Matthew O'Riordan created CASSANDRA-8022:
--------------------------------------------
Summary: cqlsh hangs indefinitely within a Docker container
connecting to itself with hostname
Key: CASSANDRA-8022
URL: https://issues.apache.org/jira/browse/CASSANDRA-8022
Project: Cassandra
Issue Type: Bug
Components: Tools
Environment: Ubuntu 14.04, running Docker, run inside a Ubuntu 14.04
container.
Reporter: Matthew O'Riordan
Fix For: 2.1.0
I am unable to use the `cqlsh` tool within a Docker container running
Cassandra. Previously I would use the Java & Thrift based `cqlsh` tool as
follows:
```
cqlsh --username cassandra --password whatever $(hostname)
```
When I run the `cqlsh` command after attaching to a running container (I use
LXC containerisation that allows attaching to a running container and running a
console), it simply hangs and never reports an error. With the `--debug` flag
on, I get the following with:
**cqlsh 4.1.1**
```
$ cqlsh --debug --username cassandra --password obfuscated $(hostname)
Using CQL driver: <module 'cql' from
'/usr/share/cassandra/lib/cql-internal-only-1.4.1.zip/cql-1.4.1/cql/__init__.py'>
Using thrift lib: <module 'thrift' from
'/usr/share/cassandra/lib/thrift-python-internal-only-0.9.1.zip/thrift/__init__.py'>
```
It then hangs in this state indefinitely, I have no errors from `cqlsh` and no
errors in the Cassandra log.
**cqlsh 5.0.1**
```
$ cqlsh --debug --username cassandra --passwor obfuscated $(hostname)
Using CQL driver: <module 'cassandra' from
'/usr/share/cassandra/lib/cassandra-driver-internal-only-2.1.0.post.zip/cassandra-driver-2.1.0.post/cassandra/__init__.py'>
```
It then also hangs in this state indefinitely, I have no errors from `cqlsh`
and no errors in the Cassandra log.
What's interesting, and quite confusing is that:
* I can telnet within the container as follows `telnet $(hostname) 9042` and I
get a socket. When trying to issue some commands, I see Protocol errors in the
Cassandra log thus verifying that the port is indeed open on the host that
resolves from $(hostname)
* If I `cqlsh` from another container or another host to the Cassandra
container it works just fine.
* I have tried disabling authentication altogether and using the
AllowAllAuthenticator, and I experience the same problem.
* `nodetool` works fine
In the mean time, I am forced to `cqlsh` from another container as a
workaround. Happy to try and do anything require to diagnose the cause of this
problem.
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