Difference between revisions of "HAGuideImprovements/TOC"
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== HA Intro and Concepts == | == HA Intro and Concepts == | ||
+ | :# Redundancy and failover | ||
+ | :# Stateless/stateful, active/passive, active/active | ||
+ | :# Quorums; many services should use an odd number of nodes equal to or greater than 3 | ||
+ | :# Single-controller HA mode | ||
== Hardware setup == | == Hardware setup == | ||
+ | :# Minimal Architecture Example -- Network Layout, styled as in http://docs.openstack.org/juno/install-guide/install/apt/content/ch_basic_environment.html#basics-prerequisites for easy comparison | ||
== Prerequisites == | == Prerequisites == | ||
:# Link to Install Guide: Install O/S on each node | :# Link to Install Guide: Install O/S on each node | ||
− | :# Install pacemaker, crmsh, corosync, cluster-glue, fence-agents (Fedora only), resource-agents | + | :# Install pacemaker (or is this deprecated?), crmsh, corosync, cluster-glue, fence-agents (Fedora only), resource-agents |
:# Set up and start Corosync and Pacemaker | :# Set up and start Corosync and Pacemaker | ||
:# Set basic cluster properties | :# Set basic cluster properties | ||
+ | :# API services | ||
+ | :# Schedulers | ||
+ | :# Memcached service | ||
== Configure network interface on each node == | == Configure network interface on each node == | ||
− | Link to Networking Guide | + | :# Link to Networking Guide |
+ | :# (Neutron agents should be described for active/active; deprecate single agent's instances case) | ||
+ | :# For Kilo and beyond, focus on L3HA and DVR | ||
== Install and Configure MySQL == | == Install and Configure MySQL == | ||
− | Two nodes plus GARBD | + | :# Two nodes plus GARBD. |
+ | :# MySQL with Galera | ||
+ | :# Deprecate MySQL DRBD configuration because of split-brain issues | ||
+ | |||
+ | == RabbitMQ Message broker == | ||
+ | :# Oslo messaging for active/active | ||
+ | :# No need for active/passive AMQP; consider mirrored two-node cluster instead | ||
+ | :# Deprecate DRBD for RabbitMQ | ||
+ | |||
+ | == NTP == | ||
+ | :# Link to Install Guide | ||
+ | == Keystone Identity services == |
Revision as of 06:17, 18 February 2015
We are planning to improve the networking section of the HA Guide. This is the proposed TOC.
NOTE: This is the original for us to depart from.
I. Introduction to OpenStack High Availability
- Stateless vs. Stateful services
- Active/Passive
- Active/Active
II. HA Using Active/Passive
1. The Pacemaker Cluster Stack
- Installing Packages
- Setting up Corosync
- Starting Corosync
- Starting Pacemaker
- Setting basic cluster properties
2. Cloud Controller Cluster Stack
- Highly available MySQL
- Highly available RabbitMQ
3. API Node Cluster Stack
- Configure the VIP
- Highly available OpenStack Identity
- Highly available OpenStack Image API
- Highly available Cinder API
- Highly available OpenStack Networking Server
- Highly available Ceilometer Central Agent
- Configure Pacemaker Group
4. Network Controller Cluster Stack
- Highly available Neutron L3 Agent
- Highly available Neutron DHCP Agent
- Highly available Neutron Metadata Agent
- Manage network resources
III. HA Using Active/Active
5. Database
- MySQL with Galera
- Galera Monitoring Scripts
- Other ways to provide a Highly Available database
6. RabbitMQ
- Install RabbitMQ
- Configure RabbitMQ
- Configure OpenStack Services to use RabbitMQ
7. HAproxy Nodes 8. OpenStack Controller Nodes
- Running OpenStack API & schedulers
- Memcached
9. OpenStack Network Nodes
- Running Neutron DHCP Agent
- Running Neutron L3 Agent
- Running Neutron Metadata Agent
Contents
Proposed Revision
Strategy and assumptions:
- Audience is people who have some experience installing OpenStack, not first time users
- Focus on installation of OpenStack core services
- Structure the guide sequentially -- the steps to take in a reasonable order
- Avoid redundancy with the Install Guide; for steps that are identical for HA and non-HA installations, link to appropriate sections in the Install Guide
- One guide for all Linux distros/platforms
- Emphasize a reasonable, standard deployment based on open source components. We can provide some notes about alternatives as appropriate (for example, using a commercial load-balancer might be a better alternative than relying on HAProxy) and perhaps a link to the OpenStack Marketplace.
HA Intro and Concepts
- Redundancy and failover
- Stateless/stateful, active/passive, active/active
- Quorums; many services should use an odd number of nodes equal to or greater than 3
- Single-controller HA mode
Hardware setup
- Minimal Architecture Example -- Network Layout, styled as in http://docs.openstack.org/juno/install-guide/install/apt/content/ch_basic_environment.html#basics-prerequisites for easy comparison
Prerequisites
- Link to Install Guide: Install O/S on each node
- Install pacemaker (or is this deprecated?), crmsh, corosync, cluster-glue, fence-agents (Fedora only), resource-agents
- Set up and start Corosync and Pacemaker
- Set basic cluster properties
- API services
- Schedulers
- Memcached service
Configure network interface on each node
- Link to Networking Guide
- (Neutron agents should be described for active/active; deprecate single agent's instances case)
- For Kilo and beyond, focus on L3HA and DVR
Install and Configure MySQL
- Two nodes plus GARBD.
- MySQL with Galera
- Deprecate MySQL DRBD configuration because of split-brain issues
RabbitMQ Message broker
- Oslo messaging for active/active
- No need for active/passive AMQP; consider mirrored two-node cluster instead
- Deprecate DRBD for RabbitMQ
NTP
- Link to Install Guide