Container logging configuration

By default Docker writes container logs to the host filesystem — fine for local development. In a big cluster you usually want logs in centralized storage such as Logstash or Graylog.

Docker supports this through logging drivers, and WebSummoner lets you set the driver globally for every browser container it starts, via the -log-conf flag.

File format

config/container-logs.json:

{
  "Type": "syslog",
  "Config": {
    "syslog-address": "tcp://192.168.0.42:123",
    "syslog-facility": "daemon"
  }
}

Type — any Docker logging driver: syslog, journald, awslogs, …
Config — key-value options for that driver.

The example above is equivalent to running containers with:

--log-driver=syslog \
--log-opt syslog-address=tcp://192.168.0.42:123 \
--log-opt syslog-facility=daemon

Using it

./websummoner -log-conf config/container-logs.json