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Update all docker images
Sometimes, there can be a need to pull latest images of all the docker images that we have in our installation. Unfortunately, docker does not provide a simple command for us to be able to update all the pulled docker images.
Luckily, with the power of bash, we will be able to accomplish this task. The command below will retrieve the images that we have in our installation and pull latest images from the docker repository.
docker images | grep -v REPOSITORY | awk '{print $1}' | xargs -L1 docker pull
Now, let’s break down what this command actually does. I’m not going to discuss in detail on what the | character is used for.
docker images
This command is used to list down all the images that we have in our docker installation. If you are used to docker, this should not be a surprise.
Below is the sample output of the command.
handra@nebula ~ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
postgres latest 817f2d3d51ec 2 days ago 314MB
primekey/ejbca-ce latest 996a15c0fb9a 5 days ago 623MB
pmlpostgres latest 3dc7d2347bb6 2 weeks ago 314MB
postgres <none> 62473370e7ee 6 weeks ago 314MB
confluentinc/ksqldb-examples 5.5.1 88f3d11247f3 3 months ago 646MB
confluentinc/cp-ksqldb-server 5.5.1 d2f03e1e91d8 3 months ago 679MB
confluentinc/cp-ksqldb-cli 5.5.1 c2768c7e4cc5 3 months ago 663MB
confluentinc/cp-kafka 5.5.1 3020f0651d7f 3 months ago 598MB
confluentinc/cp-schema-registry 5.5.1 f51e4f854dc1 3 months ago 1.19GB
confluentinc/cp-kafka-rest 5.5.1 2632bb34f956 3 months ago 1.15GB
confluentinc/cp-zookeeper 5.5.1 7149731cc563 3 months ago 598MB
cnfldemos/kafka-connect-datagen 0.3.2-5.5.0 002eda72fc69 4 months ago 1.24GB
devopsfaith/krakend latest c7e33ec819c0 6 months ago 145MB
grep -v REPOSITORY
This command is used to get all the lines output from the command docker images and filter only those lines that do not have keyword REPOSITORY.
Below is the sample output of the command.
handra@nebula ~ docker images | grep -v REPOSITORY
postgres latest 817f2d3d51ec 2 days ago 314MB
primekey/ejbca-ce latest 996a15c0fb9a 5 days ago 623MB
pmlpostgres latest 3dc7d2347bb6 2 weeks ago 314MB
postgres <none> 62473370e7ee 6 weeks ago 314MB
confluentinc/ksqldb-examples 5.5.1 88f3d11247f3 3 months ago 646MB
confluentinc/cp-ksqldb-server 5.5.1 d2f03e1e91d8 3 months ago 679MB
confluentinc/cp-ksqldb-cli 5.5.1 c2768c7e4cc5 3 months ago 663MB
confluentinc/cp-kafka 5.5.1 3020f0651d7f 3 months ago 598MB
confluentinc/cp-schema-registry 5.5.1 f51e4f854dc1 3 months ago 1.19GB
confluentinc/cp-kafka-rest 5.5.1 2632bb34f956 3 months ago 1.15GB
confluentinc/cp-zookeeper 5.5.1 7149731cc563 3 months ago 598MB
cnfldemos/kafka-connect-datagen 0.3.2-5.5.0 002eda72fc69 4 months ago 1.24GB
devopsfaith/krakend latest c7e33ec819c0 6 months ago 145MB
awk '{print $1}'
This command is used to print out only the first column of an input. In this case, the input comes from the output of the command grep -v REPOSITORY above.
Below is the sample output of the command.
handra@nebula ~ docker images | grep -v REPOSITORY | awk '{print $1}'
postgres
primekey/ejbca-ce
pmlpostgres
postgres
confluentinc/ksqldb-examples
confluentinc/cp-ksqldb-server
confluentinc/cp-ksqldb-cli
confluentinc/cp-kafka
confluentinc/cp-schema-registry
confluentinc/cp-kafka-rest
confluentinc/cp-zookeeper
cnfldemos/kafka-connect-datagen
devopsfaith/krakend
xargs -L1 docker pull
This command is used to execute a command, which in this case is docker pull by reading the lines one by one.
That’s it. I hope it helps anyone in updating all of your docker images in one simple command line.
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