系统信息

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                   -`                 
                  .o+`                 root@alarmpi
                 `ooo/                 OS: Arch Linux 
                `+oooo:                Kernel: armv7l Linux 4.19.93-1-ARCH
               `+oooooo:               Uptime: 1h 26m
               -+oooooo+:              Packages: 620
             `/:-:++oooo+:             Shell: bash 5.0.11
            `/++++/+++++++:            Disk: 5.5G / 111G (6%)
           `/++++++++++++++:           CPU: ARMv7 rev 3 (v7l) @ 4x 1.5GHz
          `/+++ooooooooooooo/`         RAM: 301MiB / 3914MiB
         ./ooosssso++osssssso+`       
        .oossssso-````/ossssss+`      
       -osssssso.      :ssssssso.     
      :osssssss/        osssso+++.    
     /ossssssss/        +ssssooo/-    
   `/ossssso+/:-        -:/+osssso+-  
  `+sso+:-`                 `.-/+oso: 
 `++:.                           `-/+/
 .`                                 `/

DNS无法解析

修改/etc/hosts。
修改nano /etc/systemd/resolved.conf中DNSSEC=no。

根文件所在分区

修改/boot/cmdline.txt，root=UUID=<your disk UUID>。

装Nextcloud服务器时遇到的问题

Arch Linux ARM Archieve Repository

降级php=7.4 -> php=7.3；

alarm archieve repo

apcu版本太高导致internal error

修改 /etc/php/php.ini 中 error_log = /var/log/php_errors.log。
cat error_log = /var/log/php_errors.log，发现：[08-Jan-2020 03:32:08 UTC] PHP Warning: PHP Startup: Unable to load dynamic library 'apcu' (tried: /usr/lib/php/modules/apcu (/usr/lib/php/modules/apcu: cannot open shared object file: No such file or directory), /usr/lib/php/modules/apcu.so (/usr/lib/php/modules/apcu.so: undefined symbol: php_error_docref)) in Unknown on line 0。于是推断原因是apcu版本不对，下一个旧版安装解决问题。

Transmission daemon

transmission-cli

nano /usr/lib/systemd/system/transmission.service & /var/lib/transmission/.config/transmission-daemon/settings.json