更新：
如果我做：
yum upgrade
我懂了：
Skip Packages With Broken Dependencies When
我该如何解决？
旧帖：
我在这里找到了文件erl_crash.dump：
/var/lib/rabbitmq/erl_crash.dump
如果我这样做：
head -n 50 /var/lib/rabbitmq/erl_crash.dump
我得到：
=erl_crash_dump:0.5
Tue Mar 1 20:00:36 2022
Slogan: Kernel pid terminated (application_controller) ({application_start_failure,credentials_obfuscation,{{shutdown,{failed_to_start_child,credentials_obfuscaton_svc,{undef,[{crypto,macN,[hmac,sha256,<<185,
System version: Erlang/OTP 22 [erts-10.4.4] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1]
Compiled: Fri Sep 6 18:47:55 2019
Taints: crypto
Atoms: 13923
Calling Thread: scheduler:1
=scheduler:1
Scheduler Sleep Info Flags:
Scheduler Sleep Info Aux Work: THR_PRGR_LATER_OP
Current Port:
Run Queue Max Length: 0
Run Queue High Length: 0
Run Queue Normal Length: 0
Run Queue Low Length: 0
Run Queue Port Length: 0
Run Queue Flags: OUT_OF_WORK | HALFTIME_OUT_OF_WORK | NONEMPTY | EXEC
Current Process: <0.0.0>
Current Process State: Running
Current Process Internal State: ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | RUNNING
Current Process Program counter: 0x0000ffff5cd5d020 (init:printable_list/1 + 24)
Current Process CP: 0x0000ffff5cd5dcc8 (init:boot_loop/2 + 1944)
Current Process Limited Stack Trace:
0x0000ffff5a93b9f0:SReturn addr 0xACD16DC0 (<terminate process normally>)
我不知道怎么读这个。是failed_to_start_child错误吗？如果是，那是什么意思？我如何解决它？
我有一个新的 EC2 实例和一个全新的 Redhat8 安装，所有东西都安装了yumordnf但我在 RabbitMQ 上不断收到错误，它试图启动但立即失败。如果我做：
tail -n 500 /var/log/messages
然后我看到这条消息，一遍又一遍地重复：
Mar 1 18:23:47 ip-172-31-56-22 rabbitmq-server[350248]: {"Kernel pid terminated",application_controller,"{application_start_failure,credentials_obfuscation,{{shutdown,{failed_to_start_child,credentials_obfuscaton_svc,{undef,[{crypto,macN,[hmac,sha256,<<80,84,120,32,178,183,28,70,220,34,20,13,145,69,180,207,145,18,30,76,255,205,110,198,166,173,68,94,39,2,201,5,116,139,211,47,32,125,29,33,161,98,58,78,127,162,252,146,192,110,153,88,149,58,190,136,74,66,191,238,168,79,190,2,120,197,45,101,48,216,168,33,102,142,44,160,25,38,229,27,132,117,91,23,171,84,244,84,230,129,67,131,57,152,36,238,207,222,137,164,79,90,128,114,75,111,48,205,252,239,253,68,193,32,61,190,149,117,145,224,144,191,59,109,247,145,102,240>>,[<<167,114,26,126,33,160,146,70,65,253,176,24,5,41,155,193>>,<<0,0,0,1>>],32],[]},{credentials_obfuscation_pbe,xor_sum,7,[{file,\"src/credentials_obfuscation_pbe.erl\"},{line,160}]},{credentials_obfuscation_pbe,blocks,10,[{file,\"src/credentials_obfuscation_pbe.erl\"},{line,152}]},{credentials_obfuscation_pbe,make_key,5,[{file,\"src/credentials_obfuscation_pbe.erl\"},{line,94}]},{credentials_obfuscation_pbe,encrypt,5,[{file,\"src/credentials_obfuscation_pbe.erl\"},{line,76}]},{credentials_obfuscation_svc,check,3,[{file,\"src/credentials_obfuscation_svc.erl\"},{line,163}]},{credentials_obfuscation_svc,init_state,0,[{file,\"src/credentials_obfuscation_svc.erl\"},{line,133}]},{gen_server,init_it,2,[{file,\"gen_server.erl\"},{line,374}]}]}}},{credentials_obfuscation_app,start,[normal,[]]}}}"}
Mar 1 18:23:47 ip-172-31-56-22 rabbitmq-server[350248]: Kernel pid terminated (application_controller) ({application_start_failure,credentials_obfuscation,{{shutdown,{failed_to_start_child,credentials_obfuscaton_svc,{undef,[{crypto,macN,[hmac,sha256,<<80,8
Mar 1 18:23:47 ip-172-31-56-22 rabbitmq-server[350248]: #015
Mar 1 18:23:47 ip-172-31-56-22 rabbitmq-server[350248]: Crash dump is being written to: erl_crash.dump...done
Mar 1 18:23:47 ip-172-31-56-22 systemd[1]: rabbitmq-server.service: Main process exited, code=exited, status=1/FAILURE
Mar 1 18:23:47 ip-172-31-56-22 systemd[1]: rabbitmq-server.service: Failed with result 'exit-code'.
Mar 1 18:23:47 ip-172-31-56-22 systemd[1]: Failed to start RabbitMQ broker.
我正在努力思考问题所在。我相信我已经打开了所有必要的端口。
Crash dump is being written to: erl_crash.dump...done
我读过这个：
我已经在安全组上打开了 4369 端口，但这并没有帮助。
如果我运行：
epmd -names
我得到：
epmd: up and running on port 4369 with data
所以这是有效的，但 RabbitMQ 不是。
如果我这样做：
rabbitmqctl start_app
我得到：
Starting node rabbit@ip-172-31-56-22 ...
Error: unable to perform an operation on node 'rabbit@ip-172-31-56-22'. Please see diagnostics information and suggestions below.
Most common reasons for this are:
* Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
* CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
* Target node is not running
In addition to the diagnostics info below:
* See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more
* Consult server logs on node rabbit@ip-172-31-56-22
* If target node is configured to use long node names, don't forget to use --longnames with CLI tools
DIAGNOSTICS
===========
attempted to contact: ['rabbit@ip-172-31-56-22']
rabbit@ip-172-31-56-22:
* connected to epmd (port 4369) on ip-172-31-56-22
* epmd reports: node 'rabbit' not running at all
no other nodes on ip-172-31-56-22
* suggestion: start the node
Current node details:
* node name: 'rabbitmqcli-871-rabbit@ip-12-131-56-22'
* effective user's home directory: /var/lib/rabbitmq
* Erlang cookie hash: Gug6Jfak+f3/k+ww6vhA==
我的印象是安装失败。每当我使用时，我都会看到一些关于 RabbitMQ 的信息，即使我的命令与 RabbitMQ 无关。例如，我这样做：
sudo yum install screen
部分输出是：
rabbitmq_rabbitmq-server 5.2 kB/s | 1.8 kB 00:00
rabbitmq_rabbitmq-server-source 3.4 kB/s | 951 B 00:00
每当我使用时，我都会看到这两行yum install，每次使用都会提到 RabbitMQ，yum install就好像有一些奇怪的缓存失败问题一样，这让我感到不安。
我也看到了这个：
[/usr/lib/tmpfiles.d/rabbitmq-server.conf:1] Line references path below legacy directory /var/run/, updating /var/run/rabbitmq → /run/rabbitmq; please update the tmpfiles.d/ drop-in file accordingly.
