第 14 章 Exporting resource constraints as pcs commands

Procedure

1. Create an IPaddr2 resource named VirtualIP.

   # pcs resource create VirtualIP IPaddr2 ip=198.51.100.3 cidr_netmask=24
   Assumed agent name 'ocf:heartbeat:IPaddr2' (deduced from 'IPaddr2')

2. Create an apache resource named Website.

   # pcs resource create Website apache configfile="/etc/httpd/conf/httpd.conf" statusurl="http://127.0.0.1/server-status"
   Assumed agent name 'ocf:heartbeat:apache' (deduced from 'apache')

3. Configure a location constraint for the Website resource.

   # pcs constraint location Website avoids node1

4. Configure a colocation constraint for the Website and VirtualIP resources.

   # pcs constraint colocation add Website with VirtualIP

5. Configure an order constraint for the Website and VirtualIP resources.

   # pcs constraint order VirtualIP then Website
   Adding VirtualIP Website (kind: Mandatory) (Options: first-action=start then-action=start)

6. Display the pcs commands you can use to re-create the constraints on a different system.

   # pcs constraint --output-format=cmd
   pcs -- constraint location add location-Website-node1--INFINITY resource%Website node1 -INFINITY;
   pcs -- constraint colocation add Website with VirtualIP INFINITY \
     id=colocation-Website-VirtualIP-INFINITY;
   pcs -- constraint order start VirtualIP then start Website \
     id=order-VirtualIP-Website-mandatory