老师好，我用的是阿里云服务器，hosts已经配了hadoop000的映射，并且已配置了java_hom，在运行./start-dfs.sh时，报下面错误

[hadoop@hadoop000 sbin]$ ./start-dfs.sh
Incorrect configuration: namenode address dfs.namenode.servicerpc-address or dfs.namenode.rpc-address is not configured.
Starting namenodes on [2020-08-16 19:10:33,261 WARN  [main] util.NativeCodeLoader (NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable]
Unable: ssh: Could not resolve hostname unable: Name or service not known
your: ssh: Could not resolve hostname your: Name or service not known
platform...: ssh: Could not resolve hostname platform...: Name or service not known
WARN: ssh: Could not resolve hostname warn: Name or service not known
2020-08-16: ssh: Could not resolve hostname 2020-08-16: Name or service not known
to: ssh: Could not resolve hostname to: Name or service not known
load: ssh: Could not resolve hostname load: Name or service not known
where: ssh: Could not resolve hostname where: Name or service not known
using: ssh: Could not resolve hostname using: Name or service not known
[main]: ssh: Could not resolve hostname [main]: Name or service not known
applicable: ssh: Could not resolve hostname applicable: Name or service not known
19:10:33,261: ssh: Could not resolve hostname 19:10:33,261: Name or service not known
native-hadoop: ssh: Could not resolve hostname native-hadoop: Name or service not known
builtin-java: ssh: Could not resolve hostname builtin-java: Name or service not known
util.NativeCodeLoader: ssh: Could not resolve hostname util.nativecodeloader: Name or service not known
classes: ssh: Could not resolve hostname classes: Name or service not known
for: ssh: Could not resolve hostname for: Name or service not known
library: ssh: Could not resolve hostname library: Name or service not known
-: ssh: Could not resolve hostname -: Name or service not known
(NativeCodeLoader.java:<clinit>(62)): ssh: Could not resolve hostname (nativecodeloader.java:<clinit>(62)): Name or service not known
cat: /home/hadoop/app/hadoop-2.6.0-cdh5.16.2/slaves: No such file or directory
Starting secondary namenodes [2020-08-16 19:10:34,187 WARN  [main] util.NativeCodeLoader (NativeCodeLoader.java:<clinit>(62)) - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
0.0.0.0]
platform...: ssh: Could not resolve hostname platform...: Name or service not known
to: ssh: Could not resolve hostname to: Name or service not known
2020-08-16: ssh: Could not resolve hostname 2020-08-16: Name or service not known
using: ssh: Could not resolve hostname using: Name or service not known
WARN: ssh: Could not resolve hostname warn: Name or service not known
native-hadoop: ssh: Could not resolve hostname native-hadoop: Name or service not known
Unable: ssh: Could not resolve hostname unable: Name or service not known
-: ssh: Could not resolve hostname -: Name or service not known
for: ssh: Could not resolve hostname for: Name or service not known
library: ssh: Could not resolve hostname library: Name or service not known
[main]: ssh: Could not resolve hostname [main]: Name or service not known
(NativeCodeLoader.java:<clinit>(62)): ssh: Could not resolve hostname (nativecodeloader.java:<clinit>(62)): Name or service not known
load: ssh: Could not resolve hostname load: Name or service not known
your: ssh: Could not resolve hostname your: Name or service not known
builtin-java: ssh: Could not resolve hostname builtin-java: Name or service not known
util.NativeCodeLoader: ssh: Could not resolve hostname util.nativecodeloader: Name or service not known
classes: ssh: Could not resolve hostname classes: Name or service not known
applicable: ssh: Could not resolve hostname applicable: Name or service not known
where: ssh: Could not resolve hostname where: Name or service not known
19:10:34,187: ssh: Could not resolve hostname 19:10:34,187: Name or service not known
0.0.0.0: Error: JAVA_HOME is not set and could not be found.