在Red Hat上安装RabbitMQ - Erlang版本错误。

Question

我正在尝试在一台Red Hat评估虚拟机上安装RabbitMQ（Enterprise Linux 7 64位工作站版本），并按照https://www.rabbitmq.com/install-rpm.html的说明进行操作。我已经从https://github.com/rabbitmq/erlang-rpm安装了零依赖版本的Erlang。这个安装没有出现错误，并且我将它的/bin目录添加到了我的路径中。

但是，当我尝试使用yum install rabbitmq-server-3.7.4-1.el7.noarch.rpm安装RabbitMQ时，它失败并告诉我它需要Erlang版本>=19.3，即使我已经从源代码安装了最新版本的Erlang（OTP v20.3）。下面是我尝试安装RabbitMQ时的完整输出：

$ sudo yum install rabbitmq-server-3.7.4-1.el7.noarch.rpm
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-
              : manager
Examining rabbitmq-server-3.7.4-1.el7.noarch.rpm: rabbitmq-server-3.7.4-1.el7.noarch
Marking rabbitmq-server-3.7.4-1.el7.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package rabbitmq-server.noarch 0:3.7.4-1.el7 will be installed
--> Processing Dependency: erlang >= 19.3 for package: rabbitmq-server-3.7.4-1.el7.noarch
--> Processing Dependency: socat for package: rabbitmq-server-3.7.4-1.el7.noarch
--> Running transaction check
---> Package rabbitmq-server.noarch 0:3.7.4-1.el7 will be installed
--> Processing Dependency: erlang >= 19.3 for package: rabbitmq-server-3.7.4-1.el7.noarch
---> Package socat.x86_64 0:1.7.3.2-2.el7 will be installed
--> Finished Dependency Resolution
Error: Package: rabbitmq-server-3.7.4-1.el7.noarch (/rabbitmq-server-3.7.4-1.el7.noarch)
           Requires: erlang >= 19.3
**********************************************************************
yum can be configured to try to resolve such errors by temporarily enabling
disabled repos and searching for missing dependencies.
To enable this functionality please set 'notify_only=0' in /etc/yum/pluginconf.d/search-disabled-repos.conf
**********************************************************************

Error: Package: rabbitmq-server-3.7.4-1.el7.noarch (/rabbitmq-server-3.7.4-1.el7.noarch)
           Requires: erlang >= 19.3
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

- Cazra

Answer 1

我自己找到了如何获取正确版本的Erlang，以便Rabbit MQ可以安装在我的Red Hat版本上。这是我所做的：

在`/etc/yum.repos.d`中，我创建了一个名为`rabbitmq-erlang.repo`的文件，并将以下内容添加到其中：

# In /etc/yum.repos.d/rabbitmq-erlang.repo
[rabbitmq-erlang]
name=rabbitmq-erlang
baseurl=https://dl.bintray.com/rabbitmq/rpm/erlang/19/el/7
gpgcheck=1
gpgkey=https://dl.bintray.com/rabbitmq/Keys/rabbitmq-release-signing-key.asc
repo_gpgcheck=0
enabled=1

接下来，我使用以下命令安装了Rabbit MQ，并且它能够自动安装我所需的正确版本的Erlang：

rpm --import https://dl.bintray.com/rabbitmq/Keys/rabbitmq-release-signing-key.asc
yum install rabbitmq-server-3.7.4-1.el7.noarch.rpm

- Cazra