【原创】在CentOS 5.7上经过YUM安装Erlang的坑爹经历（更新）

      想要在虚拟机上的 Linux 环境下，从新搞一下 RabbitMQ 的相关实验，因此从新折腾了下如何操做：

Since RabbitMQ is written in Erlang, we need to have installed the language libraries to run the broker.

      首先仍是要把 Erlang 的安装搞定，最简单的方式是直接重 官网 上下载源码包或rpm包再安装，可是我是个喜欢折腾的人，因此我选择了另一种“比较笨拙”的方式 - 即经过 Linux 系统自带的包管理工具进行安装。

按照 www.erlang-solutions.com 上的说明：

RPM-based Linux distributions RPM packages are signed. To add Erlang Solutions key to execute command: 

# rpm --import http://binaries.erlang-solutions.com/debian/erlang_solutions.asc

Users of Fedora can add this file to /etc/yum.repos.d/ Users of Centos can add this file to /etc/yum.repos.d/ ( RPM Forge must be also added to repos)

其中 erlang_solutions.asc 内容以下：

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

mQINBE8v+uABEACgAlBUDDjc6PF7uI6mlTGnkemHF4trRINtocZKzvyKBmN+pPiV
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ctmKvzuuerI6mVQjg/80PJ4fEV0=
=VAR1
-----END PGP PUBLIC KEY BLOCK-----

其中用于 Centos 的 repo 文件内容以下：

[erlang-solutions]
name=Centos $releasever - $basearch - Erlang Solutions
baseurl=http://binaries.erlang-solutions.com/rpm/centos/$releasever/$basearch
gpgcheck=1
gpgkey=http://binaries.erlang-solutions.com/debian/erlang_solutions.asc
enabled=1

按照上面的意思，须要先安装 RepoForge ， 在 RPM Forge 上看到的内容以下：

=====================================================

RPMforge for CentOS 5

The default RPMforge repository does not replace any CentOS base packages. In the past it used to, but those packages are now in a separate repository (rpmforge-extras) which is disabled by default.

You can find a complete listing of the RPMforge package packages at http://packages.sw.be/

Download the rpmforge-release package. Choose one of the two links below, selecting to match your host's architecture. If you are unsure of which one to use you can check your architecture with the command uname -i

• i386 http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm

• x86_64 http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm

The preferred rpmforge-release package to retrieve and to install in order to enable that repository is one of the two listed above.

Install DAG's GPG key

rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

Verify the package you have downloaded

rpm -K rpmforge-release-0.5.2-2.el5.rf.*.rpm

 Security warning: The rpmforge-release package imports GPG keys into your RPM database. As long as you have verified the md5sum of the key injection package, and trust Dag, et al., then it should be as safe as your trust of them extends.

Install the package

rpm -i rpmforge-release-0.5.2-2.el5.rf.*.rpm

This will add a yum repository config file and import the appropriate GPG keys.

Then try to install something like this

yum install htop

========================================================

      首先经过 uname -i 确认了个人系统是 i386 ；经过 wget 如今对应的 rpm 包后安装，此时会在 /etc/yum.repos.d 下多出 4 个 repo ：mirrors-rpmforge、mirrors-rpmforge-extras、mirrors-rpmforge-testing 和 rpmforge.repo 。

      接下来为了验证上述 repo 中确实能够找到我想安装的正确的 Erlang 版本，执行了命令 yum list|grep erlang ，结果以下：

[root@slave2 ~]# yum list|grep erlang
http://binaries.erlang-solutions.com/rpm/centos/5/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: erlang-solutions. Please verify its path and try again

      按照错误信息的意思，应该是路径不对了，故直接在浏览器中打开上面的 http 地址，发如今只有路径 http://binaries.erlang-solutions.com/rpm/centos/6/i386/ 是存在的，而没有对应 5 的路径，坑爹啊！！但是朕不死心，从新回到 https://www.erlang-solutions.com/downloads/download-erlang-otp 上检查全部可用的 Centos 上的 Erlang 版本，结果除了一个 R14B02 32bit 版本 Erlang 是用的 Centos 5.5 的，其他全是用于 6.0 的。尼玛，难道非要我装 Centos 6.0 才行？！思来想去，直接改 repo 信息欺骗网站说本身是 6.0 版本而后安装彷佛不是啥好注意，往后恐怕会惹上没必要要的麻烦；从新装个 6.0 的系统太烦，毕竟已有系统中有不少东西已经配置好了；直接认栽使用 R14B02 又不甘心。唉~~华山一条路，只能源码安装了~~~（此处省略N万字）

      另外，将 erlang-solutions 的 repo 去掉以后，执行 yum list|grep erlang 获得以下结果：

[root@slave2 ~]# yum list|grep erlang
ftp://ftp.oss.eznetsols.org/linux/centos/5.8/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error >
Trying other mirror.
erlang.i386                             R12B-5.12.el5.rf        rpmforge        
erlang-doc.i386                         R12B-5.12.el5.rf        rpmforge

repoforge 上的 Erlang 更老，朕是与时俱进的人，果断放弃！

=================== 2012-12-10 更新 =======================

鉴于有网友说使用 EPEL 比较好，全部本身也搞了下试试：

具体操做请参考网页：

1. http://www.rabbitmq.com/install-rpm.html
2. http://fedoraproject.org/wiki/EPEL
3. http://fedoraproject.org/wiki/EPEL/FAQ#howtouse

最后说一下结论：

      就 Erlang 的包安装而言，EPEL 确实要比 repoforge 新，目前提供的最新版本为 R14B-04。这一点不管是从 repo 文件中仍是直接从 http://repos.fedorapeople.org/repos/peter/erlang/epel-5/i386/ 上均可以看出。

      上面都弄好后，执行 yum 命令显示，能够找到 Erlang 安装包。

[root@slave2 yum.repos.d]# yum list|grep erlang
ftp://ftp.oss.eznetsols.org/linux/centos/5.8/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error >
Trying other mirror.
erlang.i386                             R14B-04.1.el5           epel-erlang     
erlang-appmon.i386                      R14B-04.1.el5           epel-erlang     
erlang-asn1.i386                        R14B-04.1.el5           epel-erlang     
erlang-common_test.i386                 R14B-04.1.el5           epel-erlang     
erlang-compiler.i386                    R14B-04.1.el5           epel-erlang     
erlang-cosEvent.i386                    R14B-04.1.el5           epel-erlang     
erlang-cosEventDomain.i386              R14B-04.1.el5           epel-erlang     
erlang-cosFileTransfer.i386             R14B-04.1.el5           epel-erlang     
erlang-cosNotification.i386             R14B-04.1.el5           epel-erlang     
erlang-cosProperty.i386                 R14B-04.1.el5           epel-erlang     
erlang-cosTime.i386                     R14B-04.1.el5           epel-erlang     
erlang-cosTransactions.i386             R14B-04.1.el5           epel-erlang     
erlang-crypto.i386                      R14B-04.1.el5           epel-erlang     
erlang-debugger.i386                    R14B-04.1.el5           epel-erlang     
erlang-debuginfo.i386                   R14B-04.1.el5           epel-erlang     
erlang-dialyzer.i386                    R14B-04.1.el5           epel-erlang     
erlang-diameter.i386                    R14B-04.1.el5           epel-erlang     
erlang-doc.i386                         R14B-04.1.el5           epel-erlang     
erlang-docbuilder.i386                  R14B-04.1.el5           epel-erlang     
erlang-edoc.i386                        R14B-04.1.el5           epel-erlang     
erlang-erl_docgen.i386                  R14B-04.1.el5           epel-erlang     
erlang-erl_interface.i386               R14B-04.1.el5           epel-erlang     
erlang-erts.i386                        R14B-04.1.el5           epel-erlang     
erlang-et.i386                          R14B-04.1.el5           epel-erlang     
erlang-eunit.i386                       R14B-04.1.el5           epel-erlang     
erlang-examples.i386                    R14B-04.1.el5           epel-erlang     
erlang-gs.i386                          R14B-04.1.el5           epel-erlang     
erlang-hipe.i386                        R14B-04.1.el5           epel-erlang     
erlang-ic.i386                          R14B-04.1.el5           epel-erlang     
erlang-inets.i386                       R14B-04.1.el5           epel-erlang     
erlang-inviso.i386                      R14B-04.1.el5           epel-erlang     
erlang-jinterface.i386                  R14B-04.1.el5           epel-erlang     
erlang-kernel.i386                      R14B-04.1.el5           epel-erlang     
erlang-megaco.i386                      R14B-04.1.el5           epel-erlang     
erlang-mnesia.i386                      R14B-04.1.el5           epel-erlang     
erlang-observer.i386                    R14B-04.1.el5           epel-erlang     
erlang-odbc.i386                        R14B-04.1.el5           epel-erlang     
erlang-orber.i386                       R14B-04.1.el5           epel-erlang     
erlang-os_mon.i386                      R14B-04.1.el5           epel-erlang     
erlang-otp_mibs.i386                    R14B-04.1.el5           epel-erlang     
erlang-parsetools.i386                  R14B-04.1.el5           epel-erlang     
erlang-percept.i386                     R14B-04.1.el5           epel-erlang     
erlang-pman.i386                        R14B-04.1.el5           epel-erlang     
erlang-public_key.i386                  R14B-04.1.el5           epel-erlang     
erlang-reltool.i386                     R14B-04.1.el5           epel-erlang     
erlang-runtime_tools.i386               R14B-04.1.el5           epel-erlang     
erlang-sasl.i386                        R14B-04.1.el5           epel-erlang     
erlang-snmp.i386                        R14B-04.1.el5           epel-erlang     
erlang-ssh.i386                         R14B-04.1.el5           epel-erlang     
erlang-ssl.i386                         R14B-04.1.el5           epel-erlang     
erlang-stdlib.i386                      R14B-04.1.el5           epel-erlang     
erlang-syntax_tools.i386                R14B-04.1.el5           epel-erlang     
erlang-test_server.i386                 R14B-04.1.el5           epel-erlang     
erlang-toolbar.i386                     R14B-04.1.el5           epel-erlang     
erlang-tools.i386                       R14B-04.1.el5           epel-erlang     
erlang-tv.i386                          R14B-04.1.el5           epel-erlang     
erlang-typer.i386                       R14B-04.1.el5           epel-erlang     
erlang-webtool.i386                     R14B-04.1.el5           epel-erlang     
erlang-wx.i386                          R14B-04.1.el5           epel-erlang     
erlang-xmerl.i386                       R14B-04.1.el5           epel-erlang