How to connect to sql server

I have tried installing tiny_tds, also tried activerecord-sqlserver-adapter but both give me the following error:

```
2019-10-14 07:21:34 +0000 [error]: #0 fluent/log.rb:362:error: Could not load the 'tiny_tds' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile. path=nil error_class=LoadError error="Could not load the 'tiny_tds' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile."
```

```
2019-10-14 07:21:34 +0000 [error]: #0 fluent/log.rb:362:error: Could not load the 'activerecord-sqlserver-adapter' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile. path=nil error_class=LoadError error="Could not load the 'activerecord-sqlserver-adapter' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile."
```

Dockerfile:
```
# AUTOMATICALLY GENERATED
# DO NOT EDIT THIS FILE DIRECTLY, USE /Dockerfile.template.erb

FROM alpine:3.9
LABEL maintainer "Fluentd developers "
LABEL Description="Fluentd docker image" Vendor="Fluent Organization" Version="1.7.3"

# Do not split this into multiple RUN!
# Docker creates a layer for every RUN-Statement
# therefore an 'apk delete' has no effect
RUN apk update \
&& apk add --no-cache \
ca-certificates linux-headers \
ruby ruby-irb ruby-etc ruby-webrick \
tini \
&& apk add --no-cache --virtual .build-deps \
build-base \
ruby-dev gnupg \
&& apk add freetds freetds-dev \
&& echo 'gem: --no-document' >> /etc/gemrc \
&& gem install tiny_tds -v 2.1.0 \
&& gem install fluent-plugin-sql -v 1.1.1 \
&& gem install activerecord-sqlserver-adapter -v 5.2.0 \
&& gem install oj -v 3.3.10 \
&& gem install json -v 2.2.0 \
&& gem install async-http -v 0.46.3 \
&& gem install fluentd -v 1.6.3 \
&& gem install bigdecimal -v 1.3.5 \
&& apk del .build-deps \
&& rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem

RUN addgroup -S fluent && adduser -S -g fluent fluent \
# for log storage (maybe shared with host)
&& mkdir -p /fluentd/log \
# configuration/plugins path (default: copied from .)
&& mkdir -p /fluentd/etc /fluentd/plugins \
&& chown -R fluent /fluentd && chgrp -R fluent /fluentd

COPY fluent.conf /fluentd/etc/
COPY entrypoint.sh /bin/

ENV FLUENTD_CONF="fluent.conf"

ENV LD_PRELOAD=""
EXPOSE 24224 5140

USER fluent
ENTRYPOINT ["tini", "--", "/bin/entrypoint.sh"]
CMD ["fluentd"]
```

conf
```

@type forward
port 24224
bind 0.0.0.0

@type stdout

@type sql
host ...
port 1433
database fluentd
adapter tiny_tds / activerecord-sqlserver-adapter
username ...
password ...


table dbo.logs
column_mapping 'timestamp:created_at,fluentdata1:dbcol1,fluentdata2:dbcol2,fluentdata3:dbcol3'
# This is the default table because it has no "pattern" argument in
# The logic is such that if all non-default blocks
# do not match, the default one is chosen.
# The default table is required.

```