bateau

bateau

Docker ps on steroids, aka rich querying language for filtering docker containers and images

Examples:

Find all containers created more than 2 weeks ago which are not running, except for the container named precious, and delete them:

$ bateau 'created > 2w & !running & name!=precious' | xargs docker rm -fv

Find all containers with either a org/web-app image, or whose name container my-app or with a role label set to web, and which exited with a non-zero code, and pipe them to docker inspect.

$ bateau '(image=org/web-app | name~my-app | label.role=web) & exit!=0' | xargs docker inspect

Find all images weighing more than 300MB which were created more than 2 months ago or which were built by docker 1.5 or 1.6:

$ bateau -i 'size>300MB & (created > 2M | docker_version~1.5 | docker_version~1.6)'

Motivation

The default docker ps command has a couple of shortcomings:

• Inconsistent handling of invalid filtering keys. For example, docker images will reject unknown fields, whereas docker ps would not.
• No handling of invalid syntax: docker ps will accept "a & b.c=42" as a filter without complaining
• No support for other operators than =
• Due to the previous point, docker ps and co need to expose various flags (--before, --since, ...) to implement features which could have been implemented as regular filter if more operators were supported, e.g. >, <, or before ...
• Filters can only be combined using the and boolean operation. there is no way to combine them using or. It is not possible to retrieve in one-shot containers having one of two different labels for example.
• Filters cannot be negated. It is not possible to retrieve the containers without a specific label for example.

Usage

Usage: bateau [-e] [-c|-i] QUERY

Docker ps on steroids

Arguments:
  QUERY=""     The containers filtering query

Options:
  -e, --endpoint=""       The docker socket path or TCP address
  -c, --containers=true   Filter on containers
  -i, --images=false      Filter on images

Query syntax

Conditions

Conditions can be written as just a field name, e.g.:

running

or:

label.arch

For boolean fields. Most fields require an operator and a value.

Supported operators are:

• =: strict equal: name=container1
• ~: like operator: case insensitive string contains: name~tAiNe
• !=: not equal: exit!=0
• !~: not like: image!~db
• >, >=, < and <=: greater than, greater than or equal, less than and less than or equal: size>15MB, created<=1d, ...

Negation

You can use the ! operator to negate an expression: !running, !exit=42

Or/And

Expressions can be combined together using the | and & boolean operators: running & created>1d, size>10MB | name~junk

Parenthesis

Expressions can be wrapped inside parenthesis to control the operator precedence: !(running | paused), image~server & (running | exit=0)

Supported fields:

Containers

Images

Value formats

Durations

The created and exited fields accept values using the duration syntax:

1s
2h 40m
30w

A duration is a sequence of one or more number and unit pairs. The supported units are:

• ms for milliseconds
• s for seconds
• m for minutes
• h for hours
• d for days (24 hours)
• w for weeks (7 days)
• M or months for months (30 days)
• y for years (365 days)

Sizes

The size field accepts values using the size syntax:

12
400MB
1GB 250MB 14Kb

A size is a sequence of one or more number and unit pairs. The supported units are:

• for bytes
• kb or Kb: 1000 bytes
• KB: 1024 bytes
• Mb: 1000Kb
• MB: 1024KB
• Gb: 1000Mb
• GB: 1024MB

License

This work is published under the MIT license.

Please see the LICENSE file for details.