[Pacemaker] Running remote SSH commands on another server?

[Michael Monette]

I solved my problem by making some hacktacular LSB script called "proxyres". 

When I run a "service proxyres start", it SSHes and runs those restart commands on the Proxy. 
"service proxyres stop" simply exits with 0 
and service proxyres status will netcat a port, 0 success 3 for failure.

It works..But hopefully there is a better method.

Here is what it looks like just for fun:

######
 
[root at mail-2 ~] cat /etc/init.d/proxyres
#!/bin/bash
# Restart the gosh darn Proxy LSB script
# chkconfig: 2345 80 05
# description: RTGDP Script

# RTGDP service controller script
case "$1" in
    start)
        ssh -i "/root/.ssh/proxy_identity" proxy_user at 10.199.0.125 'service mta restart'
        ;;
    stop)
        exit 0
        ;;
    status)
        if nc -vz 10.199.0.125 443 > /dev/null
        then
        echo "Server is up"
        true
        else
        echo "Server is down"
        exit 3
        fi
        ;;
    *)
        echo "Usage: $0 {start|stop|status}"
        exit 1
        ;;
esac
exit 0

######

Thanks,

Mike

----- Original Message -----
From: "Michael Monette" <mmonette at 2keys.ca>
To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org>
Sent: Thursday, January 30, 2014 10:15:56 AM
Subject: [Pacemaker] Running remote SSH commands on another server?

Hello,

I am coming up short in my searches, but I don't know exactly what I am searching for, hoping someone could point me in the right direction.

I have Pacemaker setup in active/passive on my Email server. The systems are in sync using DRBD.

When there is a failure on node-1, everything fails over to node-2 and vice versa. Everything actually works great. 

I have the mail servers sitting behind a proxy, which is also the MTA. The problem is, whenever the mailstores failover, there is a persistent connection going from the Proxy -> Mailstore that breaks, and any incoming/outgoing mail cannot be delivered even though the email server is back up. To fix this, I need to SSH into the proxy and restart the proxy services to re-establish that persistent connection. 

Is there any way to include this as part of the failover in PaceMaker?

Something like:

<**Failure occured on mail-1**>
mount DRBD resources on mail-2
Assign the failover-ip to mail-2
Start the email server on mail-2
SSH into the proxy and restart the proxy service (From mail-2 using keys)

I am researching ways within the application itself to fix this problem, but no luck yet. 

Thanks for any help,

Mike


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