Hi All,
I am implementing 2 node RedHat (RHEL 7.2) HA cluster on Amazon EC2
instance. For floating IP I am using a shell script provided by AWS so
that virtual IP float to another instance if any one server failed with
health check. In basic level cluster is working but I have 2 issues on
that which I describe in bellow.
ISSUE 1
=====
Now I need to configure fencing/STONITH to avoid split brain scenario in
storage cluster. I want to use multi-primari (Active/Active) DRBD in my
cluster for distributed storage. Is it possible to configure power
fencing on AWS EC2 instance? Can any one please guide me on this?
ISSUE2
=====
Currently I am using single primary DRBD distributed storage. I added
cluster resources so that if any cluster node goes down then another
cluster node will promoted DRBD volume as primary and mount it on
/var/www/html.
This configuration is working but for only if cluster node1 goes down.
If cluster node2 goes down all cluster resources fails over towards
cluster node1 but whenever cluster node2 again become on-line then
virtual_ip (cluster ip) ownership automatically goes towards cluster
node2 again. All the remaining resources not failed over like that. In
that case secondary IP stays with Node1 and ownership goes to Node2.
I think this is an issue with resource stickiness or resource constraint
but here I am totally clueless. Can any one please help me on this?
My cluster details:
===========
[root@drbd01 ~]# pcs config
Cluster Name: web_cluster
Corosync Nodes:
ec2-52-24-8-124.us-west-2.compute.amazonaws.com
ec2-52-27-70-12.us-west-2.compute.amazonaws.com
Pacemaker Nodes:
ec2-52-24-8-124.us-west-2.compute.amazonaws.com
ec2-52-27-70-12.us-west-2.compute.amazonaws.com
Resources:
Resource: virtual_ip (class=ocf provider=heartbeat type=IPaddr2)
Attributes: ip=10.98.70.100 cidr_netmask=24
Operations: start interval=0s timeout=20s (virtual_ip-start-interval-0s)
stop interval=0s timeout=20s (virtual_ip-stop-interval-0s)
monitor interval=30s (virtual_ip-monitor-interval-30s)
Resource: WebSite (class=ocf provider=heartbeat type=apache)
Attributes: configfile=/etc/httpd/conf/httpd.conf
statusurl=http://10.98.70.100/server-status
Operations: start interval=0s timeout=40s (WebSite-start-interval-0s)
stop interval=0s timeout=60s (WebSite-stop-interval-0s)
monitor interval=1min (WebSite-monitor-interval-1min)
Master: WebDataClone
Meta Attrs: master-max=1 master-node-max=1 clone-max=2
clone-node-max=1 notify=true
Resource: WebData (class=ocf provider=linbit type=drbd)
Attributes: drbd_resource=r1
Operations: start interval=0s timeout=240 (WebData-start-interval-0s)
promote interval=0s timeout=90
(WebData-promote-interval-0s)
demote interval=0s timeout=90 (WebData-demote-interval-0s)
stop interval=0s timeout=100 (WebData-stop-interval-0s)
monitor interval=60s (WebData-monitor-interval-60s)
Resource: WebFS (class=ocf provider=heartbeat type=Filesystem)
Attributes: device=/dev/drbd1 directory=/var/www/html fstype=xfs
Operations: start interval=0s timeout=60 (WebFS-start-interval-0s)
stop interval=0s timeout=60 (WebFS-stop-interval-0s)
monitor interval=20 timeout=40 (WebFS-monitor-interval-20)
Stonith Devices:
Fencing Levels:
Location Constraints:
Ordering Constraints:
promote WebDataClone then start WebFS (kind:Mandatory)
(id:order-WebDataClone-WebFS-mandatory)
start WebFS then start virtual_ip (kind:Mandatory)
(id:order-WebFS-virtual_ip-mandatory)
start virtual_ip then start WebSite (kind:Mandatory)
(id:order-virtual_ip-WebSite-mandatory)
Colocation Constraints:
WebSite with virtual_ip (score:INFINITY)
(id:colocation-WebSite-virtual_ip-INFINITY)
WebFS with WebDataClone (score:INFINITY) (with-rsc-role:Master)
(id:colocation-WebFS-WebDataClone-INFINITY)
WebSite with WebFS (score:INFINITY)
(id:colocation-WebSite-WebFS-INFINITY)
Resources Defaults:
resource-stickiness: INFINITY
Operations Defaults:
timeout: 240s
Cluster Properties:
cluster-infrastructure: corosync
cluster-name: web_cluster
dc-version: 1.1.13-10.el7-44eb2dd
default-resource-stickiness: INFINITY
have-watchdog: false
no-quorum-policy: ignore
stonith-action: poweroff
stonith-enabled: false
Regards,
Pratip Ghosh.
--
Thanks,
Pratip.
+91-9007515795
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