mirror of
https://github.com/projectatomic/atomic.git
synced 2026-02-05 09:44:59 +01:00
23c044303c
Signed-off-by: Shishir Mahajan <shishir.mahajan@redhat.com> Closes: #542 Approved by: giuseppe
221 lines
7.2 KiB
Bash
Executable File
221 lines
7.2 KiB
Bash
Executable File
#!/bin/bash
|
|
# bash script to migrate containers from one backend storage to another.
|
|
set -e
|
|
|
|
ATOMIC_LIBEXEC="${ATOMIC_LIBEXEC-/usr/libexec/atomic}"
|
|
GOTAR="$ATOMIC_LIBEXEC/gotar"
|
|
|
|
main() {
|
|
if [ $(id -u) != 0 ];then
|
|
echo "Run 'migrate' as root user"
|
|
exit
|
|
fi
|
|
|
|
NUMARGS=$#
|
|
|
|
if [ $NUMARGS -eq 0 ] || [ "$1" = "--help" ];then
|
|
echo "Usage: migrate COMMAND [ARGS] [OPTIONS]
|
|
migrate [--help]
|
|
|
|
A self-sufficient tool for migrating docker containers from one backend storage to another
|
|
|
|
Commands:
|
|
export Export a container from an existing storage
|
|
import Import a container into a new storage"
|
|
exit
|
|
fi
|
|
|
|
if [ "$1" = "export" ];then
|
|
if [ -z "$2" ]; then
|
|
echo "migrate: "export" requires a minimum of 1 argument.
|
|
See 'migrate export --help'
|
|
|
|
Usage: migrate export CONTAINER-ID [OPTIONS]
|
|
|
|
Export a container from an existing storage"
|
|
exit
|
|
elif [ "$2" = "--help" ];then
|
|
echo "
|
|
Usage: migrate export CONTAINER-ID [OPTIONS]
|
|
|
|
Export a container from an existing storage
|
|
|
|
--graph Root of the Docker runtime (Default: /var/lib/docker)
|
|
--export-location Path for exporting the container (Default: /var/lib/atomic/migrate/containers)"
|
|
exit
|
|
else
|
|
container_export $2 $3 $4
|
|
fi
|
|
fi
|
|
|
|
if [ "$1" = "import" ];then
|
|
if [ -z "$2" ]; then
|
|
echo "migrate: "import" requires a minimum of 1 argument.
|
|
See 'migrate import --help'
|
|
|
|
Usage: migrate import CONTAINER-ID [OPTIONS]
|
|
|
|
Import a container into a new storage"
|
|
exit
|
|
elif [ "$2" = "--help" ];then
|
|
echo "
|
|
Usage: migrate import CONTAINER-ID [OPTIONS]
|
|
|
|
Import a container into a new storage
|
|
|
|
--graph Root of the Docker runtime (Default: /var/lib/docker)
|
|
--import-location Path for importing the container (Default: /var/lib/atomic/migrate/containers)"
|
|
exit
|
|
else
|
|
container_import $2 $3 $4
|
|
fi
|
|
fi
|
|
|
|
}
|
|
|
|
get_docker_pid() {
|
|
if ! systemctl is-active docker >/dev/null; then
|
|
echo "Docker daemon is not running"
|
|
exit 1
|
|
fi
|
|
|
|
pid=$(systemctl show -p MainPID docker.service)
|
|
echo ${pid#*=}
|
|
}
|
|
|
|
container_export(){
|
|
for arg in "$@"
|
|
do
|
|
flag=$(echo $arg|cut -d'=' -f 1)
|
|
val=$(echo $arg|cut -d'=' -f 2)
|
|
case "$flag" in
|
|
--container-id)
|
|
containerID=$val
|
|
;;
|
|
--graph)
|
|
dockerRootDir=$val
|
|
;;
|
|
--export-location)
|
|
exportPath=$val
|
|
;;
|
|
esac
|
|
done
|
|
|
|
if [ -z "$containerID" ]; then
|
|
echo "--container-id cannot be null"
|
|
exit 1
|
|
fi
|
|
|
|
if [ -z "$exportPath" ]; then
|
|
exportPath="/var/lib/atomic/migrate"
|
|
fi
|
|
|
|
dockerPid=$(get_docker_pid)
|
|
dockerCmdline=$(cat /proc/$dockerPid/cmdline)||exit 1
|
|
if [[ $dockerCmdline =~ "-g=" ]] || [[ $dockerCmdline =~ "-g/" ]] || [[ $dockerCmdline =~ "--graph" ]];then
|
|
if [ -z "$dockerRootDir" ] || [ $dockerRootDir = "/var/lib/docker" ];then
|
|
echo "Docker is not located at the default (/var/lib/docker) root location."
|
|
echo "Please provide the new root location of the docker runtime in --graph option."
|
|
exit 1
|
|
fi
|
|
else
|
|
dockerRootDir="/var/lib/docker"
|
|
fi
|
|
notruncContainerID=$(docker ps -aq --no-trunc|grep $containerID)||exit 1
|
|
tmpDir=$exportPath/containers/migrate-$containerID
|
|
mkdir -p $tmpDir
|
|
cd $tmpDir
|
|
containerBaseImageID=$(docker inspect --format '{{.Image}}' $containerID)||exit 1
|
|
echo $dockerRootDir>containerInfo.txt
|
|
echo $containerBaseImageID>>containerInfo.txt
|
|
echo $notruncContainerID>>containerInfo.txt
|
|
"$GOTAR" -cf container-metadata.tar $dockerRootDir/containers/$notruncContainerID 2> /dev/null
|
|
if [[ ! -z $(docker diff $containerID) ]];then
|
|
imageName=$(echo $RANDOM)
|
|
docker commit $containerID $imageName 1>/dev/null||exit 1
|
|
mkdir -p $tmpDir/temp
|
|
docker save $imageName > $tmpDir/temp/image.tar||exit 1
|
|
$(cd $tmpDir/temp; "$GOTAR" -xf image.tar)
|
|
diffLayerID=$(python -c 'import json; f=open("temp/repositories"); j=json.load(f); print(j[j.keys()[0]]["latest"])')
|
|
cd $tmpDir/temp/$diffLayerID
|
|
cp layer.tar $tmpDir/container-diff.tar
|
|
cd $tmpDir
|
|
/usr/bin/tar --delete -f container-diff.tar run/gotar 2>/dev/null || true
|
|
rm -rf temp
|
|
docker rmi -f $imageName 1>/dev/null||exit 1
|
|
fi
|
|
}
|
|
|
|
container_import(){
|
|
for arg in "$@"
|
|
do
|
|
flag=$(echo $arg|cut -d'=' -f 1)
|
|
val=$(echo $arg|cut -d'=' -f 2)
|
|
case "$flag" in
|
|
--container-id)
|
|
containerID=$val
|
|
;;
|
|
--graph)
|
|
dockerRootDir=$val
|
|
;;
|
|
--import-location)
|
|
importPath=$val
|
|
;;
|
|
esac
|
|
done
|
|
|
|
if [ -z "$containerID" ]; then
|
|
echo "--container-id cannot be null"
|
|
exit
|
|
fi
|
|
|
|
if [ -z "$importPath" ]; then
|
|
importPath="/var/lib/atomic/migrate"
|
|
fi
|
|
|
|
dockerPid=$(get_docker_pid)
|
|
dockerCmdline=$(cat /proc/$dockerPid/cmdline)||exit 1
|
|
if [[ $dockerCmdline =~ "-g=" ]] || [[ $dockerCmdline =~ "-g/" ]] || [[ $dockerCmdline =~ "--graph" ]];then
|
|
if [ -z "$dockerRootDir" ] || [ $dockerRootDir = "/var/lib/docker" ];then
|
|
echo "Docker is not located at the default (/var/lib/docker) root location."
|
|
echo "Please provide the new root location of the docker runtime in --graph option."
|
|
exit 1
|
|
fi
|
|
else
|
|
dockerRootDir="/var/lib/docker"
|
|
fi
|
|
|
|
cd $importPath/containers/migrate-$containerID
|
|
dockerBaseImageID=$(sed -n '2p' containerInfo.txt)||exit 1
|
|
if [[ -f container-diff.tar ]];then
|
|
cat container-diff.tar|docker run -i -v "$GOTAR:/run/gotar" $dockerBaseImageID /run/gotar -xf -
|
|
else
|
|
docker run -i $dockerBaseImageID echo "container_import"
|
|
fi
|
|
newContainerID=$(docker ps -lq)||exit 1
|
|
newContainerName=$(docker inspect -f '{{.Name}}' $newContainerID)||exit 1
|
|
newNotruncContainerID=$(docker ps -aq --no-trunc|grep $newContainerID)||exit 1
|
|
cd $dockerRootDir/containers/$newNotruncContainerID
|
|
rm -rf *
|
|
cp $importPath/containers/migrate-$containerID/container-metadata.tar .
|
|
"$GOTAR" -xf container-metadata.tar
|
|
rm container-metadata.tar
|
|
oldDockerRootDir=$(sed -n '1p' $importPath/containers/migrate-$containerID/containerInfo.txt)||exit 1
|
|
oldNotruncContainerID=$(sed -n '3p' $importPath/containers/migrate-$containerID/containerInfo.txt)||exit 1
|
|
cp -r ${oldDockerRootDir:1}/containers/$oldNotruncContainerID/* .
|
|
baseDir=$(echo $oldDockerRootDir|cut -d"/" -f 2)
|
|
rm -rf $baseDir
|
|
|
|
oldStorageDriver=$(sed -n '1p' $importPath/info.txt)||exit 1
|
|
newStorageDriver=$(docker info|grep "Storage Driver"|cut -d" " -f 3)
|
|
|
|
sed -i "s|\"Driver\":\"$oldStorageDriver\"|\"Driver\":\"$newStorageDriver\"|g" config.v2.json
|
|
sed -i "s|$oldDockerRootDir/containers/$oldNotruncContainerID|$dockerRootDir/containers/$oldNotruncContainerID|g" config.v2.json
|
|
|
|
cd $dockerRootDir
|
|
find . -name "*$newNotruncContainerID*" -type d -exec rename $newNotruncContainerID $oldNotruncContainerID {} +
|
|
find . -name "*$newNotruncContainerID*" -type f -exec rename $newNotruncContainerID $oldNotruncContainerID {} +
|
|
}
|
|
|
|
main "$@"
|