• http://github.com/tagomoris/fluent-agent-lite

'fluent-agent-lite' is a log transfer agent, for Fluentd's 'forward' input.

This agent reads specified files, and sends each lines to fluentd servers. One log line will be packed one fluentd message, that has one attribute ('message' or specified in configuration) with entire line (not terminated by newline).

0.9 http://tagomoris.github.io/tarballs/fluent-agent-lite.v0.9.tar.gz

On RHEL/CentOS, you can use .spec file to build rpm with your customized default config file.

To build your rpm package, do 5 steps below.

1. Download (newest version) tarball, and place it on SOURCES/ .
2. Download package/fluent-agent-lite.conf, and place it on SOURCES/ .
3. Fix SOURCES/package/fluent-agent-lite.conf as you want (ex: server name or servers list), and add servers list for your own.
4. Download SPECS/fluent-agent-lite.spec, and place it on SPECS/ .
5. run 'rpmbuild -ba SPECS/fluent-agent-lite.spec'

To install each RHEL/CentOS host, use yum server, or copy and rpm -i on each host.

NOTE: yum install perl-devel and QA_RPATHS=$[0x001] rpmbuild -ba may help you if rpmbuild fails on your build environment.

On each host, do steps below.

1. Download and extract tarball, or clone repository, and move into extracted directory.
2. Do 'bin/install.sh'.

All of configurations are written in configuration shell-script file (/etc/fluent-agent-lite.conf). Configurable values are below:

Pairs of tag and file, such as:

LOGS=$(cat <<"EOF"
www     /var/log/nginx/www_access.log
app     /var/log/apache2/app_access.log
EOF

Or, you can use this syntax:

LOGS=$(cat /etc/fluent-agent.logs)

## in fluent-agent.logs
www  /var/log/nginx/www_access.log
app  /var/log/apache2/app_access.log

Prefix of each tags, specified in 'LOGS'. 'TAG_PREFIX="service"' with 'LOGS' above, you will get fluentd messages with tags 'service.www' and 'service.app'.

Log line attribute name in fluentd message (default: 'message').

Fluentd server name and port (SERVERNAME:PORT), as primary server. 'fluent-agent-lite' try to connect to primary server at first, and if fails, then try to connect secondary server (if it specified).

Default port is 24224 (if omitted).

File path to specify primary(secondary) servers' list. 'fluent-agent-lite' reads this file when executed, and choose one of servers randomly at each connection trial.

You cannot specify both of 'PRIMARY_SERVER' and 'PRIMARY_SERVERS_LIST', and both of 'SECONDARY_SERVER' and 'SECONDARY_SERVERS_LIST'

Bytes size which 'fluent-agent-lite' try to read from 'tail' at once (Default: 1MB).

Nice value for 'fluent-agent-lite'. If you want to execute fluent-agent-lite in server with high loadavg, 'PROCESS_NICE="-1"' can help you.

Path of tail command (Default: /usr/bin/tail).

'sleep interval' of tail command in seconds (Default: 1.0). For high throughput log file, you can specify 'TAIL_INTERVAL="0.5"' or any other values (but over "0.1").

Caution: This cofiguration is for GNU tail only.

Ping message tag/data and emit interval specification. Without PING_TAG, fluent-agent-lite doesn't emit ping_messages.

Actual 'data' field of ping message is 'PING_DATA PATH_OF_INPUT_FILE'.

Tag name of drain_log (messages count per drain/send to server), which is emitted to configured fluentd sever as fluentd message. Default is none (not to send drain_log).

Connection keepalive time in seconds. 0 means infinity (Default: 1800, minimum: 120)

Log file path for 'fluent-agent-lite' (Default: /tmp/fluent-agent.log).

If you specify 'LOG_VERBOSE="yes"', 'fluent-agent-lite' writes logs with level info/debug (Default: warn/crit only).

With properly configured '/etc/fluent-agent-lite.conf', you can run and stop all transfer agent as below.

# /etc/init.d/fluent-agent-lite start
# /etc/init.d/fluent-agent-lite restart
# /etc/init.d/fluent-agent-lite stop

Check running processes:

# /etc/init.d/fluent-agent-lite status

And reset fluentd connections of each processes. (To re-connect primary server instead of secondary server immediately.)

# /etc/init.d/fluent-agent-lite reload

To reflect change of config file, you must do 'restart'.

Copyright 2012- TAGOMORI Satoshi (tagomoris)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.