Migrate supervisord to parallel (#1592)

cmd/dashboard/docker/Dockerfile

@@ -61,16 +61,19 @@ ARG DOCKER_CLI_VERSION="18.09.6"
 
 ENV DOWNLOAD_URL="https://download.docker.com/linux/static/stable/x86_64/docker-$DOCKER_CLI_VERSION.tgz"
 
-RUN apk --update --no-cache add ca-certificates git curl supervisor \
+RUN apk --update --no-cache add ca-certificates git curl parallel \
     && mkdir -p /tmp/download \
     && curl -L $DOWNLOAD_URL | tar -xz -C /tmp/download \
     && mv /tmp/download/docker/docker /usr/local/bin/ \
     && rm -rf /tmp/download \
     && apk del curl
 
-# copy supervisord configuration files
-COPY cmd/dashboard/docker/supervisor.conf /etc/supervisor.conf
-COPY cmd/dashboard/docker/dashboard.sv.conf /etc/supervisor/conf.d/dashboard.conf
+# copy runners
+COPY cmd/dashboard/docker/runners /runners
+COPY cmd/dashboard/docker/runner.sh /runner.sh
+
+# make them executable
+RUN chmod +x /runners/*.sh /runner.sh
 
 # copy nginx config
 COPY cmd/dashboard/docker/nginx.conf /etc/nginx/conf.d/default.conf
@@ -85,4 +88,4 @@ COPY --from=build-binary /go/src/github.com/nuclio/nuclio/dashboard /usr/local/b
 ARG NUCLIO_VERSION_INFO_FILE_CONTENTS
 RUN mkdir -p /etc/nuclio && echo ${NUCLIO_VERSION_INFO_FILE_CONTENTS} > /etc/nuclio/version_info.json
 
-CMD ["supervisord", "-c", "/etc/supervisor.conf", "-l", "/etc/supervisor.log", "-j", "/etc/supervisor.pid"]
+CMD ["sh",  "-c", "./runner.sh"]

cmd/dashboard/docker/runner.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env sh
+
+_term() {
+  echo "Signal caught ... cleaning up"
+  kill -TERM "$child" 2>/dev/null
+}
+
+trap _term SIGTERM
+trap _term SIGINT
+
+echo "Running in parallel"
+
+parallel --citation
+
+# buffer output on line basis
+# exit when the first job fails, kill all running jobs.
+# upon unexpected termination, signal jobs before killing (signal, timeout)
+# execute all *.sh files in parallel
+parallel \
+        --line-buffer \
+        --halt now,fail=1 \
+        --termseq INT,200,TERM,100,KILL,25 \
+        '{}' ::: /runners/*.sh &
+
+child=$!
+wait "$child"
+echo "Exiting"

cmd/dashboard/docker/runners/dashboard.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+echo "Starting dashboard"
+/usr/local/bin/dashboard --docker-key-dir /etc/nuclio/dashboard/registry-credentials --listen-addr :18070 2>&1

cmd/dashboard/docker/runners/nginx.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+echo "Starting nginx"
+/usr/sbin/nginx -g "daemon off;" &> /var/log/nginx/logs.log