Cassandra cqlsh - connection refused

Question

I ve just started working with Cassandra  datastax   version 2 1 3 and cqlsh version 5 0 1   Cassandra starts up fine and the cluster is operational instantly   Cqlsh is not working  on any of the nodes  and emits the following error      Connection error    Unable to connect to any servers     127 0 0 1   error 111     Tried connecting to    127 0 0 1   9042    Last error  Connection refused       I have tried starting cqlsh up with the hosts own ip  other hosts ip  different ports yet the result remains the same - always connection refused

User · Answer

It is a good idea to check the cassandra log if even the server is running. I was getting exactly the same message and unable to do anything with that and then I found out that there are errors in the log and the system is actually not working.

Silly, I know, but could happen...

User · Answer

When I installed Cassandra 3 11 1  I came across this problem  I checked the  var log cassandra cassandra log and found this error Exception encountered during startup    It is a bug and already reported  The original post link https   issues apache org jira browse CASSANDRA-14173   The solution is to downgrade Cassandra to 3 0   download Cassandra rpm      curl -O   https   www apache org dist cassandra redhat 30x cassandra-3 0 15-1 noarch rpm   or     wget   https   www apache org dist cassandra redhat 30x cassandra-3 0 15-1 noarch rpm    rpm -ivh  cassandra-3 0 15-1 noarch rpm service cassandra start service cassandra status   check cassandra status       cassandra  pid  2322  is running       cqlsh   start cassandra

User · Answer

The first and foremost step to diagnose is to check the Cassandra logs   Find out the process and there will be hints in the command line parameters to tell you where the logs files are   ps aux   grep cassandra   In my case  it was in default location  etc cassandra conf cassandra yaml  if you installed the yum package    Make sure three things are configured and configured the same host ip    listen address - you may leave it blank it will default to hostname first IP binding with eth0 network card rpc address - this is optional  leave blank if you want it to be same as listen address seeds - this is a double quoted string of comma-separated list of IP addresses or hostnames  This was default to a hardcoded  127 0 0 1   changing it to the same as list address and restart of Cassandra service made it work for me    References    https   stackoverflow com a 42507530 416394 https   docs datastax com en dse 5 1 dse-admin datastax enterprise config configCassandra yaml html configCassandra yaml  seed provider

User · Answer

Try to telnet to the given address   In my case  there was a firewall in place blocking me

User · Answer

You need to edit cassandra yaml on the node you are trying to connect to and set the node ip address for rpc address and listen address and restart Cassandra   rpc address is the address on which Cassandra listens to the client calls   listen address is the address on which Cassandra listens to the other Cassandra nodes

User · Answer

Had same problem recently after downgrade from Cassandra 3 0 to Cassandra 2 2 on ArchLinux    Unlike above solutions my problem wasn t in  cassandra  but version 3 0 left its configuration in  var lib cassandra directory    Following commands solved my problem   sudo rm -R  var lib cassandra sudo rm -R  var log cassandra sudo rm -R  usr share cassandra   Then i installed cassandra and everything worked again

User · Answer

First  you need to check the port 9042 whether this open or not if open then check below things like rpc address and listen address  you should set the server own IP address instead 0 0 0 0 or 127 0 0 1   If all okay then please run below command to connect cqlsh   cqlsh IP address 9042  If you enable authentication and authorization you have to put user pass with this command

User · Answer

Make sure that you also set  seeds  to the address which you provided at  listen address

User · Answer

I was experiencing the same issue with Cassandra 3 11 0  anytime I changed the address of rpc or listen address cqlsh wouldn t work  I had to add the same local ip to seeds  So after much trial and error my working cassandra yml ended up like this   class-name  org apache cassandra locator SimpleSeedProvider parameters       -seeds   192 168 0 30   listen adress  192 168 0 30 rpc address  192 168 0 30

User · Answer

Got into this issue for  cqlsh 5 0 1   Cassandra 3 11 4   CQL spec 3 4 4   Native protocol v4  had to set start native transport  true in  cassandra yaml file   For verification     try opening tailf  var log cassandra system log file in one-tab  update cassandra yaml  restart cassandra sudo service cassandra restart   In logfile is shows   INFO   main  2019-03-15 19 53 06 156 Server java 156 - Starting listening for CQL clients on  10 139 45 34 9042  unencrypted

User · Answer

If you check the system log file for cassandra in  var log cassandra  you will see that this problem occurs because the rpc server has not started    By default  the start rpc is set to false in the cassandra yaml file  Set it to start rpc  true and then try again   From Cassandra 3 0 onwards  start rpc is set to true by default  https   docs datastax com en cassandra 3 0 cassandra configuration configCassandra yaml html

User · Answer

I was trying to run it on a network drive  So I increased the client timeout in cqlsh and it worked

User · Answer

Check for correct IP address in the cassandra yaml file  Majority of times the error is due to incorrect IP address of your system also the username and password too   After doing so initiate cqlsh by the command  -     cqlsh 10 31 79 1 -u cassandra -p cassandra

User · Answer

For me it turned out that the service wasn t running at all   Check with   service cassandra status   If you got the same error as I got  or another type  then messing around with IP addresses won t solve your problem at all   The error I got   cassandra dead but pid file exists   Edit  This was the solution for my problem  https   stackoverflow com a 46743119 3881406

User · Answer

try changing the native transport protocol to port 9160  if it is set to anything other than 9160  it might be pointing to 9042   Check your logs and see on which port cassandra is listening for CQL clients

User · Answer

Try to change the rpc address to point to the node s IP instead of 0 0 0 0 and specify the IP while connecting to the cqlsh  as if the IP is 10 0 1 34 and the rpc port left to the default value 9160 then the following should work    cqlsh 10 0 1 34 9160    Or   cqlsh 10 0 1 34    Also make sure that start rpc is set to true in  etc cassandra cassandra yaml configuration file

User · Answer

Try to change the rpc address to point to the node s IP instead of 0 0 0 0 and specify the IP while connecting to the cqlsh  as if the IP is 10 0 2 64 and the rpc port left to the default value 9160 then the following should work   cqlsh 10 0 2 64 9160    OR  cqlsh 10 0 2 64   Also make sure that start rpc is set to true in  etc cassandra cassandra yaml configuration file

User · Answer

This is because of some pre-configurations in the cassandra  And to fix this  there are following commented lines in the cassandra-env sh file     add this if you   re having trouble connecting   JVM OPTS   JVM OPTS -Djava rmi server hostname  lt public name gt     where you have to start fixing the error   Open the terminal and start fixing using the following easy steps   Step-1  use  sudo nano  etc cassandra cassandra-env sh  this command and search for JVM OPTS   JVM OPTS -Djava rmi server hostname  uncomment the line by simply removing   attached in the start of the line   NOTE  If you have never opened this file to fix this error then you will find JVM OPTS   JVM OPTS -Djava rmi server hostname  lt public name gt   Step-2 Now replace  lt public name gt  with 127 0 0 1   Step-3 Save the file and restart the cassandra using systemctl restart cassandra service  if you haven t the server is alredy running   OR start the cassandra using systemctl start cassandra service  if the server is not running    Step-4 Check the status either by using sudo service cassandra status or systemctl status cassandra service   Note  Once check the system monitor whether cassandra is running there or not   Try cqlsh now  It ll work   Note  nano is editor you can use other editors you are comfortable with

User · Answer

Look for native transport port in  etc cassandra cassandra yaml The default is 9842   native transport port  9842   For connecting to localhost with cqlsh  this port worked for me   cqlsh 127 0 0 1 9842

User · Answer

cqlsh --cqlversion  3 4 0  Connected to Test Cluster at 127 0 0 1 9042   cqlsh 5 0 1   Cassandra 3 0 9   CQL spec 3 4 0   Native protocol v4   try the above command  It works for me

[cassandra] Cassandra cqlsh - connection refused

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