再一次处理问题中,执行了命令：systemctl enable /usr/lib/systemd/system/nfs-idmapd.service 报如 The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).错误,完整报错如下：

[root@ebs-73760 ~]# systemctl enable /usr/lib/systemd/system/nfs-idmapd.service
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
   .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
   a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
   D-Bus, udev, scripted systemctl call, ...).
4) In case of template units, the unit is meant to be enabled with some
   instance name specified.

解决方法：
编辑文件 /usr/lib/systemd/system/nfs-idmapd.service 在结尾增加install单元节点后再重新执行命令即可正常。

[Install]
WantedBy=multi-user.target

增加后完整内容如下：

[Unit]
Description=NFSv4 ID-name mapping service
DefaultDependencies=no
Requires=rpc_pipefs.target
After=rpc_pipefs.target local-fs.target

BindsTo=nfs-server.service

[Service]
Type=forking
ExecStart=/usr/sbin/rpc.idmapd

[Install]
WantedBy=multi-user.target

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