bea1e1954a
When using XenServer as hypervisor, install_os_domU.sh will create integration bridge for compute node when neutron network is used. But it should provide a way to allow moving of the VM to another host (with a different XEN_INTEGRATION_BRIDGE) for easier install. This patch is to provide the way to let user have the chance to configure integration bridge themselves Change-Id: If923a5e978e77fc091d24b6e1fe7a83a3375da09
179 lines
6.4 KiB
Markdown
179 lines
6.4 KiB
Markdown
# Getting Started With XenServer and Devstack
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The purpose of the code in this directory it to help developers bootstrap a
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XenServer 6.2 (older versions may also work) + OpenStack development
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environment. This file gives some pointers on how to get started.
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Xenserver is a Type 1 hypervisor, so it is best installed on bare metal. The
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OpenStack services are configured to run within a virtual machine (called OS
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domU) on the XenServer host. The VM uses the XAPI toolstack to communicate with
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the host over a network connection (see `MGT_BRIDGE_OR_NET_NAME`).
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The provided localrc helps to build a basic environment.
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## Introduction
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### Requirements
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- An internet-enabled network with a DHCP server on it
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- XenServer box plugged in to the same network
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This network will be used as the OpenStack management network. The VM Network
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and the Public Network will not be connected to any physical interfaces, only
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new virtual networks will be created by the `install_os_domU.sh` script.
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### Steps to follow
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- Install XenServer
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- Download Devstack to XenServer
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- Customise `localrc`
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- Start `install_os_domU.sh` script
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### Brief explanation
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The `install_os_domU.sh` script will:
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- Setup XenAPI plugins
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- Create the named networks, if they don't exist
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- Preseed-Netinstall an Ubuntu Virtual Machine (NOTE: you can save and reuse
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it, see [Reuse the Ubuntu VM](#reuse-the-ubuntu-vm)), with 1 network
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interface:
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- `eth0` - Connected to `UBUNTU_INST_BRIDGE_OR_NET_NAME`, defaults to
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`MGT_BRIDGE_OR_NET_NAME`
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- After the Ubuntu install process finished, the network configuration is
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modified to:
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- `eth0` - Management interface, connected to `MGT_BRIDGE_OR_NET_NAME`. Xapi
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must be accessible through this network.
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- `eth1` - VM interface, connected to `VM_BRIDGE_OR_NET_NAME`
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- `eth2` - Public interface, connected to `PUB_BRIDGE_OR_NET_NAME`
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- Start devstack inside the created OpenStack VM
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## Step 1: Install Xenserver
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Install XenServer on a clean box. You can download the latest XenServer for
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free from: http://www.xenserver.org/
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The XenServer IP configuration depends on your local network setup. If you are
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using dhcp, make a reservation for XenServer, so its IP address won't change
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over time. Make a note of the XenServer's IP address, as it has to be specified
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in `localrc`. The other option is to manually specify the IP setup for the
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XenServer box. Please make sure, that a gateway and a nameserver is configured,
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as `install_os_domU.sh` will connect to github.com to get source-code snapshots.
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## Step 2: Download devstack
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On your XenServer host, run the following commands as root:
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wget --no-check-certificate https://github.com/openstack-dev/devstack/zipball/master
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unzip -o master -d ./devstack
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cd devstack/*/
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## Step 3: Configure your localrc inside the devstack directory
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Devstack uses a localrc for user-specific configuration. Note that
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the `XENAPI_PASSWORD` must be your dom0 root password.
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Of course, use real passwords if this machine is exposed.
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cat > ./localrc <<EOF
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# At the moment, we depend on github's snapshot function.
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GIT_BASE="http://github.com"
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# Passwords
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# NOTE: these need to be specified, otherwise devstack will try
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# to prompt for these passwords, blocking the install process.
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DATABASE_PASSWORD=my_super_secret
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ADMIN_PASSWORD=my_super_secret
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SERVICE_PASSWORD=my_super_secret
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RABBIT_PASSWORD=my_super_secret
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SWIFT_HASH="66a3d6b56c1f479c8b4e70ab5c2000f5"
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# This will be the password for the OpenStack VM (both stack and root users)
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GUEST_PASSWORD=my_super_secret
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# XenAPI parameters
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# NOTE: The following must be set to your XenServer root password!
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XENAPI_PASSWORD=my_xenserver_root_password
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XENAPI_CONNECTION_URL="http://address_of_your_xenserver"
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VNCSERVER_PROXYCLIENT_ADDRESS=address_of_your_xenserver
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# Explicitly set virt driver
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VIRT_DRIVER=xenserver
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# Explicitly enable multi-host for nova-network HA
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MULTI_HOST=1
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# Give extra time for boot
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ACTIVE_TIMEOUT=45
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EOF
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## Step 4: Run `./install_os_domU.sh` from the `tools/xen` directory
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cd tools/xen
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./install_os_domU.sh
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Once this script finishes executing, log into the VM (openstack domU) that it
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installed and tail the run.sh.log file. You will need to wait until it run.sh
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has finished executing.
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# Appendix
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This section contains useful information for running devstack in CI
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environments / using ubuntu network mirrors.
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## Use a specific Ubuntu mirror for installation
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To speed up the Ubuntu installation, you can use a specific mirror. To specify
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a mirror explicitly, include the following settings in your `localrc` file:
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UBUNTU_INST_HTTP_HOSTNAME="archive.ubuntu.com"
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UBUNTU_INST_HTTP_DIRECTORY="/ubuntu"
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These variables set the `mirror/http/hostname` and `mirror/http/directory`
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settings in the ubuntu preseed file. The minimal ubuntu VM will use the
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specified parameters.
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## Use an http proxy to speed up Ubuntu installation
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To further speed up the Ubuntu VM and package installation, an internal http
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proxy could be used. `squid-deb-proxy` has prooven to be stable. To use an http
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proxy, specify:
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UBUNTU_INST_HTTP_PROXY="http://ubuntu-proxy.somedomain.com:8000"
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in your `localrc` file.
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## Reuse the Ubuntu VM
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Performing a minimal ubuntu installation could take a lot of time, depending on
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your mirror/network speed. If you run `install_os_domU.sh` script on a clean
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hypervisor, you can speed up the installation, by re-using the ubuntu vm from
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a previous installation.
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### Export the Ubuntu VM to an XVA
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Given you have an nfs export `TEMPLATE_NFS_DIR`:
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TEMPLATE_FILENAME=devstack-jeos.xva
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TEMPLATE_NAME=jeos_template_for_devstack
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mountdir=$(mktemp -d)
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mount -t nfs "$TEMPLATE_NFS_DIR" "$mountdir"
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VM="$(xe template-list name-label="$TEMPLATE_NAME" --minimal)"
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xe template-export template-uuid=$VM filename="$mountdir/$TEMPLATE_FILENAME"
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umount "$mountdir"
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rm -rf "$mountdir"
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### Import the Ubuntu VM
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Given you have an nfs export `TEMPLATE_NFS_DIR` where you exported the Ubuntu
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VM as `TEMPLATE_FILENAME`:
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mountdir=$(mktemp -d)
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mount -t nfs "$TEMPLATE_NFS_DIR" "$mountdir"
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xe vm-import filename="$mountdir/$TEMPLATE_FILENAME"
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umount "$mountdir"
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rm -rf "$mountdir"
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### Migrate OpenStack DomU to another host
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Given you need to migrate your DomU with OpenStack installed to another host,
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you need to set `XEN_INTEGRATION_BRIDGE` in localrc if neutron network is used.
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It is the bridge for `XEN_INT_BRIDGE_OR_NET_NAME` network created in Dom0
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