Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
You are welcome Martjin! Glad to have been able to help ( Best, -Razi On 4/13/17, 12:13 PM, "Martijn Pieters" wrote: On 13/04/2017, 15:06, "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" wrote: > Looking at your original message: https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mail-2Darchive.com_user-40cassandra.apache.org_msg51736.html&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=xmrhtBIDZ_UcilJaq1SH8Q&m=pRFNVjsQoNpE4xWTky8s9kt-twcOChSSvnvSDW6jrfc&s=R0lHgyuqfgHkYPRDYmCpEWN1Q02x5moqZa25mRLdJ80&e= > > I see you edited etc/cassandra/cassandra-env.sh, by changing: > > >+#JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" > >+JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv6Addresses=true" > > First, I don’t think there is an option java.net.preferIPv6Addresses, so I would recommend removing that line. The option does exist, see https://docs.oracle.com/javase/8/docs/api/java/net/doc-files/net-properties.html. I had tried both with and without the IPv6 option. > Second, I believe that starting in apache-cassandra-3.2, that enabling/disabling the option has been moved to a file called *jvm.options* [snip evidence of the option moving] > My guess right now is that you may have upgraded Cassandra from a version older that 3.1 and somehow your config files are not compatible with 3.10? **BINGO**. Indeed, I had at some point downgraded to a different Cassandra version in an attempt to resolve issues with `cqlsh` (which hardcodes a CQL version). As a result the option was being applied **twice**, in /etc/cassandra/cassandra-env.sh and via /etc/cassandra/jvm.options. Removing the switch from both locations now lets Cassandra bind to IPv6. I now can finally drop the SSH tunnel forwarding the port in my test cluster. Thanks!
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
On 13/04/2017, 15:06, "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" wrote: > Looking at your original message: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mail-2Darchive.com_user-40cassandra.apache.org_msg51736.html&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=xmrhtBIDZ_UcilJaq1SH8Q&m=pRFNVjsQoNpE4xWTky8s9kt-twcOChSSvnvSDW6jrfc&s=R0lHgyuqfgHkYPRDYmCpEWN1Q02x5moqZa25mRLdJ80&e= > > > I see you edited etc/cassandra/cassandra-env.sh, by changing: > > >+#JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" > >+JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv6Addresses=true" > > First, I don’t think there is an option java.net.preferIPv6Addresses, so I > would recommend removing that line. The option does exist, see https://docs.oracle.com/javase/8/docs/api/java/net/doc-files/net-properties.html. I had tried both with and without the IPv6 option. > Second, I believe that starting in apache-cassandra-3.2, that > enabling/disabling the option has been moved to a file called *jvm.options* [snip evidence of the option moving] > My guess right now is that you may have upgraded Cassandra from a version > older that 3.1 and somehow your config files are not compatible with 3.10? **BINGO**. Indeed, I had at some point downgraded to a different Cassandra version in an attempt to resolve issues with `cqlsh` (which hardcodes a CQL version). As a result the option was being applied **twice**, in /etc/cassandra/cassandra-env.sh and via /etc/cassandra/jvm.options. Removing the switch from both locations now lets Cassandra bind to IPv6. I now can finally drop the SSH tunnel forwarding the port in my test cluster. Thanks!
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
Hi Martjin, Looking at your original message: http://www.mail-archive.com/user@cassandra.apache.org/msg51736.html I see you edited etc/cassandra/cassandra-env.sh, by changing: +#JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" +JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv6Addresses=true" First, I don’t think there is an option java.net.preferIPv6Addresses, so I would recommend removing that line. Second, I believe that starting in apache-cassandra-3.2, that enabling/disabling the option has been moved to a file called *jvm.options* ./2.1.16/apache-cassandra-2.1.16/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./2.2.4/apache-cassandra-2.2.4/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./2.2.5/apache-cassandra-2.2.5/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./2.2.6/apache-cassandra-2.2.6/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./2.2.7/apache-cassandra-2.2.7/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.0/apache-cassandra-3.0.0/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.1/apache-cassandra-3.0.1/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.2/apache-cassandra-3.0.2/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.3/apache-cassandra-3.0.3/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.4/apache-cassandra-3.0.4/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.5/apache-cassandra-3.0.5/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.6/apache-cassandra-3.0.6/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.7/apache-cassandra-3.0.7/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.8/apache-cassandra-3.0.8/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.0.9/apache-cassandra-3.0.9/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.1/apache-cassandra-3.1/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.1.1/apache-cassandra-3.1.1/conf/cassandra-env.sh:JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" ./3.2/apache-cassandra-3.2/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.2.1/apache-cassandra-3.2.1/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.3/apache-cassandra-3.3/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.4/apache-cassandra-3.4/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.5/apache-cassandra-3.5/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.6/apache-cassandra-3.6/conf/jvm.options:-Djava.net.preferIPv4Stack=true ./3.7/apache-cassandra-3.7/conf/jvm.options:-Djava.net.preferIPv4Stack=true My guess right now is that you may have upgraded Cassandra from a version older that 3.1 and somehow your config files are not compatible with 3.10? -Razi On 4/13/17, 5:41 AM, "Martijn Pieters" wrote: From my original email: http://www.mail-archive.com/user@cassandra.apache.org/msg51736.html: > My configuration changes: > > listen_address: > listen_interface_prefer_ipv6: true listen_interface is commented out. I've just now tried again with "# listen_interface_prefer_ipv6: false" (option commented out), but the error persists. I've also rebooted the system, in case the upgrade from base 16.04 to 16.04.2 left something in a funky state. On 12/04/2017, 21:39, "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" wrote: Are you specifying both the listen_address and listen_interface, or just one of the two? Send, an example of the following 3 lines. Here is what I have on my 2.1.16 cluster that uses ipv6: listen_address: ::hhh::h::hhh:h # listen_interface: eth0 # listen_interface_prefer_ipv6: false Also, looking at my config, I can confirm that it is uneccessary or wrong to escape the ipv6 address with \ as I suggested before. -Razi On 4/12/17, 4:05 PM, "Martijn Pieters" wrote: From: "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" > Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the same way. > I think it’s worth a try. Nope, no luck. You get an error instead: ERROR [main] 2017-04-12 20:03:46,899 CassandraDaemon.java:752 - Exception encountered during startup: Unknown listen_address '\:\:\:\:\:h\:hh\:h' (actual address digits replaced with h characters). Martijn
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
From my original email: http://www.mail-archive.com/user@cassandra.apache.org/msg51736.html: > My configuration changes: > > listen_address: > listen_interface_prefer_ipv6: true listen_interface is commented out. I've just now tried again with "# listen_interface_prefer_ipv6: false" (option commented out), but the error persists. I've also rebooted the system, in case the upgrade from base 16.04 to 16.04.2 left something in a funky state. On 12/04/2017, 21:39, "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" wrote: Are you specifying both the listen_address and listen_interface, or just one of the two? Send, an example of the following 3 lines. Here is what I have on my 2.1.16 cluster that uses ipv6: listen_address: ::hhh::h::hhh:h # listen_interface: eth0 # listen_interface_prefer_ipv6: false Also, looking at my config, I can confirm that it is uneccessary or wrong to escape the ipv6 address with \ as I suggested before. -Razi On 4/12/17, 4:05 PM, "Martijn Pieters" wrote: From: "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" > Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the same way. > I think it’s worth a try. Nope, no luck. You get an error instead: ERROR [main] 2017-04-12 20:03:46,899 CassandraDaemon.java:752 - Exception encountered during startup: Unknown listen_address '\:\:\:\:\:h\:hh\:h' (actual address digits replaced with h characters). Martijn
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
Are you specifying both the listen_address and listen_interface, or just one of the two? Send, an example of the following 3 lines. Here is what I have on my 2.1.16 cluster that uses ipv6: listen_address: ::hhh::h::hhh:h # listen_interface: eth0 # listen_interface_prefer_ipv6: false Also, looking at my config, I can confirm that it is uneccessary or wrong to escape the ipv6 address with \ as I suggested before. -Razi On 4/12/17, 4:05 PM, "Martijn Pieters" wrote: From: "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" > Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the same way. > I think it’s worth a try. Nope, no luck. You get an error instead: ERROR [main] 2017-04-12 20:03:46,899 CassandraDaemon.java:752 - Exception encountered during startup: Unknown listen_address '\:\:\:\:\:h\:hh\:h' (actual address digits replaced with h characters). Martijn
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
From: "Khaja, Raziuddin (NIH/NLM/NCBI) [C]" > Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the same > way. > I think it’s worth a try. Nope, no luck. You get an error instead: ERROR [main] 2017-04-12 20:03:46,899 CassandraDaemon.java:752 - Exception encountered during startup: Unknown listen_address '\:\:\:\:\:h\:hh\:h' (actual address digits replaced with h characters). Martijn
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
See this note in cassandra-topology.properties: # Native IPv6 is supported, however you must escape the colon in the IPv6 Address # Also be sure to comment out JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" # in cassandra-env.sh fe80\:0\:0\:0\:202\:b3ff\:fe1e\:8329=DC1:RAC3 Maybe you have to escape the IPV6 addresses in the cassandra.yaml in the same way. I think it’s worth a try. -Razi On 4/12/17, 3:08 PM, "Martijn Pieters" wrote: From: sai krishnam raju potturi > We have included the IPV6 address with scope GLOBAL, and not IPV6 with SCOPE LINK in the YAML and TOPOLOGY files. > > inet6 addr: 2001: *** : ** : ** : * : * : : Scope:Global > inet6 addr: fe80 :: *** : : : Scope:Link > > Not sure if this might be of relevance to the issue you are facing. I already stated I tried both the initial email. Martijn Pieters
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
From: sai krishnam raju potturi > We have included the IPV6 address with scope GLOBAL, and not IPV6 with SCOPE > LINK in the YAML and TOPOLOGY files. > > inet6 addr: 2001: *** : ** : ** : * : * : : Scope:Global > inet6 addr: fe80 :: *** : : : Scope:Link > > Not sure if this might be of relevance to the issue you are facing. I already stated I tried both the initial email. Martijn Pieters
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
We have included the IPV6 address with scope GLOBAL, and not IPV6 with SCOPE LINK in the YAML and TOPOLOGY files. inet6 addr: 2001: *** : ** : ** : * : * : : Scope:Global inet6 addr: fe80 :: *** : : : Scope:Link Not sure if this might be of relevance to the issue you are facing. thanks Sai On Tue, Apr 11, 2017 at 10:29 AM, Martijn Pieters wrote: > From: sai krishnam raju potturi > > I got a similar error, and commenting out the below line helped. > > JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" > > > > Did you also include "rpc_interface_prefer_ipv6: true" in the YAML file? > > No luck at all here. Yes, I had commented out that line (and also tried > replacing it with `-Djava.net.preferIPv6Addresses=true`, included in my > email. I also included an error to make sure it was the right file). > > It all *should* work, but doesn’t. :-( > > I just tried again with “rpc_interface_prefer_ipv6: true” set as well, but > without luck. I note that I have the default “rpc_address: localhost”, so > it’ll bind to the lo loopback, which has IPv4 configured already. Not that > using “rpc_address: ‘::1’” instead works (same error, so I can’t bind to > the IPv6 localhost address either). > > Martijn Pieters > > > > >
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
From: sai krishnam raju potturi > I got a similar error, and commenting out the below line helped. > JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" > > Did you also include "rpc_interface_prefer_ipv6: true" in the YAML file? No luck at all here. Yes, I had commented out that line (and also tried replacing it with `-Djava.net.preferIPv6Addresses=true`, included in my email. I also included an error to make sure it was the right file). It all *should* work, but doesn’t. :-( I just tried again with “rpc_interface_prefer_ipv6: true” set as well, but without luck. I note that I have the default “rpc_address: localhost”, so it’ll bind to the lo loopback, which has IPv4 configured already. Not that using “rpc_address: ‘::1’” instead works (same error, so I can’t bind to the IPv6 localhost address either). Martijn Pieters
Re: IPv6-only host, can't seem to get Cassandra to bind to a public port
I got a similar error, and commenting out the below line helped. JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" Did you also include "rpc_interface_prefer_ipv6: true" in the YAML file? thanks Sai On Tue, Apr 11, 2017 at 6:37 AM, Martijn Pieters wrote: > I’m having issues getting a single-node Cassandra cluster to run on a > Ubuntu 16.04 VM with only IPv6 available. I’m running Oracle Java 8 > (8u121-1~webupd8~2), Cassandra 3.10 (installed via the Cassandra > http://www.apache.org/dist/cassandra/debian packages.) > > > > I consistently get a “Protocol family unavailable” exception: > > > > ERROR [main] 2017-04-11 09:54:23,991 CassandraDaemon.java:752 - Exception > encountered during startup > > java.lang.RuntimeException: java.net.SocketException: Protocol family > unavailable > > at > org.apache.cassandra.net.MessagingService.getServerSockets(MessagingService.java:730) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.net.MessagingService.listen(MessagingService.java:664) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.net.MessagingService.listen(MessagingService.java:648) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:773) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.StorageService.initServer(StorageService.java:666) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.StorageService.initServer(StorageService.java:612) > ~[apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:394) > [apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:601) > [apache-cassandra-3.10.jar:3.10] > > at > org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:735) > [apache-cassandra-3.10.jar:3.10] > > Caused by: java.net.SocketException: Protocol family unavailable > > at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_121] > > at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_121] > > at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_121] > > at > sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) > ~[na:1.8.0_121] > > at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) > ~[na:1.8.0_121] > > at > org.apache.cassandra.net.MessagingService.getServerSockets(MessagingService.java:714) > ~[apache-cassandra-3.10.jar:3.10] > > ... 8 common frames omitted > > > > `lo` (loopback) has both `inet` and `inet6` addresses, but `eth0` has no > `inet` addresses, so only inet6 addr entries (both a local and a global > scope address are configured). > > > > My configuration changes: > > > > listen_address: > > listen_interface_prefer_ipv6: true > > > > Tracing through the source code the exception shows that it is the > listen_address value above that throws the exception, changing it back to > 127.0.0.1 makes the server work again (but then I don’t get to use it on my > local network). I tried both the local and the global scope IPv6 address. > > > > I tried changing the JVM configuration to prefer IPv6 by editing > /etc/cassandra/cassandra-env.sh: > > > > --- etc/cassandra/cassandra-env.sh 2017-01-31 16:29:32.0 > + > > +++ /etc/cassandra/cassandra-env.sh 2017-04-11 09:52:51.45600 > + > > @@ -290,6 +290,9 @@ > > # to the location of the native libraries. > > JVM_OPTS="$JVM_OPTS -Djava.library.path=$CASSANDRA_HOME/lib/sigar-bin" > > > > +#JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" > > +JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv6Addresses=true" > > + > > JVM_OPTS="$JVM_OPTS $MX4J_ADDRESS" > > JVM_OPTS="$JVM_OPTS $MX4J_PORT" > > JVM_OPTS="$JVM_OPTS $JVM_EXTRA_OPTS" > > > > But this makes no difference > > > > I also tried using `listen_interface` instead, but that only changes the > error message to: > > > > ERROR [main] 2017-04-11 10:35:16,426 CassandraDaemon.java:752 - > Exception encountered during startup: Configured listen_interface "eth0" > could not be found > > > > What else can I do? > > > > Martijn Pieters >
IPv6-only host, can't seem to get Cassandra to bind to a public port
I’m having issues getting a single-node Cassandra cluster to run on a Ubuntu 16.04 VM with only IPv6 available. I’m running Oracle Java 8 (8u121-1~webupd8~2), Cassandra 3.10 (installed via the Cassandra http://www.apache.org/dist/cassandra/debian packages.) I consistently get a “Protocol family unavailable” exception: ERROR [main] 2017-04-11 09:54:23,991 CassandraDaemon.java:752 - Exception encountered during startup java.lang.RuntimeException: java.net.SocketException: Protocol family unavailable at org.apache.cassandra.net.MessagingService.getServerSockets(MessagingService.java:730) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.net.MessagingService.listen(MessagingService.java:664) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.net.MessagingService.listen(MessagingService.java:648) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:773) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.StorageService.initServer(StorageService.java:666) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.StorageService.initServer(StorageService.java:612) ~[apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:394) [apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:601) [apache-cassandra-3.10.jar:3.10] at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:735) [apache-cassandra-3.10.jar:3.10] Caused by: java.net.SocketException: Protocol family unavailable at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_121] at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_121] at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_121] at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_121] at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_121] at org.apache.cassandra.net.MessagingService.getServerSockets(MessagingService.java:714) ~[apache-cassandra-3.10.jar:3.10] ... 8 common frames omitted `lo` (loopback) has both `inet` and `inet6` addresses, but `eth0` has no `inet` addresses, so only inet6 addr entries (both a local and a global scope address are configured). My configuration changes: listen_address: listen_interface_prefer_ipv6: true Tracing through the source code the exception shows that it is the listen_address value above that throws the exception, changing it back to 127.0.0.1 makes the server work again (but then I don’t get to use it on my local network). I tried both the local and the global scope IPv6 address. I tried changing the JVM configuration to prefer IPv6 by editing /etc/cassandra/cassandra-env.sh: --- etc/cassandra/cassandra-env.sh 2017-01-31 16:29:32.0 + +++ /etc/cassandra/cassandra-env.sh 2017-04-11 09:52:51.45600 + @@ -290,6 +290,9 @@ # to the location of the native libraries. JVM_OPTS="$JVM_OPTS -Djava.library.path=$CASSANDRA_HOME/lib/sigar-bin" +#JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" +JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv6Addresses=true" + JVM_OPTS="$JVM_OPTS $MX4J_ADDRESS" JVM_OPTS="$JVM_OPTS $MX4J_PORT" JVM_OPTS="$JVM_OPTS $JVM_EXTRA_OPTS" But this makes no difference I also tried using `listen_interface` instead, but that only changes the error message to: ERROR [main] 2017-04-11 10:35:16,426 CassandraDaemon.java:752 - Exception encountered during startup: Configured listen_interface "eth0" could not be found What else can I do? Martijn Pieters