Class: Riemann::Tools::Health

Inherits:
Object
  • Object
show all
Includes:
Riemann::Tools, Utils
Defined in:
lib/riemann/tools/health.rb

Constant Summary collapse

PROC_PID_INIT_INO = 
0xEFFFFFFC
SI_UNITS = 
'_kMGTPEZYRQ'

Constants included from Riemann::Tools

VERSION

Instance Attribute Summary

Attributes included from Riemann::Tools

#argv

Instance Method Summary collapse

Methods included from Utils

#distance_of_time_in_words_to_utcnow, #pluralize_string, #reverse_numeric_sort_with_header, #utcnow, #when_from_utcnow

Methods included from Riemann::Tools

#attributes, #endpoint_name, included, #options, #report, #riemann, #run

Constructor Details

#initialize ⇒ Health

Returns a new instance of Health.



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# File 'lib/riemann/tools/health.rb', line 37

def initialize
  super

  @limits = {
    cpu: { critical: opts[:cpu_critical], warning: opts[:cpu_warning] },
    disk: { critical: opts[:disk_critical], warning: opts[:disk_warning], critical_leniency_kb: human_size_to_number(opts[:disk_critical_leniency]) / 1024, warning_leniency_kb: human_size_to_number(opts[:disk_warning_leniency]) / 1024 },
    load: { critical: opts[:load_critical], warning: opts[:load_warning] },
    memory: { critical: opts[:memory_critical], warning: opts[:memory_warning] },
    uptime: { critical: opts[:uptime_critical], warning: opts[:uptime_warning] },
    users: { critical: opts[:users_critical], warning: opts[:users_warning] },
    swap: { critical: opts[:swap_critical], warning: opts[:swap_warning] },
  }
  case (@ostype = `uname -s`.chomp.downcase)
  when 'darwin'
    @cores = `sysctl -n hw.ncpu`.to_i
    @cpu = method :darwin_cpu
    @disk = method :disk
    @load = method :darwin_load
    @memory = method :darwin_memory
    @uptime = method :bsd_uptime
    @swap = method :bsd_swap
  when 'freebsd'
    @cores = `sysctl -n hw.ncpu`.to_i
    @cpu = method :freebsd_cpu
    @disk = method :disk
    @load = method :bsd_load
    @memory = method :freebsd_memory
    @uptime = method :bsd_uptime
    @swap = method :bsd_swap
  when 'openbsd'
    @cores = `sysctl -n hw.ncpu`.to_i
    @cpu = method :openbsd_cpu
    @disk = method :disk
    @load = method :bsd_load
    @memory = method :openbsd_memory
    @uptime = method :bsd_uptime
    @swap = method :bsd_swap
  when 'sunos'
    @cores = `mpstat -a 2>/dev/null`.split[33].to_i
    @cpu = method :sunos_cpu
    @disk = method :disk
    @load = method :bsd_load
    @memory = method :sunos_memory
    @uptime = method :bsd_uptime
    @swap = method :bsd_swap
  else
    @cores = `nproc`.to_i
    puts "WARNING: OS '#{@ostype}' not explicitly supported. Falling back to Linux" unless @ostype == 'linux'
    @cpu = method :linux_cpu
    @disk = method :disk
    @load = method :linux_load
    @memory = method :linux_memory
    @uptime = method :linux_uptime
    @swap = method :linux_swap
    @supports_exclude_type = `df --help 2>&1 | grep -e "--exclude-type"` != ''
  end
  @users = method :users

  opts[:checks].each do |check|
    case check
    when 'disk'
      @disk_enabled = true
    when 'load'
      @load_enabled = true
    when 'cpu'
      @cpu_enabled = true
    when 'memory'
      @memory_enabled = true
    when 'uptime'
      @uptime_enabled = true
    when 'users'
      @users_enabled = true
    when 'swap'
      @swap_enabled = true
    end
  end

  invalidate_cache
end

Instance Method Details

#alert(service, state, metric, description) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 117

def alert(service, state, metric, description)
  report(
    service: service.to_s,
    state: state.to_s,
    metric: metric.to_f,
    description: description,
  )
end

#bsd_load ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 321

def bsd_load
  load = uptime[:load_averages][1] / @cores
  if load > @limits[:load][:critical]
    alert 'load', :critical, load, "1-minute load average/core is #{load}"
  elsif load > @limits[:load][:warning]
    alert 'load', :warning, load, "1-minute load average/core is #{load}"
  else
    alert 'load', :ok, load, "1-minute load average/core is #{load}"
  end
end

#bsd_swap ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 471

def bsd_swap
  _device, blocks, used, _avail, _capacity = `swapinfo`.lines.last.split(/\s+/)

  value = Float(used) / Integer(blocks)

  report_pct :swap, value, 'used'
rescue ArgumentError
  # Ignore
end

#bsd_uptime ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 453

def bsd_uptime
  value = uptime[:uptime]

  report_uptime(value)
end

#darwin_cpu ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 383

def darwin_cpu
  topdata = darwin_top
  unless topdata[:cpu]
    alert 'cpu', :unknown, nil, 'unable to get CPU stats from top'
    return false
  end
  report_pct :cpu, topdata[:cpu], "usage\n\n#{reverse_numeric_sort_with_header(`ps -eo pcpu,pid,comm`)}"
end

#darwin_load ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 392

def darwin_load
  topdata = darwin_top
  unless topdata[:load]
    alert 'load', :unknown, nil, 'unable to get load ave from top'
    return false
  end
  metric = topdata[:load] / @cores
  if metric > @limits[:load][:critical]
    alert 'load', :critical, metric, "1-minute load average per core is #{metric}"
  elsif metric > @limits[:load][:warning]
    alert 'load', :warning, metric, "1-minute load average per core is #{metric}"
  else
    alert 'load', :ok, metric, "1-minute load average per core is #{metric}"
  end
end

#darwin_memory ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 408

def darwin_memory
  topdata = darwin_top
  unless topdata[:memory]
    alert 'memory', :unknown, nil, 'unable to get memory data from top'
    return false
  end
  report_pct :memory, topdata[:memory], "usage\n\n#{reverse_numeric_sort_with_header(`ps -eo pmem,pid,comm`)}"
end

#darwin_top ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 354

def darwin_top
  return @cached_data[:darwin_top] if @cached_data[:darwin_top]

  raw = `top -l 1 | grep -i "^\\(cpu\\|physmem\\|load\\)"`.chomp
  topdata = {}
  raw.each_line do |ln|
    if ln.match(/Load Avg: [0-9.]+, [0-9.]+, ([0-9.])+/i)
      topdata[:load] = Regexp.last_match(1).to_f
    elsif ln.match(/CPU usage: [0-9.]+% user, [0-9.]+% sys, ([0-9.]+)% idle/i)
      topdata[:cpu] = 1 - (Regexp.last_match(1).to_f / 100)
    elsif (mdat = ln.match(/PhysMem: ([0-9]+)([BKMGT]) wired, ([0-9]+)([BKMGT]) active, ([0-9]+)([BKMGT]) inactive, ([0-9]+)([BKMGT]) used, ([0-9]+)([BKMGT]) free/i))
      wired = mdat[1].to_i * (1024**'BKMGT'.index(mdat[2]))
      active = mdat[3].to_i * (1024**'BKMGT'.index(mdat[4]))
      inactive = mdat[5].to_i * (1024**'BKMGT'.index(mdat[6]))
      used = mdat[7].to_i * (1024**'BKMGT'.index(mdat[8]))
      free = mdat[9].to_i * (1024**'BKMGT'.index(mdat[10]))
      topdata[:memory] = (wired + active + used).to_f / (wired + active + used + inactive + free)
    # This is for OSX Mavericks which
    # uses a different format for top
    # Example: PhysMem: 4662M used (1328M wired), 2782M unused.
    elsif (mdat = ln.match(/PhysMem: ([0-9]+)([BKMGT]) used \([0-9]+[BKMGT] wired\), ([0-9]+)([BKMGT]) unused/i))
      used = mdat[1].to_i * (1024**'BKMGT'.index(mdat[2]))
      unused = mdat[3].to_i * (1024**'BKMGT'.index(mdat[4]))
      topdata[:memory] = used.to_f / (used + unused)
    end
  end
  @cached_data[:darwin_top] = topdata
end

#df ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 417

def df
  case @ostype
  when 'darwin', 'freebsd', 'openbsd'
    `df -Pk -t no#{opts[:disk_ignorefs].join(',')}`
  when 'sunos'
    `df -Pk` # Is there a good way to exlude iso9660 here?
  else
    if @supports_exclude_type
      `df -Pk #{opts[:disk_ignorefs].map { |fstype| "--exclude-type=#{fstype}" }.join(' ')}`
    else
      `df -Pk`
    end
  end
end

#disk ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 432

def disk
  df.lines[1..].each do |r|
    f = r.split(/\s+/)

    # Calculate capacity
    used = f[2].to_i
    available = f[3].to_i
    total_without_reservation = used + available

    x = used.to_f / total_without_reservation

    if x > @limits[:disk][:critical] && available < @limits[:disk][:critical_leniency_kb]
      alert "disk #{f[5]}", :critical, x, "#{f[4]} used"
    elsif x > @limits[:disk][:warning] && available < @limits[:disk][:warning_leniency_kb]
      alert "disk #{f[5]}", :warning, x, "#{f[4]} used"
    else
      alert "disk #{f[5]}", :ok, x, "#{f[4]} used, #{number_to_human_size(available * 1024, :floor)} free"
    end
  end
end

#freebsd_cpu ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 247

def freebsd_cpu
  u2, n2, s2, t2, i2 = `sysctl -n kern.cp_time 2>/dev/null`.split.map(&:to_i) # FreeBSD has 5 cpu stats

  if @old_cpu
    u1, n1, s1, t1, i1 = @old_cpu

    used = (u2 + n2 + s2 + t2) - (u1 + n1 + s1 + t1)
    total = used + i2 - i1
    fraction = used.to_f / total

    report_pct :cpu, fraction,
               "user+nice+sytem+interrupt\n\n#{reverse_numeric_sort_with_header(`ps -axo pcpu,pid,comm`)}"
  end

  @old_cpu = [u2, n2, s2, t2, i2]
end

#freebsd_memory ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 332

def freebsd_memory
  meminfo = `sysctl -n vm.stats.vm.v_page_count vm.stats.vm.v_wire_count vm.stats.vm.v_active_count 2>/dev/null`.chomp.split
  fraction = (meminfo[1].to_f + meminfo[2].to_f) / meminfo[0].to_f

  report_pct :memory, fraction, "used\n\n#{reverse_numeric_sort_with_header(`ps -axo pmem,pid,comm`)}"
end

#human_size_to_number(value) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 514

def human_size_to_number(value)
  case value
  when /^\d+$/ then value.to_i
  when /^\d+k$/i then value.to_i * 1024
  when /^\d+M$/i then value.to_i * (1024**2)
  when /^\d+G$/i then value.to_i * (1024**3)
  when /^\d+T$/i then value.to_i * (1024**4)
  when /^\d+P$/i then value.to_i * (1024**5)
  when /^\d+E$/i then value.to_i * (1024**6)
  when /^\d+Z$/i then value.to_i * (1024**7)
  when /^\d+Y$/i then value.to_i * (1024**8)
  when /^\d+R$/i then value.to_i * (1024**9)
  when /^\d+Q$/i then value.to_i * (1024**10)
  else
    raise %(Malformed size "#{value}", syntax is [0-9]+[#{SI_UNITS[1..]}]?)
  end
end

#invalidate_cache ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 551

def invalidate_cache
  @cached_data = {}
end

#linux_cpu ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 169

def linux_cpu
  new = File.read('/proc/stat')
  unless new[/cpu\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)/]
    alert 'cpu', :unknown, nil, "/proc/stat doesn't include a CPU line"
    return false
  end
  u2, n2, s2, i2 = [Regexp.last_match(1), Regexp.last_match(2), Regexp.last_match(3),
                    Regexp.last_match(4),].map(&:to_i)

  if @old_cpu
    u1, n1, s1, i1 = @old_cpu

    used = (u2 + n2 + s2) - (u1 + n1 + s1)
    total = used + i2 - i1
    fraction = used.to_f / total

    report_pct :cpu, fraction, "user+nice+system\n\n#{reverse_numeric_sort_with_header(`ps -eo pcpu,pid,comm`)}"
  end

  @old_cpu = [u2, n2, s2, i2]
end

#linux_load ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 191

def linux_load
  load = File.read('/proc/loadavg').split(/\s+/)[0].to_f / @cores
  if load > @limits[:load][:critical]
    alert 'load', :critical, load, "1-minute load average/core is #{load}"
  elsif load > @limits[:load][:warning]
    alert 'load', :warning, load, "1-minute load average/core is #{load}"
  else
    alert 'load', :ok, load, "1-minute load average/core is #{load}"
  end
end

#linux_memory ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 202

def linux_memory
  m = File.read('/proc/meminfo').split("\n").each_with_object({}) do |line, info|
    x = line.split(/:?\s+/)
    # Assume kB...
    info[x[0]] = x[1].to_i
  end

  free = m['MemFree'] + m['Buffers'] + m['Cached'] + linux_zfs_arc_evictable_memory
  total = m['MemTotal']
  fraction = 1 - (free.to_f / total)

  report_pct :memory, fraction, "used\n\n#{reverse_numeric_sort_with_header(`ps -eo pmem,pid,comm`)}"
end

#linux_running_in_container? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/riemann/tools/health.rb', line 164

def linux_running_in_container?
  @linux_running_in_container = File.readlink('/proc/self/ns/pid') != "pid:[#{PROC_PID_INIT_INO}]" if @linux_running_in_container.nil?
  @linux_running_in_container
end

#linux_swap ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 481

def linux_swap
  total_size = 0.0
  total_used = 0.0

  File.read('/proc/swaps').lines.each_with_index do |line, n|
    next if n.zero?

    _filename, _type, size, used, _priority = line.split(/\s+/)

    total_size += size.to_f
    total_used += used.to_f
  end

  return if total_size.zero?

  value = total_used / total_size

  report_pct :swap, value, 'used'
end

#linux_uptime ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 459

def linux_uptime
  value = File.read('/proc/uptime').split(/\s+/)[0].to_f

  report_uptime(value)
end

#linux_zfs_arc_evictable_memory ⇒ Object

On Linux, the ZFS ARC is reported as used, not as cached memory. github.com/openzfs/zfs/issues/10251

Gather ZFS ARC statisticts about evictable memory. The available fields are listed here: github.com/openzfs/zfs/blob/master/include/sys/arc_impl.h



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# File 'lib/riemann/tools/health.rb', line 222

def linux_zfs_arc_evictable_memory
  # When the system is a container, it can access the hosts stats that
  # cause invalid memory usage reporting.  We should only remove
  # evictable memory from the ZFS ARC on the host system.
  return 0 if linux_running_in_container?

  m = File.readlines('/proc/spl/kstat/zfs/arcstats').each_with_object(Hash.new(0)) do |line, info|
    x = line.split(/\s+/)
    info[x[0]] = x[2].to_i
  end

  (
    m['anon_evictable_data'] +
    m['anon_evictable_metadata'] +
    m['mru_evictable_data'] +
    m['mru_evictable_metadata'] +
    m['mfu_evictable_data'] +
    m['mfu_evictable_metadata'] +
    m['uncached_evictable_data'] +
    m['uncached_evictable_metadata']
  ) / 1024 # We want kB...
rescue Errno::ENOENT
  0
end

#number_to_human_size(value, rounding = :round) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 532

def number_to_human_size(value, rounding = :round)
  return value.to_s if value < 1024

  r = Math.log(value, 1024).floor
  format('%<size>.1f%<unit>ciB', size: (value.to_f / (1024**r)).send(rounding, 1), unit: SI_UNITS[r])
end

#openbsd_cpu ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 264

def openbsd_cpu
  u2, n2, s2, t2, i2 = # OpenBSD separates with ,
    `sysctl -n kern.cp_time 2>/dev/null`.split(',').map(&:to_i)
  if @old_cpu
    u1, n1, s1, t1, i1 = @old_cpu

    used = (u2 + n2 + s2 + t2) - (u1 + n1 + s1 + t1)
    total = used + i2 - i1
    fraction = used.to_f / total

    report_pct :cpu, fraction,
               "user+nice+sytem+interrupt\n\n#{reverse_numeric_sort_with_header(`ps -axo pcpu,pid,comm`)}"
  end

  @old_cpu = [u2, n2, s2, t2, i2]
end

#openbsd_memory ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 339

def openbsd_memory
  meminfo = `vmstat 2>/dev/null`.chomp.split
  fraction = meminfo[28].to_f / meminfo[29] # The ratio of active to free memory unlike the others :(

  report_pct :memory, fraction, "used\n\n#{reverse_numeric_sort_with_header(`ps -axo pmem,pid,comm`)}"
end

#report_int(service, value, report) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 138

def report_int(service, value, report)
  return unless value

  if value >= @limits[service][:critical]
    alert service, :critical, value, "#{value} #{report}"
  elsif value >= @limits[service][:warning]
    alert service, :warning, value, "#{value} #{report}"
  else
    alert service, :ok, value, "#{value} #{report}"
  end
end

#report_pct(service, fraction, report) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 126

def report_pct(service, fraction, report)
  return unless fraction

  if fraction > @limits[service][:critical]
    alert service, :critical, fraction, "#{format('%.2f', fraction * 100)}% #{report}"
  elsif fraction > @limits[service][:warning]
    alert service, :warning, fraction, "#{format('%.2f', fraction * 100)}% #{report}"
  else
    alert service, :ok, fraction, "#{format('%.2f', fraction * 100)}% #{report}"
  end
end

#report_uptime(uptime) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 150

def report_uptime(uptime)
  return unless uptime

  description = uptime_to_human(uptime)

  if uptime < @limits[:uptime][:critical]
    alert 'uptime', :critical, uptime, description
  elsif uptime < @limits[:uptime][:warning]
    alert 'uptime', :warning, uptime, description
  else
    alert 'uptime', :ok, uptime, description
  end
end

#sunos_cpu ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 281

def sunos_cpu
  mpstats = `mpstat -a 2>/dev/null`.split
  u2 = mpstats[29].to_i
  s2 = mpstats[30].to_i
  t2 = mpstats[31].to_i
  i2 = mpstats[32].to_i

  if @old_cpu
    u1, s1, t1, i1 = @old_cpu

    used = (u2 + s2 + t2) - (u1 + s1 + t1)
    total = used + i2 - i1
    fraction = if i2 == i1 && used.zero? # If the system is <1% used in both samples then total will be 0 + (99 - 99), avoid a div by 0
                 0
               else
                 used.to_f / total
               end

    report_pct :cpu, fraction,
               "user+sytem+interrupt\n\n#{reverse_numeric_sort_with_header(`ps -ao pcpu,pid,comm`)}"
  end

  @old_cpu = [u2, s2, t2, i2]
end

#sunos_memory ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 346

def sunos_memory
  meminfo = `vmstat 2>/dev/null`.chomp.split
  total_mem = `prtconf | grep Memory`.split[2].to_f * 1024 # reports in GB but vmstat is in MB
  fraction = (total_mem - meminfo[32].to_f) / total_mem

  report_pct :memory, fraction, "used\n\n#{reverse_numeric_sort_with_header(`ps -ao pmem,pid,comm`)}"
end

#tick ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 539

def tick
  invalidate_cache

  @cpu.call if @cpu_enabled
  @memory.call if @memory_enabled
  @disk.call if @disk_enabled
  @load.call if @load_enabled
  @uptime.call if @uptime_enabled
  @users.call if @users_enabled
  @swap.call if @swap_enabled
end

#uptime ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 310

def uptime
  @cached_data[:uptime] ||= uptime_parser.parse(`uptime`)
rescue Racc::ParseError => e
  report(
    service: 'uptime',
    description: "Error parsing uptime: #{e.message}",
    state: 'critical',
  )
  @cached_data[:uptime] = {}
end

#uptime_parser ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 306

def uptime_parser
  @uptime_parser ||= UptimeParser.new
end

#uptime_to_human(value) ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 501

def uptime_to_human(value)
  seconds = value.to_i
  days = seconds / 86_400
  seconds %= 86_400
  hrs = seconds / 3600
  seconds %= 3600
  mins = seconds / 60
  [
    ("#{days} day#{'s' if days > 1}" unless days.zero?),
    format('%<hrs>2d:%<mins>02d', hrs: hrs, mins: mins),
  ].compact.join(' ')
end

#users ⇒ Object 



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# File 'lib/riemann/tools/health.rb', line 465

def users
  value = uptime[:users]

  report_int(:users, value, "user#{'s' if value != 1}")
end