Fixing ‘fatal error openssl/opensslv.h: No Such File or Directory’ on CentOS 7

runit needs runit-systemd for CouchDB control

I had exactly the same issue on Debian 10 and - as with a lot of CouchDB setup - the answer isn't easy to find.

However, a post on Ask Ubuntu pointed out that “the runit package does not provide a systemd unit file” —this is provided by runit-systemd, so…

‌sudo aptitude install runit-systemd did the job.

Before:

sudo sv status couchdb
warning: couchdb: unable to open supervise/ok: file does not exist

After:

sudo sv status couchdb
down: couchdb: 0s, normally up, want up; run: log: (pid 24238) 122s

You cannot run Docker on an OpenVZ "virtual machine", as it is not actually a virtual machine, but a (very old type of) container itself.

You will need a new VPS provider, which does not use OpenVZ or its commercial version Virtuozzo.