OpenStack

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Revision as of 16:26, 11 December 2018 by Beb82 (talk | contribs) (→‎Networks: adding floating IPs)
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Warning: This page is currently under construction. Information may not be ready for users.

OpenStack is an open-source cloud stack that is currently running on Red Cloud. Also, for more information, see the Official Documentation for OpenStack. If you are looking for information on how to migrate an instance from Eucalyptus to OpenStack, please see Migrating from Eucalyptus to OpenStack.

Using the OpenStack Web Interface (Horizon)

There are two ways to manage Red Cloud resources:

  1. OpenStack Web Interface
  2. OpenStack CLI

Most users will use the OpenStack Web Interface (called Horizon). This web-based interface can be used to manage instances and volumes. For Linux Instances, however, some users may choose to use the OpenStack CLI. This section focuses on the OpenStack Web Interface.

Logging In

Log in to the OpenStack Web Interface to create and manage Red Cloud resources. There are two ways to login:

  1. CAC Account - Enter cac as the "Domain" and your CAC username and password, not your Cornell NetID. If your CAC password has expired, you will need to

reset it before you will be able to login to the OpenStack Web Interface.

  1. Globus Auth - Log in through Globus
    • Currently, this feature is only available to Aristotle users. This feature will be enabled for all users in the future.
    • You must link your Cornell account, or any accounts attached to the projects you are on, in order to have access to them when using Globus Auth.
    • If you can't log in with Globus Auth, it may be that you have not linked your account yet.

RedCloudCACLogin.pngWhite square.pngRedCloudGlobusAuthLogin.png

You can use the "Authenticate using" drop-down to switch between the two options. Neither option requires you to enter a project ID; you can switch between the projects you are on once logged in.

Overview Page

The Overview page is the first place you will be taken upon logging into Red Cloud.

  • Provides easy access to main functions, but many functions can be accessed from other pages
  • Provides useful metrics on currently selected project
  • Before creating an instance, you will need to:

Key Pairs

Overview KeyPairs Circled.png

This is obviously visible along the top bar when compute is selected: Key Pairs

Can create or upload.

Can't create or upload during Instance setup.

Security Groups

Overview SecurityGroups.png

Getting to this is not obvious: Security Groups

Can't create one during Instance setup.

Instances

InstancesMenu.png


Launch an Instance

InstancesFullTitleBar.png


InstancesOptions.png


  1. Create Key Pair
  2. Create a Security Group

InstanceLaunchMenuFull.png

Note: During instance creation, on the "Source" tab, the option for "Delete Volume on Instance Delete" determines whether or not your root volume will be deleted when you terminate the instance. By default, this option is set to "No" to prevent accidental deletion of your data. However, if you do not intend to re-use the root volume, you could unintentionally incur excess storage usage. You can either delete the root volume manually later (it will show up in the list of volumes with the ID the same as the name), or select "Yes" on this option to automatically delete it when you terminate your instance.

InstanceLaunchMenu.png

Flavors Note: if you are using Windows you need a 'w' instance (indeed Horizon will force you to use it since the WIndows image is > 10GB). If you are using Linux, you have a choice; if you anticipate to install a lot of packages, you may want a 'w' instance as well (50 GB), otherwise, we suggest you choose a 'c' instance (10 GB) to save on storage costs. Data should ideally be stored on a separate volume when there is any substantial amount of it, not just to make resizing easier, but to make it independent of the OS volume should something happen to it (bad upgrade, desire to switch OS, etc), so data size should not really enter into the user's decision about what to pick here.

Types of Images

Volumes

Create and Attach a Volume

Types of Storage

Networks

Use the 'public' net if you want some form of public (but possibly restricted) access from the internet and don't care about having an extremely stable IP. Somewhat counter-intuitively, you want a 'private' network if you want to get a stable "floating" IP address (called an elastic IP address in Eucalyptus and AWS); this is also highly reccomended if you plan to have a registered domain name pointing to the instance. You can also use a private network if you want some or all of the instances on the private network to not be directly accessible from the internet. The list of networks for the currently selected project can be viewed in OpenStack Horizon.

Note that you can actually have an instance that is both part of the 'public' network and a 'private' network.

  • Public net
    • No action is needed to use this, other than selecting it.
    • This should be acceptable for many uses, e.g. compute instances.
    • IP address will be stable through reboots, but not necessarily through hard shutdowns (e.g. shelving).
    • You can not assign a floating IP to an instance via its membership in a public network. Please do not allocate floating IP addresses on a public network.
  • Setting up your own private network
  1. ssh into linuxlogin.cac.cornell.edu; this can be done using your CU netid and CAC password: ssh netid@linuxlogin.cac.cornell.edu.
  2. source the openrc for the desired project, which is obtainable via from OpenStack Horizon once the desired project is selected in Horizone
  3. Run the network creation script with a single argument (network name), e.g.: /opt/openstack/create-private-net.sh my-net-name.

You can switch an instance from public to private by doing attach interface / detach interface from the instance dropdown menu.

Note that network names are not unique, but IDs are. You can rename a network without renaming the subnet (but you can rename it too, separately), all possible via the Horizon web UI. The subnets are private, and exposed externally by a Router. Networks and routers won't be deleted if there are any active connections on them. There is also a delete network script that should be used instead of the Horizon web UI for a cleaner deletion: /opt/openstack/delete-private-net.sh.

  • Getting a floating (stable) IP
    • See the prerequisite steps above for "Setting up your own private network"
    • In Horizon, under the Networks tab, select "Floating IPs", which should send you here.
    • Click "Allocate IP to Project"
    • The only pool will be "public"; click "allocate".
    • From the list of floating IPs, click "Associate"; make sure you pick a "port" that is an instance's interface on a previously created private network, NOT a public network.
    • Note that if you not longer need the floating IP, please release it back to the pool by selecting the "Release Floating IP" from the Actions dropdown menu.
    • When changing the associated floating IPs of an instance, security groups may be dropped, so you may need to edit the security groups after the fact from the instance dropdown menu.