how to install typhoeus usccessfully?

[yanrong1990]

Problem

I would build my own fluentd image and set http_backend.This is my Dockerfile to install typhoeus

FROM fluent/fluentd:v1.5-1

# Use root account to use apk
USER root

# below RUN includes plugin as examples elasticsearch is not required
# you may customize including plugins as you wish
RUN apk add --no-cache --update --virtual .build-deps \
        sudo build-base ruby-dev \
 && sudo gem install fluent-plugin-elasticsearch \
 && sudo gem install typhoeus \
 && sudo gem sources --clear-all \
 && apk del .build-deps \
 && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem

COPY fluent.conf /fluentd/etc/

USER fluent

Also I add 'http_backend typhoeus' into fluent.conf. But the image cannot work at all and say: no typhoeus found.
Is there any problem with it? any suggestion will be helpful.
...

Steps to replicate

Either clone and modify https://gist.github.com/pitr/9a518e840db58f435911

OR

Provide example config and message

Expected Behavior or What you need to ask

...

Using Fluentd and ES plugin versions

• OS version
• Bare Metal or within Docker or Kubernetes or others?
  Kubernetes
• Fluentd v0.12 or v0.14/v1.0
  • paste result of fluentd --version or td-agent --version
    v0.12
• ES plugin 3.x.y/2.x.y or 1.x.y
  • paste boot log of fluentd or td-agent
  • paste result of fluent-gem list, td-agent-gem list or your Gemfile.lock
• ES version (optional)
  ES 6.5.4
• ES template(s) (optional)

[cosmo0920]

You should add a line to install libcurl. Because typhoeus requests to load libcurl.so.

FROM fluent/fluentd:v1.5-1

# Use root account to use apk
USER root

# below RUN includes plugin as examples elasticsearch is not required
# you may customize including plugins as you wish
RUN apk add --no-cache --update --virtual .build-deps \
        sudo build-base ruby-dev \
 # This line is needed.
 && apk add libcurl \
 && sudo fluent-gem install fluent-plugin-elasticsearch \
 && sudo fluent-gem install typhoeus \
 && sudo fluent-gem sources --clear-all \
 && apk del .build-deps \
 && rm -rf /tmp/* /var/tmp/* /usr/lib/ruby/gems/*/cache/*.gem

COPY fluent.conf /fluentd/etc/

USER fluent