start_script.sh failed to replace db url with _ underscore in conn string

[jgu2]

Source:

echo ${DB_HOST}
if [ -z ${DB_HOST} ] ; then
    local_host=`hostname -i`
    sed "s_localhost_${local_host}_" conf/storage/db.conf.sample > conf/storage/db.conf
else
    sed "s_localhost_${DB_HOST}_" conf/storage/db.conf.sample > conf/storage/db.conf
fi

Issue:
sed failed to replace db url with _ underscore in conn string, e.g.

$ sed "s_localhost_mongodb://user_name:LADo$iu47&dlahj%a@mongodb-host.com:12345/?a=true&b=foo&c=bar" conf/storage/db.conf.sample > conf/storage/db.conf
sed: 1: "s_localhost_mongodb://f ...": bad flag in substitute command: 'n'

Potential solutions:

1. It maybe use other delimiter that not in string with sed.
2. use jq, e.g. jq '.timeseries.url = "mogodb://..."' conf/storage/db.conf.sample.
3. jinja template in Python bindings - https://jinja.palletsprojects.com/