# Production Installation on Red Hat Enterprise Linux 6.6

## Install Red Hat Enterprise Linux (x64) 6.6
1. Set up 3 machines with RHEL with 2GB of RAM or more.  The servers will be used for the Load Balancer, Mattermost (this must be x64 to use pre-built binaries), and Database.
   - **Optional:** You can also use a single machine for all 3 components in this install guide, depending on the standards of your data center.
2. Make sure the system is up to date with the most recent security patches.
  * ``` sudo yum update```
  * ``` sudo yum upgrade```

## Set up Database Server
1. For the purposes of this guide we will assume this server has an IP address of `10.10.10.1`
  - **Optional:** if installing on the same machine substitute `10.10.10.1` with `127.0.0.1`
1. Install PostgreSQL 9.4+ (or MySQL 5.6+)
  * ``` sudo yum install http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-redhat94-9.4-1.noarch.rpm```
  * ``` sudo yum install postgresql94-server postgresql94-contrib```
  * ``` sudo service postgresql-9.4 initdb```
  * ``` sudo chkconfig postgresql-9.4 on```
  * ``` sudo service postgresql-9.4 start```
1. PostgreSQL created a user account called `postgres`.  You will need to log into that account with:
  * ``` sudo -i -u postgres```
1. You can get a PostgreSQL prompt by typing:
  * ``` psql```
1. Create the Mattermost database by typing:
  * ```postgres=# CREATE DATABASE mattermost;```
1. Create the Mattermost user by typing:
  * ```postgres=# CREATE USER mmuser WITH PASSWORD 'mmuser_password';```
1. Grant the user access to the Mattermost database by typing:
  * ```postgres=# GRANT ALL PRIVILEGES ON DATABASE mattermost to mmuser;```
1. You can exit out of PostgreSQL by typing:
  * ```postgres=# \q```
1. You can exit the Postgres account by typing:
  * ``` exit```
1. Allow Postgres to listen on all assigned IP Addresses:
  * ```sudo vi /var/lib/pgsql/9.4/data/postgresql.conf```
  * Uncomment 'listen_addresses' and change 'localhost' to '*'
1. Alter `pg_hba.conf` to allow the Mattermost Server to talk to the Postgres database:
  * ```sudo vi /var/lib/pgsql/9.4/data/pg_hba.conf```
  * Add the following line to the 'IPv4 local connections':
  * host    all             all             10.10.10.2/32         md5
1. Reload Postgres database:
  * ```sudo service postgresql-9.4 restart```
1. Attempt to connect with the new created user to verify everything looks good:
  * ```psql --host=10.10.10.1 --dbname=mattermost --username=mmuser --password```
  * ```mattermost=> \q```


## Set up Mattermost Server
1. For the purposes of this guide we will assume this server has an IP address of `10.10.10.2`
1. Download the latest Mattermost Server by typing:
  * ``` wget https://github.com/mattermost/platform/releases/download/v1.3.0/mattermost.tar.gz```
1. Install Mattermost under `/opt`
   * Unzip the Mattermost Server by typing:
   * ``` tar -xvzf mattermost.tar.gz```
   * ``` sudo mv mattermost /opt```
1. Create the storage directory for files.  We assume you will have attached a large drive for storage of images and files.  For this setup we will assume the directory is located at `/opt/mattermost/data`.
  * Create the directory by typing:
  * ``` sudo mkdir -p /opt/mattermost/data```
1. Create a system user and group called mattermost that will run this service:
   * ``` sudo useradd -r mattermost -U```
   * Set the Mattermost account as the directory owner by typing:
   * ``` sudo chown -R mattermost:mattermost /opt/mattermost```
   * ``` sudo chmod -R g+w /opt/mattermost```
   * Add yourself to the mattermost group to ensure you can edit these files:
   * ``` sudo usermod -a -G mattermost USERNAME```
1. Configure Mattermost Server by editing the `config.json` file at `/opt/mattermost/config`
  * ``` cd /opt/mattermost/config```
  * Edit the file by typing:
  * ``` sudo vi config.json```
  * replace `DriverName": "mysql"` with `DriverName": "postgres"`
  * replace `"DataSource": "mmuser:mostest@tcp(dockerhost:3306)/mattermost_test?charset=utf8mb4,utf8"` with `"DataSource": "postgres://mmuser:mmuser_password@10.10.10.1:5432/mattermost?sslmode=disable&connect_timeout=10"`
  * Optionally you may continue to edit configuration settings in `config.json` or use the System Console described in a later section to finish the configuration.
1. Test the Mattermost Server
  * ``` cd /opt/mattermost/bin```
  * Run the Mattermost Server by typing:
  * ``` sudo su mattermost```
  * ``` ./platform```
  * You should see a console log like `Server is listening on :8065` letting you know the service is running.
  * Stop the server for now by typing `Ctrl-C`
1. Setup Mattermost to use the Upstart daemon which handles supervision of the Mattermost process.
  * ``` sudo touch /etc/init/mattermost.conf```
  * ``` sudo vi /etc/init/mattermost.conf```
  * Copy the following lines into `/etc/init/mattermost.conf`
```
start on runlevel [2345]
stop on runlevel [016]
respawn
chdir /opt/mattermost
exec bin/platform
```
  * You can manage the process by typing:
  * ``` sudo start mattermost```
  * Verify the service is running by typing:
  * ``` curl http://10.10.10.2:8065```
  * You should see a page titles *Mattermost - Signup*
  * You can also stop the process by running the command ` sudo stop mattermost`, but we will skip this step for now.

## Set up Nginx Server
1. For the purposes of this guide we will assume this server has an IP address of `10.10.10.3`
1. We use Nginx for proxying request to the Mattermost Server.  The main benefits are:
  * SSL termination
  * HTTP to HTTPS redirect
  * Port mapping :80 to :8065
  * Standard request logs
1. Install Nginx on RHEL with
  * ``` sudo vi /etc/yum.repos.d/nginx.repo```
  * Copy the below into the file
```
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/rhel/6/$basearch/
gpgcheck=0
enabled=1
```
  * ``` sudo yum install nginx.x86_64```
  * ``` sudo service nginx start```
  * ``` sudo chkconfig nginx on```
1. Verify Nginx is running
  * ``` curl http://10.10.10.3```
  * You should see a *Welcome to nginx!* page
1. Map a FQDN (fully qualified domain name) like **mattermost.example.com** to point to the Nginx server.
1. Configure Nginx to proxy connections from the internet to the Mattermost Server
  * Create a configuration for Mattermost
  * ``` sudo touch /etc/nginx/conf.d/mattermost.conf```
  * Below is a sample configuration with the minimum settings required to configure Mattermost
```
   server {
      server_name mattermost.example.com;

      location / {
         client_max_body_size 50M;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection "upgrade";
         proxy_set_header Host $http_host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_set_header X-Frame-Options SAMEORIGIN;
         proxy_pass http://10.10.10.2:8065;
      }
   }
```
  * Remove the existing file with:
  * ``` sudo mv /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf.bak```
  * Restart Nginx by typing:
  * ``` sudo service nginx restart```
  * Verify you can see Mattermost thru the proxy by typing:
  * ``` curl http://localhost```
  * You should see a page titles *Mattermost - Signup*
  * Not seeing the page?  Look for errors with ``` sudo cat /var/log/audit/audit.log | grep nginx | grep denied```  
  * **Optional** if you're running on the same server as the Mattermost server and see 502 errors you may need to run `sudo setsebool -P httpd_can_network_connect true` because SELinux is preventing the connection

## Set up Nginx with SSL (Recommended)
1. You will need a SSL cert from a certificate authority.
1. For simplicity we will generate a test certificate.
  * ``` mkdir /top/mattermost/cert```
  * ``` cd /top/mattermost/cert```
  * ``` sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout mattermost.key -out mattermost.crt```
  * Input the following info 
```
    Country Name (2 letter code) [AU]:US
    State or Province Name (full name) [Some-State]:California
    Locality Name (eg, city) []:Palo Alto
    Organization Name (eg, company) [Internet Widgits Pty Ltd]:Example LLC
    Organizational Unit Name (eg, section) []:
    Common Name (e.g. server FQDN or YOUR name) []:mattermost.example.com
    Email Address []:admin@mattermost.example.com
```
1. Run `openssl dhparam -out dhparam.pem 4096` (it will take some time).
1. Modify the file at `/etc/nginx/conf.d/mattermost.conf` and add the following lines
```
  server {
     listen         80;
     server_name    mattermost.example.com;
     return         301 https://$server_name$request_uri;
  }

  server {
     listen 443 ssl;
     server_name mattermost.example.com;

     ssl on;
     ssl_certificate /home/ubuntu/cert/mattermost.crt;
     ssl_certificate_key /home/ubuntu/cert/mattermost.key;
     ssl_dhparam /home/ubuntu/cert/dhparam.pem;
     ssl_session_timeout 5m;
     ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
     ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
     ssl_prefer_server_ciphers on;
     ssl_session_cache shared:SSL:10m;

     location / {
        gzip off;
        proxy_set_header X-Forwarded-Ssl on;
        client_max_body_size 50M;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Frame-Options SAMEORIGIN;
        proxy_pass http://10.10.10.2:8065;
     }
  }
```

## Finish Mattermost Server setup
1. Navigate to `https://mattermost.example.com` and create a team and user.
1. The first user in the system is automatically granted the `system_admin` role, which gives you access to the System Console.
1. From the `town-square` channel click the dropdown and choose the `System Console` option
1. Update Email Settings.  We recommend using an email sending service.  The example below assumes AmazonSES.
  * Set *Send Email Notifications* to true
  * Set *Require Email Verification* to true
  * Set *Feedback Name* to `No-Reply`
  * Set *Feedback Email* to `mattermost@example.com`
  * Set *SMTP Username* to `AFIADTOVDKDLGERR`
  * Set *SMTP Password* to `DFKJoiweklsjdflkjOIGHLSDFJewiskdjf`
  * Set *SMTP Server* to `email-smtp.us-east-1.amazonaws.com`
  * Set *SMTP Port* to `465`
  * Set *Connection Security* to `TLS`
  * Save the Settings
1. Update File Settings:
  * Change *Local Directory Location* from `./data/` to `/opt/mattermost/data`
1. Update Log Settings:
  * Set *Log to The Console* to `false`  
1. Update Rate Limit Settings:
  * Set *Vary By Remote Address* to false
  * Set *Vary By HTTP Header* to X-Real-IP
1. Feel free to modify other settings
1. Restart the Mattermost Service by typing:
  * ``` sudo restart mattermost```