Hi Matthias,<br><br>The node on Ubuntu is using an older version of erlang (13.b). After i upgrade the erlang to the latest version (15b.1), which is used by the nodes on windows, the node on ubuntu can be added to the cluster.<br><br>Great thanks for your help! <br><br>On Monday, May 21, 2012 3:13:09 PM UTC+8, Rader Lei wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">i have a cluster of 3 rabbimtmq servers on windows 2008 and 2003. they works fine. Then I set up a rabbitmq server on Ubuntu 11. when i try to add the new rabbitmq node into the cluster, i get an error - "unable to join the cluster". The log file looks fine, no error message. I can access the cluster master node with command "rabbitmqctl -n rabbit@CNCDS131 status". I have no idea why this error happen:( <br><br><br>Here is the error:<br><blockquote>leid@yud-vm:~$ sudo rabbitmqctl cluster rabbit@CNCDS131<br>Clustering node 'rabbit@yud-vm' with [rabbit@CNCDS131] ...<br>Error: {<span style="background-color:rgb(255,0,0)">unable_to_join_cluster</span>,<br> [rabbit@CNCDS131],<br> {aborted,<br> {function_clause,<br> [{mnesia_schema,cs2list,<br> [{cstruct,schema,set,<br> [rabbit@STARS110,rabbit@<wbr>CNCDS108],<br> [rabbit@CNCDS131],<br> [],0,read_write,false,[],[],<wbr>false,schema,<br> [table,cstruct],<br> [],[],[],<br> {{1336,728415,425002},rabbit@<wbr>CNCDS131},<br> {{24,0},<br> {rabbit@CNCDS131,{1337,582820,<wbr>591922}}}}]},<br> {mnesia_schema,do_merge_<wbr>schema,0},<br> {mnesia_tm,apply_fun,3},<br> {mnesia_tm,execute_<wbr>transaction,5},<br> {mnesia_schema,schema_<wbr>coordinator,3}]}}}<br></blockquote>Here is the log:<br><blockquote style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">=INFO REPORT==== 21-May-2012::15:08:16 ===<br>Clustering with [rabbit@CNCDS131]<br><br>=INFO REPORT==== 21-May-2012::15:08:16 ===<br> application: mnesia<br> exited: stopped<br> type: temporary<br></blockquote><br></blockquote>