Get the mesos log in your CLI.

mesos_log.rb

require 'json'
require 'net/http'
require 'openssl'

MESOS_BASE_PATH = "https://hostname/path_to_mesos"
MESOS_USER = "<SOMEUSER>"
MESOS_PASSWORD = ""

def get(offset,length=500000)
  _ = Time.now.to_i * 100 + 100
  url = MESOS_BASE_PATH + "/files/read?path=/master/log&offset=#{offset}&length=#{length}&jsonp=&_=#{_}"
  output = `curl -s -k -u #{MESOS_USER}:#{MESOS_PASSWORD} '#{url}'`.chomp
  json = output[1..-3]
  JSON.parse(json)["data"]
end

offset = 0
buffer = ""
loop do
  new = get(offset)
  if new.length == 0
    sleep 1
    next
  else
    offset += new.length
    buffer += new
    last_nl = buffer.rindex("\n")
    if last_nl != nil
      new_lines = buffer[0..last_nl]
      buffer = buffer[(last_nl+1)..-1]
      print new_lines
    end
  end
end