Image showing Docker tip : inspect and grep

Docker tip : inspect and grep

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Docker inspect and grep

This isn’t so much a docker 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 container instead of having to use the –format specifier which I can never remember how to use exactly:

# Get network information:
$ docker inspect 4c45aea49180 | jq '.[].NetworkSettings.Networks'
  "bridge": {
    "EndpointID": "ba1b6efba16de99f260e0fa8892fd4685dbe2f79cba37ac0114195e9fad66075",
    "Gateway": "",
    "IPAddress": "",
    "IPPrefixLen": 16,
    "IPv6Gateway": "",
    "GlobalIPv6Address": "",
    "GlobalIPv6PrefixLen": 0,
    "MacAddress": "02:42:ac:11:00:02"

# Get the arguments with which the container was started

$ docker inspect 4c45aea49180 | jq '.[].Args'

# Get all the mounted volumes

11:22 $ docker inspect 4c45aea49180 | jq '.[].Mounts'
"Name": "a8125ffdf6c4be1db4464345ba36b0417a18aaa3a025267596e292249ca4391f",
"Source": "/mnt/sda1/var/lib/docker/volumes/a8125ffdf6c4be1db4464345ba36b0417a18aaa3a025267596e292249ca4391f/_data",
"Destination": "/data",
"Driver": "local",
"Mode": "",
"RW": true

And of course also works great for querying other kinds of (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:

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