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community-catalog/templates/keepalived/0/README.md
Bob Killen b7c07f27b8
add update sysctl setting
2017-08-03 08:50:15 -04:00

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Keepalived

This catalog recipe enables unicast VRRP based failover for one or more floating IP Addresses. It's intended deployment is for use on a pair edge or ingress nodes where forward-facing load-balancers or other like services will be scheduled.

Form Fields

  • Update Host Sysctl - If true automatically sets the needed sysctl setting on the host.
  • Host Label Name - Host label key name used to schedule keepalived master and backup instances.
  • Master Label - The value of the keepalived host Label to signify the master instance.
  • Backup Label - The value of the keepalived host Label to signify the backup instance.
  • Interface Name - The host interface that keepalived will monitor and use for VRRP traffic.
  • Virtual Router ID - A unique number from 0 to 255 that should identify the VRRP group.
  • Master IP - The IP on the master host that the keepalived daemon should bind to.
  • Backup IP - The IP on the backup host that the keepalived daemon should bind to.
  • Virtual IP - Virtual IP to be created. Must be in ip notation: <ipaddress>/<mask> dev <interface>

Requirements

The host must have the sysctl setting net.ipv4.ip_nonlocal_bind=1 configured.

Usage

This service is intended to be deployed to edge nodes with a master and backup deployed respectively. One or more Virtual IPs may then be bound to hosts. These hosts should have an additional label used for load-balancer scheduling e.g. ingress=true

Adding an HA Load Balancer Service

Ensure your edge hosts have an additional host label before proceeding

  1. From the Stack menu add a new Load Balancer.
  2. Set Scale to be Always run one instance of this container on every host.
  3. Add an appropriate Name and Description.
  4. In the Port Rules section, click Show host IP address options. This enables the Host IP Field.
  5. Update the Port Rules with the Host IP field set to your Virtual IP as defined in the keepalived config. Configure the rest of the fields as needed for your application.
  6. Click on the Scheduling tab and click on Add Scheduling Rule.
  7. Create a rule where "The host must have a host label of <edge node host label> = <edge node host label value>.
  8. Click Create.

Adding additional Virtual IPs to the keepalived Service

  1. From the Stack menu expand the keepalived service.
  2. Select upgrade on the keepalived-backup service.
  3. Add a new Environment Variable called KEEPALIVED_VIRTUAL_IPADDRESS_<number>. Where <number> should be a unique value from 0-999. e.g. KEEPALIVED_VIRTUAL_IPADDRESS_2.
  4. Set the value to be a QUOTED STRING with an additional virtual IP following the standard ip format of <ipaddress>/<mask> dev <interface>. e.g. 10.255.33.102/24 dev eth0.
  5. Press Upgrade.
  6. Repeat the same steps for the keepalived-master service.

Troubleshooting

For further help see the main arc-ts/keepalived git repo