librenms-librenms/doc/Installation/Installation-CentOS-7-Apache.md

source: Installation/Installation-CentOS-7-Apache.md path: blob/master/doc/

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.

Please note the minimum supported PHP version is 7.2.5

Install Common Required Packages

yum install epel-release

yum install git cronie fping jwhois ImageMagick mtr MySQL-python net-snmp net-snmp-utils nmap python-memcached rrdtool policycoreutils-python httpd mariadb mariadb-server unzip python3 python3-pip

Install PHP

CentOS 7 comes with php 5.4 which is not compatible with LibreNMS. There are multiple ways to install php 7.x on CentOS 7, like Webtatic, Remi or SCL, the last two are maintained by Remi Collet of RedHat.

Running with Remi PHP

yum localinstall http://rpms.remirepo.net/enterprise/remi-release-7.rpm

Install the yum-config-manager to change to Remi PHP 7.3 Repo.

yum install yum-utils
yum-config-manager --enable remi-php73

Install the required packages

yum install mod_php php-cli php-common php-curl php-gd php-mbstring php-process php-snmp php-xml php-zip php-memcached php-mysqlnd

Running with CentOS SCL php

yum install centos-release-scl

yum install rh-php72 rh-php72-php-cli rh-php72-php-common rh-php72-php-curl rh-php72-php-gd rh-php72-php-mbstring rh-php72-php-process rh-php72-php-snmp rh-php72-php-xml rh-php72-php-zip rh-php72-php-memcached rh-php72-php-mysqlnd

ln -s /opt/rh/rh-php72/root/usr/bin/php /usr/bin/php
ln -s /opt/rh/httpd24/root/etc/httpd/conf.d/rh-php72-php.conf /etc/httpd/conf.d/
ln -s /opt/rh/httpd24/root/etc/httpd/conf.modules.d/15-rh-php72-php.conf /etc/httpd/conf.modules.d/
ln -s /opt/rh/httpd24/root/etc/httpd/modules/librh-php72-php7.so /etc/httpd/modules/

Add librenms user

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

Download LibreNMS

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

Set permissions

chown -R librenms:librenms /opt/librenms
chmod 770 /opt/librenms
setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/ /opt/librenms/cache
setfacl -R -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/ /opt/librenms/cache

Install PHP dependencies

su - librenms
./scripts/composer_wrapper.php install --no-dev
exit

DB Server

Configure MySQL

systemctl enable --now mariadb
mysql -u root

NOTE: Please change the 'password' below to something secure.

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

Within the [mysqld] section please add:

innodb_file_per_table=1
lower_case_table_names=0

systemctl restart mariadb

Web Server

Configure PHP

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".

When PHP is configured with open_basedir, be sure to allow the following paths for LibreNMS to work:

php_admin_value[open_basedir] = "/opt/librenms:/usr/lib64/nagios/plugins:/dev/urandom:/usr/sbin/fping:/usr/sbin/fping6:/usr/bin/snmpgetnext:/usr/bin/rrdtool:/usr/bin/snmpwalk:/usr/bin/snmpget:/usr/bin/snmpbulkwalk:/usr/bin/snmptranslate:/usr/bin/traceroute:/usr/bin/whois:/bin/ping:/usr/sbin/mtr:/usr/bin/nmap:/usr/sbin/ipmitool:/usr/bin/virsh:/usr/bin/nfdump"

vi  /etc/php.ini

or

vi /etc/opt/rh/rh-php72/php.ini

Configure Apache

Create the librenms.conf:

vi /etc/httpd/conf.d/librenms.conf

Add the following config, edit ServerName as required:

<VirtualHost *:80>
  DocumentRoot /opt/librenms/html/
  ServerName  librenms.example.com

  AllowEncodedSlashes NoDecode
  <Directory "/opt/librenms/html/">
    Require all granted
    AllowOverride All
    Options FollowSymLinks MultiViews
  </Directory>
</VirtualHost>

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. rm -f /etc/httpd/conf.d/welcome.conf

systemctl enable --now httpd

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/
semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/storage(/.*)?'
semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/storage(/.*)?'
restorecon -RFvv /opt/librenms/storage/
semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/bootstrap/cache(/.*)?'
semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/bootstrap/cache(/.*)?'
restorecon -RFvv /opt/librenms/bootstrap/cache/
semanage fcontext -a -t httpd_sys_content_t '/opt/librenms/cache(/.*)?'
semanage fcontext -a -t httpd_sys_rw_content_t '/opt/librenms/cache(/.*)?'
restorecon -RFvv /var/www/opt/librenms/cache/
setsebool -P httpd_can_sendmail=1

Additional SELinux problems may be found by executing the following command

audit2why < /var/log/audit/audit.log

Allow fping

Create the file http_fping.tt with the following contents. You can create this file anywhere, as it is a throw-away file. The last step in this install procedure will install the module in the proper location.

module http_fping 1.0;

require {
type httpd_t;
class capability net_raw;
class rawip_socket { getopt create setopt write read };
}

#============= httpd_t ==============
allow httpd_t self:capability net_raw;
allow httpd_t self:rawip_socket { getopt create setopt write read };

Then run these commands

checkmodule -M -m -o http_fping.mod http_fping.tt
semodule_package -o http_fping.pp -m http_fping.mod
semodule -i http_fping.pp

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

Copy the example snmpd.conf from the LibreNMS install.

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

NOTE: Keep in mind that cron, by default, only uses a very limited set of environment variables. You may need to configure proxy variables for the cron invocation. Alternatively adding the proxy settings in config.php is possible too. The config.php file will be created in the upcoming steps. Review the following URL after you finished librenms install steps: https://docs.librenms.org/Support/Configuration/#proxy-support

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

Web installer

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

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

The web installer might prompt you to create a config.php file in your librenms install location manually, copying the content displayed on-screen to the file. If you have to do this, please remember to set the permissions on config.php after you copied the on-screen contents to the file. Run:

chown librenms:librenms /opt/librenms/config.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
• Alerting
• Device Groups
• 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 on what it is and how to enable it.

If you would like to help make LibreNMS better there are many ways to help. You can also back LibreNMS on Open Collective.