Docker: Ruby version upgrade from 2.2.0 to 2.4.0

Question

I am using Ruby version 2.2.0 in my Rails Application and Rails version is 4.2.0. Currently, Project is built through docker, so I am thinking of to upgrade the ruby version with 2.4.0 version.

I believe I need to change the docker image to upgrade the ruby version.

I already check a few of the articles but didn't get enough information.

Docker file

FROM ruby:2.2.0

RUN apt update && \
  apt install -y --no-install-recommends \
  git \
  curl \
  gnupg2 \
  libpq-dev \
  libmysqlclient-dev \
  nodejs \
  graphviz \
  && rm -rf /var/lib/apt/lists/*

Once ruby version upgraded then I will upgrade the rails version. Any help will be appreciated.

the last ruby version is 2.6.4, not 2.4.0. I'm not sure if I'm missing something... — Stefano, Oct 01 '19 at 09:34
@Mr. the question implies that I need to upgrade the ruby version — Rohit Lingayat, Oct 01 '19 at 10:40
@Stefano yes you're correct, I just want to upgrade the ruby version from 2.2.0 to 2.4.0 — Rohit Lingayat, Oct 01 '19 at 10:43
this will bring you to version 2.6.4, if you want to go with v. 2.4 you can try with `FROM ruby:2.4` (but it'll bring you v. 2.4.7) — Stefano, Oct 01 '19 at 10:46

score 1 · Answer 1 · answered Oct 01 '19 at 18:06

1

You can always build your own Docker image as such:

FROM ubuntu

RUN apt-get update
RUN apt-get install -y build-essential wget

RUN wget --no-check-certificate -O ruby-install.tar.gz https://github.com/postmodern/ruby-install/archive/master.tar.gz
RUN tar -xzvf ruby-install.tar.gz
RUN cd ruby-install-master && make install
RUN cd /
RUN rm -rf ruby-install-master && rm -rf ruby-install.tar.gz

RUN ruby-install --latest
RUN ruby-install -i /usr/local/ ruby 2.4.0 -- --disable-install-doc

RUN gem update --system --no-document
RUN gem install bundler --force

answered Oct 01 '19 at 18:06

Kris

19,188
9
91
111

we can do this for the existing project, right? I asked this because I am new docker. – Rohit Lingayat Oct 03 '19 at 08:36
@RohitLingayat It depends what you mean, you could incorporate some or all of the above in to an existing Dockerfile. – Kris Oct 03 '19 at 14:07

score 0 · Answer 2 · answered Oct 01 '19 at 10:54

depends on how one manages ruby application and ruby version. here are few things i would offer to check:

update Gemfile if bundler is used
```
$ cat Gemfile | head -n 1
ruby '2.4.0'
```
update .ruby-version if rbenv or [rvm][3] is used
```
$ cat .ruby-version
2.4.0
```

update Dockerfile if docker is used

$ cat Dockerfile | grep FROM
FROM ruby:2.4.0

Docker: Ruby version upgrade from 2.2.0 to 2.4.0

2 Answers2