Added multiple api servers in compose file. nginx load balancing

conf/mime.types

@@ -0,0 +1,48 @@
+types {
+  text/html                             html htm shtml;
+  text/css                              css;
+  text/xml                              xml rss;
+  image/gif                             gif;
+  image/jpeg                            jpeg jpg;
+  application/x-javascript              js;
+  text/plain                            txt;
+  text/x-component                      htc;
+  text/mathml                           mml;
+  image/png                             png;
+  image/x-icon                          ico;
+  image/x-jng                           jng;
+  image/vnd.wap.wbmp                    wbmp;
+  application/java-archive              jar war ear;
+  application/mac-binhex40              hqx;
+  application/pdf                       pdf;
+  application/x-cocoa                   cco;
+  application/x-java-archive-diff       jardiff;
+  application/x-java-jnlp-file          jnlp;
+  application/x-makeself                run;
+  application/x-perl                    pl pm;
+  application/x-pilot                   prc pdb;
+  application/x-rar-compressed          rar;
+  application/x-redhat-package-manager  rpm;
+  application/x-sea                     sea;
+  application/x-shockwave-flash         swf;
+  application/x-stuffit                 sit;
+  application/x-tcl                     tcl tk;
+  application/x-x509-ca-cert            der pem crt;
+  application/x-xpinstall               xpi;
+  application/zip                       zip;
+  application/octet-stream              deb;
+  application/octet-stream              bin exe dll;
+  application/octet-stream              dmg;
+  application/octet-stream              eot;
+  application/octet-stream              iso img;
+  application/octet-stream              msi msp msm;
+  audio/mpeg                            mp3;
+  audio/x-realaudio                     ra;
+  video/mpeg                            mpeg mpg;
+  video/quicktime                       mov;
+  video/x-flv                           flv;
+  video/x-msvideo                       avi;
+  video/x-ms-wmv                        wmv;
+  video/x-ms-asf                        asx asf;
+  video/x-mng                           mng;
+}

conf/nginx.conf

@@ -0,0 +1,45 @@
+#user       www www;  ## Default: nobody
+worker_processes  5;  ## Default: 1
+error_log  logs/error.log;
+pid        logs/nginx.pid;
+worker_rlimit_nofile 8192;
+
+events {
+  worker_connections  4096;  ## Default: 1024
+}
+
+
+http {
+  include    conf/mime.types;
+  #include    /etc/nginx/proxy.conf;
+  #include    /etc/nginx/fastcgi.conf;
+  index    index.html index.htm index.php;
+
+  default_type application/octet-stream;
+
+  log_format   main '$remote_addr - $remote_user [$time_local]  $status '
+    '"$request" $body_bytes_sent "$http_referer" '
+    '"$http_user_agent" "$http_x_forwarded_for"';
+  access_log   logs/access.log  main;
+  sendfile     on;
+  tcp_nopush   on;
+  server_names_hash_bucket_size 128; # this seems to be required for some vhosts
+
+
+  upstream balsam {
+    server gunicorn1:8001 weight=5;
+    server gunicorn2:8002 weight=5;
+  }
+
+  server { # simple load balancing
+    listen          80;
+    server_name     localhost;
+    access_log      logs/balsam.access.log main;
+
+    location / {
+      proxy_pass  http://balsam;
+
+      include uwsgi_params;
+    }
+  }
+}

docker-compose.yml

@@ -1,13 +1,51 @@
 version: "3.9"
 
 services:
-  gunicorn:
-    container_name: gunicorn
+  nginx: 
+    image: nginx:latest
+    container_name: nginx
+    depends_on:
+      - gunicorn1
+      - gunicorn2
+    volumes:
+      - ./conf/nginx.conf:/etc/nginx/nginx.conf
+      - ./conf/mime.types:/etc/nginx/conf/mime.types
+      - ./logs:/etc/nginx/logs
+    ports:
+      - 80:80
+      - 443:443
+
+  gunicorn1:
+    container_name: gunicorn1
+    build: .
+    image: masalim2/balsam
+    restart: always
+    ports:
+      - 8001:8001
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_started
+    # Vars in env_file are exported to the containers
+    # Vars in ".env" specifically are also usable in the compose file as ${VAR}
+    env_file: ".env"
+    environment:
+      SERVER_PORT: 8001
+      BALSAM_LOG_DIR: ${BALSAM_LOG_DIR}
+    volumes:
+      - "${BALSAM_LOG_DIR}:/balsam/log"
+      - "./balsam:/balsam/balsam:ro"
+      - "./tests:/balsam/tests:ro"
+      - "${PWD}/${GUNICORN_CONFIG_FILE}:/balsam/gunicorn.conf.py:ro" # Must be abs path
+
+  gunicorn2:
+    container_name: gunicorn2
     build: .
     image: masalim2/balsam
     restart: always
     ports:
-      - ${SERVER_PORT}:${SERVER_PORT}
+      - 8002:8002
     depends_on:
       postgres:
         condition: service_healthy
@@ -17,7 +55,7 @@ services:
     # Vars in ".env" specifically are also usable in the compose file as ${VAR}
     env_file: ".env"
     environment:
-      SERVER_PORT: ${SERVER_PORT}
+      SERVER_PORT: 8002
       BALSAM_LOG_DIR: ${BALSAM_LOG_DIR}
     volumes:
       - "${BALSAM_LOG_DIR}:/balsam/log"
@@ -36,7 +74,7 @@ services:
       POSTGRES_PASSWORD: postgres
       POSTGRES_DB: balsam
     volumes:
-      - "pgdata:/var/lib/postgresql/data"
+      - "balsamdata:/var/lib/postgresql/data"
     command: "-c log_min_duration_statement=0"
     logging:
       options:
@@ -57,4 +95,4 @@ services:
       - 6379:6379
 
 volumes:
-  pgdata:
+  balsamdata: