I tried the instructions described in the Blogpost Bootstrap DS215j to install optware for ds215j but was unsatisfied with the long outdated packages it provided. Luckily, there now is optware-ng which is a fork of optware and provides recent packages.
This is how I managed to install optware-ng on my Synology ds215j inspired by the instructions in the Gist Boostrap the Synology DS215j with optware, ipkg, and sudo:
# become root
sudo -i
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| # input: fullchain.pem and privkey.pem as generated by the "letsencrypt-auto" script when run with | |
| # the "auth" aka "certonly" subcommand | |
| # convert certificate chain + private key to the PKCS#12 file format | |
| openssl pkcs12 -export -out keystore.pkcs12 -in fullchain.pem -inkey privkey.pem -password pass:your_password | |
| # convert PKCS#12 file into Java keystore format | |
| keytool -importkeystore -srckeystore keystore.pkcs12 -srcstoretype PKCS12 -destkeystore keystore.jks -srcstorepass your_password -deststorepass your_password -noprompt | |
| # don't need the PKCS#12 file anymore |