add traefik loadbalancer to docker stack

.Rbuildignore

@@ -40,3 +40,4 @@ docker-compose.yml
 .env.prod
 .lintr
 restart.txt
+inst/log

.dockerignore

@@ -1,7 +1,9 @@
 .git
 *.log
+**/*.log
 renv/library
 renv/local
 renv/staging
 Dockerfile
 docker-compose.yml
+inst/log

.env.dev

@@ -1,3 +1,5 @@
 PROJECT_DIRECTORY=./inst/extdata/projects
-MEMORY_LIMIT=2G
+LOG_DIRECTORY=./inst/log
+LOG_LEVEL=ERROR
+MEMORY_LIMIT=4G
 REPLICAS=2

.env.prod

@@ -1,3 +1,5 @@
 PROJECT_DIRECTORY=/opt/wheretowork/projects
+LOG_DIRECTORY=/opt/wheretowork/log
+LOG_LEVEL=ERROR
 MEMORY_LIMIT=10G
 REPLICAS=3

.gitignore

@@ -21,7 +21,7 @@ check.log
 spell.log
 gp.log
 examples.log
-restart.txt
+inst/log/*
 
 # system files
 .directory

Dockerfile

@@ -42,21 +42,9 @@ COPY R /app/R
 COPY .Rbuildignore /app
 COPY DESCRIPTION /app
 COPY NAMESPACE /app
-
 RUN cd /app && \
     Rscript -e 'remotes::install_local(upgrade = "never")'
 
-## set working directory
-RUN touch restart.txt && \
-    chmod 777 restart.txt
-
-# update shiny server configuration
-# RUN cp  /etc/shiny-server/shiny-server.conf /tmp/shiny-server.conf && \
-#    sed -i 's/run_as shiny;/run_as shiny;preserve_logs true;/g' \
-#      /tmp/shiny-server.conf && \
-#    cp  /tmp/shiny-server.conf /etc/shiny-server/shiny-server.conf && \
-#    cat /etc/shiny-server/shiny-server.conf
-
 # set command
 CMD ["/bin/bash"]
 
@@ -80,14 +68,25 @@ CMD Rscript -e "rsconnect::setAccountInfo(name=Sys.getenv('SHINYAPPS_USER'), tok
 # main image
 FROM base AS main
 
-RUN rm -f /usr/bin/shiny-server.sh
+## allow shiny server to spawn processes for different users
+RUN cd /srv/shiny-server && \
+    touch restart.txt && \
+    chmod 666 restart.txt
 
 ## set user
 USER shiny
 
 ## select port
 EXPOSE 3838
 
+## copy shiny server config file
+COPY inst/shiny-server.conf /etc/shiny-server/shiny-server.conf
+
+## prepare log directory
+RUN mkdir -p /var/log/shiny-server && \
+    chown shiny.shiny /var/log/shiny-server && \
+    chmod -R 666 /var/log/shiny-server
+
 ## copy app file for shiny server
 COPY --chown=shiny:shiny app.R /srv/shiny-server
 
@@ -99,4 +98,4 @@ RUN env | grep R_CONFIG_ACTIVE > /home/shiny/.Renviron
 WORKDIR /home/shiny
 
 ## run app
-CMD ["shiny-server"]
+CMD ["/usr/bin/shiny-server"]

Makefile

@@ -68,7 +68,7 @@ quick-debug:
 
 ## launch local version inside Docker container
 demo:
-	docker-compose --env-file ./.env.dev up --build main
+	docker-compose --env-file ./.env.dev up --build
 
 demo-kill:
 	docker-compose --env-file ./.env.dev down

R/app_server.R

@@ -7,7 +7,8 @@ app_server <- function(input, output, session) {
 
   # initialization
   ## spawn new process so that users in different process
-  try(system("touch restart.txt"), silent = TRUE)
+  # try(system("touch restart.txt"), silent = TRUE)
+
   ## initialize app
   eval(server_initialize_app)
 

docker-compose.yml

@@ -1,42 +1,61 @@
 version: "3.9"
 services:
 
-  visualizer:
-    image: dockersamples/visualizer:stable
-    ports:
-      - "8080:8080"
-    volumes:
-      - "/var/run/docker.sock:/var/run/docker.sock"
-    deploy:
-      placement:
-        constraints: [node.role == manager]
-
-  watchtower:
+  updater:
     image: v2tec/watchtower
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
       - /root/.docker/config.json:/config.json
     command: --schedule "0 0 * * *" --cleanup
 
-  main:
+  balancer:
+    image: traefik:v1.7
+    command: --docker \
+      --docker.watch \
+      --docker.domain=localhost \
+      --web \
+      --loglevel=${LOG_LEVEL}
+    ports:
+        - "80:80"
+        - "443:443"
+        - "8080:8080"
+    volumes:
+        - /var/run/docker.sock:/var/run/docker.sock
+    deploy:
+      mode: replicated
+      replicas: 1
+      resources:
+        limits:
+          memory: 1G
+      placement:
+        constraints: [node.role == manager]
+    networks:
+      - net
+
+  shiny:
     build:
       context: .
       dockerfile: Dockerfile
       target: main
     image: naturecons/wheretowork:latest
-    ports:
-      - "3939:3838"
     volumes:
       - "${PROJECT_DIRECTORY}:/projects"
+      - "${LOG_DIRECTORY}:/var/log/shiny-server/"
     deploy:
+      mode: replicated
       replicas: "${REPLICAS}"
       restart_policy:
         condition: on-failure
       resources:
         limits:
           memory: "${MEMORY_LIMIT}"
     networks:
-      - app
+      - net
+    labels:
+      - "traefik.docker.network=ssp_net"
+      - "traefik.port=3838"
+      - "traefik.frontend.rule=PathPrefix:/;"
+      - "traefik.backend.loadbalancer.sticky=true"
 
 networks:
-  app:
+  net:

inst/shiny-server.conf

@@ -0,0 +1,30 @@
+# define the user we should use when spawning R Shiny processes
+run_as shiny;
+
+# disable websocket
+disable_protocols websocket;
+
+# disable idle timeout to retain connection
+app_idle_timeout 0;
+
+# define a top-level server which will listen on a port
+server {
+  # instruct this server to listen on port 3838
+  listen 3838;
+
+  # define the location available at the base URL
+  location / {
+
+    # run this location in 'site_dir' mode, which hosts the entire directory
+    # tree at '/srv/shiny-server'
+    site_dir /srv/shiny-server;
+
+    # define where we should put the log files for this location
+    log_dir /var/log/shiny-server;
+
+    # when a user visits the base URL rather than a particular application,
+    # an index of the applications available in this directory will be shown.
+    directory_index on;
+
+  }
+}