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Use case, Input forward, Output file

Run fluent-bit service container:

# Setup variables
repo_name="fluent/fluent-bit" # https://hub.docker.com/r/fluent/fluent-bit/
container_name="fluent-bit-deamon-set"

# create an empty folder to store fluent-bit log files
mkdir -p ${HOME}/fluent-bit-log

# run fluent-bit container
# input=forward https://docs.fluentbit.io/manual/pipeline/inputs/forward
# output=standard-out https://docs.fluentbit.io/manual/pipeline/outputs/file
# for testing, -f 1 specified the flush timeout = 1, it means flushing data to output every 1 sec
sudo docker run --rm --name "${container_name}" --mount type=bind,source=${HOME}/fluent-bit-log,target=/tmp -p 127.0.0.1:24224:24224 ${repo_name} /fluent-bit/bin/fluent-bit -i forward -o file -p path=/tmp -p format=json_lines

Run app container, generate some logs:

# Setup variables repo_name=”ubuntu” # https://hub.docker.com/_/ubuntu

# generate a log message sudo docker run –rm –log-driver=fluentd -t ${repo_name} echo Hello World

# verify log appears in ${HOME}/fluent-bit-log directory ls ~/fluent-bit-log cat ~/fluent-bit-log/08be78c9ab37