source: Installation/Installation-CentOS-7-Nginx.md
> NOTE: These instructions assume you are the **root** user.  If you are not, prepend `sudo` to the shell commands (the ones that aren't at `mysql>` prompts) or temporarily become a user with root privileges with `sudo -s` or `sudo -i`.

## Install Required Packages ##

    yum install epel-release

    rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm

    yum install cronie fping git ImageMagick jwhois mariadb mariadb-server mtr MySQL-python net-snmp net-snmp-utils nginx nmap php71w php71w-cli php71w-common php71w-curl php71w-fpm php71w-gd php71w-mcrypt php71w-mysql php71w-process php71w-snmp php71w-xml php71w-zip python-memcached rrdtool

#### Add librenms user

    useradd librenms -d /opt/librenms -M -r
    usermod -a -G librenms nginx

#### Install LibreNMS

    cd /opt
    git clone https://github.com/librenms/librenms.git librenms

## DB Server ##

#### Configure MySQL

    systemctl start mariadb
    mysql -u root

> NOTE: Please change the 'password' below to something secure.
```sql
CREATE DATABASE librenms CHARACTER SET utf8 COLLATE utf8_unicode_ci;
CREATE USER 'librenms'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost';
FLUSH PRIVILEGES;
exit
```

    vi /etc/my.cnf

> NOTE: Whilst we are working on ensuring LibreNMS is compatible with MySQL strict mode, for now, please disable this after mysql is installed.

Within the `[mysqld]` section please add:

```bash
innodb_file_per_table=1
sql-mode=""
lower_case_table_names=0
```
    systemctl enable mariadb
    systemctl restart mariadb

## Web Server ##

### Configure and Start PHP-FPM

Ensure date.timezone is set in php.ini to your preferred time zone.  See http://php.net/manual/en/timezones.php for a list of supported timezones.  Valid examples are: "America/New_York", "Australia/Brisbane", "Etc/UTC".

    vi /etc/php.ini

In `/etc/php-fpm.d/www.conf` make these changes:

    vi /etc/php-fpm.d/www.conf

```nginx
;user = apache
user = nginx

group = apache   ; keep group as apache

;listen = 127.0.0.1:9000
listen = /var/run/php-fpm/php7.1-fpm.sock

listen.owner = nginx
listen.group = nginx
listen.mode = 0660
```

    systemctl enable php-fpm
    systemctl restart php-fpm

### Configure NGINX

    vi /etc/nginx/conf.d/librenms.conf

Add the following config, edit `server_name` as required:

```nginx
server {
 listen      80;
 server_name librenms.example.com;
 root        /opt/librenms/html;
 index       index.php;

 charset utf-8;
 gzip on;
 gzip_types text/css application/javascript text/javascript application/x-javascript image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;
 location / {
  try_files $uri $uri/ /index.php?$query_string;
 }
 location /api/v0 {
  try_files $uri $uri/ /api_v0.php?$query_string;
 }
 location ~ \.php {
  include fastcgi.conf;
  fastcgi_split_path_info ^(.+\.php)(/.+)$;
  fastcgi_pass unix:/var/run/php-fpm/php7.1-fpm.sock;
 }
 location ~ /\.ht {
  deny all;
 }
}
```

> NOTE: If this is the only site you are hosting on this server (it should be :)) then you will need to disable the default site.
Delete the `server` section from `/etc/nginx/nginx.conf`

    systemctl enable nginx
    systemctl restart nginx

#### SELinux

Install the policy tool for SELinux:

    yum install policycoreutils-python

Configure the contexts needed by LibreNMS:

    semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/logs(/.*)?'
    semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/logs(/.*)?'
    restorecon -RFvv /opt/librenms/logs/
    semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/rrd(/.*)?'
    semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/rrd(/.*)?'
    restorecon -RFvv /opt/librenms/rrd/
    setsebool -P httpd_can_sendmail=1
    setsebool -P httpd_execmem 1

#### Allow access through firewall

    firewall-cmd --zone public --add-service http
    firewall-cmd --permanent --zone public --add-service http
    firewall-cmd --zone public --add-service https
    firewall-cmd --permanent --zone public --add-service https

#### Configure snmpd

    cp /opt/librenms/snmpd.conf.example /etc/snmp/snmpd.conf

    vi /etc/snmp/snmpd.conf

Edit the text which says `RANDOMSTRINGGOESHERE` and set your own community string.

    curl -o /usr/bin/distro https://raw.githubusercontent.com/librenms/librenms-agent/master/snmp/distro
    chmod +x /usr/bin/distro
    systemctl enable snmpd
    systemctl restart snmpd

### Cron job

    cp /opt/librenms/librenms.nonroot.cron /etc/cron.d/librenms`

#### Copy logrotate config

LibreNMS keeps logs in `/opt/librenms/logs`. Over time these can become large and be rotated out.  To rotate out the old logs you can use the provided logrotate config file:

    cp /opt/librenms/misc/librenms.logrotate /etc/logrotate.d/librenms

### Set permissions

    chown -R librenms:librenms /opt/librenms
    setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs
    setfacl -R -m g::rwx /opt/librenms/rrd /opt/librenms/logs

## Web installer ##

Now head to the web installer and follow the on-screen instructions.

    http://librenms.example.com/install.php

### Final steps

That's it!  You now should be able to log in to http://librenms.example.com/.  Please note that we have not covered HTTPS setup in this example, so your LibreNMS install is not secure by default.  Please do not expose it to the public Internet unless you have configured HTTPS and taken appropriate web server hardening steps.

#### Add the first device

We now suggest that you add localhost as your first device from within the WebUI.

#### Troubleshooting

If you ever have issues with your install, run validate.php as root in the librenms directory:

    cd /opt/librenms
    ./validate.php

There are various options for getting help listed on the LibreNMS web site: https://www.librenms.org/#support

### What next?

Now that you've installed LibreNMS, we'd suggest that you have a read of a few other docs to get you going:

 - [Performance tuning](http://docs.librenms.org/Support/Performance)
 - [Alerting](http://docs.librenms.org/Extensions/Alerting/)
 - [Device Groups](http://docs.librenms.org/Extensions/Device-Groups/)
 - [Auto discovery](http://docs.librenms.org/Extensions/Auto-Discovery/)

### Closing

We hope you enjoy using LibreNMS. If you do, it would be great if you would consider opting into the stats system we have, please see [this page](http://docs.librenms.org/General/Callback-Stats-and-Privacy/) on what it is and how to enable it.

If you would like to help make LibreNMS better there are [many ways to help](http://docs.librenms.org/Support/FAQ/#what-can-i-do-to-help). You can also [back LibreNMS on Open Collective](https://t.libren.ms/donations).