LibreNMS Error Fix

今天一早起來發現LibreNMS 出現錯誤
提醒執行以下命令
./scripts/composer_wrapper.php install --no-dev

但發生錯誤題是如下：

Do not run Composer as root/super user! See https://getcomposer.org/root for details
> LibreNMS\ComposerHelper::preInstall
Loading composer repositories with package information
Installing dependencies from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for erusev/parsedown 1.7.1 -> satisfiable by erusev/parsedown[1.7.1].
    - erusev/parsedown 1.7.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 2
    - Installation request for laravel/framework v5.4.36 -> satisfiable by laravel/framework[v5.4.36].
    - laravel/framework v5.4.36 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 3
    - laravel/framework v5.4.36 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
    - oriceon/toastr-5-laravel dev-master requires illuminate/session >=5.0.0 -> satisfiable by laravel/framework[v5.4.36].
    - Installation request for oriceon/toastr-5-laravel dev-master -> satisfiable by oriceon/toastr-5-laravel[dev-master].

==========================================
查詢後因為沒有安裝套件phpX.X-mbstring

故針對個人主機的PHP版本安裝

yum install php70w-mbstring

之後提示變更了，顯示為無法讀取資料夾

/opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/logs

提示變更權限，但依指令操作無效，全改為

chmod 755 -R /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/logs

無效

故只好以

chmod 777 -R /opt/librenms/bootstrap/cache /opt/librenms/storage /opt/librenms/logs

恢復正常