Masakari

What is Masakari ?

Masakari provides a Virtual Machine High Availability(VMHA), and rescues a KVM-based Virtual Machine(VM) from a failure events of the following:

VM process down - restart vm (use nova stop API, and nova start API)
provisioning process down - restart process or changes nova-compute service status to maintenance mode (use nova service-disable)
nova-compute host failure - evacuate all the VMs from failure host to reserved host (use nova evacuate API)

Try masakari-deploy for all-in-one scripts to deploy it on your laptop.

Architecture

masakari-controller : controller process for failure notification
masakari-instancemonitor : detects the VMs process down
masakari-processmonitor : detects the fatal control process down on nova-compute node
masakari-hostmonitor : detects the compute host failure

Prerequisites

openstack system
- Make sure nova and keystone are installed
- Deploy OpenStack Compute with a shared file system
pacemaker
- Setup stonith resources to make sure a failed host must be in shutdown after an error
  - If the host is in power-on after evacuating, it could cause double mounted volumes because of the Nova evacuate API's spec.
packages
- python-daemon: apt-get install python-daemon
- dh-make: apt-get install dh-make (it's nessesary in case of Ubuntu)
create user (user: openstack) and setup passwordless for 'sudo'
set up '/etc/hosts' or DNS server for host name resolving

Installation

components installation

ex) Ubuntu

# cd (each components directory)  * ex: masakari, hostmonitor etc
# ./debian/rules binary
# dpkg -i (each components).deb

database setting

create database and tables for masakari

# cd masakari-controller/db
# vi db.conf
DB_USER=<mysql user>
DB_PASSWORD=<mysql user password>
DB_HOST=<mysql host ip>
# bash create_vmha_database.sh

config setting

masakari-controller.conf

# vi /etc/masakari/masakari-controller.conf
...
[db]
host = <mysql host ip>
name = vm_ha 
user = <mysql user>
passwd = <mysql user password>
charset = utf8
...
[nova]
domain = <keystone top level domain name>
admin_user = <admin user>
admin_password = <admin user password>
auth_url =  <auth_url>
project_name = <tenant name>
...

masakari-instancemonitor.conf

# vi /etc/masakari/masakari-instancemonitor.conf
[callback]
# Event notification destination URL
url = http://<masakari server ip>:15868
...
# regionID
regionID=<openstack region name. ex) RegionOne >
...

masakari-hostmonitor.conf

# vi /etc/masakari/masakari-hostmonitor.conf
# URL of recovery controller
RM_URL="http://<masakari server ip>:15868"
...
# Region unit
# This item is necessary
REGION_ID="<openstack region name ex) RegionOne>"

masakari-processmonitor.conf

# vi /etc/masakari/masakari-processmonitor.conf
RESOURCE_MANAGER_URL="http://<masakari server ip>:15868"
...
REGION_ID=<openstack region name. ex) RegionOne >

Reserved host setting for nova-compute host failure

If a nova-compute host fails, masakari evacuates instances on the failed host to the reserved host. In advance, you reserve one or two host(s) per a pacemaker cluster. Please follow this instruction.

# cd masakari/utils

Add

# python reserve_host_manage.py --mode add  --port "226.94.1.1:5405" --host compute2  --db-user root --db-password mysql --db-host 127.0.0.1

List

# python reserve_host_manage.py --mode list  --db-user root --db-password mysql --db-host 127.0.0.1

Delete

# python reserve_host_manage.py --mode delete  --port "226.94.1.1:5405" --host compute2  --db-user root --db-password mysql --db-host 127.0.0.1

Update

# python reserve_host_manage.py --mode update  --port "226.94.1.1:5405"  --before-host compute2  --after-host compute1  --db-user root --db-password mysql --db-host 127.0.0.1

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