Tuesday, 12 February 2019

Bringing it together ... Docker and AWK

Building on two earlier posts: -

AWK - It's my "new" best friend forever ....


here's a quick spot of tidying up completed/unwanted Docker containers, using the power of AWK: -

docker rm `docker ps -a|grep Exit|awk '{print $1}'`

So we're executing the result of: -

docker ps -a|grep Exit

e717fa412d6a        hello-world         "/hello"                 19 seconds ago      Exited (0) 18 seconds ago                          romantic_chatterjee
761e4ec73bb5        docker/whalesay     "cowsay 'Awwwww, tha…"   About an hour ago   Exited (0) About an hour ago                       jolly_sanderson
950cd9684ee6        docker/whalesay     "cowsay 'Aww Shucks …"   About an hour ago   Exited (0) About an hour ago                       clever_kare
d0d444d6f4f1        docker/whalesay     "cowsay Aww"             About an hour ago   Exited (0) About an hour ago                       pedantic_dirac
5c20a293793f        docker/whalesay     "cowsay Awwww Shucks…"   About an hour ago   Exited (0) About an hour ago                       dreamy_bell
d67c6d05cc24        docker/whalesay     "cowsay Awwww Shucks"    About an hour ago   Exited (0) About an hour ago                       quizzical_curran
7507f0df1db9        docker/whalesay     "cowsay Awwww"           About an hour ago   Exited (0) About an hour ago                       lucid_wright
77997983c07b        docker/whalesay     "cowsay"                 About an hour ago   Exited (0) About an hour ago                       festive_nobel
1b34cc7f227d        docker/whalesay     "cowsay boo"             About an hour ago   Exited (0) About an hour ago                       eager_khorana
517237d924bf        docker/whalesay     "cowsay boo"             27 hours ago        Exited (0) 27 hours ago                            naughty_ramanujan
6b6bb56464a9        docker/whalesay     "/bin/bash"              27 hours ago        Exited (0) 27 hours ago                            dreamy_gauss
3d0a99dfd9a4        hello-world         "/hello"                 27 hours ago        Exited (0) 27 hours ago                            frosty_hypatia

In other words, a list of all the containers in the Exited status .....

... and then parsing the returned list to ONLY give us the container ID: -

docker ps -a|grep Exit|awk '{print $1}'

e717fa412d6a
761e4ec73bb5
950cd9684ee6
d0d444d6f4f1
5c20a293793f
d67c6d05cc24
7507f0df1db9
77997983c07b
1b34cc7f227d
517237d924bf
6b6bb56464a9
3d0a99dfd9a4

Note that the grep pulls out everything with the word "Exit" thus ignoring the title line: -

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                         PORTS               NAMES

We can then feed that into AWK to give us the container IDs.

We then use the power of the back tick ( ` ) to allow us to run the docker rm command over the output from the previous command: -

rm `docker ps -a|grep Exit|awk '{print $1}'`

e717fa412d6a
761e4ec73bb5
950cd9684ee6
d0d444d6f4f1
5c20a293793f
d67c6d05cc24
7507f0df1db9
77997983c07b
1b34cc7f227d
517237d924bf
6b6bb56464a9
3d0a99dfd9a4

which clears the field: -

docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Nice !

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