Uses a Syslog source, memory channel, and Avro sink in Apache Flume to ingest log data.
Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data. It has a simple and flexible architecture based on streaming data flows. It is robust and fault tolerant with tunable reliability mechanisms and many failover and recovery mechanisms. It uses a simple extensible data model that allows for online analytic application. Learn more at flume.apache.org.
This charm provides a Flume agent designed to receive remote syslog events and
send them to the
apache-flume-hdfs agent for storage into the shared
filesystem (HDFS) of a connected Hadoop cluster. Think of this charm as a
rsyslog, sending syslog events to HDFS instead of writing
them to a local filesystem.
This charm is uses the Hadoob base layer and the HDFS interface to pull its dependencies and act as a client to a Hadoop namenode:
You may manually deploy the recommended environment as follows:
juju deploy apache-hadoop-namenode namenode juju deploy apache-hadoop-resourcemanager resourcemgr juju deploy apache-hadoop-slave slave juju deploy apache-hadoop-plugin plugin juju add-relation namenode slave juju add-relation resourcemgr slave juju add-relation resourcemgr namenode juju add-relation plugin resourcemgr juju add-relation plugin namenode
Deploy Flume hdfs:
juju deploy apache-flume-hdfs flume-hdfs juju add-relation flume-hdfs plugin
Now that the base environment has been deployed (either via quickstart or
manually), you are ready to add the
apache-flume-syslog charm and
relate it to the
juju deploy apache-flume-syslog flume-syslog juju add-relation flume-syslog flume-hdfs
You are now ready to ingest remote syslog events! Note the deployment at this
stage isn't very useful. You'll need to relate this charm to any other service
that is configured to send data via the
As an example use case, let's ingest our
hdfs-master syslog events into HDFS.
rsyslog-forwarder-ha subordinate charm, relate it to
hdfs-master, and then link the
juju deploy rsyslog-forwarder-ha juju add-relation rsyslog-forwarder-ha namenode juju add-relation rsyslog-forwarder-ha flume-syslog
Any syslog data generated on the
namenode unit will now be ingested into
HDFS via the
flume-hdfs charms. Flume may include multiple
syslog events in each file written to HDFS. This is configurable with various
options on the
flume-hdfs charm. See descriptions of the
roll_* options on
the apache-flume-hdfs charm store
page for more details.
Flume will write files to HDFS in the following location:
subdirectory is configurable and set to
flume-syslog by default for this
Test the deployment
To verify this charm is working as intended, trigger a syslog event on the
monitored unit (
hdfs-master in our deployment scenario):
juju ssh namenode/0 'echo flume-test'
Now SSH to the
flume-hdfs unit, locate an event, and cat it:
juju ssh flume-hdfs/0 hdfs dfs -ls /user/flume/<event_dir> # <-- find a date hdfs dfs -ls /user/flume/<event_dir>/<yyyy-mm-dd> # <-- find an event hdfs dfs -cat /user/flume/<event_dir>/<yyyy-mm-dd>/FlumeData.<id>
You should be able to find a timestamped message about SSH'ing into the
namenode unit that corresponds to the trigger you issued above. Note that
this workload isn't limited to ssh-related events. You'll get every syslog
event from the
namenode unit. Happy logging!
- (string) The maximum number of events stored in the channel.
- (string) The maximum number of events the channel will take from a source or give to a sink per transaction.
- (string) The HDFS subdirectory under /user/flume where events will be stored.
- (string) URL from which to fetch resources (e.g., Flume binaries) instead of S3
- (string) Port on which the agent source is listening. If relating to the 'rsyslog-forwarder-ha' charm, this must be '514'.
- (string) Agent source type. Can be 'syslogudp' or 'syslogtcp'. If relating to the 'rsyslog-forwarder-ha' charm, this must be 'syslogudp'.