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如何延迟系统服务的启动或远程文件系统的挂载,直到网络完全可用

Solution In Progress - Updated -

Issue

  • 配置为绑定到特定 IP 地址的服务失败,并显示 Cannot assign requested address 或类似的错误消息

  • 配置为绑定到特定 IPv6 地址的服务无法启动,即使它被配置为在 network-online.target后启动

  • 配置为连接到特定 IPv6 地址的远程文件系统(如 NFS、CIFS)无法在引导时自动挂载

    [...] systemd[1]: remote.mount: Mounting timed out. Terminating.
    [...] remote.mount: Mount process exited, code=killed status=15
    [...] remote.mount: Failed with result 'timeout'.
    [...] systemd[1]: Failed to mount /remote.
    
  • 配置为连接到主机名的远程文件系统(如 NFS 和 CIFS)无法在引导时自动挂载

  • 作为 NFS 服务器服务的系统无法将其目录导出到 NFS 客户端

    [...] exportfs[XXX]: exportfs: Failed to resolve <some nfs client name>
    

Environment

  • Red Hat Enterprise Linux 7 及更新版本
    • systemd
    • dovecot, httpd, sshd, ...
    • NFS, CIFS
    • 使用名称解析时的 IPv6 和 IPv4

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