RabbitMQ management interface returns error after hard reboot.

[al...@seevibes.com]

Hello, 

We are using rabbitMQ as our main messaging service. It is running on one single server. 

We rebooted the server to recover from a crash and since then, the rabbitMQ management interface is not working anymore. 

Here is the error we get when trying to display the 'homepage':

Got response code 500 with body {"error":"Internal Server Error","reason":"{error,\n {exit,\n {{function_clause,\n [{rabbit_mgmt_stats_tables,index,\n [#Ref<0.2031429047.360841220.110367>],\n [{file,\"src/rabbit_mgmt_stats_tables.erl\"},{line,154}]},\n {rabbit_mgmt_stats,blank,0,\n [{file,\"src/rabbit_mgmt_stats.erl\"},{line,318}]},\n {rabbit_mgmt_stats,sum,1,\n [{file,\"src/rabbit_mgmt_stats.erl\"},{line,133}]},\n {rabbit_mgmt_db,overview_sum,2,\n [{file,\"src/rabbit_mgmt_db.erl\"},{line,635}]},\n {rabbit_mgmt_db,'-handle_call/3-lc$^1/1-0-',2,\n [{file,\"src/rabbit_mgmt_db.erl\"},{line,247}]},\n {rabbit_mgmt_db,handle_call,3,\n [{file,\"src/rabbit_mgmt_db.erl\"},{line,247}]},\n {gen_server2,handle_msg,2,\n [{file,\"src/gen_server2.erl\"},{line,1028}]},\n {proc_lib,wake_up,3,[{file,\"proc_lib.erl\"},{line,257}]}]},\n {gen_server2,call,\n [{global,rabbit_mgmt_db},\n {get_overview,all,{no_range,no_range,no_range,no_range}},\n infinity]}},\n [{gen_server2,call,3,[{file,\"src/gen_server2.erl\"},{line,340}]},\n {rabbit_misc,with_exit_handler,2,\n [{file,\"src/rabbit_misc.erl\"},{line,504}]},\n {rabbit_mgmt_wm_overview,to_json,2,\n [{file,\"src/rabbit_mgmt_wm_overview.erl\"},{line,65}]},\n {webmachine_resource,resource_call,3,\n [{file,\"src/webmachine_resource.erl\"},{line,186}]},\n {webmachine_resource,do,3,\n [{file,\"src/webmachine_resource.erl\"},{line,142}]},\n {webmachine_decision_core,resource_call,1,\n [{file,\"src/webmachine_decision_core.erl\"},{line,48}]},\n {webmachine_decision_core,decision,1,\n [{file,\"src/webmachine_decision_core.erl\"},{line,558}]},\n {webmachine_decision_core,handle_request,2,\n [{file,\"src/webmachine_decision_core.erl\"},{line,33}]}]}}\n"}

We get the same error in the logs:

=INFO REPORT==== 26-May-2017::15:32:51 ===
closing AMQP connection <0.10655.0> (xxxxxxxx)


=INFO REPORT==== 26-May-2017::15:34:03 ===
accepting AMQP connection <0.28036.0> (xxxxxxxx)


=INFO REPORT==== 26-May-2017::15:34:03 ===
closing AMQP connection <0.28036.0> (xxxxxxx)


=INFO REPORT==== 26-May-2017::15:34:16 ===
closing AMQP connection <0.22270.0> (xxxxxxxx)


=ERROR REPORT==== 26-May-2017::15:35:22 ===
** Generic server rabbit_mgmt_db terminating
** Last message in was {get_overview,all,
                                     {no_range,no_range,no_range,no_range}}
** When Server state == {state,5000}
** Reason for termination ==
** {function_clause,
       [{rabbit_mgmt_stats_tables,index,
            [#Ref<0.2031429047.361627651.219906>],
            [{file,"src/rabbit_mgmt_stats_tables.erl"},{line,154}]},
        {rabbit_mgmt_stats,blank,0,
            [{file,"src/rabbit_mgmt_stats.erl"},{line,318}]},
        {rabbit_mgmt_stats,sum,1,
            [{file,"src/rabbit_mgmt_stats.erl"},{line,133}]},
        {rabbit_mgmt_db,overview_sum,2,
            [{file,"src/rabbit_mgmt_db.erl"},{line,635}]},
        {rabbit_mgmt_db,'-handle_call/3-lc$^1/1-0-',2,
            [{file,"src/rabbit_mgmt_db.erl"},{line,247}]},
        {rabbit_mgmt_db,handle_call,3,
            [{file,"src/rabbit_mgmt_db.erl"},{line,247}]},
        {gen_server2,handle_msg,2,[{file,"src/gen_server2.erl"},{line,1028}]},
        {proc_lib,wake_up,3,[{file,"proc_lib.erl"},{line,257}]}]}


=ERROR REPORT==== 26-May-2017::15:35:22 ===
webmachine error: path="/api/overview"
{error,
    {exit,
        {{function_clause,
             [{rabbit_mgmt_stats_tables,index,
                  [#Ref<0.2031429047.361627651.219906>],
                  [{file,"src/rabbit_mgmt_stats_tables.erl"},{line,154}]},
              {rabbit_mgmt_stats,blank,0,
                  [{file,"src/rabbit_mgmt_stats.erl"},{line,318}]},
              {rabbit_mgmt_stats,sum,1,
                  [{file,"src/rabbit_mgmt_stats.erl"},{line,133}]},
              {rabbit_mgmt_db,overview_sum,2,
                  [{file,"src/rabbit_mgmt_db.erl"},{line,635}]},
              {rabbit_mgmt_db,'-handle_call/3-lc$^1/1-0-',2,

    [{file,"src/rabbit_mgmt_db.erl"},{line,247}]},
              {rabbit_mgmt_db,handle_call,3,
                  [{file,"src/rabbit_mgmt_db.erl"},{line,247}]},
              {gen_server2,handle_msg,2,
                  [{file,"src/gen_server2.erl"},{line,1028}]},
              {proc_lib,wake_up,3,[{file,"proc_lib.erl"},{line,257}]}]},
         {gen_server2,call,
             [{global,rabbit_mgmt_db},
              {get_overview,all,{no_range,no_range,no_range,no_range}},
              infinity]}},
        [{gen_server2,call,3,[{file,"src/gen_server2.erl"},{line,340}]},
         {rabbit_misc,with_exit_handler,2,
             [{file,"src/rabbit_misc.erl"},{line,504}]},
         {rabbit_mgmt_wm_overview,to_json,2,
             [{file,"src/rabbit_mgmt_wm_overview.erl"},{line,65}]},
         {webmachine_resource,resource_call,3,
             [{file,"src/webmachine_resource.erl"},{line,186}]},
         {webmachine_resource,do,3,
             [{file,"src/webmachine_resource.erl"},{line,142}]},
         {webmachine_decision_core,resource_call,1,
             [{file,"src/webmachine_decision_core.erl"},{line,48}]},
         {webmachine_decision_core,decision,1,
             [{file,"src/webmachine_decision_core.erl"},{line,558}]},
         {webmachine_decision_core,handle_request,2,
             [{file,"src/webmachine_decision_core.erl"},{line,33}]}]}}


=INFO REPORT==== 26-May-2017::15:35:22 ===
Statistics database started.

rabbitmq environement:

Application environment of node rabbit@juan ...
[{amqp_client,[{prefer_ipv6,false},{ssl_options,[]}]},
 {asn1,[]},
 {compiler,[]},
 {crypto,[{fips_mode,false}]},
 {inets,[]},
 {kernel,
     [{error_logger,tty},
      {inet_default_connect_options,[{nodelay,true}]},
      {inet_dist_listen_max,25672},
      {inet_dist_listen_min,25672}]},
 {mnesia,[{dir,"/var/lib/rabbitmq/mnesia/rabbit@juan"}]},
 {mochiweb,[]},
 {os_mon,
     [{start_cpu_sup,false},
      {start_disksup,false},
      {start_memsup,false},
      {start_os_sup,false}]},
 {public_key,[]},
 {rabbit,
     [{auth_backends,[rabbit_auth_backend_internal]},
      {auth_mechanisms,['PLAIN','AMQPLAIN']},
      {backing_queue_module,rabbit_priority_queue},
      {channel_max,0},
      {channel_operation_timeout,15000},
      {cluster_keepalive_interval,10000},
      {cluster_nodes,{[],disc}},
      {cluster_partition_handling,ignore},
      {collect_statistics,fine},
      {collect_statistics_interval,5000},
      {credit_flow_default_credit,{200,50}},
      {default_permissions,[<<".*">>,<<".*">>,<<".*">>]},
      {default_user,<<"guest">>},
      {default_user_tags,[administrator]},
      {default_vhost,<<"/">>},
      {delegate_count,16},
      {disk_free_limit,50000000},
      {enabled_plugins_file,"/etc/rabbitmq/enabled_plugins"},
      {error_logger,{file,"/var/log/rabbitmq/rab...@juan.log"}},
      {fhc_read_buffering,false},
      {fhc_write_buffering,true},
      {frame_max,131072},
      {halt_on_upgrade_failure,true},
      {handshake_timeout,10000},
      {heartbeat,60},
      {hipe_compile,false},
      {hipe_modules,
          [rabbit_reader,rabbit_channel,gen_server2,rabbit_exchange,
           rabbit_command_assembler,rabbit_framing_amqp_0_9_1,rabbit_basic,
           rabbit_event,lists,queue,priority_queue,rabbit_router,rabbit_trace,
           rabbit_misc,rabbit_binary_parser,rabbit_exchange_type_direct,
           rabbit_guid,rabbit_net,rabbit_amqqueue_process,
           rabbit_variable_queue,rabbit_binary_generator,rabbit_writer,
           delegate,gb_sets,lqueue,sets,orddict,rabbit_amqqueue,
           rabbit_limiter,gb_trees,rabbit_queue_index,
           rabbit_exchange_decorator,gen,dict,ordsets,file_handle_cache,
           rabbit_msg_store,array,rabbit_msg_store_ets_index,rabbit_msg_file,
           rabbit_exchange_type_fanout,rabbit_exchange_type_topic,mnesia,
           mnesia_lib,rpc,mnesia_tm,qlc,sofs,proplists,credit_flow,pmon,
           ssl_connection,tls_connection,ssl_record,tls_record,gen_fsm,ssl]},
      {log_levels,[{connection,info}]},
      {loopback_users,[<<"guest">>]},
      {memory_monitor_interval,2500},
      {mirroring_flow_control,true},
      {mirroring_sync_batch_size,4096},
      {mnesia_table_loading_timeout,30000},
      {msg_store_credit_disc_bound,{2000,500}},
      {msg_store_file_size_limit,16777216},
      {msg_store_index_module,rabbit_msg_store_ets_index},
      {msg_store_io_batch_size,2048},
      {num_ssl_acceptors,1},
      {num_tcp_acceptors,10},
      {password_hashing_module,rabbit_password_hashing_sha256},
      {plugins_dir,"/usr/lib/rabbitmq/lib/rabbitmq_server-3.6.2/plugins"},
      {plugins_expand_dir,
          "/var/lib/rabbitmq/mnesia/rabbit@juan-plugins-expand"},
      {queue_index_embed_msgs_below,4096},
      {queue_index_max_journal_entries,32768},
      {reverse_dns_lookups,false},
      {sasl_error_logger,{file,"/var/log/rabbitmq/rab...@juan-sasl.log"}},
      {server_properties,[]},
      {ssl_allow_poodle_attack,false},
      {ssl_apps,[asn1,crypto,public_key,ssl]},
      {ssl_cert_login_from,distinguished_name},
      {ssl_handshake_timeout,5000},
      {ssl_listeners,[]},
      {ssl_options,[]},
      {tcp_listen_options,
          [{backlog,128},
           {nodelay,true},
           {linger,{true,0}},
           {exit_on_close,false}]},
      {tcp_listeners,[5672]},
      {trace_vhosts,[]},
      {vm_memory_high_watermark,0.4},
      {vm_memory_high_watermark_paging_ratio,0.5}]},
 {rabbit_common,[]},
 {rabbitmq_consistent_hash_exchange,[]},
 {rabbitmq_federation,[{pgroup_name_cluster_id,false}]},
 {rabbitmq_management,
     [{cors_allow_origins,[]},
      {cors_max_age,1800},
      {http_log_dir,none},
      {listener,[{port,15672}]},
      {load_definitions,none},
      {process_stats_gc_timeout,300000},
      {rates_mode,basic},
      {sample_retention_policies,
          [{global,[{605,5},{3660,60},{29400,600},{86400,1800}]},
           {basic,[{605,5},{3600,60}]},
           {detailed,[{10,5}]}]}]},
 {rabbitmq_management_agent,[]},
 {rabbitmq_shovel,
     [{defaults,
          [{prefetch_count,1000},
           {ack_mode,on_confirm},
           {publish_fields,[]},
           {publish_properties,[]},
           {reconnect_delay,5}]}]},
 {rabbitmq_web_dispatch,[]},
 {ranch,[]},
 {sasl,[{errlog_type,error},{sasl_error_logger,false}]},
 {ssl,[]},
 {stdlib,[]},
 {syntax_tools,[]},
 {webmachine,[{error_handler,rabbit_webmachine_error_handler}]},
 {xmerl,[]}]

rabbitmq status:

Status of node rabbit@juan ...
[{pid,25850},
 {running_applications,
     [{rabbitmq_management,"RabbitMQ Management Console","3.6.2"},
      {rabbitmq_web_dispatch,"RabbitMQ Web Dispatcher","3.6.2"},
      {webmachine,"webmachine","1.10.3"},
      {mochiweb,"MochiMedia Web Server","2.13.1"},
      {inets,"INETS  CXC 138 49","6.3.9"},
      {rabbitmq_management_agent,"RabbitMQ Management Agent","3.6.2"},
      {ssl,"Erlang/OTP SSL application","8.2"},
      {public_key,"Public key infrastructure","1.4.1"},
      {asn1,"The Erlang ASN1 compiler version 5.0","5.0"},
      {crypto,"CRYPTO","4.0"},
      {syntax_tools,"Syntax tools","2.1.2"},
      {compiler,"ERTS  CXC 138 10","7.1"},
      {rabbitmq_shovel,"Data Shovel for RabbitMQ","3.6.2"},
      {rabbitmq_consistent_hash_exchange,"Consistent Hash Exchange Type",
          "3.6.2"},
      {rabbitmq_federation,"RabbitMQ Federation","3.6.2"},
      {rabbit,"RabbitMQ","3.6.2"},
      {os_mon,"CPO  CXC 138 46","2.4.2"},
      {amqp_client,"RabbitMQ AMQP Client","3.6.2"},
      {xmerl,"XML parser","1.3.14"},
      {mnesia,"MNESIA  CXC 138 12","4.15"},
      {ranch,"Socket acceptor pool for TCP protocols.","1.2.1"},
      {rabbit_common,[],"3.6.2"},
      {sasl,"SASL  CXC 138 11","3.0.4"},
      {stdlib,"ERTS  CXC 138 10","3.4"},
      {kernel,"ERTS  CXC 138 10","5.3"}]},
 {os,{unix,linux}},
 {erlang_version,
     "Erlang/OTP 20 [erts-9.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:64] [hipe] [kernel-poll:true]\n"},
 {memory,
     [{total,2219469888},
      {connection_readers,868104},
      {connection_writers,312152},
      {connection_channels,697960},
      {connection_other,1549800},
      {queue_procs,727936208},
      {queue_slave_procs,0},
      {plugins,195912},
      {other_proc,20561768},
      {mnesia,1053904},
      {mgmt_db,2155336},
      {msg_index,165472},
      {other_ets,1923784},
      {binary,1421806352},
      {code,24959330},
      {atom,1041593},
      {other_system,14242213}]},
 {alarms,[]},
 {listeners,[{clustering,25672,"::"},{amqp,5672,"::"}]},
 {vm_memory_high_watermark,0.4},
 {vm_memory_limit,6718816256},
 {disk_free_limit,50000000},
 {disk_free,201476845568},
 {file_descriptors,
     [{total_limit,65436},
      {total_used,68},
      {sockets_limit,58890},
      {sockets_used,56}]},
 {processes,[{limit,1048576},{used,1208}]},
 {run_queue,0},
 {uptime,338},
 {kernel,{net_ticktime,60}}]

Let me know if there is information missing..

[al...@seevibes.com]

Update: 

We found that our erlang version is different from staging to production servers:

staging: {erlang_version, "Erlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:8:8] [async-threads:128] [kernel-poll:true]\n"}

production: {erlang_version, "Erlang/OTP 20 [erts-9.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:64] [hipe] [kernel-poll:true]\n"}

Is there an easy way to downgrade our Erlang version? The server OS is Ubuntu 14.04.5 and our packages are managed remotely by puppet (legacy).

 

[Michael Klishin]

Erlang/OTP 20 is not GA yet so no released RabbitMQ version supports it. In fact, while testing
against OTP 20 we had to submit a PR or two to the OTP team because of unintentional breaking
changes that uncovered.

Downgrading should be as easy as

 * Purging the package you have
 * Installing 19.3 (or whatever version you have) from Erlang Solutions

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[al...@seevibes.com]

I think it was exactly the problem, we downgraded the erlang version to 19.3 then 18.3. The interface is working again but the messages sent are now in 'korean'. 

Does rabbitmq have to be resintalled after downgrading erlang?

Here is a sample of our message logs:

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2017-05-26 16:12:20.405775500 ▒├ ┘▒┴▒.┌▒┼±.⎼␊°┌␊␌├.M␊├␤⎺␍.␋┼┴⎺┐␊(M␊├␤⎺␍.┘▒┴▒:606) ·[┼▒:1.7.0▮131]
2017-05-26 16:12:20.405776500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.␌⎺└⎻⎺┼␊┼├.␉␊▒┼.M␊├␤⎺␍I┼°⎺.␋┼┴⎺┐␊(M␊├␤⎺␍I┼°⎺.┘▒┴▒:408) ·[␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
2017-05-26 16:12:20.405779500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.␌⎺└⎻⎺┼␊┼├.␉␊▒┼.M␊├␤⎺␍I┼°⎺$1.␍⎺P⎼⎺␌␊␊␍(M␊├␤⎺␍I┼°⎺.┘▒┴▒:279) ·[␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
2017-05-26 16:12:20.405780500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.␌⎺└⎻⎺┼␊┼├.␉␊▒┼.M␊├␤⎺␍I┼°⎺$1.⎻⎼⎺␌␊␊␍(M␊├␤⎺␍I┼°⎺.┘▒┴▒:252) ·[␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
2017-05-26 16:12:20.405780500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.␌⎺└⎻⎺┼␊┼├.␉␊▒┼.B␊▒┼P⎼⎺␌␊⎽⎽⎺⎼.⎻⎼⎺␌␊⎽⎽(B␊▒┼P⎼⎺␌␊⎽⎽⎺⎼.┘▒┴▒:167) ·[␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
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2017-05-26 16:12:20.405784500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.⎻⎼⎺␌␊⎽⎽⎺⎼.C▒└␊┌I┼├␊⎼┼▒┌P⎼⎺␌␊⎽⎽⎺⎼.⎻⎼⎺␌␊⎽⎽(C▒└␊┌I┼├␊⎼┼▒┌P⎼⎺␌␊⎽⎽⎺⎼.┘▒┴▒:191) [␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
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2017-05-26 16:12:20.405795500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.⎻⎼⎺␌␊⎽⎽⎺⎼.D␊┌␊±▒├␊A⎽≤┼␌P⎼⎺␌␊⎽⎽⎺⎼.⎻⎼⎺␌␊⎽⎽(D␊┌␊±▒├␊A⎽≤┼␌P⎼⎺␌␊⎽⎽⎺⎼.┘▒┴▒:87) [␌▒└␊┌-␌⎺⎼␊-2.14.2.┘▒⎼:2.14.2]
2017-05-26 16:12:20.405795500 ▒├ ⎺⎼±.▒⎻▒␌␤␊.␌▒└␊┌.␌⎺└⎻⎺┼␊┼├.⎼▒␉␉␋├└─.R▒␉␉␋├MQC⎺┼⎽┤└␊⎼$R▒␉␉␋├C⎺┼⎽┤└␊⎼.␤▒┼␍┌␊D␊┌␋┴␊⎼≤(R▒␉␉␋├MQC⎺┼⎽┤└␊⎼.┘▒┴▒:189) [␌▒└␊┌-⎼▒␉␉␋├└─-2.14.2.┘▒⎼:2.14.2]
2017-05-26 16:12:20.405796500 ▒├ ␌⎺└.⎼▒␉␉␋├└─.␌┌␋␊┼├.␋└⎻┌.C⎺┼⎽┤└␊⎼D␋⎽⎻▒├␌␤␊⎼$5.⎼┤┼(C⎺┼⎽┤└␊⎼D␋⎽⎻▒├␌␤␊⎼.┘▒┴▒:140) [▒└─⎻-␌┌␋␊┼├-3.3.4.┘▒⎼:┼▒]
2017-05-26 16:12:20.405799500 ▒├ ␌⎺└.⎼▒␉␉␋├└─.␌┌␋␊┼├.␋└⎻┌.C⎺┼⎽┤└␊⎼W⎺⎼┐S␊⎼┴␋␌␊$W⎺⎼┐P⎺⎺┌R┤┼┼▒␉┌␊.⎼┤┼(C⎺┼⎽┤└␊⎼W⎺⎼┐S␊⎼┴␋␌␊.┘▒┴▒:85) [▒└─⎻-␌┌␋␊┼├-3.3.4.┘▒⎼:┼▒]
2017-05-26 16:12:20.405799500 ▒├ ┘▒┴▒.┤├␋┌.␌⎺┼␌┤⎼⎼␊┼├.T␤⎼␊▒␍P⎺⎺┌E│␊␌┤├⎺⎼.⎼┤┼W⎺⎼┐␊⎼(T␤⎼␊▒␍P⎺⎺┌E│␊␌┤├⎺⎼.┘▒┴▒:1145) [┼▒:1.7.0▮131]
2017-05-26 16:12:20.405800500 ▒├ ┘▒┴▒.┤├␋┌.␌⎺┼␌┤⎼⎼␊┼├.T␤⎼␊▒␍P⎺⎺┌E│␊␌┤├⎺⎼$W⎺⎼┐␊⎼.⎼┤┼(T␤⎼␊▒␍P⎺⎺┌E│␊␌┤├⎺⎼.┘▒┴▒:615) [┼▒:1.7.0▮131]
2017-05-26 16:12:20.405802500 ▒├ ┘▒┴▒.┌▒┼±.T␤⎼␊▒␍.⎼┤┼(T␤⎼␊▒␍.┘▒┴▒:745) [┼▒:1.7.0▮131]

[Michael Klishin]

I don't see why RabbitMQ would have to be reinstalled. I haven't used OTP 20, though.

Not sure what the "message logs" are, RabbitMQ does not log messages unless rabbitmq-tracing is used.
If these are you application's logs I'd seriously consider investigating how the locales are configured (and perhaps regenerate them).

On 26 May 2017 at 21:34:38, al...@seevibes.com (al...@seevibes.com) wrote:
>

[lon...@beeketing.net]

Hello,

I had this error, after down grading Erlang version from 20.1 to 18.3 it works (could access rabbit management web console).

rabbitmq environement:

      {sasl_error_logger,{file,"/var/log/rabbitmq/rabbit@juan-sasl.log"}},

[Michael Klishin]

Erlang 18.x is not supported by any currently supported RabbitMQ version series and has known bugs that

are catastrophic to RabbitMQ [1]. Consider upgrading both RabbitMQ and Erlang [2][3] instead of

recommending 18.x.

1. https://www.rabbitmq.com/which-erlang.html

2. https://www.rabbitmq.com/upgrade.html

3. https://www.rabbitmq.com/changelog.html

rabbitmq environement:

      {sasl_error_logger,{file,"/var/log/rabbitmq/rab...@juan-sasl.log"}},

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