- instantclient basic + sqlplus is needed
- tnsping is needed too, which is not provided at least for recent versions I created /usr/lib/oracle/19.6/client64/bin/tnsping, that just calls exit 0 (if tnsping fails, mk_oracle falls back to host:port/sid, which does not make sense for me..)
cd /etc/check_mk
unzip /path/to/cloudwallet/wallet_DB205632611318.zip
# edit path in sqlnet.ora
perl -pi.bak -e 's-DIRECTORY=".*"-DIRECTORY="/etc/check_mk"-g' sqlnet.ora