Comments on: Installing Cassandra on Ubuntu Linux

By: Ricardo Bánffy

Ricardo Bánffy — Wed, 24 Mar 2010 14:49:59 +0000

Hi.

Just to note the correct apt URLs now are:

deb http://www.apache.org/dist/cassandra/debian unstable main
deb-src http://www.apache.org/dist/cassandra/debian unstable main

(I guess it’s because Cassandra graduated out of the incubator)

By: Nick

Nick — Thu, 18 Mar 2010 03:14:33 +0000

These instructions no longer work. The URLs that go in sources.list are now 404s. See http://wiki.apache.org/cassandra/DebianPackaging for updated instructions.

By: Robert Coli

Robert Coli — Wed, 17 Mar 2010 06:00:20 +0000

“Next you need to change Cassandra’s default port number from 8080 to something else, because the 8080 port typically conflicts with SSH terminal connections.”

This may lead people to believe that the default port that Cassandra listens for clients on is 8080. This is in fact the JMX interface port, which exposes metrics and some admin operations.

Per http://wiki.apache.org/cassandra/FAQ#ports
”
By default, Cassandra uses 7000 and 7001 for cluster communication, 9160 for clients (Thrift), 8888 for java remote debugging, and 8080 for JMX.
”

Clients, including the cassandra-cli client, should connect to 9160 in the default config.

=Rob

By: Marc d'Entremont

Marc d'Entremont — Wed, 17 Mar 2010 02:03:31 +0000

Regarding the previous posting about permission denied to the log files: I removed the files and they automatically regenerated correctly

By: Marc d'Entremont

Marc d'Entremont — Tue, 16 Mar 2010 03:46:50 +0000

I get a permission denied on the logs, but when I look at the log files they are owned by root. The /etc/init.d/cassandra start starts the app as root, so I’m bit confuses as to how this could happen. I’m using java-6-openjdk and have the $JAVA_HOME set to the directory that holds the javac executable, i.e. echo $JAVA_HOME yielded /usr/lib/jvm/java-6-openjdk/bin/

The error message quite massive, but the first couple of lines seem to say it all log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: /var/log/cassandra/system.log (Permission denied)

and

/var/log/cassandra$ ls -al
total 20
drwxr-xr-x 2 root root 4096 2010-03-15 19:16 .
drwxr-xr-x 15 root root 4096 2010-03-15 20:36 ..
-rw——- 1 root root 2215 2010-03-15 20:37 output.log
-rw——- 1 root root 4537 2010-03-15 20:37 system.log

I’ve also tried adding right to the root group to be able to read and write, but luck

Any thoughts?

By: Jauder Ho

Jauder Ho — Tue, 02 Mar 2010 07:53:30 +0000

You should consider putting the deb stanzas in a file like /etc/apt/sources.list.d/cassandra.list instead of sources.list

Trying to connect to the instance via the CLI results in an exception though. Investigating.

BTW the 0.5.0 binary is now available via deb.

By: Mike Limon

Mike Limon — Thu, 18 Feb 2010 05:07:10 +0000

I also got the “Cannot locate Java Home” message. I saw that the init script had the JAVA_HOME hardcoded to /usr/lib/jvm/java-6-openjdk so I simply made a symlink:

sudo ln -s /usr/lib/jvm/java-6-sun /usr/lib/jvm/java-6-openjdk

By: Mike Limon

Mike Limon — Thu, 18 Feb 2010 05:06:18 +0000

I also got the “Cannot locate Java Home” message. I saw that the inti script had the JAVA_HOME hardcoded to /usr/lib/jvm/java-6-openjdk so I simply made a symlink:

sudo ln -s /usr/lib/jvm/java-6-sun /
/usr/lib/jvm/java-6-openjdk

By: userfriendly

userfriendly — Sat, 16 Jan 2010 02:45:43 +0000

I’ve tried following this how-to on a machine with Ubuntu 9.10, and despite having JAVA_HOME correctly set (and yes, I’m quite sure of that), the Cassandra installed by the 0.4.2 Debian package kept insisting that it “Cannot locate Java Home”.

Without changing anything else, I went and downloaded the 0.5.0-rc3 binary from the apache incubator website instead which, surprisingly enough, worked just fine – though I do hate bypassing the package manager. <.<