=#how-to-check-upon-the-status-of-the-cluster title="Permanent link">¶</a></h2> <p>The command to show the status of clusters is</p> <div class=highlight><pre><span></span><code><span id=__span-10-1><a id=__codelineno-10-1 name=__codelineno-10-1 href=#__codelineno-10-1></a>openstack coe cluster list
|
||
</span></code></pre></div> <p><em>newcluster</em> is in status of CREATE_IN_PROGRESS i.e. it is being created under the hood. Repeat the command after a minute or two and see the latest status, which now is CREATE_FAILED. To see the reason why the creation of the cluster stopped, go to the Horizon interface, list the clusters and click on the name of <em>newcluster</em>.</p> <p>Under <strong>Stack</strong>, there is a message like this:</p> <div class=highlight><pre><span></span><code><span id=__span-11-1><a id=__codelineno-11-1 name=__codelineno-11-1 href=#__codelineno-11-1></a>Resource CREATE failed: OverQuotaClient: resources.secgroup_kube_master: Quota exceeded for resources:
|
||
</span><span id=__span-11-2><a id=__codelineno-11-2 name=__codelineno-11-2 href=#__codelineno-11-2></a>['security_group_rule']. Neutron server returns request_ids: ['req-1aff5045-db64-4075-81df-80611db8cb6c']
|
||
</span></code></pre></div> <p>The quota for the security group rules was exceeded. To verify, execute this command:</p> <div class=highlight><pre><span></span><code><span id=__span-12-1><a id=__codelineno-12-1 name=__codelineno-12-1 href=#__codelineno-12-1></a>openstack quota show --default
|
||
</span></code></pre></div> <p>The result may be too cluttered in a normal terminal window, so in this case, more information will be available from the Horizon interface:</p> <p><a class=glightbox href=../_images/overview.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=overview.png src=../_images/overview.png></a></p> <p>Red and orange colors denote danger and you either have to ask support to double your quotas or delete the instances and clusters that have exceeded them.</p> <p>Note</p> <p>It is out of scope of this article to describe how to delete elements through Horizon interface. Make sure that quotas are available before new cluster creation.</p> <h2 id=failure-to-create-a-cluster>Failure to Create a Cluster<a href=#failure-to-create-a-cluster title="Permalink to this headline">🔗</a><a class=headerlink href=#failure-to-create-a-cluster title="Permanent link">¶</a></h2> <p>There are many reasons why a cluster may fail to create. Maybe the state of system quotas is not optimal, maybe there is a mismatch between the parameters of the cluster and the parameters in the rest of the cloud. For example, if you base the creation of cluster on the default cluster template, it will use Fedora distribution and require 10 GiB of memory. It may clash with <em>–docker-volume-size</em> if that was set up to be larger then 10 GiB.</p> <p>The flavors for master and minions are <em>eo1.large</em>, and if you want a larger Docker image size, increase the <em>–master-flavor</em> size.</p> <p>The entire cloud may be overloaded and the creation of cluster may take longer than the default 60 minutes. Set up the <em>–timeout</em> parameter to 120 or 180 minutes in such cases.</p> <p>If the creation process failed prematurely, then</p> <blockquote> <ul> <li>review system quotas</li> <li>delete the failed cluster(s)</li> <li>review system quotas again</li> <li>change parameters and</li> <li>run the cluster creation command again.</li> </ul> </blockquote> <h2 id=cli-commands-to-delete-a-cluster>CLI Commands to Delete a Cluster<a href=#cli-commands-to-delete-a-cluster title="Permalink to this headline">🔗</a><a class=headerlink href=#cli-commands-to-delete-a-cluster title="Permanent link">¶</a></h2> <p>If the cluster failed to create, it is still taking up system resources. Delete it with command such as</p> <div class=highlight><pre><span></span><code><span id=__span-13-1><a id=__codelineno-13-1 name=__codelineno-13-1 href=#__codelineno-13-1></a>openstack coe cluster delete
|
||
</span></code></pre></div> <p>List the clusters and you will first see that the status is DELETE_IN_PROGRESS and, after a while, the <em>newcluster</em> will disappear.</p> <p>Now try to delete cluster <em>largecluster</em>. There are two of them, so putting up a command such as</p> <div class=highlight><pre><span></span><code><span id=__span-14-1><a id=__codelineno-14-1 name=__codelineno-14-1 href=#__codelineno-14-1></a>openstack coe cluster delete largecluster
|
||
</span></code></pre></div> <p>will not be accepted. Instead of the name, enter the <em>uuid</em> value:</p> <div class=highlight><pre><span></span><code><span id=__span-15-1><a id=__codelineno-15-1 name=__codelineno-15-1 href=#__codelineno-15-1></a>openstack coe cluster delete e80c5815-d20b-4a2b-8588-49cf7a7e1aad
|
||
</span></code></pre></div> <p>Again, the request will be accepted and then after a minute or two, the required cluster will disappear.</p> <p>Now there is only one <em>largecluster</em> so this will work:</p> <div class=highlight><pre><span></span><code><span id=__span-16-1><a id=__codelineno-16-1 name=__codelineno-16-1 href=#__codelineno-16-1></a>openstack coe cluster delete largecluster
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</span></code></pre></div> <p>Deleting clusters that were not installed properly has freed up a significant amount of system resources. There are no more orange and red quotas:</p> <p><a class=glightbox href=../_images/after_delete_cluster.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=after_delete_cluster.png src=../_images/after_delete_cluster.png></a></p> <p>In this step you have successfuly deleted the clusters whose creation has stopped prematurely, thus paving the way to the creation of the next cluster under slightly different circumstances.</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>In this tutorial, you have used the CLI commands to generate cluster templates as well as clusters themselves. Also, if the cluster process failed, how to free up the system resources and try again.</p> <p>OpenStack and Magnum did heavy lifting for you, letting you create full fledged Kubernetes clusters with only a handful of CLI commands. The next step is to start working with the Kubernetes clusters directly. That means installing the <strong>kubectl</strong> command with article <a href=How-To-Access-Kubernetes-Cluster-Post-Deployment-Using-Kubectl-On-3Engines-Cloud-OpenStack-Magnum.html.html>How To Access Kubernetes Cluster Post Deployment Using Kubectl On 3Engines Cloud OpenStack Magnum</a> and using it to install the apps that you want to run on Kubernetes clusters.</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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