glibc 2.26 lifted restrictions on search domains count or length to unlimited. This has also been backported to 2.17 in some distributions (RHEL 7 and derivatives). Other softwares may have their own limits for search domains, but we should not restrict what is written out any more. https://sourceware.org/legacy-ml/libc-announce/2017/msg00001.html
System and Service Manager
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