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Making changes to /etc and /var z/OS UNIX System Services Planning GA32-0884-00 |
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Because /etc and /var are symbolic links, and not directories, this difference affects how you install service and make updates when doing a system replace. Use the procedures in this topic if the installation process must create one or more directories, or you would like to copy files from one /etc or /var file system to another/etc or /var file system. The /etc file system is the location for your own customization data for products. You set up the /etc files and you maintain their content. The /var file system is the location for IBM® product information, that is created, used, and maintained by IBM products.IBM products might create directories under /etc or /var during installation, but IBM does not create files under /etc or /var during SMP/E installation. Because IBM products do not create files into /etc or /var, there is no possibility that SMP/E installation of an IBM product or service will overlay your own files within /etc or /var. Because /etc and /var are
symbolic links, not directories, they cannot receive product or service
code. If you are installing service or products that must write to /etc or /var,
you need to change /etc or /var to
a directory, install the code, and then change /etc or /var back
to a symbolic link. The sample JCL for those tasks are in SYS1.SAMPLIB;
they are:
Example:
If you are mounting a maintenance file system named MAINT.ETC at a symbolic link (/service/etc) that points to the /SYSTEM/etc mount point where the active file system (PROD.ETC) is mounted, you must convert the symbolic link to a directory first. Guideline: While you can mount on a
symbolic link that points to a directory, you must make sure that
the mount point that your symbolic link is pointing to is not still
mounted on by the original /etc file system.
For information on how to migrate the /etc and /var file systems during a system replace, see z/OS® V2.1 Migration "Migrate /etc and /var system control files |
Copyright IBM Corporation 1990, 2014
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