An error occurred while installing pg (0.17.1), and Bundler cannot continue.

capistranoで発行しようとしてbundle install でエラー。

どハマりしたのでメモ。

環境

• CentOS Linux release 7.1.1503 (Core)

エラー内容

Tasks: TOP => deploy:updated => bundler:install
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing on host conohaprod: bundle exit status: 5
bundle stdout: An error occurred while installing pg (0.17.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.17.1'` succeeds before bundling.
bundle stderr: Nothing written

言われるがままgem installしてみる。

$ gem install pg -v '0.17.1'
Fetching: pg-0.17.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /home/unityroom_production/.rbenv/versions/2.2.2/bin/ruby -r ./siteconf20151213-13863-1v1d25d.rb extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/unityroom_production/.rbenv/versions/2.2.2/bin/$(RUBY_BASE_NAME)
    --with-pg
    --without-pg
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config
    --with-pg-dir
    --without-pg-dir
    --with-pg-include
    --without-pg-include=${pg-dir}/include
    --with-pg-lib
    --without-pg-lib=${pg-dir}/lib

extconf failed, exit code 1

Gem files will remain installed in /home/unityroom_production/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/pg-0.17.1 for inspection.
Results logged to /home/unityroom_production/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/extensions/x86_64-linux/2.2.0-static/pg-0.17.1/gem_make.out

２つエラーしてる？

• checking for pg_config... no
• checking for libpq-fe.h... no

対応

とりあえずcapistranoは忘れて手作業でbundle installを通す。

参考：Ruby - gem install pgしてNo pg_configとなる対処法 - Qiita

この記事でbundleに--with-pg-configを渡す方法が書かれてた。

$ find / -name pg_config
/usr/pgsql-9.4/bin/pg_config
$ bundle config build.pg --with-pg-config=/usr/pgsql-9.4/bin/pg_config
$ bundle install

これでpg_configに対するエラーは消えた。

残すはlibpq-fe.hのみ。

参考：gem install pgでエラー……めっちゃはまった。｜ALVIS

それはこっちの記事が参考になった。

# yum search postgresql-devel
postgresql-devel.x86_64 : PostgreSQL development header files and libraries
# yum install postgresql-devel.x86_64

$ find / -name libpq-fe.h
/usr/include/libpq-fe.h
$ bundle install

これでgem install pgは通った！！（別のgemでエラーしたけどｗ）

上記作業をansibleのplaybookに反映する必要があるけどそれはなんとかなるだろう・・・。

findコマンド初めて使ったけどちょー便利だな・・・

追記

ConohaVPSを再作成して最初からpostgresql-devel.x86_64をインストールしたら --with-pg-configを指定しなくても通った。そっちが原因だったのか・・・。