Docker tip : inspect and grep

• Full Bright
• 1 minute to read
• Aug 4, 2020 (5 years and 3 months ago) (Updated: Nov 24, 2025)
• 0 Comments

Summary

• Docker inspect and grep

Docker inspect and grep

This isn’t so much a [[2020-08-04-docker-tip-inspect-and-jq

docker]] [[2020-08-04-docker-tip-inspect-and-less

tip]], as it is a jq tip. If you haven’t heard of jq, it is a great tool for parsing JSON from the command line. This also makes it a great tool to see what is happening in a [[2022-09-21-how-do-you-ping-a-docker-container-from-the-outside

container]] instead of having to [[2022-07-27-jenkins-ci-pipeline-scripts-not-permitted-to-use-method-groovy-lang-groovyobject

use]] the –format specifier which I can never remember how to use exactly:

# Get network information:
$ [[2022-07-21-how-to-run-jenkins-jobs-with-docker|docker]] inspect 4c45aea49180 | jq '.[].NetworkSettings.Networks'
{
  "bridge": {
    "EndpointID": "ba1b6efba16de99f260e0fa8892fd4685dbe2f79cba37ac0114195e9fad66075",
    "Gateway": "172.17.0.1",
    "IPAddress": "172.17.0.2",
    "IPPrefixLen": 16,
    "IPv6Gateway": "",
    "GlobalIPv6Address": "",
    "GlobalIPv6PrefixLen": 0,
    "MacAddress": "02:42:ac:11:00:02"
  }
}

# Get the arguments with which the [[2022-01-15-3-ways-to-connect-your-dolibarr-container-to-local-database|container]] was started

$ [[2020-04-03-how-to-setup-your-local-nodejs-development-environment-using-docker|docker]] inspect 4c45aea49180 | jq '.[].Args'
[
"-server",
"-advertise",
"192.168.99.100",
"-bootstrap-expect",
"1"
]

# Get all the mounted volumes

11:22 $ [[2022-08-24-what-is-difference-between-docker-attach-and-exec|docker]] inspect 4c45aea49180 | jq '.[].Mounts'
[
{
"Name": "a8125ffdf6c4be1db4464345ba36b0417a18aaa3a025267596e292249ca4391f",
"Source": "/mnt/sda1/var/lib/[[2022-01-15-how-do-i-connect-mysql-workbench-to-mysql-inside-docker|docker]]/volumes/a8125ffdf6c4be1db4464345ba36b0417a18aaa3a025267596e292249ca4391f/_data",
"Destination": "/data",
"Driver": "local",
"Mode": "",
"RW": true
}
]

And of course also works great for querying other kinds of ([[2022-03-27-how-do-i-access-the-host-port-in-a-docker-container

docker]]-esque) APIs that produce JSON (e.g Marathon, Mesos, Consul etc.). JQ provides a very extensive API for accessing and processing JSON. More information can be found here: https://stedolan.github.io/jq/

• docker
• en