在啟動 rabbitmq-server 時報錯：

2018-01-03 06:16:32.494 [info] <0.33.0> Application lager started on node [email protected]
2018-01-03 06:16:32.507 [info] <0.5.0> Log file opened with Lager
2018-01-03 06:16:33.438 [error] <0.5.0> 
Error description:
    init:do_boot/3
    init:start_em/1
    rabbit:start_it/1 line 454
    rabbit:broker_start/0 line 330
    rabbit_plugins:prepare_plugins/1 line 289
    rabbit_plugins:ensure_dependencies/1 line 263
throw:{error,{missing_dependencies,[crypto,ssl],
                                   [amqp10_client,cowboy,cowlib,rabbitmq_aws,
                                    rabbitmq_management,
                                    rabbitmq_management_agent,rabbitmq_shovel,
                                    rabbitmq_trust_store]}}
Log file(s) (may contain more information):
   /home/zhangcs/rabbitmq_server-3.7.2/var/log/rabbitmq/
 
[email protected]
   /home/zhangcs/rabbitmq_server-3.7.2/var/log/rabbitmq/[email protected]_upgrade.log

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18

根據異常提示，原先以為是缺少了OpenSSL，但是檢查後發現OpenSSL已經成功安裝

$ openssl version
OpenSSL 1.0.2g  1 Mar 2016

通過搜尋引擎找了半天沒收穫，最後卻在官網找到了相關資訊：在 “Debian-based systems” 上，Erlang支援OpenSSL需要安裝 erlang-ssl ；而我當前的系統 Ubuntu16.04TLS 正屬於Debian系

If you receive an error instead, confirm that Erlang was built with OpenSSL. On Debian-based systems you may need to install the erlang-ssl package.

1、檢查當前Erlang是否支援TSL/SSL

進入Erlang後使用命令 ssl:versions(). 檢查當前SSL版本

[email protected]:~/rabbitmq_server-3.7.2$ erl
Erlang/OTP 20 [erts-9.1] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:10] [kernel-poll:false]

Eshell V9.1  (abort with ^G)
1> ssl:versions().
** exception error: undefined function ssl:versions/0
2> halt().
 

2、安裝 erlang-ssl 後問題解決

$ sudo apt install erlang-ssl

• 1

安裝 erlang-ssl 後檢查SSL版本

[email protected]:~/rabbitmq_server-3.7.2$ erl
Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:2:2] [async-threads:10] [kernel-poll:false]

Eshell V7.3  (abort with ^G)
1> ssl:versions().
[{ssl_app,"7.3"},
 {supported,['tlsv1.2','tlsv1.1',tlsv1]},
 {available,['tlsv1.2','tlsv1.1',tlsv1,sslv3]}]
2> halt().

啟動 rabbitmq-server 時不再報錯