Update alias.rst

[stasic]

If a zone is operated with different nameserver software than PowerDNS and ALIAS is used it could result in an out-of-sync sencondary.

Short description

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 6492285293

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 47 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.02%) to 56.357%

---

Files with Coverage Reduction	New Missed Lines	%
pdns/sstuff.hh	1	60.24%
pdns/dbdnsseckeeper.cc	2	85.61%
pdns/iputils.hh	2	73.66%
pdns/misc.cc	2	61.32%
pdns/channel.hh	3	55.97%
pdns/dnsdistdist/dnsdist-healthchecks.cc	3	55.31%
pdns/stubresolver.cc	3	81.63%
pdns/tcpiohandler.cc	3	66.83%
pdns/test-distributor_hh.cc	3	88.66%
pdns/dnsdist.cc	5	71.05%

Totals
Change from base Build 6486035458:	-0.02%
Covered Lines:	102357
Relevant Lines:	151170

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💛 - Coveralls

[klaus-nicat]

I would add the sentence:
"To keep secondary nameservers up2date with the ALIAS target, you have to periodically retransfer the zone from PowerDNS, to force ALIAS-resolving during AXFR. This can be done either "dumb", for example every minute, or implement some "out of band" logic to retransfer zones only if the ALIAS target actually changed."

[Habbie]

and please look at Klaus' comment, thanks!

[pieterlexis]

@Habbie I addressed the review comments myself and updated the PR.

is done

[miodvallat]

Don't forget to add a signed-off line to your commit (maybe squash?)

[pieterlexis]

Don't forget to add a signed-off line to your commit (maybe squash?)

This is because the original submitter did not sign off (in the first commit), as that was not a requirement at the time. I could squash all commits and remove the submitter as the author, but that feels wrong.

[miodvallat]

But you can sign-off for the original author.