Rocket Chat cannot enable SSL using Caddy: libdns.so.162 not found

Question

I installed rocket chat using snap, following the documentation here.

Now I am trying to enable SSL following the documentation: Auto SSL with Snaps. However, the following error shows up:

$ sudo snap set rocketchat-server https=enable
error: cannot perform the following tasks:
- Run configure hook of "rocketchat-server" snap (run hook "configure": 
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dig: error while loading shared libraries: libdns.so.162: cannot open shared object file: No such file or directory
Error: Can't resove DNS query for <my_domain_name>, check your DNS configuration, disabling https ...
-----)

Checking what ldd has to say for dig, I found few other libs are also not found:

$ ldd /snap/rocketchat-server/current/usr/bin/dig 
    linux-vdso.so.1 (0x0000ffff98afc000)
    libdns.so.162 => not found
    liblwres.so.141 => not found
    libbind9.so.140 => not found
    libisccfg.so.140 => not found
    libisc.so.160 => not found
    libpthread.so.0 => /lib/aarch64-linux-gnu/libpthread.so.0 (0x0000ffff98a71000)
    libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff98900000)
    /lib/ld-linux-aarch64.so.1 (0x0000ffff98acc000)

So, checked if libdns.so exists at all.

$ locate libdns.so
/snap/rocketchat-server/1437/usr/lib/aarch64-linux-gnu/libdns.so.162
/snap/rocketchat-server/1437/usr/lib/aarch64-linux-gnu/libdns.so.162.1.3
/usr/lib/aarch64-linux-gnu/libdns.so.1601
/usr/lib/aarch64-linux-gnu/libdns.so.1601.0.0

It appears that the concerned library exists under snap.

Is there a way to resolve this and make caddy/https work?

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System:

• Raspberry Pi 4 (aarch64)
• Linux ubuntu 5.4.0-1022-raspi
• Ubuntu Server 20.04.1 LTS

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Similar issues:

• dig: error while loading shared libraries: libdns.so.162: cannot open shared object file: No such file or directory
• shared libraries of dig and nslookup

Answer 1

Try to do a soft-link to library in your file system

ln -s /snap/rocketchat-server/1437/usr/lib/aarch64-linux-gnu/libdns.so.162 /lib

Or install dns-utils which should add missing lib to your system.