152 lines
No EOL
4 KiB
Bash
Executable file
152 lines
No EOL
4 KiB
Bash
Executable file
#!/usr/bin/env bash
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# usage
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usage() {
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USAGE=$(cat <<EOF
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Usage: docker_check [CONFIG_FILE (absolute path)]
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If no CONFIG_FILE is given, HOME/.docker_check.conf is used. This fallback option
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has to exist or the script will exit.
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Configuration can be done in any file and any pre-defined variable can be overwritten.
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The following are optional or have reasonable defaults:
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DOCKER_CHECK_LIST_FILE="HOME/.docker_check.list" // the list file (output current running to file: docker ps --format '{{.Names}}' >> $HOME/.docker_check.list)
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DOCKER_CHECK_NOTIFY_LEVELS=("UNKNOWN" "WARNING" "CRITICAL") // when to notify/output/send mail. possible: "UNKNOWN" "WARNING" "CRITICAL" "INFO", should at least be ()
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DOCKER_CHECK_MAIL_ENABLED=false // send email (address has to be set), values: false|true
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DOCKER_CHECK_MAIL_ADDRESS="" // mail.rc has to be configured
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You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
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EOF
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)
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echo "$USAGE";
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}
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set -e;
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HOSTNAME=$(hostname)
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DOCKER_CHECK_LIST_FILE="$HOME/.docker_check.list"
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DOCKER_CHECK_NOTIFY_LEVELS=("UNKNOWN" "WARNING" "CRITICAL")
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DOCKER_CHECK_MAIL_ENABLED=false
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DOCKER_CHECK_MAIL_ADDRESS=""
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CONTAINERS=()
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# check for config file
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source_config() {
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local config=$1;
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local configFallback=$2;
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if [[ ! -f "$config" ]]; then
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if [[ ! -f "$configFallback" ]]; then
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echo "No config file specified and could not find default in '$configFallback'!";
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echo "";
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usage;
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exit 1;
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else
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config=$configFallback;
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fi
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fi
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set -a;
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source "$config";
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set +a;
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}
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source_config "$1" "$HOME/.docker_check.conf"
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if [ ! -f $DOCKER_CHECK_LIST_FILE ]; then
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echo "$DOCKER_CHECK_LIST_FILE doesn't exist. Add a file which holds one docker container per line.";
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echo "";
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usage;
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exit 1;
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fi
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echo "Scanning $DOCKER_CHECK_LIST_FILE for containers...";
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while IFS='' read -r line || [[ -n "$line" ]]; do
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CONTAINERS+=("$line")
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echo "-> Found $line";
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done < "$DOCKER_CHECK_LIST_FILE"
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# check if current status is in array of DOCKER_CHECK_NOTIFY_LEVELS
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function shouldLog() {
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local VALUE=$1;
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for i in "${DOCKER_CHECK_NOTIFY_LEVELS[@]}"; do
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if [ "$i" == "$VALUE" ] ; then
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echo true;
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return;
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fi
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done
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echo false;
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}
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# log and send mail if enabled
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function log() {
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local CONTAINER=$1;
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local STATUS=$2;
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local MESSAGE=$3;
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local SHOULD_LOG=$(shouldLog "$STATUS");
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if [ "$SHOULD_LOG" = "true" ]; then
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local SUBJECT="[docker $HOSTNAME] $STATUS $CONTAINER";
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echo "$SUBJECT: $MESSAGE";
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if [ "$DOCKER_CHECK_MAIL_ENABLED" = true ]; then
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echo $MESSAGE|mailx -Ssendwait -s "$SUBJECT" $DOCKER_CHECK_MAIL_ADDRESS;
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fi
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fi
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}
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# get status for a docker container
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function checkContainer() {
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local CONTAINER=$1;
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if [ "x${CONTAINER}" == "x" ]; then
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log "$CONTAINER" "UNKNOWN" "Container ID or Friendly Name Required"
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return;
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fi
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if [ "x$(which docker)" == "x" ]; then
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log "$CONTAINER" "UNKNOWN" "Missing docker binary"
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return;
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fi
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docker info > /dev/null 2>&1
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if [ $? -ne 0 ]; then
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log "$CONTAINER" "UNKNOWN" "Unable to talk to the docker daemon"
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return;
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fi
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RUNNING=$(docker inspect --format="{{.State.Running}}" $CONTAINER 2> /dev/null)
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if [ $? -eq 1 ]; then
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log "$CONTAINER" "UNKNOWN" "$CONTAINER does not exist."
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return;
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fi
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if [ "$RUNNING" == "false" ]; then
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log "$CONTAINER" "CRITICAL" "$CONTAINER is not running."
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return;
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fi
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RESTARTING=$(docker inspect --format="{{.State.Restarting}}" $CONTAINER)
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if [ "$RESTARTING" == "true" ]; then
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log "$CONTAINER" "WARNING" "$CONTAINER state is restarting."
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return;
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fi
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#STARTED=$(docker inspect --format="{{.State.StartedAt}}" $CONTAINER)
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#NETWORK=$(docker inspect --format="{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}" $CONTAINER)
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#log "$CONTAINER" "INFO" "$CONTAINER is running. IP: $NETWORK, StartedAt: $STARTED"
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log "$CONTAINER" "INFO" "$CONTAINER is running."
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return;
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}
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# execute check for defined containers
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for container in "${CONTAINERS[@]}"; do
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echo "Checking $container...";
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checkContainer "$container"
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done |