Action "lxc.goodies.prlimit"

Print the process limit associated with a running container.

The action require the prlimit command to be available. On Ubuntu, use apt install util-linux.

Note, the action must be executed on the host container of the machine. When using a remote LXD server or cluster, you must know on which node the machine is running and run the action in this node.

Output

error (object) The error object, if any.
output.stdout (string) The standard output from the prlimit command.
output.limits (array) The limit object parsed from stdout; each element of the array contains the keys resource, description, soft, hard and units.

Example

const {stdout, limits} = await nikita.lxc.goodies.prlimit({
  container: "my_container"
})
console.info( `${stdout} ${JSON.decode(limits)}`)

Schema definitions

definitions =
  config:
    type: 'object'
    properties:
      'container':
        $ref: 'module://@nikitajs/lxd/src/init#/definitions/config/properties/container'
    required: ['container']

Handler

handler = ({config}) ->
  try
    {stdout} = await @execute
      command: """
      command -v prlimit || exit 3
      sudo prlimit -p $(lxc info #{config.container} | awk '$1==\"PID:\"{print $2}')
      """
    limits = for line, i in utils.string.lines stdout
      continue if i is 0
      [resource, description, soft, hard, units] = line.split /\s+/
      resource: resource
      description: description
      soft: soft
      hard: hard
      units: units
    stdout: stdout, limits: limits
  catch err
    err = errors.NIKITA_LXC_PRLIMIT_MISSING() if err.exit_code is 3
    throw err

Errors

errors =
NIKITA_LXC_PRLIMIT_MISSING: ->
  utils.error 'NIKITA_LXC_PRLIMIT_MISSING', [
    'this action requires prlimit installed on the host'
  ]

Exports

module.exports =
  handler: handler
  metadata:
    definitions: definitions
    shy: true

Dependencies

utils = require '../utils'

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