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Dockerized Logstash Forwarder: A tool to collect logs locally in preparation for processing elsewhere!

If you want the ELK stack, checkout elk-stack.

Pull Image from Docker Hub Registry.

docker pull pasangsherpa/logstash-forwarder

Run and test

# The container runs as 'logstash-forwarder' executable. 
docker run -i --rm pasangsherpa/logstash-forwarder -h

# Read logs from stdin
docker run -i --rm -v `pwd`/config/conf-stdin:/opt/conf \
                   -v `pwd`/config/certs:/opt/certs \
test stdin
test stdin

# Pipe logs to stdin from node server using debug module
DEBUG=test:server npm start | docker run -i --rm \
                    -v `pwd`/config/conf-stdin:/opt/conf \
                    -v `pwd`/config/certs:/opt/certs \

# Read logs from a file
docker run --name forwarder -d \
           -v /var/log/test:/var/log \
           -v `pwd`/config/conf:/opt/conf \
           -v `pwd`/config/certs:/opt/certs \

cat >> /var/log/test/test.log
test file
test file

# Stop and remove container
docker rm $(docker stop forwarder)

Log in to the Kibana interface, you should see the logs 3 test messages there.


/opt/conf  - Configuration folder with logstash-forwarder.conf
/opt/certs - Certs folder with logstash-forwarder.crt and logstash-forwarder.key (used to start logstash)

Example logstash-forwarder.conf. NOTE: Replace '<logstash_server_fqdn>' with your logstash server dns.

  "network": {
    "servers": [ "<logstash_server_fqdn>:5000" ],
    "ssl ca": "/opt/certs/logstash-forwarder.crt", # ssl cert generated in logstash server
    "timeout": 15
  "files": [
      "paths": [ "/var/log/test.log" ]

Generating ssl certificate in the logstash server

cd /etc/pki/tls;
sudo openssl req -subj '/CN=<logstash_server_fqdn>/' -x509 -days 3650 -batch -nodes -newkey rsa:2048 -keyout private/logstash-forwarder.key -out certs/logstash-forwarder.crt


MIT © Pasang Sherpa

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