Z W wrote:
Hi
I'm trying to "ping" hosts on network using <isreachable> with ant-contrib.
All these hosts variables point to the same host ie linpac2.
[echo] start isreachable linpac2
Dynamically discovered 'isreachable'
[EMAIL PROTECTED]
Probing host linpac2
Unknown host: linpac2
Condition false; not setting offline
[echo] build_main.debug=0
[sleep] sleeping for 5000 milliseconds
Why on both consecutive "pinging" to the same host, it works the first time
but not the second ?
I'm the author of that task, so blame me.
Here's the source
http://svn.apache.org/viewvc/ant/core/trunk/src/main/org/apache/tools/ant/taskdefs/condition/IsReachable.java?view=markup
-isreachable uses Sun's API InetAddress.isReachable() , the exact
behaviour of which is undocumented (they dont say how it pings)
If its playing up, its probably the implementation. I see that java 6.4
mentions three fixes for this
6587875 java classes_net InetAddress.isReachable() will not work for
super users with "large" process ids
6599750 java classes_net InetAddress.isReachable implementation not
completely thread safe
6601686 java classes_net InetAddress.isReachable(timeout) may not
return after timout milliseconds
1. please open a bugrep on issues.apache.org/bugzilla
2. try with the latest sun JVM update; if it goes away, then we've found
the problem
I've found I dont use the condition much, because
-some of the hosts I deploy to have ping locked down
-it doesnt go through firewalls
-when a machine is booting up, ping starts ahead of the services I need
I prefer to use <http> and <socket>. Could they work for you ?
--
Steve Loughran http://www.1060.org/blogxter/publish/5
Author: Ant in Action http://antbook.org/
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