On 05/21/2012 03:55 AM, Tamar Fraenkel wrote:
Hi!
I am trying the tunnel and it fails. Will
be gratefull for
some hints:
I defined
- proxy_host =
ubuntu@my_ec2_cassandra_node_public_ip
- proxy_port = 22
I do:
ssh -N -f -i
/c/Users/tamar/.ssh/Amazon/tokey.openssh
-D22
ubuntu@my_ec2_cassandra_node_public_ip
I put some debug prints and I can see
that the ssh_pid is indeed the correct
one.
I run
jconsole
-J-DsocksProxyHost=localhost
-J-DsocksProxyPort=22
service:jmx:rmi:///jndi/rmi://my_ec2_cassandra_node_public_ip:7199/jmxrmi
I get errors and it fails:
channel 2:
open failed: connect failed: Connection
timed out
One note though, I can ssh to that vm
using
ssh -i
/c/Users/tamar/.ssh/Amazon/tokey.openssh
-D22
ubuntu@my_ec2_cassandra_node_public_ip
without being prompted for
PW.
Any help appreciated
Tamar Fraenkel
Senior Software Engineer, TOK Media
On Fri, May 18, 2012 at 9:49 PM,
ramesh
<dbgroup...@gmail.com>
wrote:
On 05/18/2012 01:35 PM, Tyler
Hobbs wrote:
Your firewall rules need to
allow TCP traffic on any port
>= 1024 for JMX to work. It
initially connects on port 7199,
but then the client is asked to
reconnect on a randomly chosen
port.
You can open the firewall, SSH to
the node first, or set up
something like this:
http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html
I updated the cassandra-env.sh
$JMX_HOST="10.20.30.40"
JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=$JMX_HOST"
netstat -ltn
shows port 7199 is
listening.
I tried both public and
private IP for connecting
but neither helps.
However, I am able to
connect locally from within
server.
I get this error when I
remote:
Error connection to
remote
JMX agent!
java.rmi.ConnectException:
Connection refused to host:
10.20.30.40; nested exception
is: java.net.ConnectException:
Connection timed out at
sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
at
sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
at
sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
at
sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
at
javax.management.remote.rmi.RMIServerImpl_Stub.newClient(Unknown
Source) at
javax.management.remote.rmi.RMIConnector.getConnection(RMIConnector.java:2329)
at
javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:279)
at
javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:248)
at
org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:144)
at
org.apache.cassandra.tools.NodeProbe.
(NodeProbe.java:114) at
org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:623)
Caused by:
java.net.ConnectException:
Connection timed out at
java.net.PlainSocketImpl.socketConnect(Native
Method) at
java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at
java.net.Socket.connect(Socket.java:529)
at
java.net.Socket.connect(Socket.java:478)
at java.net.Socket.
(Socket.java
:375)
at java.net.Socket.
(Socket.java
:189)
at
sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at
sun.rmi.transport
.tcp.TCPEndpoint
.newSocket(TCPEndpoint.java
:595)
... 10 more
Any help appreciated.
Regards
Ramesh
--
Tyler Hobbs
DataStax
It helped.
Thanks Tyler for the info and the link
to the post.
Regards
Ramesh
Hello Tamar,
In your bash file, where you ssh , pass the .pem as
well :
# start up a background ssh tunnel on the desired
port
ssh -i mypem.pem -N -f -D$proxy_port $proxy_host
Here is the entire code
---------------------------------------------------------------------------------------------------
#!/bin/bash
function jc {
# set this to the host you'll proxy through.
proxy_host=
"ubu...@ec2-xx-xx-xx-xx.compute-1.amazonaws.com"
host=$1
jmxport=7199 # as specified by JMX_PORT in
cassandra-env.sh
proxy_port=${2:-8123}
if [ "x$host" = "x" ]; then
echo "Usage: jc [proxy port]"
return 1
fi
# start up a background ssh tunnel on the desired
port
ssh -i
mypem.pem -N -f -D$proxy_port
$proxy_host
# if the tunnel failed to come up, fail
gracefully.
if [ $? -ne 0 ]; then
echo "Ssh tunnel failed"
return 1
fi
ssh_pid=`ps awwwx | grep "[s]sh -N -f
-D$proxy_port" | awk '{print $1}'`
echo "ssh pid = $ssh_pid"
# Fire up jconsole to your remote host
jconsole -J-DsocksProxyHost=localhost
-J-DsocksProxyPort=$proxy_port \
service:jmx:rmi:///jndi/rmi://${host}:${jmxport}/jmxrmi
# tear down the tunnel
kill $ssh_pid
}
