由于 erlang 依赖项的版本不正确，无法安装 rabbitmq

Question

我安装了erlang 21.3：

$ erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().'  -noshell
"21"

但rabbitmq 安装程序不这么认为：

sudo apt-get install -y rabbitmq-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 rabbitmq-server : Depends: erlang-base (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            erlang-base-hipe (>= 1:21.3) but it is not going to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-crypto (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-eldap (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-inets (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-mnesia (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-os-mon (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-parsetools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-public-key (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-runtime-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-ssl (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-syntax-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-tools (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
                   Depends: erlang-xmerl (>= 1:21.3) but 1:20.2.2+dfsg-1ubuntu2 is to be installed or
                            esl-erlang (>= 1:21.3) but it is not installable
E: Unable to correct problems, you have held broken packages.

注意：以下问题类似——但对于RedHat 和yum install 指令并不直接适用于apt-get Installing RabbitMQ on Red Hat - wrong Erlang version

需要做什么来修复这个安装过程？我在ubuntu 18.0.4。

Answer 1

我在安装 elixir 时遇到了类似的问题。我认为原因是现有的 erlang 安装阻止了安装两个不同软件包提供的所需版本的 erlang。

对我来说，安装 esl-erlang 和 elixir 解决了这个问题，例如，sudo apt-get install elixir esl-erlang。因此，您可能需要显式安装所需版本的 erlang-base 或 esl-erlang。

Answer 2

以下命令序列将在 Ubuntu 18 上安装 Erlang 和 RabbitMQ，如 here 所述：

export DEBIAN_FRONTEND=noninteractive

apt-get update -y

apt-get install curl gnupg -y

curl -fsSL https://github.com/rabbitmq/signing-keys/releases/download/2.0/rabbitmq-release-signing-key.asc | apt-key add -

apt-get install apt-transport-https

tee /etc/apt/sources.list.d/bintray.rabbitmq.list <<EOF
deb https://dl.bintray.com/rabbitmq-erlang/debian bionic erlang
deb https://dl.bintray.com/rabbitmq/debian bionic main
EOF

apt-get update -y

apt-get install rabbitmq-server -y --fix-missing

until lsof -i:5672; do echo "Waiting for RabbitMQ to start..."; sleep 1; done
rabbitmq-plugins enable rabbitmq_management

如果您选择从源代码安装 Erlang，您需要自己安装，我建议使用 generic-unix RabbitMQ 包。

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