RabbitMQ單機多例項配置
由於某些因素的限制,有時候你不得不在一臺機器上去搭建一個rabbitmq叢集,當然這種叢集只適合自己玩玩,驗證下結論,這個有點類似zookeeper的單機版。真實生成環境還是要配成多機叢集的。有關怎麼配置多機叢集的可以參考其他的資料,這裡主要論述如何在單機中配置多個rabbitmq例項。
前提
配置的前提是你的rabbitmq可以執行起來,比如”ps aux|grep rabbitmq”你能看到相關程序,又比如執行“rabbitmqctl status”你可以看到類似如下資訊,而不報錯:
[[email protected] rabbitmq]# rabbitmqctl status
Status of node '[email protected]' ...
[{pid,13014},
{running_applications,[{rabbit,"RabbitMQ","3.4.0"},
{mnesia,"MNESIA CXC 138 12","4.14.1"},
{os_mon,"CPO CXC 138 46","2.4.1"},
{xmerl,"XML parser","1.3.12"},
{sasl,"SASL CXC 138 11" ,"3.0.1"},
{stdlib,"ERTS CXC 138 10","3.1"},
{kernel,"ERTS CXC 138 10","5.1"}]},
{os,{unix,linux}},
{erlang_version,"Erlang/OTP 19 [erts-8.1] [source] [64-bit] [smp:4:4] [async-threads:30] [hipe] [kernel-poll:true]\n"},
{memory,[{total,37276536},
{connection_readers,0 },
{connection_writers,0},
{connection_channels,0},
{connection_other,2832},
{queue_procs,2832},
{queue_slave_procs,0},
{plugins,0},
{other_proc,13331064},
{mnesia,66248},
{mgmt_db,0},
{msg_index,41184},
{other_ets,778528},
{binary,23152},
{code,14637029},
{atom,654241},
{other_system,7739426}]},
{alarms,[]},
{listeners,[{clustering,25672,"::"},{amqp,5672,"::"}]},
{vm_memory_high_watermark,0.4},
{vm_memory_limit,3301929779},
{disk_free_limit,50000000},
{disk_free,37108654080},
{file_descriptors,[{total_limit,924},
{total_used,3},
{sockets_limit,829},
{sockets_used,1}]},
{processes,[{limit,1048576},{used,126}]},
{run_queue,0},
{uptime,2143}]
為了簡單化,這裡也要保證rabbitmq的plugin沒有開啟(因為開啟之後要佔用一些埠,多例項配置起來會更加複雜,這裡簡單問題簡化說明)。
情景
假設有三個rabbitmq節點,分別為rabbit1, rabbit2和rabbit3
主要開啟命令如下:
RABBITMQ_NODE_PORT=5672 RABBITMQ_NODENAME=rabbit1 rabbitmq-server -detached
RABBITMQ_NODE_PORT=5673 RABBITMQ_NODENAME=rabbit2 rabbitmq-server -detached
RABBITMQ_NODE_PORT=5674 RABBITMQ_NODENAME=rabbit3 rabbitmq-server -detached
結束命令如下:
rabbitmqctl -n rabbit1 stop
rabbitmqctl -n rabbit2 stop
rabbitmqctl -n rabbit3 stop
rabbit1
[[email protected] rabbitmq]# rabbitmqctl -n rabbit1 stop_app
Stopping node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit1 reset
Resetting node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit1 cluster
Clustering node '[email protected]' with [] ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit1 start_app
Starting node '[email protected]' ...
...done.
TIPS
有些版本(比如3.4.0)在第一個節點(主節點)執行“rabbitmqctl -n rabbit1 cluster” 時會遇到:
Error: could not recognise command
的錯誤,可以不執行“rabbitmqctl -n rabbit1 cluster”這句。然後在從節點執行:
rabbitmqctl -n rabbit2 join_cluster [email protected]`hostname -s`
這一句。
主要原因是:有些版本不識別cluster這個命令
rabbit2
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 stop_app
Stopping node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 reset
Resetting node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 cluster [email protected]`hostname -s`
Clustering node '[email protected]' with ['[email protected]'] ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 start_app
Starting node '[email protected]' ...
...done.
TIPS
如果略去“rabbitmqctl -n rabbit2 reset”這一句,可能會報錯:
Error: {ok,already_member}
檢視cluster資訊
[[email protected] rabbitmq]# rabbitmqctl -n rabbit1 cluster_status
Cluster status of node '[email protected]' ...
[{nodes,[{disc,['[email protected]']},
{ram,['[email protected]']}]},
{running_nodes,['[email protected]','[email protected]']}]
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 cluster_status
Cluster status of node '[email protected]' ...
[{nodes,[{disc,['[email protected]']},
{ram,['[email protected]']}]},
{running_nodes,['[email protected]','[email protected]']}]
...done.
加入節點rabbit3
[[email protected] rabbitmq]# RABBITMQ_NODE_PORT=5674 RABBITMQ_NODENAME=rabbit3 rabbitmq-server -detached
Activating RabbitMQ plugins ...
0 plugins activated:
[[email protected] rabbitmq]# rabbitmqctl -n rabbit3 stop_app
Stopping node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit3 reset
Resetting node '[email protected]' ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit3 cluster [email protected]`hostname -s`
Clustering node '[email protected]' with ['[email protected]'] ...
...done.
[[email protected] rabbitmq]# rabbitmqctl -n rabbit3 start_app
Starting node '[email protected]' ...
...done.
最終檢視叢集狀態
[[email protected] rabbitmq]# rabbitmqctl -n rabbit3 cluster_status
Cluster status of node '[email protected]' ...
[{nodes,[{disc,['[email protected]']},
{ram,['[email protected]','[email protected]']}]},
{running_nodes,['[email protected]','[email protected]',
'[email protected]']}]
...done.
TIPS
有可能遇到這樣的情況:
[[email protected] rabbitmq]# rabbitmqctl status -n rabbit2
Status of node '[email protected]' ...
Error: {badarith,[{rabbit_vm,bytes,1,[]},
{rabbit_vm,'-mnesia_memory/0-lc$^0/1-0-',1,[]},
{rabbit_vm,mnesia_memory,0,[]},
{rabbit_vm,memory,0,[]},
{rabbit,status,0,[]},
{rpc,'-handle_call_call/6-fun-0-',5,
[{file,"rpc.erl"},{line,187}]}]}
有一種解決版本是將“/var/lib/rabbitmq/mnesia/”目錄下的所有內容刪掉(rm -rf *),然後重新啟動再配置。
And….
很多時候也會遇到這樣的情況:
[[email protected] rabbitmq]# rabbitmqctl -n rabbit2 status
Status of node '[email protected]' ...
Error: unable to connect to node '[email protected]': nodedown
diagnostics:
- nodes and their ports on hiddenzhu-8drdc: [{rabbit1,44494},
{rabbitmqctl2271,60458}]
- current node: '[email protected]'
- current node home dir: /root
- current node cookie hash: VCwbL3S9/ydrGgVsrLjVkA==
這說明rabbitmq節點並未啟動起來,需要進一步檢視排除異常。
End…
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