===== Ubuntu 20.04 安裝程序 =====
  * 安裝必要的套件 <cli>
apt install software-properties-common
add-apt-repository universe
apt update
apt install acl curl composer fping git graphviz imagemagick mailutils mariadb-client mariadb-server mtr-tiny nginx-full nmap php7.4-cli php7.4-curl php7.4-fpm php7.4-gd php7.4-json php7.4-mbstring php7.4-mysql php7.4-snmp php7.4-xml php7.4-zip rrdtool snmp snmpd whois unzip python3-pip python3-pymysql python3-dotenv python3-redis python3-setuptools python3-systemd
</cli>
  * 新增 librenms 帳號<cli>
useradd librenms -d /opt/librenms -M -r -s "$(which bash)"
</cli>
  * 下載 LibreNMS 系統<cli>
cd /opt
git clone https://github.com/librenms/librenms.git
</cli>
  * 設定 librenms 權限<cli>
chown -R librenms:librenms /opt/librenms
chmod 771 /opt/librenms
setfacl -d -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
setfacl -R -m g::rwx /opt/librenms/rrd /opt/librenms/logs /opt/librenms/bootstrap/cache/ /opt/librenms/storage/
</cli>
  * 安裝 PHP 相關套件<cli>
su - librenms
./scripts/composer_wrapper.php install --no-dev
exit
</cli>
  * 安裝 php composer<cli>
wget https://getcomposer.org/composer-stable.phar
mv composer-stable.phar /usr/bin/composer
chmod +x /usr/bin/composer
</cli>
  * 設定時區資料<cli>
vi /etc/php/7.4/fpm/php.ini
vi /etc/php/7.4/cli/php.ini
</cli><file>
:
date.timezone = "Asia/Taipei"
:
</file><cli>
timedatectl set-timezone Asia/Taipei
</cli>
  * 設定 MariaDB <cli>
vi /etc/mysql/mariadb.conf.d/50-server.cnf
--
[mysqld]
:
innodb_file_per_table=1
lower_case_table_names=0
:
--
systemctl enable mariadb
systemctl restart mariadb
</cli>
  * 修改 DB 密碼 **Password**<cli>
mysql -u root
--
CREATE DATABASE librenms CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
CREATE USER 'librenms'@'localhost' IDENTIFIED BY '**Password**';
GRANT ALL PRIVILEGES ON librenms.* TO 'librenms'@'localhost';
FLUSH PRIVILEGES;
exit
</cli>
  * 設定 PHP-FPM<cli>
cp /etc/php/7.4/fpm/pool.d/www.conf /etc/php/7.4/fpm/pool.d/librenms.conf
vi /etc/php/7.4/fpm/pool.d/librenms.conf
</cli>
    - 將 [www] 改成 [librenms]
    - 將 user 和 group 改成 "librenms"<cli>
user = librenms
group = librenms
</cli>
    - 將 listen 改成 /run/php-fpm-librenms.sock<cli>
listen = /run/php-fpm-librenms.sock
</cli>
  * 設定 Nginx 改 server_name 為實際的網址或 IP Exp. 10.20.0.34<cli>
vi /etc/nginx/conf.d/librenms.conf
</cli><file>
server {
 listen      80;
 server_name 10.20.0.34;
 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 ~ [^/]\.php(/|$) {
  fastcgi_pass unix:/run/php-fpm-librenms.sock;
  fastcgi_split_path_info ^(.+\.php)(/.+)$;
  include fastcgi.conf;
 }
 location ~ /\.(?!well-known).* {
  deny all;
 }
}
</file>
    * 重新啟動 nginx<cli>
rm /etc/nginx/sites-enabled/default
systemctl restart nginx
systemctl restart php7.4-fpm
</cli>
  * 啟動 lnms<cli>
ln -s /opt/librenms/lnms /usr/bin/lnms
cp /opt/librenms/misc/lnms-completion.bash /etc/bash_completion.d/
</cli>
  * 設定 snmpd <cli>
cp /opt/librenms/snmpd.conf.example /etc/snmp/snmpd.conf
vi /etc/snmp/snmpd.conf
---
將 RANDOMSTRINGGOESHERE 改成自己的 snmp 密碼
com2sec readonly  default         RANDOMSTRINGGOESHERE
:
--
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
</cli>
  * 設定 crontab <cli>
cp /opt/librenms/librenms.nonroot.cron /etc/cron.d/librenms
</cli>
  * 設定 logrotate<cli>
cp /opt/librenms/misc/librenms.logrotate /etc/logrotate.d/librenms
</cli>
  * 開啟網頁進行設定 Exp. http://10.20.0.34
    - 檢查設定
    - 設定資料庫與匯入基本資料 
    - 建立管理者帳號密碼
  * 如果有遇到問題可以執行以下語法進行檢測<cli>
sudo su - librenms
./validate.php
</cli>如果沒問題會顯示類似如下結果:<cli>
root@ct-librenms:/opt# sudo su - librenms
librenms@ct-librenms:~$ ./validate.php
====================================
Component | Version
--------- | -------
LibreNMS  | 21.4.0-3-gcea6f13bf
DB Schema | 2021_04_08_151101_add_foreign_keys_to_port_group_port_table (208)
PHP       | 7.4.3
Python    | 3.8.5
MySQL     | 10.3.25-MariaDB-0ubuntu0.20.04.1
RRDTool   | 1.7.2
SNMP      | NET-SNMP 5.8
====================================

[OK]    Composer Version: 2.0.12
[OK]    Dependencies up-to-date.
[WARN]  You have no devices.
        [FIX]: 
        Consider adding a device such as localhost: /addhost
[OK]    Database connection successful
[OK]    Database schema correct
librenms@ct-librenms:~$ 
</cli>