Docker Swarm logging

This guide describes how you can set up log forwarding from your Docker Swarm environments to LOGIQ. To forward logs from Docker Swarm to LOGIQ, do the following.
Deploy fluent-bit container
Create the following files:
parsers.conf
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[PARSER]
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    Name   json
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    Format json
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fluent-bit.conf
Update the LOGIQ host and Authorization Header in the file. The token can be obtained from LOGIQ UI as described here.
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[SERVICE]
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    Flush        1
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    Parsers_File /fluent-bit/etc/parsers.conf
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    Log_Level    error
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​
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# collect docker logs using fluend logging driver
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[INPUT]
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    Name forward
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    Listen 0.0.0.0
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    port 24224
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​
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# try parsing log as json and lift its keys to the first-level
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[FILTER]
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    Name parser
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    Match *
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    Parser json
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    Key_Name log
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    Reserve_Data On
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​
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[OUTPUT]
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    name     http
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    match    *
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    host     <LOGIQ-endpoint>
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    port     443
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    URI      /v1/json_batch
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    Format   json
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    tls      on
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    tls.verify  off
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    net.keepalive  off
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    compress      gzip
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    Header Authorization Bearer <Token>
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docker-compose.fluent.yaml
Ensure that the Fluent Bit Docker Compose uses the parsers.conf and fluent-bit.conf which we prepared in the previous step. 
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version: "3.7"
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​
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services:
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  fluent-bit:
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    image: fluent/fluent-bit:latest
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    volumes:
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      - ./fluent-bit.conf:/fluent-bit/etc/fluent-bit.conf
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      - ./parsers.conf:/fluent-bit/etc/parsers.conf
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    ports:
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      - "24224:24224"
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      - "24224:24224/udp"
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Run the following command to get fluent-bit running in your Docker Swarm cluster.
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docker stack deploy --compose-file docker-compose.fluent.yaml fluent-bit
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Ensure that the fluent-bit container is running in the cluster.
Update services to add logging driver
Add the global logging configuration to your docker-compose files as shown below
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x-logging: &default-logging
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  driver: fluentd
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Update the services in docker-compose files to add logging configuration and environment variables. The Namespaceand AppName set in the service definition defines how the logs from the service are indexed in LOGIQ.
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        environment:
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            Namespace: production
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            AppName: nginx
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        logging:
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            driver: fluentd
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            options:
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                env: "Namespace,AppName"
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Examples
If your default Docker Compose file looks like this:
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version: "3.4"
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​
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Services:
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  log_creator:
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        image: alpine:3.12.4
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         command: >
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            sh -c '
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                counter=0
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                while :
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                do
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                    sleep 1
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                    echo "{\"message\": \"log line $counter\", \"something\": \"else\"}"
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                    counter=$(($counter + 1))
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                done'
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​
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​
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After you’ve added the logging configuration, your Docker Compose file should look like this.
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version: "3.4"
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​
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x-logging: &default-logging
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  driver: fluentd
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​
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services:
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      log_creator:
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        image: alpine:3.12.4
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        logging: *default-logging
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        command: >
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            sh -c '
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                counter=0
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                while :
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                do
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                    sleep 1
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                    echo "{\"message\": \"log line $counter\", \"something\": \"else\"}"
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                    counter=$(($counter + 1))
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                done'
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        environment:
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            Namespace: logiq-namespace
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            AppName: log-generator
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        logging:
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            driver: fluentd
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            options:
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                env: "Namespace,AppName"
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Run the following command to run the container. 
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docker stack deploy --compose-file logger-test.yaml logger-test
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Your Docker Swarm logs will now be ingested into LOGIQ.

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Contents

Deploy fluent-bit container

Update services to add logging driver