Can't install mysql gem on Percona-XtraDB-Cluster - mysql

Question

I saw there few topics about this problem, but none of them solved my problem.
So. Platform is CentOS 6.6. I have installed Percona-XtraDB-Cluster, their mysql-libs and their devel packages.
Also i have there ruby 2.0.0 and rubygems 2.4.3. Now i am trying to install mysql gem. What i am getting:
Building native extensions. This could take a while... ERROR: Error
installing mysql: ERROR: Failed to build gem native extension.
/opt/sensu/embedded/bin/ruby -r ./siteconf20141114-16854-1fyrg9v.rb extconf.rb checking for
mysql_ssl_set()... * 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 --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=/opt/sensu/embedded/bin/ruby --with-mysql-config
--without-mysql-config
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:434:in try_do': The
compiler failed to generate an executable file. (RuntimeError) You
have to install development tools first. from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:519:intry_link0' from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:534:in try_link' from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:720:intry_func' from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:1004:in block in
have_func' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:895:in
block in checking_for' from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:340:in block (2 levels) in
postpone' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:310:in
open' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:340:in block
in postpone' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:310:in
open' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:336:in
postpone' from /opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:894:in
checking_for' from
/opt/sensu/embedded/lib/ruby/2.0.0/mkmf.rb:1003:in have_func' from
extconf.rb:45:in'
extconf failed, exit code 1
Gem files will remain installed in
/opt/sensu/embedded/lib/ruby/gems/2.0.0/gems/mysql-2.9.1 for
inspection. Results logged to
/opt/sensu/embedded/lib/ruby/gems/2.0.0/extensions/x86_64-linux/2.0.0/mysql-2.9.1/gem_make.out
Any of described solutions, which i found on the web didn't help me, so, maybe someone had similar problems with this Percona cluster and ruby-2.0.0 and gem mysql-2.9.1

Answer 1

Looks like you need development libraries for the Ruby gem MySQL with SSL:
Try each of these:
yum install gcc
yum install mysql mysql-devel mysql-server
yum install openssl openssl-devel
yum install ruby-devel
Then try installing the newer mysql2 gem:
gem install mysql2 --version '>=0.3.17'
Sensu expects SSL, so it is good to have it. The Sensu documentation says " It is possible to use Sensu without SSL, however, it is heavily discouraged. The following instructions use a tool to generate self-signed OpenSSL certificates". Read about how to enable SSL here:
http://sensuapp.org/docs/latest/certificates#documentation
If you want SSL, you may want to ensure that your database does have SSL enabled:
> show variables like '%ssl%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| have_openssl | YES |
| have_ssl | YES |
...
You wrote in the comment that you can't install mysql-devel and mysql-server because they will conflict with percona. My guess is that the error is the older mysql gem and/or the need for SSL.
If you are using rvm, it can also cause these kinds of glitches. You may want to try ruby-install and installing the current ruby. This may bring in the dependencies you need. If you want, you can use ruby-install in a custom directory, like this:
$ ruby-install ruby 2.1.5 --install-dir ~/foo/bar/
If you are using sudo gem install, it can also cause glitches for native gems. You may want to try becoming root, and using the actual root environment, and the root ruby version, and double-checking that the ruby version is what you expect, like this:
$ sudo su -
# which ruby
# ruby --version
# gem install mysql2 --version '>=0.3.17'