不久前，我根据文档设置了一个 systemd 服务，以便在网络上线后运行。\n这是单元文件：
\n[Unit]\nDescription=Refresh Pacman mirrorlist with Reflector.\nDocumentation=https://wiki.archlinux.org/index.php/Reflector\nWants=network-online.target\nAfter=network-online.target nss-lookup.target\n\n[Service]\nType=oneshot\nExecStart=/usr/bin/reflector @/etc/xdg/reflector/reflector.conf\nCacheDirectory=reflector\nCapabilityBoundingSet=~CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_CHOWN CAP_FSETID CAP_SETFCAP CAP_DAC_OVERRIDE CAP_DAC_READ_SEARCH CAP_FOWNER CAP_IPC_OWNER CAP_NET_ADMIN CAP_SYS_TIME CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE CAP_KILL CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SYS_NICE CAP_SYS_RESOURCE CAP_MAC_ADMIN CAP_MAC_OVERRIDE CAP_SYS_BOOT CAP_LINUX_IMMUTABLE CAP_IPC_LOCK CAP_SYS_CHROOT CAP_BLOCK_SUSPEND CAP_LEASE CAP_SYS_PACCT CAP_SYS_TTY_CONFIG CAP_WAKE_ALARM\nEnvironment=XDG_CACHE_HOME=/var/cache/reflector\nLockPersonality=true\nMemoryDenyWriteExecute=true\nNoNewPrivileges=true\nPrivateDevices=true\nPrivateTmp=true\nPrivateUsers=true\nProtectClock=true\nProtectControlGroups=true\nProtectHome=true\nProtectHostname=true\nProtectKernelTunables=true\nProtectKernelLogs=true\nProtectKernelModules=true\nProtectSystem=strict\nReadOnlyPaths=/etc/xdg/reflector/reflector.conf\nReadWritePaths=/etc/pacman.d/mirrorlist\nRemoveIPC=true\nRestrictAddressFamilies=~AF_AX25 AF_IPX AF_APPLETALK AF_X25 AF_DECnet AF_KEY AF_NETLINK AF_PACKET AF_RDS AF_PPPOX AF_LLC AF_IB AF_MPLS AF_CAN AF_TIPC AF_BLUETOOTH AF_ALG AF_VSOCK AF_KCM AF_UNIX AF_XDP\nRestrictNamespaces=true\nRestrictRealtime=true\nRestrictSUIDSGID=true\nSystemCallArchitectures=native\nSystemCallFilter=@system-service\nSystemCallFilter=~@resources @privileged\nUMask=177\n\n[Install]\nWantedBy=multi-user.target\n根据文档，该服务应该已正确设置以等待建立网络连接（即：我已登录，NetworkManager 已连接到 WiFi 并且系统已分配了 IP）。
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network-online.target是一个主动等待网络“up”的目标，其中“up”的定义由网络管理软件定义。通常它表示某种已配置的、可路由的 IP …