diff --git a/Dockerfile b/Dockerfile
index ff03956..de47844 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,21 @@
 FROM node:latest
 
-WORKDIR /usr/src/app
+ARG UID=987
+ARG GID=987
 
+RUN groupadd -g ${GID} chat && useradd -d /usr/src/app -g ${GID} -u ${UID} chat
+
+RUN mkdir -p /usr/src/app
+RUN chmod 750 -R /usr/src/app
 COPY package*.json ./
-#RUN apk update && apk upgrade # && apk add --update alpine-sdk  && apk add --update python 
+WORKDIR /usr/src/app
+RUN chown -R chat:chat /usr/src/app 
 RUN npm install
-# If you are building your code for production
-# RUN npm ci --omit=dev
-
 COPY . .
 
 EXPOSE 8080
+
+USER chat
+
+
 CMD [ "node", "src/index.js" ]
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..0a994db
--- /dev/null
+++ b/config.json
@@ -0,0 +1,9 @@
+{
+    "sessionSecret": "PLEASE!!CHANGE!!TO!!A!!STRONG!!ONE!!",
+    "dbUser": "smk",
+    "dbName": "chat",
+    "dbPort": 5432,
+    "dbPassword": "CHANGEME",
+    "dbHost": "db",
+    "listenPort": 8080
+}
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index 1d6f367..0d6f0e1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -22,9 +22,9 @@ services:
     volumes:
         - ./postgres:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: smk # The PostgreSQL user (useful to connect to the database)
-      POSTGRES_PASSWORD: CHANGEME # The PostgreSQL password (useful to connect to the database)
-      POSTGRES_DB: chat # The PostgreSQL default database (automatically created at first launch)
+      POSTGRES_USER: smk # do not forget to change these in config.json!
+      POSTGRES_PASSWORD: CHANGEME
+      POSTGRES_DB: chat
 
 networks:
   ne_nuzhen:
diff --git a/docs.md b/docs.md
index 8478720..61b2ad7 100644
--- a/docs.md
+++ b/docs.md
@@ -118,3 +118,23 @@ Otherwise, compares passwords
 If passwords match, creating session and redirects to __/__
 
 Requires client to be not logged in.
+
+
+## Deployment
+### Traditional
+To deploy an application in traditional way, follow these steps:
+
+1. edit ``config.json`` to your needs.
+
+2. Install dependencies: ``npm i``
+
+3. Run __src/index.js__. Use ``npm run prod`` if you want to run it as a production and ``npm run dev`` if you want to run it with nodemon.
+
+### Docker
+To deploy an application with Docker, you need to:
+
+1.  edit ``config.json`` to your needs ( do not forget that backend must be able to connect to db container.)
+
+2. edit ``docker-compose.yml`` as with the data you've wrote to ``config.json``
+
+3. Build and launch: ``docker-compose up --build``
\ No newline at end of file
diff --git a/package.json b/package.json
index ef80a81..46a20f4 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "test.js",
   "scripts": {
     "test": "nodemon test.js",
-    "dev": "nodemon src/index.js"
+    "dev": "nodemon src/index.js",
+    "prod": "node src/index.js"
   },
   "repository": {
     "type": "git",
diff --git a/src/index.js b/src/index.js
index f5d5b84..e15ae67 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,6 +4,9 @@ const cors = require("cors");
 const WebSocket = require('ws');
 const http = require('http');
 const session = require('express-session');
+const fs = require('fs')
+
+const config = JSON.parse(fs.readFileSync('config.json'));
 
 sessions = {}; // logged in clients, there are stored objects like {"token": "some_token_here", "socket": here-is-websocket-object}
 
@@ -12,7 +15,7 @@ const utils = require("./utils")
 
 const app = express();
 
-const PORT = 8080;
+const PORT = config.listenPort;
 
 utils.initDb();
 
@@ -135,7 +138,7 @@ console.log("[LOG] Socket has been started");
 
 const sessionParser = session({
     name: 'smk_chat',
-    secret: 'PLEASE!!GENERATE!!A!!STRONG!!ONE!!',
+    secret: config.sessionSecret,
     resave: false,
     saveUninitialized: false
 });
@@ -282,7 +285,7 @@ app.get('/api/getChatInfo/:chatId', middleware.requireToBeLoggedIn, async (req,
         membersRequest.rows.forEach((member, index, membersRequest) => {
             members.push(member.id)
         });
-        
+
         if (!members.includes(sessions[req.session.token].userId)) {
             return res.send("-2").status(403).end();
         }
@@ -300,10 +303,7 @@ app.get('/api/getChatInfo/:chatId', middleware.requireToBeLoggedIn, async (req,
     }
 });
 
-//IN: UserId, array of UserIDs that are to be invited.
-//OUT: "Ok" if successful, "User with id ${MEMBERID} does not exist."
-//Return -1 if amout of users to invite is 0.
-//Requires to be logged in
+
 app.post('/api/createChat', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const userId = sessions[req.session.token].userId
@@ -343,10 +343,6 @@ app.post('/api/createChat', middleware.requireToBeLoggedIn, async (req, res) =>
     }
 });
 
-//IN: none.
-//OUT: redirect to /login.
-//Removes client's session, thus unlogging a user.
-//Requires to be logged in.
 app.get('/api/logout', middleware.requireToBeLoggedIn, (req, res) => {
     try {
         sessions[req.session.token] = undefined;
@@ -359,11 +355,7 @@ app.get('/api/logout', middleware.requireToBeLoggedIn, (req, res) => {
 
 });
 
-//IN: lastname, firstname, middlename, password.
-//OUT: redirect to /.
-//Checks if user exist. If so, returns 400 with response "Such user exists.".
-//Otherwise, registers a user with given data.
-//Requires to be not logged in.
+
 app.post('/api/register', middleware.requireToBeNotLoggedIn, async (req, res) => {
     try {
         const { lastname, firstname, middlename, password } = req.body;
@@ -391,11 +383,7 @@ app.post('/api/register', middleware.requireToBeNotLoggedIn, async (req, res) =>
     }
 });
 
-//IN: lastname, firstname, middlename, password.
-//OUT: redirect to /.
-//Checks if user exists. If not, returns 400 with response "No such user.".
-//Otherwise, compares passwords using bcrypt
-//If passwords match, creating session and redirects to /
+
 app.post('/api/login', middleware.requireToBeNotLoggedIn, async (req, res) => {
     try {
         const { lastname, firstname, middlename, password } = req.body;
diff --git a/src/utils.js b/src/utils.js
index 24a3658..bf3793b 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,15 +1,16 @@
 const pg = require('pg');
 const fs = require('fs');
 
+const config = JSON.parse(fs.readFileSync('config.json'))
+
 const { Client } = pg;
 
 client = new Client({
-    user: "smk",
-    password: "CHANGEME", // do not forget to change it in docker-compose.yml in db section.
-    // host: "10.5.0.6", //defined in docker-compose.yml.
-    host: 'localhost',
-    port: 5432,
-    database: "chat"
+    user: config.dbUser,
+    password: config.dbPassword,
+    host: config.dbHost,
+    port: config.dbPort,
+    database: config.dbName
 });
 
 module.exports = {