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#!/bin/bash
true
SCRIPT_NAME="Change to Docker overlay2"
# shellcheck source=lib.sh
source /var/scripts/fetch_lib.sh || source <(curl -sL https://raw.githubusercontent.com/nextcloud/vm/master/lib.sh)
# T&M Hansson IT AB © - 2020, https://www.hanssonit.se/
# Check for errors + debug code and abort if something isn't right
# 1 = ON
# 0 = OFF
DEBUG=0
debug_mode
# Must be root
root_check
### Migrating Docker images to overlay2 ###
# https://www.techandme.se/changes-to-docker-ce-in-the-nextcloud-vm/
# Credits to: https://gist.github.com/hydra1983/22b2bed38b4f5f56caa87c830c96378d
# Make sure DOCKERBACKUP is created
if [ -f "$NCPATH"/config/config.php ]
then
NCDATA="$(grep 'datadir' "$NCPATH"/config/config.php | awk '{print $3}' | cut -d "'" -f2)"
fi
DOCKERBACKUP="$NCDATA/DOCKERBACKUP"
mkdir -p "$DOCKERBACKUP"
# Check if aufs and don't run
if grep -q "aufs" /etc/default/docker
then
msg_box "This script doesn't support images that uses the AUFS driver, sorry
You are welcome to send a PR, or report an issue here: $ISSUES"
exit 1
fi
readonly DB_FILE="$DOCKERBACKUP/images.db"
readonly IMG_DIR="$DOCKERBACKUP/images"
save_images() {
print_text_in_color "$ICyan" "Create ${IMG_DIR}"
if [[ ! -d "${IMG_DIR}" ]]; then
mkdir "${IMG_DIR}"
fi
print_text_in_color "$ICyan" "Create ${DB_FILE}"
docker images|grep -v 'IMAGE ID'|awk '{printf("%s %s %s\n", $1, $2, $3)}'|column -t > "${DB_FILE}"
print_text_in_color "$ICyan" "Read ${DB_FILE}"
local images
while read -r image; do
images+=("$image");
done <<< "$(cat "${DB_FILE}")"
local name tag id
for image in "${images[@]}"; do
name=$(echo "$image"|awk '{print $1}')
tag=$(echo "$image"|awk '{print $2}')
id=$(echo "$image"|awk '{print $3}')
if [[ "${id}" != "" ]]; then
local imgPath="${IMG_DIR}/${id}.dim"
if [[ ! -f "${imgPath}" ]] ; then
print_text_in_color "$ICyan" "[DEBUG] save ${id} ${name}:${tag} to ${imgPath}"
(time docker save -o "${imgPath}" "${name}":"${tag}") 2>&1 | grep real
else
print_text_in_color "$ICyan" "[DEBUG] ${id} ${name}:${tag} already saved"
fi
fi
done
}
load_images() {
if [[ ! -f "${DB_FILE}" ]]; then
print_text_in_color "$ICyan" "No ${DB_FILE} to read"
exit 0
fi
if [[ ! -d "${IMG_DIR}" ]]; then
print_text_in_color "$ICyan" "No ${IMG_DIR} to load images"
exit 0
fi
print_text_in_color "$ICyan" "Read ${DB_FILE}"
local images
while read -r image; do
images+=("$image");
done <<< "$(cat "${DB_FILE}")"
local name tag id
for image in "${images[@]}"; do
name=$(echo "$image"|awk '{print $1}')
tag=$(echo "$image"|awk '{print $2}')
id=$(echo "$image"|awk '{print $3}')
if [[ "${id}" != "" ]]; then
local imgPath="${IMG_DIR}/${id}.dim"
if [[ "$(docker images|grep "${id}" | grep "${name}" | grep "${tag}")" == "" ]]; then
if [[ "$(docker images|grep "${id}")" == "" ]]; then
print_text_in_color "$ICyan" "[DEBUG] load ${id} ${name}:${tag} from ${imgPath}"
docker load -i "${imgPath}"
else
print_text_in_color "$ICyan" "[DEBUG] tag ${id} as ${name}:${tag}"
docker tag "${id}" "${name}":"${tag}"
fi
else
print_text_in_color "$ICyan" "[DEBUG] ${id} ${name}:${tag} already loaded"
fi
fi
done
}
# Save all docker images in one file
check_command docker ps -a > "$DOCKERBACKUP"/dockerps.txt
check_command docker images | sed '1d' | awk '{print $1 " " $2 " " $3}' > "$DOCKERBACKUP"/mydockersimages.list
msg_box "The following images will be saved to $DOCKERBACKUP/images
$(cat "$DOCKERBACKUP"/mydockersimages.list)
It may take a while so please be patient."
check_command save_images
# Set overlay2
print_text_in_color "$ICyan" "Setting overlay2 in /etc/docker/daemon.json"
cat << OVERLAY2 > /etc/docker/daemon.json
{
"storage-driver": "overlay2"
}
OVERLAY2
rm -f /etc/systemd/system/docker.service
systemctl restart docker.service
print_text_in_color "$ICyan" "Reloading daemon"
systemctl daemon-reload
print_text_in_color "$ICyan" "Restarting the docker service"
check_command systemctl restart docker.service
apt-mark unhold docker-ce
# Remove old cached versions to avoid failures on update to new version
rm -Rf /var/cache/apt/archives/docker*
rm -Rf /var/cache/apt/archives/container*
rm -Rf /var/cache/apt/archives/aufs*
# Upgrade docker to latest version
rm -Rf /var/lib/docker
apt update -q4 & spinner_loading
apt upgrade docker-ce -y
# Load docker images back
print_text_in_color "$ICyan" "Importing saved docker images to overlay2..."
check_command load_images
msg_box "Your Docker images are now imported to overlay2, but not yet running.
To start the images again, please run the appropriate 'docker run' command for each docker.
These are all the imported docker images:
$(cat "${DB_FILE}")
You can also find the file with the imported docker images here:
$DB_FILE
If you experiance any issues, please report them to $ISSUES."
rm -f "$DOCKERBACKUP"/mydockersimages.list
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