今天想了解一下参数icm/host_name_full到底需要如设置，网上一查原来如何呀（773830 - FQHN determination in ICM）
Symptom
It is not clear which fully qualified host name (FQHN) the Internet Communication Manager (ICM) is using.
Other Terms
Reason and Prerequisites
The following different variables and parameters are available for setting the host name.
- SAPLOCALHOST
- SAPLOCALHOSTFULL
- icm/host_name_full
Solution
The ICM sets the FQHN using the following hierarchy.
- 1. The parameter SAPLOCALHOSTFULL in the SAP profile (recommended for high availability configurations) has the highest priority. If it is set in a profile file, the ICM uses this value as the FQHN. Note: the system default value of SAPLOCALHOSTFULL contains the host name without domain, so the system default is ignored by the ICM.
- 2. If the parameter is not set, icm/host_name_full is analyzed.
- 3. If this parameter is not set either, the ICM uses the FQHN of the operating system. For this reason, check the settings of the hosts file at the operating system level.
The parameter SAPLOCALHOST is not fully qualified and is not used by ICM for the services.
We recommend that you set either SAPLOCALHOSTFULL (for HA configurations) or icm/host_name_full.
Note that SAPLOCALHOSTFULL or icm/host_name_full must correspond to the actual or virtual host name of the local instance. Do not set this parameter to the same value for different hosts. Refer also to note 962955.