diff --git a/Dockerfile b/Dockerfile index 18be414..1485535 100644 --- a/Dockerfile +++ b/Dockerfile @@ -10,7 +10,8 @@ ENV AUTOHEAL_CONTAINER_LABEL=autoheal \ AUTOHEAL_INTERVAL=5 \ AUTOHEAL_DEFAULT_STOP_TIMEOUT=10 \ DOCKER_SOCK=/var/run/docker.sock \ - CURL_TIMEOUT=30 + CURL_TIMEOUT=30 \ + WEBHOOK_URL="" HEALTHCHECK --interval=5s CMD pgrep -f autoheal || exit 1 diff --git a/README.md b/README.md index 3a749db..f9bcdcb 100644 --- a/README.md +++ b/README.md @@ -60,6 +60,7 @@ AUTOHEAL_START_PERIOD=0 # wait 0 seconds before first health check AUTOHEAL_DEFAULT_STOP_TIMEOUT=10 # Docker waits max 10 seconds (the Docker default) for a container to stop before killing during restarts (container overridable via label, see below) DOCKER_SOCK=/var/run/docker.sock # Unix socket for curl requests to Docker API CURL_TIMEOUT=30 # --max-time seconds for curl requests to Docker API +WEBHOOK_URL="" # post message to the webhook if a container was restarted (or restart failed) ``` ### Optional Container Labels diff --git a/docker-entrypoint b/docker-entrypoint index 96b494f..eb482bf 100755 --- a/docker-entrypoint +++ b/docker-entrypoint @@ -7,6 +7,7 @@ set -o pipefail DOCKER_SOCK=${DOCKER_SOCK:-/var/run/docker.sock} UNIX_SOCK="" CURL_TIMEOUT=${CURL_TIMEOUT:-30} +WEBHOOK_URL=${WEBHOOK_URL:-""} # only use unix domain socket if no TCP endpoint is defined case "${DOCKER_SOCK}" in @@ -56,6 +57,26 @@ restart_container() { docker_curl -f -X POST "${HTTP_ENDPOINT}/containers/${container_id}/restart?t=${timeout}" } +notify_webhook() { + local text="$@" + + if [ -n "$WEBHOOK_URL" ] + then + # execute webhook requests as background process to prevent healer from blocking + curl -X POST -H "Content-type: application/json" -d "$(generate_webhook_payload $text)" $WEBHOOK_URL + fi +} + +# https://towardsdatascience.com/proper-ways-to-pass-environment-variables-in-json-for-curl-post-f797d2698bf3 +generate_webhook_payload() { + local text="$@" + cat <&2 + notify_webhook "Container ${CONTAINER_NAME:1} (${CONTAINER_SHORT_ID}) found to be unhealthy. Failed to restart the container!" & + else + notify_webhook "Container ${CONTAINER_NAME:1} (${CONTAINER_SHORT_ID}) found to be unhealthy. Successfully restarted the container!" & fi fi done