Initial commmit

Just proof of concept, so far no alerting

Dockerfile

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+FROM alpine:latest
+
+ENV DOCKERIZE_VERSION v0.7.0
+
+WORKDIR /app
+
+COPY *.sh ./
+
+RUN apk update --no-cache \
+    && apk add --no-cache bash curl jq openssl \
+    && curl -s -L https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz | tar xzf - -C .
+
+HEALTHCHECK \
+    --interval=10s \
+    --timeout=301s \
+    --retries=2 \
+    --start-period=300s \
+    CMD ./docker-healthcheck.sh
+
+CMD ["./docker-cmd.sh"]

config.sh

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+OK_FILE="/tmp/ok"
+LOGGER_USE_TS=1
+SCRIPT_NAME=${0##*/}

docker-cmd.sh

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+#!/usr/bin/env bash
+
+source ./config.sh
+source ./logger.sh
+
+SLEEP=${SLEEP-10s}
+
+function get_cmd() {
+    cmd=(./dockerize -timeout 300s -wait-retry-interval 5s)
+    while read SERVICE; do
+        cmd+=(-wait $SERVICE)
+    done < <(./services.sh)
+    cmd+=(touch $OK_FILE)
+    echo ${cmd[@]}
+}
+
+log_info "Entering loop with ${SLEEP} sleep ..."
+
+while true; do
+    eval $(get_cmd)
+    if [ -f $OK_FILE ]; then
+        log_info OK
+        sleep $SLEEP
+        rm -f $OK_FILE
+    else
+        log_error TIMEOUT
+    fi
+done

docker-healthcheck.sh

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+#!/usr/bin/env bash
+
+LOOP_SLEEP=${LOOP_SLEEP-60s}
+
+source ./config.sh
+source ./logger.sh
+
+log_info "Using email: $CERTBOT_EMAIL"
+log_info "Initial list of domains from certbot.domain labels ..."
+./domains.sh
+
+LAST_DATE=$(date +"%Y-%m-%d")
+
+log_info "Entering loop with $LOOP_SLEEP sleep ..."
+while true; do
+    sleep $LOOP_SLEEP
+
+    NEW_DATE=$(date +"%Y-%m-%d")
+
+    if [[ $LAST_DATE != $NEW_DATE ]]; then
+        LAST_DATE=$NEW_DATE
+        log_info "New date detected renewing ..."
+        ./renew.sh
+    else
+        ./issue.sh
+    fi
+done

logger.sh

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+log() {
+    local level color message
+    level=$1
+    message=$2
+
+    case "$level" in
+        INFO)
+            color=$'\e[36m'
+            ;;
+        WARNING)
+            color=$'\e[35m'
+            ;;
+        ERROR)
+            color=$'\e[31m'
+            ;;
+        *)
+            color=$'\e[39m'
+            ;;
+    esac
+
+    reset=$'\e[39m'
+    if [[ -n $LOGGER_USE_TS ]]; then
+        timestamp=$(date +"%Y-%m-%d %H:%M:%S|")
+    else
+        timestamp=""
+    fi
+
+    if [[ -t 1 || -n $CONTENT_TYPE ]]; then
+        echo -e "${color}-${level:0:1}|${timestamp}${message}${reset}"
+    else
+        echo "-${level:0:1}|${timestamp}${message}"
+    fi
+
+    logger -t $SCRIPT_NAME -p user.${level,,} "${level} - ${message}"
+}
+
+log_info() {
+    log "INFO" "$1"
+}
+
+log_warn() {
+    log "WARNING" "$1"
+}
+
+log_error() {
+    log "ERROR" "$1"
+}

services.sh

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+#!/usr/bin/env bash
+
+SOCK=/var/run/docker.sock
+URL=http://v1.45/services
+
+LABEL="swarm-health-alerter.port"
+
+function get_services() {
+    curl -s --unix-socket $SOCK $URL \
+        | jq -r '.[] | select(.Spec.Labels["com.docker.stack.namespace"] != null) | .Spec.Name'
+}
+
+while read service; do
+    ports=$(curl -s --unix-socket $SOCK $URL/$service | jq -r '.Spec.Labels["'$LABEL'"]')
+    test "$ports" != "null" || continue
+    network_alias=$(curl -s --unix-socket $SOCK $URL/$service | jq -r '.Spec.TaskTemplate.Networks[].Aliases[]' | sort | head -1)
+    echo $ports | sed 's/,/\n/g' | while read port; do echo "tcp://$network_alias:$port"; done
+done < <(get_services)