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Chapter 5. Aggregating Container Logs

5.1. Overview
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As an OpenShift administrator, you may want to view the logs from all containers in one user interface. The currently supported method for aggregating container logs in OpenShift Enterprise is using a centralized file system. Additional supported methods are planned for inclusion in future releases.

Note

As packaging improvements are made, these instructions will be simplified.

5.2. Using a Centralized File System
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This method reads all container logs and forwards them to a central server for storage on the file system.

5.2.1. Installing fluentd (td-agent) on Nodes
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Perform the following steps on each node to install and configure fluentd (td-agent):

  1. Run the following commands: 

    # export RPM=td-agent-2.2.0-0.x86_64.rpm
# curl https://packages.treasuredata.com/2/redhat/7/x86_64/$RPM \
    -o /tmp/$RPM
# yum localinstall /tmp/$RPM
# /opt/td-agent/embedded/bin/gem install fluent-plugin-kubernetes
# mkdir -p /etc/td-agent/config.d
# chown td-agent:td-agent /etc/td-agent/config.d

  2. Create a directory to house the logs: 

    # mkdir -p /var/log/td-agent/tmp
# chown td-agent:td-agent /var/log/td-agent/tmp

    To allow td-agent access to the containers logs, create the /etc/sysconfig/td-agent file and ensure it contains the following: 

    DAEMON_ARGS=
TD_AGENT_ARGS="/usr/sbin/td-agent --log /var/log/td-agent/td-agent.log --use-v1-config"

  3. Add the following line to the /etc/td-agent/td-agent.conf file: 

      @include config.d/*.conf

  4. Create the /etc/td-agent/config.d/kubernetes.conf file with the following contents: 

        <source>
      type tail
      path /var/lib/docker/containers/*/*-json.log
      pos_file /var/log/td-agent/tmp/fluentd-docker.pos
      time_format %Y-%m-%dT%H:%M:%S
      tag docker.*
      format json
      read_from_head true
    </source>

    <match docker.var.lib.docker.containers.*.*.log>
      type kubernetes
      container_id ${tag_parts[5]}
      tag docker.${name}
    </match>

    <match kubernetes>
      type copy
      <store>
        type forward
        send_timeout 60s
        recover_wait 10s
        heartbeat_interval 1s
        phi_threshold 16
        hard_timeout 60s
        log_level trace
        require_ack_response true
        heartbeat_type tcp
        <server>
          name logging_name
    1 
    
          host host_name
    2 
    
          port 24224
          weight 60
        </server>

        <secondary>
          type file
          path /var/log/td-agent/forward-failed
        </secondary>
      </store>

      <store>
        type file
        path /var/log/td-agent/containers.log
        time_slice_format %Y%m%d
        time_slice_wait 10m
        time_format %Y%m%dT%H%M%S%z
        compress gzip
        utc
      </store>
    </match>
    1
    The name for the master that will be used during logging.
    2
    The IP or a DNS resolvable name used to access the master.
  5. Enable fluentd: 
# systemctl enable td-agent
# systemctl start td-agent
Tip

Any errors are logged in the /var/log/td-agent/td-agent.log file.

5.2.2. Optional Method to Verify Working Nodes
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You can optionally set up the master to be the aggregator to test and verify that the nodes are working properly.

  1. Install fluentd (td-agent) on the master: 

    # export RPM=td-agent-2.2.0-0.x86_64.rpm
# curl https://packages.treasuredata.com/2/redhat/7/x86_64/$RPM \
    -o /tmp/$RPM
# yum localinstall /tmp/$RPM
# mkdir -p /etc/td-agent/config.d
# chown td-agent:td-agent /etc/td-agent/config.d
  2. Ensure port 24224 is open on the master’s firewall to allow the nodes access.

  3. Configure fluentd to aggregate container logs by adding the following line to the /etc/td-agent/td-agent.conf file: 

      @include config.d/*.conf

  4. Create the /etc/td-agent/config.d/kubernetes.conf file with the following contents: 

        <match kubernetes.**>
        type file
        path /var/log/td-agent/containers.log
        time_slice_format %Y%m%d
        time_slice_wait 10m
        time_format %Y%m%dT%H%M%S%z
        compress gzip
        utc
    </match>

  5. Enable fluentd: 

    # systemctl enable td-agent
# systemctl start td-agent
    Tip

    Any errors are logged in the /var/log/td-agent/td-agent.log file.

You should now find all the containers' logs available on the master in the /var/log/td-agent/containers.log file.

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