Here is OpenStack in a realistic test configuration with multiple physical servers.
You need to have a system with a fresh install of Linux. You can download the Minimal CD for Ubuntu releases since DevStack will download & install all the additional dependencies. The netinstall ISO is available for Fedora and CentOS/RHEL.
Install a couple of packages to bootstrap configuration:
apt-get install -y git sudo || yum install -y git sudo
The first iteration of the lab uses OpenStack's FlatDHCP network controller so only a single network will be required. It should be on its own subnet without DHCP; the host IPs and floating IP pool(s) will come out of this block. This example uses the following:
Configure each node with a static IP.
For Ubuntu edit /etc/network/interfaces:
auto eth0
iface eth0 inet static
address 192.168.42.11
netmask 255.255.255.0
gateway 192.168.42.1
For Fedora and CentOS/RHEL edit
/etc/sysconfig/network-scripts/ifcfg-eth0:
BOOTPROTO=static IPADDR=192.168.42.11 NETMASK=255.255.255.0 GATEWAY=192.168.42.1
OpenStack runs as a non-root user that has sudo access to root. There is nothing special
about the name, we'll use stack here. Every node must use the same name and
preferably uid. If you created a user during the OS install you can use it and give it
sudo priviledges below. Otherwise create the stack user:
groupadd stack useradd -g stack -s /bin/bash -d /opt/stack -m stack
This user will be making many changes to your system during installation and operation so it needs to have sudo priviledges to root without a password:
echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
From here on use the stack user. Logout and login as the
stack user.
Set up the stack user on each node with an ssh key for access:
mkdir ~/.ssh; chmod 700 ~/.ssh echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCyYjfgyPazTvGpd8OaAvtU2utL8W6gWC4JdRS1J95GhNNfQd657yO6s1AH5KYQWktcE6FO/xNUC2reEXSGC7ezy+sGO1kj9Limv5vrvNHvF1+wts0Cmyx61D2nQw35/Qz8BvpdJANL7VwP/cFI/p3yhvx2lsnjFE3hN8xRB2LtLUopUSVdBwACOVUmH2G+2BWMJDjVINd2DPqRIA4Zhy09KJ3O1Joabr0XpQL0yt/I9x8BVHdAx6l9U0tMg9dj5+tAjZvMAFfye3PJcYwwsfJoFxC8w/SLtqlFX7Ehw++8RtvomvuipLdmWCy+T9hIkl+gHYE4cS3OIqXH7f49jdJf jesse@spacey.local" > ~/.ssh/authorized_keys
Grab the latest version of DevStack from github:
git clone https://github.com/openstack-dev/devstack.git cd devstack
Up to this point all of the steps apply to each node in the cluster. From here on there are some differences between the cluster controller (aka 'head node') and the compute nodes.
The cluster controller runs all OpenStack services. Configure the cluster controller's DevStack in local.conf:
[[local|localrc]] HOST_IP=192.168.42.11 FLAT_INTERFACE=eth0 FIXED_RANGE=10.4.128.0/20 FIXED_NETWORK_SIZE=4096 FLOATING_RANGE=192.168.42.128/25 MULTI_HOST=1 LOGFILE=/opt/stack/logs/stack.sh.log ADMIN_PASSWORD=labstack MYSQL_PASSWORD=supersecret RABBIT_PASSWORD=supersecrete SERVICE_PASSWORD=supersecrete SERVICE_TOKEN=xyzpdqlazydog
In the multi-node configuration the first 10 or so IPs in the private subnet are usually reserved. Add this to local.sh to have it run after every stack.sh run:
for i in `seq 2 10`; do /opt/stack/nova/bin/nova-manage fixed reserve 10.4.128.$i; done
Fire up OpenStack:
./stack.sh
A stream of activity ensues. When complete you will see a summary of
stack.sh's work, including the relevant URLs, accounts and passwords to poke at your
shiny new OpenStack. The most recent log file is available in stack.sh.log.
The compute nodes only run the OpenStack worker services. For additional machines, create a local.conf with:
HOST_IP=192.168.42.12 # change this per compute node FLAT_INTERFACE=eth0 FIXED_RANGE=10.4.128.0/20 FIXED_NETWORK_SIZE=4096 FLOATING_RANGE=192.168.42.128/25 MULTI_HOST=1 LOGFILE=/opt/stack/logs/stack.sh.log ADMIN_PASSWORD=labstack MYSQL_PASSWORD=supersecret RABBIT_PASSWORD=supersecrete SERVICE_PASSWORD=supersecrete SERVICE_TOKEN=xyzpdqlazydog DATABASE_TYPE=mysql SERVICE_HOST=192.168.42.11 MYSQL_HOST=192.168.42.11 RABBIT_HOST=192.168.42.11 GLANCE_HOSTPORT=192.168.42.11:9292 ENABLED_SERVICES=n-cpu,n-net,n-api,c-sch,c-api,c-vol NOVA_VNC_ENABLED=True NOVNCPROXY_URL="http://192.168.42.11:6080/vnc_auto.html" VNCSERVER_LISTEN=$HOST_IP VNCSERVER_PROXYCLIENT_ADDRESS=$VNCSERVER_LISTEN
Fire up OpenStack:
./stack.sh
A stream of activity ensues. When complete you will see a summary of
stack.sh's work, including the relevant URLs, accounts and passwords to poke at your
shiny new OpenStack. The most recent log file is available in stack.sh.log.
Shutting down OpenStack is now as simple as running the included unstack.sh script:
./unstack.sh
A more aggressive cleanup can be performed using clean.sh. It removes certain troublesome packages and attempts to leave the system in a state where changing the database or queue manager can be reliably performed.
./clean.sh
Sometimes running instances are not cleaned up. DevStack attempts to do this when it runs but there are times it needs to still be done by hand:
sudo rm -rf /etc/libvirt/qemu/inst*
sudo virsh list | grep inst | awk '{print $1}' | xargs -n1 virsh destroy
DevStack creates two OpenStack users (admin and demo) and two tenants (also admin and demo). admin is exactly what it sounds like, a priveleged administrative account that is a member of both the admin and demo tenants. demo is a normal user account that is only a member of the demo tenant. Creating additional OpenStack users can be done through the dashboard, sometimes it is easier to do them in bulk from a script, especially since they get blown away every time
stack.sh runs. The following steps are ripe for scripting:
# Get admin creds
. openrc admin admin
# List existing tenants
keystone tenant-list
# List existing users
keystone user-list
# Add a user and tenant
NAME=bob
PASSWORD=BigSecrete
TENANT=$NAME
keystone tenant-create --name=$NAME
keystone user-create --name=$NAME --pass=$PASSWORD
keystone user-role-add --user-id=<bob-user-id> --tenant-id=<bob-tenant-id> --role-id=<member-role-id>
# member-role-id comes from the existing member role created by stack.sh
# keystone role-list
Swift requires a significant amount of resources and is disabled by default in DevStack.
The support in DevStack is geared toward a minimal installation but can be used for
testing. To implement a true multi-node test of Swift required more than DevStack provides.
Enabling it is as simple as enabling the swift service in local.conf:
enable_service swift
Swift will put its data files in SWIFT_DATA_DIR (default /opt/stack/data/swift).
The size of the data 'partition' created (really a loop-mounted file) is set by
SWIFT_LOOPBACK_DISK_SIZE. The Swift config files are located in
SWIFT_CONFIG_DIR (default /etc/swift). All of these settings can be overridden in
(wait for it...) local.conf.
DevStack will automatically use an existing LVM volume group named stack-volumes
to store cloud-created volumes. If stack-volumes doesn't exist, DevStack
will set up a 5Gb loop-mounted file to contain it. This obviously limits the
number and size of volumes that can be created inside OpenStack. The size can be
overridden by setting VOLUME_BACKING_FILE_SIZE in local.conf.
stack-volumes can be pre-created on any physical volume supported by
Linux's LVM. The name of the volume group can be changed by setting VOLUME_GROUP
in localrc. stack.sh deletes
all logical volumes in VOLUME_GROUP that begin with
VOLUME_NAME_PREFIX as part of cleaning up from previous runs.
It is recommended to not use the root volume group as VOLUME_GROUP.
The details of creating the volume group depends on the server hardware involved but looks something like this:
pvcreate /dev/sdc vgcreate stack-volumes /dev/sdc
DevStack is capable of using rsyslog to agregate logging across the cluster.
It is off by default; to turn it on set SYSLOG=True in local.conf.
SYSLOG_HOST defaults to HOST_IP; on the compute nodes it
must be set to the IP of the cluster controller to send syslog output there. In the example
above, add this to the compute node local.conf:
SYSLOG_HOST=192.168.42.11
The git repositories for all of the OpenStack services are defined in stackrc.
Since this file is a part of the DevStack package changes to it will probably be overwritten
as updates are applied. Every setting in stackrc can be redefined in
local.conf.
To change the repository or branch that a particular OpenStack service is created from,
simply change the value of *_REPO or *_BRANCH corresponding to
that service.
After making changes to the repository or branch, if RECLONE is not set
in localrc it may be necessary to remove the corresponding directory from
/opt/stack to force git to re-clone the repository.
For example, to pull Nova from a proposed release candidate in the primary Nova repository:
NOVA_BRANCH=rc-proposed
To pull Glance from an experimental fork:
GLANCE_BRANCH=try-something-big GLANCE_REPO=https://github.com/mcuser/glance.git
How to reset the bridge configuration:
sudo brctl delif br100 eth0.926 sudo ip link set dev br100 down sudo brctl delbr br100
If you forgot to set the root password you can do this:
mysqladmin -u root -pnova password 'supersecret'