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@@ -1,8 +1,19 @@
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#!/bin/bash
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##Script to update Docker container images occasionally and alert when update is done.
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## This script is a helper script to automatically update Docker containers in a less aggressive way than
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#+ existing solutions. It avoids database upgrades and generates its' log in a Prometheus-ready template,
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#+ which enables generation of Prometheus alerts when a container is updated, or fails to update.
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## The process:
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#+ 1. Iterate over the primary container directory and search for Docker stacks
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#+ 2. For each Docker stack found, iterate over the images and get their checksum
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#+ 3. For each image found, login to docker.io and get the remote checksum
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#+ (new repositories, such as quay.io and ghcr.io will be added in the future, if needed)
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#+ 4. Compare the checksums. If they differ (assumed newer), pull the remote image
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#+ 5. Bring the stack up with the new image
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##
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#+ The key outcomes of this process (container updated, failed to update, update status undetermined)
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#+ Are written to a file monitored by Prometheus. Based on the code assigned to each, Prometheus
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#+ sends out an alert (container xyz has been updated, etc).
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#This is where containers live
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CONTAINER_DIR="/var/Red-Vol/Media/Containers/"
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show_help()
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@@ -12,7 +23,8 @@ show_help()
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echo " {-h|--help} -- Print this help message and exit"
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exit 0
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}
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#Pass arguments to the script
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# Pass arguments to the script
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flags()
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{
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while test $# -gt 0
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@@ -24,7 +36,7 @@ flags()
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if [[ -d $CONTAINER_DIR/$1 ]]; then
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export CONTAINER_PATHS="$CONTAINER_DIR/$1"
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else
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CONTAINER_PATHS="$(find /var/Red-Vol/Media/Containers/ -maxdepth 1 -type d -name "*$1*" | head -1)"
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CONTAINER_PATHS="$(find $CONTAINER_DIR -maxdepth 1 -type d -name "*$1*" | head -1)"
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if [[ -n $CONTAINER_PATHS ]]; then
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export CONTAINER_PATHS
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fi
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@@ -42,32 +54,38 @@ flags()
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}
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flags "$@"
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## Defaults
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# Directory to search for stacks
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CONTAINER_DIR="/some/container/path/"
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#Remember where you are to change back to later
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LOCAL_DIR=`pwd`
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#File to write results to; picked up by Prometheus and yells about changes
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# File to write results to; picked up by Prometheus and yells about changes
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PROM_FILE="$CONTAINER_DIR/prometheus/data/hatarashi-hako.prom"
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#Remove log from last runs, if present
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# Remove log from last runs, if present
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if [[ -f $PROM_FILE ]]; then
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rm $PROM_FILE
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fi
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#Check if path is already set by user specified stack; otherwise, find all containers.
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# Remember initial execution directory, to return to after the script has finished
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LOCAL_DIR=`pwd`
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# Check if path is already set by user specified stack (-s, --stack); otherwise, find all containers.
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if [[ -z $CONTAINER_PATHS ]]; then
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CONTAINER_PATHS=$(find $CONTAINER_DIR -maxdepth 2 -type f -name docker-compose.yml ! -path '*Archive*' | xargs dirname )
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# Find containers in ^ base dir ^ in base container path ^ by finding compose files ^ (not here) ^ and getting their directory name.
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fi
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#Find containers in ^ base dir ^ in base container path ^ by finding compose files ^ (not here) ^ and getting their directory name.
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for container_path in ${CONTAINER_PATHS[@]}; do
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cd $container_path
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echo -e "Working on container directory" "$container_path"
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container_stack=$(basename $container_path)
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echo -e "Working on stack" "$container_stack"
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#It's deadly to update tagless database images; this line is safe because it only catches tagged images.
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# It's deadly to update tagless database images; this line is safe because it only catches tagged images.
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container_images="$(cat $container_path/docker-compose.yml | grep -E "image: ([a-z]+)((/)|(:))([a-z]+)?(:)?([a-z0-9].*$)?" | awk '{print $2}')"
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# search for a pattern of something:something with optional :tag print ^ image name
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for container_image in $container_images; do
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echo -e "$container_stack has image" "$container_image"
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echo -e "echo $container_image | awk -F/ '{print \$2}' | sed 's/\:.*//'"
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@@ -77,6 +95,7 @@ for container_path in ${CONTAINER_PATHS[@]}; do
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export container_name="$container_image"
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fi
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echo -e "$container_image has name" "$container_name"
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if [[ -n $(echo $container_image | grep -E "(.*:[a-z0-9].*$)") ]]; then
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# check if there is a :tag present ^
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image_tag=":$(echo $container_image | awk -F: '{print $NF}')"
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@@ -87,6 +106,7 @@ for container_path in ${CONTAINER_PATHS[@]}; do
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export container_name=$(echo $container_name | awk -F: '{print $1}')
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fi
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echo -e "Fetching local image checksum with:" "docker inspect \"$container_image$image_tag\" | grep -Eo \"($container_image@)?sha256:([0-9a-zA-Z].*)(\\\")\" | sed -e 's/\"//g' | awk -F@ '{print \$2}"
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local_image=$(docker inspect "$container_image$image_tag" | grep -Eo "($container_image@)?sha256:([0-9a-zA-Z].*)(\")" | sed -e 's/"//g' -e 's/\s+//g' | awk -F@ '{print $2}')
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# remember, this bit ^ is empty without an image ^ this is the main image checksum remove ^ " and whitespace and^ get the checksum after the @
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if [[ -z $local_image ]]; then
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@@ -97,14 +117,16 @@ for container_path in ${CONTAINER_PATHS[@]}; do
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else
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echo -e "Local SHA256 for $container_image is" "$local_image"
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fi
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echo -e "Fetching remote image with:" "skopeo inspect --creds \"dkd6:$PASS\" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(\")' | sed -e 's/\"//g'"
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echo -e "Fetching remote image with:" "skopeo inspect --creds \"$SKOPEO_USER:$PASS\" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(\")' | sed -e 's/\"//g'"
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#Use Skopeo, a Red Hat tool, with my Docker Hub account to register the remote image checksum
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remote_image=$(skopeo inspect --creds "dkd6:$PASS" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(")' | sed -e 's/"//g' -e 's/\s+//g' )
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remote_image=$(skopeo inspect --creds "$SKOPEO_USER:$PASS" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(")' | sed -e 's/"//g' -e 's/\s+//g' )
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#Sometimes; Docker hub hangs up; try again if you failed
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if [[ -z $remote_image ]]; then
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remote_image=$(skopeo inspect --creds "dkd6:$PASS" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(")' | sed -e 's/"//g')
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remote_image=$(skopeo inspect --creds "$SKOPEO_USER:$PASS" docker://docker.io/$container_image$image_tag | grep Digest | head -1 | grep -Eo 'sha256:([0-9a-zA-Z].*)(")' | sed -e 's/"//g')
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fi
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#Now, if you still don't have an image after the second try, something's fuckey.
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#Now, if you still don't have an image after the second try, something's up.
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if [[ -z $remote_image ]]; then
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echo -e "Error fetching remote image checksum for container" "$container_name!"
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echo "container_updated{name=\"$container_name\"} -1" >> $PROM_FILE
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@@ -112,6 +134,7 @@ for container_path in ${CONTAINER_PATHS[@]}; do
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else
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echo -e "Remote SHA256 for $container_image is" "$remote_image"
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fi
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#If we have both checksums, compare them; they should be identical, or the container is outdated.
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if [[ -n $local_image ]] && [[ -n $remote_image ]] && [[ "$local_image" =~ "$remote_image" ]]; then
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echo -e "$container_name" "is up to date!"
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