Then I start the installation of zcs and everything goes smooth until just before the LDAP installation starts. The zcs install is partially putting back in place the systemd-resolved system and killing DNS which causes the LDAP install to go flaky. Sometimes I can put the real resolv.conf back in place in time before it borks. But in general this doesn't give me confidence that something else isn't getting borked.
Also, I thought it may have possibly been the zimbra dnscache install that was causing this issue. It is not. If I choose to install without dnscache it still puts back in the linked version of resolv.conf and partially kills my DNS.
resolv.conf (correct, before install)
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nameserver 127.0.0.1
nameserver 10.1.1.7
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# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.1