report an error when building a rocketmq stand-alone environment.
Problem encountered: using command
nohup sh mqnamesrv &
The following error occurred
java. net. UnknownHostException: hadoop03: hadoop03: unknown error
at java. net. InetAddress. getLocalHost(InetAddress.java:1505)
at org. apache. rocketmq. common. BrokerConfig. localHostName(BrokerConfig.java:201)
at org. apache. rocketmq. common. BrokerConfig.& lt; init> (BrokerConfig.java:39)
at org. apache. rocketmq. broker. BrokerStartup. createBrokerController(BrokerStartup.java:101)
at org. apache. rocketmq. broker. BrokerStartup. main(BrokerStartup.java:56)
Caused by: java. net. UnknownHostException: hadoop03: unknown error
at java. net. Inet4AddressImpl. lookupAllHostAddr(Native Method)
at java. net. InetAddress$2. lookupAllHostAddr(InetAddress.java:928)
at java. net. InetAddress. getAddressesFromNameService(InetAddress.java:1323)
at java. net. InetAddress. getLocalHost(InetAddress.java:1500)
… 4 common frames omitted
This is because the IP address corresponding to your host name cannot be found during startup. Just add the above configuration in /etc/hosts
Solution:
Operate according to the following command
Add the mapping marked in red to the file. Note: permission problems may occur during editing, and the root account needs to be switched
:wq! Save exit
Use the JPS command to check the process to see if NamesrvStartup has been started. If it is about closing it
sh mqshutdown namesrv
Start mqnamesrv again
nohup sh mqnamesrv &
Check the log and solve the problem
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