On 07/03/2015 11:58 AM, Krishnan Parthasarathi wrote: > > > ----- Original Message ----- >> >> This is caused because when bind-insecure is turned on (which is the default >> now), it may happen >> that brick is not able to bind to port assigned by Glusterd for example >> 49192-49195... >> It seems to occur because the rpc_clnt connections are binding to ports in >> the same range. >> so brick fails to bind to a port which is already used by someone else. >> >> This bug already exist before http://review.gluster.org/#/c/11039/ when use >> rdma, i.e. even >> previously rdma binds to port >= 1024 if it cannot find a free port < 1024, >> even when bind insecure was turned off (ref to commit '0e3fd04e'). >> Since we don't have tests related to rdma we did not discover this issue >> previously. >> >> http://review.gluster.org/#/c/11039/ discovers the bug we encountered, >> however now the bug can be fixed by >> http://review.gluster.org/#/c/11512/ by making rpc_clnt to get port numbers >> from 65535 in a descending >> order, as a result port clash is minimized, also it fixes issues in rdma too > > This approach could still surprise the storage-admin when glusterfs(d) > processes > bind to ports in the range where brick ports are being assigned. We should > make this > predictable by reserving brick ports setting net.ipv4.ip_local_reserved_ports. > Initially reserve 50 ports starting at 49152. Subsequently, we could reserve > ports on demand, > say 50 more ports, when we exhaust previously reserved range. > net.ipv4.ip_local_reserved_ports > doesn't interfere with explicit port allocation behaviour. i.e if the socket > uses > a port other than zero. With this option we don't have to manage ports > assignment at a process > level. Thoughts? If the reallocation can be done on demand, I do think this is a better approach to tackle this problem. > > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@gluster.org > http://www.gluster.org/mailman/listinfo/gluster-devel >
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