script to save all docker image, and load them back

save-all-images.sh

reload() {
  source ${BASH_SOURCE[0]}
}
alias r=reload

get-image-field() {
  local imageId=$1
  local field=$2
  : ${imageId:? reuired}
  : ${field:? required}

  docker images --no-trunc|sed -n "/${imageId}/ s/ \+/ /gp"|cut -d" " -f $field
}

get-image-name() {
  get-image-field $1 1
}

get-image-tag() {
  get-image-field $1 2
}

save-all-image() {
  local ids=$(docker images -q)
  local name safename tag

  for id in $ids; do
    name=$(get-image-name $id)
    tag=$(get-image-tag $id)
    if [[  $name =~ / ]] ; then
       dir=${name%/*}
       mkdir -p $dir
    fi
    echo [DEBUG] save $name:$tag ...
    (time  docker save -o $name.$tag.dim $name:$tag) 2>&1|grep real
  done
}

load-all-image() {
  local name safename noextension tag

  for image in $(find . -name \*.dim); do
    echo [DEBUG] load
    tar -Oxf $image repositories
    echo
    docker load -i $image
  done
}

seems broken?

Looks ok to me. I just tried it (granted, I only "saved" and not "loaded").

worked

I only made one modification and added use instructions to call the functions as arguments:

[root@localhost ~]# cat docker_images.sh

How to used

save images

./docker_images.sh save-all

restore images

./docker_images.sh load-all

reload() {
source ${BASH_SOURCE[0]}
}
alias r=reload

get-image-field() {
local imageId=$1
local field=$2
: ${imageId:? reuired}
: ${field:? required}

docker images --no-trunc|sed -n "/${imageId}/ s/ +/ /gp"|cut -d" " -f $field
}

get-image-name() {
get-image-field $1 1
}

get-image-tag() {
get-image-field $1 2
}

save-all() {
local ids=$(docker images -q)
local name safename tag

for id in $ids; do
name=$(get-image-name $id)
tag=$(get-image-tag $id)
if [[ $name =~ / ]] ; then
dir=${name%/*}
mkdir -p $dir
fi
echo [DEBUG] save $name:$tag ...
(time docker save -o $name.$tag.dim $name:$tag) 2>&1|grep real
done
}

load-all() {
local name safename noextension tag

for image in $(find . -name *.dim); do
echo [DEBUG] load
tar -Oxf $image repositories
echo
docker load -i $image
done
}
$@

See https://gist.github.com/hydra1983/22b2bed38b4f5f56caa87c830c96378d