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</li> <li class=md-nav__item> <a href=How-to-use-Security-Groups-in-Horizon-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to use Security Groups in Horizon on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-create-key-pair-in-OpenStack-Dashboard-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create key pair in OpenStack Dashboard on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-create-new-Linux-VM-in-OpenStack-Dashboard-Horizon-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create new Linux VM in OpenStack Dashboard Horizon on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-install-Python-virtualenv-or-virtualenvwrapper-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to install Python virtualenv or virtualenvwrapper on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=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=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=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=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=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=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=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=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 href=How-to-create-a-Linux-VM-and-access-it-from-Linux-command-line-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create a Linux VM and access it from Linux command line on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=DNS-as-a-Service-on-3Engines-Cloud-Hosting.html.html class=md-nav__link> <span class=md-ellipsis> DNS as a Service on 3Engines Cloud Hosting </span> </a> </li> <li class=md-nav__item> <a href=What-Image-Formats-are-available-in-OpenStack-3Engines-Cloud-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> What Image Formats are Available in OpenStack 3Engines Cloud cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-upload-custom-image-to-3Engines-Cloud-cloud-using-OpenStack-Horizon-dashboard.html.html class=md-nav__link> <span class=md-ellipsis> How to upload custom image to 3Engines Cloud cloud using OpenStack Horizon dashboard </span> </a> </li> <li class=md-nav__item> <a href=How-to-create-Windows-VM-on-OpenStack-Horizon-and-access-it-via-web-console-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create Windows VM on OpenStack Horizon and access it via web console on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-transfer-volumes-between-domains-and-projects-using-Horizon-dashboard-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to transfer volumes between domains and projects using Horizon dashboard on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=Spot-instances-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> Spot instances on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=How-to-create-instance-snapshot-using-Horizon-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to create instance snapshot using Horizon on 3Engines Cloud </span> </a> </li> <li class=md-nav__item> <a href=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=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=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 md-nav__item--active"> <input class="md-nav__toggle md-toggle" type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> <span class=md-ellipsis> Resizing a virtual machine using OpenStack Horizon on 3Engines Cloud </span> <span class="md-nav__icon md-icon"></span> </label> <a href=Resizing-a-virtual-machine-using-OpenStack-Horizon-on-3Engines-Cloud.html.html class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Resizing a virtual machine using OpenStack Horizon on 3Engines Cloud </span> </a> <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=#introduction class=md-nav__link> <span class=md-ellipsis> Introduction🔗 </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=#creating-a-new-vm class=md-nav__link> <span class=md-ellipsis> Creating a new VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#steps-to-resize-the-vm class=md-nav__link> <span class=md-ellipsis> Steps to Resize the VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#advanced-options class=md-nav__link> <span class=md-ellipsis> Advanced Options🔗 </span> </a> </li> <li class=md-nav__item> <a href=#resize-the-vm class=md-nav__link> <span class=md-ellipsis> Resize the VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#troubleshooting class=md-nav__link> <span class=md-ellipsis> Troubleshooting🔗 </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> </li> <li class=md-nav__item> <a href=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> 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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 aria-labelledby=__nav_6_label aria-expanded=false> <label class=md-nav__title for=__nav_6> <span class="md-nav__icon md-icon"></span> Windows </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../windows/windows.html.html class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../windows/How-to-access-a-VM-from-Windows-PuTTY-on-3Engines-Cloud.html.html class=md-nav__link> <span class=md-ellipsis> How to access a 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<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=#creating-a-new-vm class=md-nav__link> <span class=md-ellipsis> Creating a new VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#steps-to-resize-the-vm class=md-nav__link> <span class=md-ellipsis> Steps to Resize the VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#advanced-options class=md-nav__link> <span class=md-ellipsis> Advanced Options🔗 </span> </a> </li> <li class=md-nav__item> <a href=#resize-the-vm class=md-nav__link> <span class=md-ellipsis> Resize the VM🔗 </span> </a> </li> <li class=md-nav__item> <a href=#troubleshooting class=md-nav__link> <span class=md-ellipsis> Troubleshooting🔗 </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=resizing-a-virtual-machine-using-openstack-horizon-on-3engines-cloud>Resizing a virtual machine using OpenStack Horizon on 3Engines Cloud<a href=#resizing-a-virtual-machine-using-openstack-horizon-on-brand-name title="Permalink to this headline">🔗</a><a class=headerlink href=#resizing-a-virtual-machine-using-openstack-horizon-on-3engines-cloud title="Permanent link">¶</a></h1> <h2 id=introduction>Introduction<a href=#introduction title="Permalink to this headline">🔗</a><a class=headerlink href=#introduction title="Permanent link">¶</a></h2> <p>When creating a new virtual machine under OpenStack, one of the options you choose is the <em>flavor</em>. A flavor is a predefined combination of CPU, memory and disk size and there usually is a number of such flavors for you to choose from.</p> <p>After the instance is spawned, it is possible to change one flavor for another, and that process is called <em>resizing</em>. You might want to resize an already existing VM in order to:</p> <blockquote> <ul> <li>increase (or decrease) the number of CPUs used,</li> <li>use more RAM to prevent crashes or enable swapping,</li> <li>add larger storage to avoid running out of disk space,</li> <li>seamlessly transition from testing to production environment,</li> <li>change application workload byt scaling the VM up or down.</li> </ul> </blockquote> <p>In this article, we are going to resize VMs using commands in OpenStack Horizon.</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>Account</strong></p> <p>You need a 3Engines Cloud hosting account with access to the Horizon interface: <a href=https://portal.3Engines.com/ >https://portal.3Engines.com/</a>.</p> <p>No. 2 <strong>How to create a new VM</strong></p> <p>If you are a normal user of 3Engines Cloud hosting, you will have all prerogatives needed to resize the VM. Make sure that the VM you are about to resize belongs to a project you have access to. Here are the basics of creating a Linux VM in Horizon:</p> <p><a href=How-to-create-a-Linux-VM-and-access-it-from-Linux-command-line-on-3Engines-Cloud.html.html>How to create a Linux VM and access it from Linux command line on 3Engines Cloud</a></p> <p><a href=How-to-create-a-Linux-VM-and-access-it-from-Windows-desktop-on-3Engines-Cloud.html.html>How to create a Linux VM and access it from Windows desktop on 3Engines Cloud</a></p> <p>No. 3 <strong>Awareness of existing quotas and flavors limits</strong></p> <p>For general introduction to quotas and flavors, see <a href=Dashboard-Overview-Project-Quotas-And-Flavors-Limits-on-3Engines-Cloud.html.html>Dashboard Overview – Project Quotas And Flavors Limits on 3Engines Cloud</a>.</p> <p>Also:</p> <blockquote> <ul> <li>The VM you want to resize is in an active or shut down state.</li> <li>A flavor with the desired resource configuration exists.</li> <li>Adequate resources are available in your OpenStack environment to accommodate the resize.</li> </ul> </blockquote> <h2 id=creating-a-new-vm>Creating a new VM<a href=#creating-a-new-vm title="Permalink to this headline">🔗</a><a class=headerlink href=#creating-a-new-vm title="Permanent link">¶</a></h2> <p>To illustrate the commands in this article, let us create a new VM in order to start with a clean slate. (It goes without saying that you can practice with any of the already existing VMs in your account.)</p> <p>Use Prerequisite No. 2 to create a new VM and let it be called <strong>Resizing</strong>. Here is a typical list of flavors you might see:</p> <p><a class=glightbox href=../_images/resize-vm-horizon-1.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-1.png src=../_images/resize-vm-horizon-1.png></a></p> <p>For the sake of this article, let us choose a “middle” flavor – not too large and not to small to start with. Let it be <strong>eo2a.large</strong>.</p> <p><a class=glightbox href=../_images/resize-vm-horizon-2.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-2.png src=../_images/resize-vm-horizon-2.png></a></p> <p>Finish the process of creating a new VM and let it spawn:</p> <p><a class=glightbox href=../_images/resize-vm-horizon-3.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-3.png src=../_images/resize-vm-horizon-3.png></a></p> <p>Let us now resize the VM called <strong>Resizing</strong>.</p> <h2 id=steps-to-resize-the-vm>Steps to Resize the VM<a href=#steps-to-resize-the-vm title="Permalink to this headline">🔗</a><a class=headerlink href=#steps-to-resize-the-vm title="Permanent link">¶</a></h2> <p>Locate the VM by using Horizon commands <strong>Compute</strong> -> <strong>Instances</strong>.</p> <p>Click the dropdown arrow next to the VM and select <strong>Resize Instance</strong>.</p> <p><a class=glightbox href=../_images/resize-vm-horizon-4.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-4.png src=../_images/resize-vm-horizon-4.png></a></p> <p>You get form <strong>Resize Instance</strong> on screen:</p> <p><a class=glightbox href=../_images/resize-vm-horizon-5.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-5.png src=../_images/resize-vm-horizon-5.png></a></p> <p>Assuming you wanted to scale up the VM, you could decide upon <strong>eo2.xlarge</strong>. Let us compare the two flavors:</p> <table> <thead> <tr> <th>Flavor</th> <th>VCPUs</th> <th>RAM</th> <th>Total Disk</th> <th>Root Disk</th> </tr> </thead> <tbody> <tr> <td>eo2a.large</td> <td>2</td> <td>7.45 GB</td> <td>32 GB</td> <td>32 GB</td> </tr> <tr> <td>eo2.xlarge</td> <td>4</td> <td>16 GB</td> <td>64 GB</td> <td>64 GB</td> </tr> </tbody> </table> <p>So, select <strong>eo2.xlarge</strong> as the new flavor. This screen shows its parameters:</p> <p><a class=glightbox href=../_images/fwaas-openvpn-v2-34.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=fwaas-openvpn-v2-34.png src=../_images/fwaas-openvpn-v2-34.png></a></p> <h2 id=advanced-options>Advanced Options<a href=#advanced-options title="Permalink to this headline">🔗</a><a class=headerlink href=#advanced-options title="Permanent link">¶</a></h2> <p><strong>Advanced Options</strong> tab contains two further options for resizing the instance.</p> <p><a class=glightbox href=../_images/resize-vm-horizon-10.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-10.png src=../_images/resize-vm-horizon-10.png></a></p> <dl> <dt>Disk Partition</dt> <dd>Whether the entire disc is a single partition and automatically resizes. Options are <strong>Automatic</strong> and <strong>Manual</strong></dd> <dt>Server Group</dt> <dd> <p>Here you select server group to which the instance can belong after resizing. Even if you never manually created a server group, they may be present as a consequence of creating Kubernete clusters, or using parameters for group affinity.</p> <p>The list can be quite long:</p> <p><a class=glightbox href=../_images/resize-vm-horizon-11.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-11.png src=../_images/resize-vm-horizon-11.png></a></p> </dd> </dl> <h2 id=resize-the-vm>Resize the VM<a href=#resize-the-vm title="Permalink to this headline">🔗</a><a class=headerlink href=#resize-the-vm title="Permanent link">¶</a></h2> <p>Anyways, click on <strong>Resize</strong> to proceed with the resizing of the VM.</p> <p><a class=glightbox href=../_images/resize-vm-horizon-8.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-8.png src=../_images/resize-vm-horizon-8.png></a></p> <p>In <strong>Status</strong> column, there will be message <strong>Confirm or Revert Resize/Migrate</strong>. It means the system is waiting for you to decide what to do next. To confirm the resizing/migrating process, click on button <strong>Confirm Resize/Migrate</strong> in the <strong>Actions</strong> column.</p> <p>The resizing process will finish within a couple of seconds and the VM will be in <strong>Status</strong> Active.</p> <p>If you encounter issues, you can choose <strong>Revert Resize</strong> to return the VM to its previous state. This option is, however, only available before <strong>Resize/Migration Confirmation</strong>.</p> <p>Or, if the resizing is finished, you can again use option <strong>Resize instance</strong> and choose the flavor from which you started (<strong>eo2a.large</strong> in this case). This process of scaling down is much faster than the process of scaling up.</p> <h2 id=troubleshooting>Troubleshooting<a href=#troubleshooting title="Permalink to this headline">🔗</a><a class=headerlink href=#troubleshooting title="Permanent link">¶</a></h2> <p>If any of the flavor parameters does not match up, the resizing will fail.</p> <p>You will then see balloon help in the right upper corner:</p> <p><a class=glightbox href=../_images/resize-vm-horizon-7.png data-type=image data-width=100% data-height=auto data-desc-position=bottom><img alt=resize-vm-horizon-7.png src=../_images/resize-vm-horizon-7.png></a></p> <p>In this case, the sizes of the disk before and after the resizing do not match.</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>You can also resize the virtual machine using only OpenStack CLI. 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